/* roulang page: index */
:root {
  --bg-primary: #070D1A;
  --bg-secondary: #0B1420;
  --bg-panel: rgba(255,255,255,0.06);
  --bg-card: rgba(13,20,36,0.82);
  --bg-input: #0E1830;
  --primary: #2E7CF6;
  --accent: #00D4FF;
  --gold: #F0B54A;
  --success: #34D399;
  --error: #F87171;
  --warning: #FBBF24;
  --text-primary: #EAF0F8;
  --text-secondary: #8FA3BF;
  --text-muted: #566A85;
  --border-light: rgba(255,255,255,0.08);
  --border: rgba(255,255,255,0.12);
  --border-hover: rgba(255,255,255,0.25);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 8px 32px rgba(0,0,0,0.35);
  --shadow-glow: 0 0 24px rgba(0,212,255,0.15);
  --gradient-primary: linear-gradient(135deg,#2E7CF6 0%,#00D4FF 100%);
  --font-family: "PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --space-section: 110px;
  --space-section-md: 88px;
  --space-section-sm: 60px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-family);background:var(--bg-primary);color:var(--text-primary);line-height:1.75;font-size:15px;overflow-x:hidden}
a{color:inherit;text-decoration:none;transition:color .25s ease}
img{max-width:100%;display:block}
ul,ol{list-style:none}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:none;outline:none}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:var(--space-section) 0;position:relative}
.section-title{font-size:clamp(28px,4vw,36px);font-weight:700;line-height:1.3;letter-spacing:-.5px;text-align:center;margin-bottom:18px}
.section-sub{text-align:center;color:var(--text-secondary);font-size:15px;max-width:620px;margin:0 auto 42px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 26px;border-radius:var(--radius-md);font-weight:600;font-size:15px;cursor:pointer;transition:all .3s ease;white-space:nowrap}
.btn-lg{height:52px;padding:0 38px;font-size:16px}
.btn-sm{height:36px;padding:0 18px;font-size:13px}
.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:0 2px 18px rgba(0,180,255,.28),inset 0 1px 0 rgba(255,255,255,.2)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 26px rgba(0,200,255,.4),inset 0 1px 0 rgba(255,255,255,.25)}
.btn-primary:active{transform:translateY(0);filter:brightness(.9)}
.btn-secondary{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);color:var(--text-primary);backdrop-filter:blur(10px)}
.btn-secondary:hover{border-color:var(--accent);box-shadow:var(--shadow-glow);transform:translateY(-2px)}
.btn-block{width:100%}
.btn:focus-visible,.nav-toggle:focus-visible,.modal-close:focus-visible,.float-btn:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ===== Header Nav ===== */
.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(7,13,26,.82);border-bottom:1px solid rgba(0,212,255,.22);backdrop-filter:blur(18px);transition:background .3s ease,box-shadow .3s ease}
.site-header.scrolled{background:rgba(5,10,20,.92);box-shadow:0 4px 30px rgba(0,0,0,.4)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-icon{width:32px;height:32px;border-radius:8px;background:var(--gradient-primary);box-shadow:0 0 18px rgba(0,180,255,.45);position:relative;flex-shrink:0}
.brand-icon::after{content:"";position:absolute;inset:3px;border-radius:5px;background:rgba(7,13,26,.55);border:1px solid rgba(0,212,255,.4)}
.brand-text{font-weight:800;font-size:17px;letter-spacing:.5px;background:linear-gradient(90deg,#EAF0F8,#9CD8FF);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:34px;margin-left:auto}
.nav-link{position:relative;font-size:15px;font-weight:500;color:#C7D4EA;padding:8px 2px;transition:color .25s}
.nav-link::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--accent);box-shadow:0 0 10px var(--accent);transition:width .3s ease}
.nav-link:hover{color:var(--accent)}
.nav-link:hover::after{width:100%}
.nav-link.active{color:var(--accent)}
.nav-link.active::after{width:100%}
.nav-cta{margin-left:12px;height:40px;padding:0 22px;font-size:14px}
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:44px;height:44px;border-radius:10px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);cursor:pointer;padding:10px}
.nav-toggle span{display:block;height:2px;width:24px;background:var(--text-primary);border-radius:2px;transition:all .3s ease}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Hero ===== */
.hero{position:relative;min-height:82vh;display:flex;align-items:center;justify-content:center;padding:140px 0 90px;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.3;z-index:0}
.hero-overlay{position:absolute;inset:0;background:radial-gradient(ellipse at 50% 40%,rgba(11,27,54,.72) 0%,rgba(7,13,26,.92) 70%),linear-gradient(180deg,rgba(7,13,26,.4) 0%,rgba(7,13,26,.95) 100%);z-index:1}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(0,212,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(0,212,255,.04) 1px,transparent 1px);background-size:52px 52px;z-index:1;pointer-events:none}
.hero::after{content:"";position:absolute;width:620px;height:620px;border-radius:50%;background:rgba(0,180,255,.14);filter:blur(140px);top:-160px;right:-100px;z-index:1;pointer-events:none}
.hero-content{position:relative;z-index:3;text-align:center;max-width:1000px}
.hero h1{font-size:clamp(40px,6vw,56px);font-weight:800;line-height:1.2;letter-spacing:-1px;margin-bottom:20px}
.hero h1 .gradient-text{background:linear-gradient(90deg,#5AB8FF,#00D4FF);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{font-size:17px;color:var(--text-secondary);max-width:640px;margin:0 auto 34px;line-height:1.7}
.hero-actions{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:38px}
.hero-badges{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.trust-badge{display:inline-flex;align-items:center;gap:7px;padding:8px 18px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:30px;font-size:13px;color:var(--text-secondary);backdrop-filter:blur(8px)}
.trust-badge i{font-style:normal;color:var(--accent);font-size:16px}

/* ===== Pain Section ===== */
.pain-section{background:var(--bg-secondary);border-top:1px solid var(--border-light);border-bottom:1px solid var(--border-light)}
.pain-section .section-title{max-width:700px;margin-left:auto;margin-right:auto}
.pain-timeline{position:relative;max-width:720px;margin:0 auto;padding-left:40px}
.pain-timeline::before{content:"";position:absolute;left:16px;top:0;bottom:0;width:2px;background:linear-gradient(180deg,rgba(0,212,255,.5),rgba(0,212,255,.08));box-shadow:0 0 12px rgba(0,212,255,.18)}
.pain-item{position:relative;padding:22px 28px 22px 0;margin-bottom:8px;display:flex;align-items:center;gap:18px;cursor:pointer;transition:all .3s}
.pain-item:hover{transform:translateX(6px)}
.pain-icon{width:34px;height:34px;border-radius:50%;background:rgba(0,212,255,.12);border:1px solid rgba(0,212,255,.3);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;position:absolute;left:-27px;top:50%;transform:translateY(-50%);z-index:1}
.pain-text{font-size:16px;color:#A7B6CC;flex:1;line-height:1.6}
.pain-arrow{color:var(--text-muted);font-size:18px;transition:all .3s}
.pain-item:hover .pain-arrow{color:var(--accent);transform:translateX(4px)}

/* ===== Solution Section ===== */
.solution-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:1020px;margin:0 auto}
.solution-card{position:relative;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:34px;backdrop-filter:blur(16px);box-shadow:var(--shadow-card);transition:all .35s ease;overflow:hidden}
.solution-card::before{content:"";position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(0,212,255,.4),transparent)}
.solution-card:hover{transform:translateY(-4px);border-color:rgba(0,212,255,.28);box-shadow:var(--shadow-card),var(--shadow-glow)}
.step-num{font-size:48px;font-weight:300;color:rgba(255,255,255,.14);line-height:1;display:block;margin-bottom:16px;transition:color .35s,text-shadow .35s}
.solution-card:hover .step-num{color:rgba(0,212,255,.5);text-shadow:0 0 20px rgba(0,212,255,.3)}
.solution-card h3{font-size:clamp(20px,2.4vw,24px);font-weight:600;margin-bottom:10px}
.solution-card p{color:var(--text-secondary);font-size:14.5px;line-height:1.7;margin-bottom:20px}
.card-link{color:#38BDF8;font-size:14px;font-weight:500;display:inline-flex;align-items:center;gap:4px;transition:all .3s}
.card-link:hover{color:var(--accent);text-decoration:underline}
.card-lg{grid-column:span 1}
.card-sm{grid-column:span 1}

/* ===== Stats ===== */
.stats-section{position:relative;background:var(--bg-secondary);padding:80px 0 70px;border-top:1px solid var(--border-light);border-bottom:1px solid var(--border-light);overflow:hidden}
.stats-section::before{content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);width:800px;height:300px;background:radial-gradient(closest-side,rgba(0,140,255,.1),transparent);filter:blur(40px);pointer-events:none}
.stats-header{text-align:center;margin-bottom:50px}
.stats-header h2{font-size:clamp(24px,3.4vw,32px);font-weight:700}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;max-width:1100px;margin:0 auto;position:relative}
.stat-item{text-align:center;padding:20px 10px;position:relative}
.stat-item:not(:last-child)::after{content:"";position:absolute;right:-12px;top:20px;bottom:20px;width:1px;background:rgba(255,255,255,.08)}
.stat-number{font-size:clamp(40px,5vw,56px);font-weight:800;letter-spacing:-1px;background:linear-gradient(135deg,#2E7CF6,#00D4FF);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1.15;margin-bottom:8px;filter:drop-shadow(0 0 12px rgba(0,180,255,.3))}
.stat-name{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:6px}
.stat-desc{font-size:13px;color:var(--text-secondary)}
.stats-note{text-align:center;font-size:12px;color:var(--text-muted);margin-top:40px;padding-top:20px;border-top:1px solid var(--border-light);max-width:600px;margin-left:auto;margin-right:auto}

/* ===== FAQ ===== */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:22px 28px;margin-bottom:14px;backdrop-filter:blur(12px);transition:border-color .3s,box-shadow .3s}
.faq-item.active{border-color:rgba(0,212,255,.3);box-shadow:0 0 20px rgba(0,212,255,.06)}
.faq-question{display:flex;align-items:center;justify-content:space-between;font-size:16px;font-weight:600;cursor:pointer;color:var(--text-primary);transition:color .3s}
.faq-question:hover{color:var(--accent)}
.faq-icon{width:28px;height:28px;border-radius:50%;background:rgba(0,212,255,.08);border:1px solid rgba(0,212,255,.25);display:flex;align-items:center;justify-content:center;font-size:18px;color:var(--accent);transition:all .35s;flex-shrink:0}
.faq-item.active .faq-icon{transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s ease;color:var(--text-secondary);font-size:14.5px;line-height:1.7}
.faq-item.active .faq-answer{max-height:320px;padding-top:14px}

/* ===== News Section ===== */
.news-section{background:var(--bg-secondary);border-top:1px solid var(--border-light);border-bottom:1px solid var(--border-light)}
.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:36px;gap:20px}
.section-head .section-title{margin-bottom:0;text-align:left}
.section-more{font-size:14px;color:#38BDF8;display:inline-flex;align-items:center;gap:5px;transition:all .3s}
.section-more:hover{color:var(--accent);gap:9px}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;backdrop-filter:blur(14px);box-shadow:var(--shadow-card);transition:all .35s ease}
.news-card:hover{transform:translateY(-5px);border-color:rgba(0,212,255,.25);box-shadow:var(--shadow-card),var(--shadow-glow)}
.news-cover{position:relative;display:block;aspect-ratio:16/10;overflow:hidden;background:linear-gradient(135deg,#0B1B36,#0E1830)}
.news-cover img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.news-card:hover .news-cover img{transform:scale(1.05)}
.news-tag{position:absolute;top:14px;left:14px;padding:5px 14px;background:rgba(7,13,26,.65);border:1px solid rgba(0,212,255,.35);border-radius:20px;font-size:12px;color:var(--accent);backdrop-filter:blur(8px);z-index:1}
.news-body{padding:22px 22px 18px}
.news-body h3{font-size:17px;font-weight:600;line-height:1.45;margin-bottom:8px}
.news-body h3 a{color:var(--text-primary);transition:color .3s}
.news-body h3 a:hover{color:var(--accent)}
.news-excerpt{font-size:14px;color:var(--text-secondary);line-height:1.65;margin-bottom:16px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-meta{display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--text-muted);border-top:1px solid var(--border-light);padding-top:14px}
.news-more{color:#38BDF8;font-size:13px;font-weight:500;transition:color .3s}
.news-more:hover{color:var(--accent)}
.news-empty{grid-column:1/-1;text-align:center;padding:60px 20px;background:rgba(255,255,255,.02);border:1px dashed rgba(255,255,255,.1);border-radius:var(--radius-lg)}
.empty-icon{font-size:48px;margin-bottom:12px;opacity:.5}
.news-empty p{font-size:15px;color:var(--text-secondary)}

/* ===== Help Section (Form Trigger) ===== */
.help-section{padding:80px 0}
.help-panel{max-width:880px;margin:0 auto;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:56px 48px;text-align:center;backdrop-filter:blur(18px);box-shadow:var(--shadow-card);position:relative;overflow:hidden}
.help-panel::before{content:"";position:absolute;width:500px;height:500px;background:radial-gradient(closest-side,rgba(0,160,255,.1),transparent);top:-200px;right:-100px;filter:blur(30px);pointer-events:none}
.help-panel h2{font-size:clamp(24px,3.2vw,30px);font-weight:700;margin-bottom:12px}
.help-panel p{color:var(--text-secondary);font-size:15px;margin-bottom:30px}
.privacy-note{display:flex;align-items:center;justify-content:center;gap:7px;font-size:12px;color:var(--text-muted);margin-top:20px}

/* ===== CTA Section ===== */
.cta-section{position:relative;padding:100px 0;overflow:hidden}
.cta-section::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse at center,rgba(0,120,255,.14) 0%,rgba(7,13,26,.95) 70%)}
.cta-panel{position:relative;z-index:2;text-align:center;max-width:760px;margin:0 auto;background:rgba(255,255,255,.04);border:1px solid rgba(0,212,255,.18);border-radius:calc(var(--radius-lg) + 8px);padding:60px 52px;backdrop-filter:blur(20px);box-shadow:0 20px 60px rgba(0,0,0,.45),var(--shadow-glow)}
.cta-panel h2{font-size:clamp(26px,3.5vw,34px);font-weight:700;margin-bottom:14px}
.cta-panel p{color:var(--text-secondary);font-size:15px;margin-bottom:32px}

/* ===== Footer ===== */
.site-footer{background:#050A14;border-top:1px solid rgba(0,212,255,.28);position:relative}
.footer-accent{position:absolute;top:-1px;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,rgba(0,212,255,.6),transparent)}
.footer-content{display:grid;grid-template-columns:1.4fr 0.8fr 0.8fr 1fr;gap:40px;padding:64px 24px 44px}
.footer-brand .footer-logo{font-size:20px;font-weight:800;background:linear-gradient(90deg,#EAF0F8,#9CD8FF);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:14px;display:inline-block}
.footer-brand p{font-size:13.5px;color:var(--text-muted);line-height:1.7;max-width:290px}
.footer-col h4{font-size:15px;font-weight:600;color:var(--text-primary);margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:"";position:absolute;left:0;bottom:0;width:28px;height:2px;background:var(--accent);box-shadow:0 0 8px rgba(0,212,255,.4)}
.footer-col a{display:block;font-size:14px;color:var(--text-secondary);padding:4px 0;transition:color .3s,padding-left .3s}
.footer-col a:hover{color:var(--accent);padding-left:6px}
.footer-col p{font-size:13.5px;color:var(--text-secondary);padding:4px 0}
.footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding:18px 0}
.footer-bottom .container{display:flex;justify-content:center;align-items:center;font-size:12px;color:var(--text-muted)}

/* ===== Modal ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.65);backdrop-filter:blur(8px);z-index:2000;display:none;align-items:center;justify-content:center;padding:20px}
.modal-overlay.open{display:flex}
.modal-panel{width:480px;max-width:100%;background:linear-gradient(160deg,rgba(16,27,50,.98),rgba(9,16,30,.98));border:1px solid rgba(0,212,255,.22);border-radius:20px;padding:38px 36px;box-shadow:0 24px 80px rgba(0,0,0,.6),var(--shadow-glow);position:relative;max-height:92vh;overflow-y:auto;animation:modalIn .35s ease}
@keyframes modalIn{from{opacity:0;transform:translateY(30px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}
.modal-close{position:absolute;top:14px;right:14px;width:36px;height:36px;border-radius:50%;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.04);color:var(--text-secondary);font-size:22px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s}
.modal-close:hover{border-color:var(--error);color:var(--error);transform:rotate(90deg)}
.modal-panel h2{font-size:24px;font-weight:700;margin-bottom:8px}
.modal-sub{font-size:14px;color:var(--text-secondary);margin-bottom:26px}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:13.5px;font-weight:500;color:var(--text-primary);margin-bottom:7px}
.form-group input,.form-group select{width:100%;height:46px;background:var(--bg-input);border:1px solid rgba(255,255,255,.15);border-radius:var(--radius-sm);padding:0 16px;font-size:14px;color:var(--text-primary);transition:all .3s}
.form-group input::placeholder{color:var(--text-muted)}
.form-group input:focus,.form-group select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,212,255,.12)}
.form-group input.error,.form-group select.error{border-color:var(--error)}
.form-error{display:none;font-size:12px;color:var(--error);margin-top:5px}
.form-group.has-error .form-error{display:block}
.code-row{display:flex;gap:10px}
.code-row input{flex:1}
.code-row .btn{flex-shrink:0}
.privacy-note{margin-top:16px}

/* ===== Float Button ===== */
.float-btn{position:fixed;right:26px;bottom:34px;z-index:1500;display:flex;flex-direction:column;align-items:center;justify-content:center;width:64px;height:64px;border-radius:50%;background:var(--gradient-primary);color:#fff;font-size:12px;font-weight:600;box-shadow:0 6px 28px rgba(0,150,255,.4);transition:all .35s;backdrop-filter:blur(8px);z-index:1500}
.float-btn:hover{transform:translateY(-4px) scale(1.04);box-shadow:0 10px 34px rgba(0,200,255,.5)}
.float-btn .float-icon{font-size:22px;line-height:1;margin-bottom:2px}

/* ===== Responsive ===== */
@media (max-width:1199px){
  .news-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:1023px){
  .main-nav{position:fixed;top:72px;left:0;right:0;background:rgba(5,10,20,.97);backdrop-filter:blur(30px);flex-direction:column;padding:28px 24px 24px;gap:22px;transform:translateY(0);display:none;border-bottom:1px solid var(--border);box-shadow:0 20px 40px rgba(0,0,0,.5)}
  .main-nav.open{display:flex}
  .nav-link{font-size:17px}
  .nav-cta{margin-left:0}
  .nav-toggle{display:flex}
  .solution-grid{grid-template-columns:1fr 1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .stat-item:nth-child(2)::after{display:none}
  .footer-content{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px){
  .container{padding:0 16px}
  .section{padding:var(--space-section-sm) 0}
  .hero{min-height:75vh;padding:110px 0 70px}
  .hero h1{font-size:clamp(32px,8vw,42px)}
  .hero-sub{font-size:15px;line-height:1.65}
  .hero-actions{flex-direction:column;align-items:center;width:100%}
  .hero-actions .btn{width:86%;max-width:320px}
  .hero-badges{gap:8px}
  .trust-badge{padding:6px 14px;font-size:12px}
  .pain-timeline{padding-left:30px}
  .pain-item{padding:18px 12px 18px 0;gap:14px}
  .pain-icon{left:-22px;width:30px;height:30px;font-size:13px}
  .pain-text{font-size:14.5px}
  .solution-grid{grid-template-columns:1fr}
  .solution-card{padding:26px 22px}
  .stats-grid{grid-template-columns:1fr;gap:0}
  .stat-item::after{display:none!important;border:none}
  .stat-number{font-size:44px}
  .section-head{flex-direction:column;align-items:flex-start;gap:8px}
  .news-grid{grid-template-columns:1fr}
  .help-panel{padding:40px 24px}
  .cta-panel{padding:42px 24px}
  .footer-content{grid-template-columns:1fr}
  .footer-col a,.footer-col p{font-size:14px}
  .modal-panel{padding:30px 22px;width:100%}
  .float-btn{width:56px;height:56px;font-size:11px;right:16px;bottom:20px}
  .float-btn .float-icon{font-size:19px}
  .footer-bottom .container{flex-wrap:wrap;gap:4px;text-align:center}
}
@media (max-width:380px){
  .brand-text{font-size:15px}
  .solution-card p{font-size:14px}
  .btn{padding:0 18px}
}

/* roulang page: category1 */
:root {
  --bg-primary: #070D1A;
  --bg-secondary: #0B1420;
  --bg-panel: rgba(255, 255, 255, 0.06);
  --bg-input: #0E1830;
  --accent-blue: #2E7CF6;
  --accent-cyan: #00D4FF;
  --accent-gold: #F0B54A;
  --text-main: #EAF0F8;
  --text-secondary: #8FA3BF;
  --text-weak: #566A85;
  --border-light: rgba(255, 255, 255, 0.12);
  --border-cyan: rgba(0, 212, 255, 0.35);
  --success: #34D399;
  --error: #F87171;
  --warning: #FBBF24;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-cyan: 0 0 24px rgba(0, 212, 255, 0.15);
  --gradient-primary: linear-gradient(135deg, #2E7CF6, #00D4FF);
  --font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  background-image: radial-gradient(ellipse 60% 40% at 70% 0%, rgba(0, 212, 255, 0.06), transparent 60%),
                    radial-gradient(ellipse 40% 30% at 20% 30%, rgba(46, 124, 246, 0.05), transparent 60%);
  color: var(--text-main);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a {
  color: #38BDF8;
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: 14px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(7, 13, 26, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.25);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.site-header.scrolled {
  background: rgba(7, 13, 26, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, #2E7CF6, #00D4FF);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.4);
  position: relative;
  flex-shrink: 0;
}

.brand-icon::after {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.15);
  -webkit-mask: linear-gradient(135deg, transparent 30%, rgba(255,255,255,0.9) 50%, transparent 70%);
  mask: linear-gradient(135deg, transparent 30%, rgba(255,255,255,0.9) 50%, transparent 70%);
  animation: brandPulse 3s ease-in-out infinite;
}

@keyframes brandPulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

.brand-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: #C7D4EA;
  font-size: 15px;
  font-weight: 500;
  padding: 8px 2px;
  position: relative;
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.nav-link:hover {
  color: var(--accent-cyan);
  text-decoration: none;
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link.active {
  color: var(--accent-cyan);
  font-weight: 600;
}

.nav-link.active::after {
  transform: scaleX(1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all 0.25s ease;
  cursor: pointer;
  border: none;
  text-decoration: none;
  line-height: 1.2;
}

.btn:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.25);
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  padding: 0 22px;
  height: 42px;
  font-size: 14px;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 28px rgba(0, 212, 255, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  color: #fff;
  text-decoration: none;
}

.btn-primary:active {
  transform: translateY(0);
  filter: brightness(0.9);
}

.btn-secondary {
  background: var(--bg-panel);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--text-main);
  padding: 0 22px;
  height: 42px;
  font-size: 14px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.15);
  color: var(--accent-cyan);
  text-decoration: none;
  transform: translateY(-2px);
}

.nav-cta {
  height: 38px;
  padding: 0 18px;
  font-size: 14px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 6px;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 2px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Page Hero */
.page-hero {
  position: relative;
  padding: 180px 0 80px;
  background-image: url('/assets/images/backpic/back-1.webp');
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(7, 13, 26, 0.82), rgba(7, 13, 26, 0.72));
  z-index: 1;
}

.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 40% at 50% 100%, rgba(0, 212, 255, 0.1), transparent 70%);
  z-index: 1;
}

.page-hero .container {
  position: relative;
  z-index: 2;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  color: var(--accent-cyan);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.page-hero h1 {
  font-size: clamp(34px, 5vw, 48px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text-main);
}

.page-hero h1 .gradient-text {
  background: linear-gradient(135deg, #2E7CF6, #00D4FF);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.page-hero .hero-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-trust {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
}

.trust-item i {
  color: var(--accent-cyan);
  font-size: 16px;
}

/* Section */
.section {
  padding: 96px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.section h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 16px;
  color: var(--text-main);
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

/* Steps */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.step-card {
  background: var(--bg-panel);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-card);
}

.step-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 255, 0.35);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4), 0 0 24px rgba(0, 212, 255, 0.1);
}

.step-number {
  font-size: 48px;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.15);
  position: absolute;
  top: 16px;
  right: 24px;
  line-height: 1;
  transition: all 0.3s ease;
}

.step-card:hover .step-number {
  color: rgba(0, 212, 255, 0.5);
  text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.step-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(46, 124, 246, 0.2), rgba(0, 212, 255, 0.2));
  border: 1px solid rgba(0, 212, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 22px;
  color: var(--accent-cyan);
}

.step-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-main);
}

.step-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.75;
}

.step-card .step-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  color: #38BDF8;
  font-weight: 500;
}

.step-card .step-link:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
}

/* Feature band */
.feature-band {
  background: var(--bg-secondary);
  padding: 96px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-item {
  padding: 32px 28px;
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}

.feature-item:hover {
  background: rgba(255, 255, 255, 0.04);
}

.feature-item .feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--accent-cyan);
  margin-bottom: 20px;
}

.feature-item h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 10px;
}

.feature-item p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* Materials */
.materials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.material-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
  transition: all 0.3s ease;
}

.material-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-cyan);
  transform: translateY(-4px);
}

.material-icon {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(46, 124, 246, 0.15), rgba(0, 212, 255, 0.15));
  border: 1px solid rgba(0, 212, 255, 0.3);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: var(--accent-cyan);
  margin-bottom: 24px;
}

.material-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 12px;
}

.material-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.material-card .tag {
  display: inline-block;
  margin-top: 20px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent-cyan);
  font-size: 12px;
  padding: 3px 14px;
  border-radius: 999px;
}

/* Timeline */
.flow-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.flow-item {
  display: flex;
  gap: 28px;
  position: relative;
  padding-bottom: 48px;
}

.flow-item:last-child {
  padding-bottom: 0;
}

.flow-item::before {
  content: '';
  position: absolute;
  left: 19px;
  top: 48px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(0, 212, 255, 0.5), rgba(0, 212, 255, 0.08));
}

.flow-item:last-child::before {
  display: none;
}

.flow-marker {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent-cyan);
  flex-shrink: 0;
  z-index: 1;
}

.flow-content {
  padding-top: 4px;
}

.flow-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

.flow-content p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.flow-content .flow-tip {
  display: inline-block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--accent-gold);
  background: rgba(240, 181, 74, 0.08);
  border-radius: 6px;
  padding: 4px 10px;
  border: 1px solid rgba(240, 181, 74, 0.2);
}

/* FAQ */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-panel);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item:hover {
  border-color: rgba(0, 212, 255, 0.25);
}

.faq-item.open {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.06);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 15.5px;
  color: var(--text-main);
  gap: 20px;
  user-select: none;
}

.faq-question:hover {
  color: var(--accent-cyan);
}

.faq-toggle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid rgba(0, 212, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--accent-cyan);
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.faq-item.open .faq-toggle {
  transform: rotate(45deg);
  background: rgba(0, 212, 255, 0.15);
}

.faq-answer {
  display: none;
  padding: 0 24px 22px;
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.85;
}

.faq-item.open .faq-answer {
  display: block;
  animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* CTA */
.cta-section {
  padding: 96px 0 100px;
}

.cta-panel {
  background: var(--bg-panel);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: 24px;
  padding: 64px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-panel::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 140%;
  height: 200%;
  background: radial-gradient(ellipse 40% 30% at 50% 50%, rgba(0, 212, 255, 0.08), transparent 70%);
  pointer-events: none;
}

.cta-panel .cta-icon {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(46, 124, 246, 0.2), rgba(0, 212, 255, 0.2));
  border: 1px solid rgba(0, 212, 255, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 28px;
  font-size: 26px;
  color: var(--accent-cyan);
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.15);
}

.cta-panel h2 {
  font-size: clamp(26px, 3.5vw, 34px);
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  position: relative;
}

.cta-panel p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 32px;
  line-height: 1.8;
  position: relative;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  position: relative;
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: none;
}

.footer-accent {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.6), transparent);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding: 64px 24px 48px;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  display: inline-block;
  margin-bottom: 16px;
  text-decoration: none;
}

.footer-logo:hover {
  color: var(--accent-cyan);
  text-decoration: none;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 18px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 10px;
  transition: all 0.2s ease;
  text-decoration: none;
}

.footer-col a:hover {
  color: var(--accent-cyan);
  padding-left: 4px;
}

.footer-col p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 20px 0;
}

.footer-bottom .container {
  text-align: center;
}

.footer-bottom span {
  font-size: 12px;
  color: var(--text-weak);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .materials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }
  .feature-band {
    padding: 64px 0;
  }
  .cta-section {
    padding: 64px 0;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 78%;
    max-width: 360px;
    height: 100vh;
    background: rgba(7, 13, 26, 0.97);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 22px;
    padding: 40px 24px;
    transition: right 0.4s cubic-bezier(0.77, 0, 0.175, 1);
    border-left: 1px solid rgba(0, 212, 255, 0.2);
    z-index: 999;
  }

  .main-nav.open {
    right: 0;
  }

  .main-nav .nav-link {
    font-size: 20px;
    color: var(--text-main);
  }

  .main-nav .nav-link::after {
    left: 50%;
    right: 50%;
    width: auto;
    transform: scaleX(0);
  }

  .main-nav .nav-link:hover::after {
    transform: scaleX(1);
  }

  .main-nav .nav-cta {
    margin-top: 12px;
    font-size: 16px;
    height: 48px;
    padding: 0 32px;
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .step-card {
    padding: 28px 24px;
  }

  .step-icon {
    width: 44px;
    height: 44px;
    font-size: 19px;
  }

  .hero-trust {
    gap: 16px;
  }

  .page-hero {
    padding: 140px 0 60px;
  }

  .page-hero h1 {
    font-size: 34px;
  }
}

@media (max-width: 640px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: 36px;
    padding: 48px 24px 32px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .materials-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .cta-panel {
    padding: 48px 24px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-actions .btn {
    width: 100%;
    max-width: 320px;
  }

  .flow-item {
    gap: 16px;
  }

  .flow-marker {
    width: 34px;
    height: 34px;
    font-size: 13px;
  }

  .flow-item::before {
    left: 16px;
  }

  .faq-question {
    padding: 18px 18px;
    font-size: 14.5px;
  }

  .faq-answer {
    padding: 0 18px 18px;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .section-subtitle {
    font-size: 15px;
    padding: 0 16px;
  }

  .page-hero .hero-subtitle {
    font-size: 15px;
  }

  .brand-text {
    font-size: 16px;
  }
}

/* roulang page: article */
:root{
  --bg-primary:#070D1A;--bg-secondary:#0B1420;--bg-panel:rgba(255,255,255,.06);
  --accent-blue:#2E7CF6;--accent-cyan:#00D4FF;--accent-gold:#F0B54A;
  --text-main:#EAF0F8;--text-secondary:#8FA3BF;--text-weak:#566A85;
  --success:#34D399;--error:#F87171;--warning:#FBBF24;
  --border-light:rgba(255,255,255,.12);--border-cyan:rgba(0,212,255,.25);
  --radius-lg:16px;--radius-sm:12px;--radius-xs:8px;
  --shadow-card:0 8px 32px rgba(0,0,0,.35);--shadow-glow:0 0 24px rgba(0,212,255,.15);
  --container-max:1200px;--font-sans:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-main);
  line-height:1.75;font-size:15px;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--accent-cyan);text-decoration:none;transition:color .2s}
a:hover{color:#7de6ff}
button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
ul,ol{list-style:none}
.container{max-width:var(--container-max);margin:0 auto;padding-left:24px;padding-right:24px}
@media(max-width:768px){.container{padding-left:16px;padding-right:16px}}

/* ========== 导航 ========== */
.site-header{
  position:sticky;top:0;z-index:1000;background:rgba(7,13,26,.85);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border-cyan);transition:background .3s,box-shadow .3s;
}
.site-header.scrolled{background:rgba(5,10,20,.95);box-shadow:0 4px 24px rgba(0,0,0,.45)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px}
.brand-icon{
  width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--accent-blue),var(--accent-cyan));
  box-shadow:0 0 18px rgba(0,212,255,.35);display:inline-block;position:relative;flex-shrink:0;
}
.brand-icon::after{
  content:'';position:absolute;inset:5px;border:2px solid rgba(255,255,255,.55);border-radius:6px;
}
.brand-text{font-size:20px;font-weight:800;letter-spacing:.5px;color:var(--text-main);white-space:nowrap}
.main-nav{display:flex;align-items:center;gap:6px}
.nav-link{
  display:inline-block;padding:10px 16px;color:#C7D4EA;font-size:15px;font-weight:500;
  border-radius:8px;position:relative;transition:color .25s,background .25s;
}
.nav-link::after{
  content:'';position:absolute;left:16px;right:16px;bottom:4px;height:2px;border-radius:2px;
  background:var(--accent-cyan);box-shadow:0 0 8px rgba(0,212,255,.6);
  transform:scaleX(0);opacity:0;transition:transform .3s,opacity .3s;
}
.nav-link:hover{color:var(--accent-cyan)}
.nav-link:hover::after,.nav-link.active::after{transform:scaleX(1);opacity:1}
.nav-link.active{color:var(--accent-cyan)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;border:none;cursor:pointer;
  font-weight:700;border-radius:var(--radius-sm);transition:all .25s;text-decoration:none;
}
.btn:focus-visible{outline:2px solid var(--accent-cyan);outline-offset:3px}
.btn-primary{
  background:linear-gradient(135deg,var(--accent-blue),var(--accent-cyan));color:#fff;
  padding:10px 22px;font-size:14px;box-shadow:0 4px 16px rgba(46,124,246,.3),inset 0 1px 0 rgba(255,255,255,.2);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(0,212,255,.4);color:#fff}
.btn-primary:active{transform:translateY(0);filter:brightness(.9)}
.btn-secondary{
  background:rgba(255,255,255,.06);color:var(--text-main);padding:10px 22px;font-size:14px;
  border:1px solid var(--border-light);backdrop-filter:blur(12px);
}
.btn-secondary:hover{border-color:var(--accent-cyan);box-shadow:var(--shadow-glow);color:var(--accent-cyan)}
.nav-cta{margin-left:12px;padding:10px 20px}
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;background:none;border:none;
  width:44px;height:44px;padding:10px;cursor:pointer;border-radius:8px;
}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--text-main);border-radius:2px;transition:transform .3s,opacity .3s}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media(max-width:1024px){
  .nav-toggle{display:flex}
  .main-nav{
    position:fixed;top:72px;left:0;right:0;background:rgba(7,13,26,.97);backdrop-filter:blur(20px);
    flex-direction:column;align-items:stretch;padding:20px 24px;gap:4px;border-bottom:1px solid var(--border-cyan);
    transform-origin:top;transform:scaleY(0);opacity:0;visibility:hidden;transition:transform .3s,opacity .3s,visibility .3s;
    max-height:calc(100vh - 72px);overflow-y:auto;z-index:999;
  }
  .main-nav.open{transform:scaleY(1);opacity:1;visibility:visible}
  .nav-link{padding:14px 16px;font-size:16px}
  .nav-link::after{left:16px;right:auto;width:40px;transform:scaleX(0)}
  .nav-link.active::after{transform:scaleX(1)}
  .nav-cta{margin:16px 0 8px;text-align:center}
}

/* ========== 文章主体 ========== */
.article-main{padding:40px 0 80px;min-height:64vh}
.article-breadcrumb{
  max-width:800px;margin:0 auto 32px;display:flex;align-items:center;flex-wrap:wrap;gap:8px;
  font-size:13px;color:var(--text-weak);
}
.article-breadcrumb a{color:var(--text-secondary);transition:color .2s}
.article-breadcrumb a:hover{color:var(--accent-cyan)}
.crumb-sep{color:var(--text-weak);font-size:12px;opacity:.6}
.crumb-current{color:var(--accent-cyan);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:280px}

.article-hero{
  position:relative;overflow:hidden;margin-bottom:32px;
  background:linear-gradient(135deg,rgba(11,27,54,.92),rgba(7,13,26,.96)),url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  border-radius:var(--radius-lg);padding:48px 40px;border:1px solid var(--border-light);
}
.article-hero::before{
  content:'';position:absolute;top:-40%;right:-20%;width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(0,212,255,.15),transparent 70%);pointer-events:none;
}
.article-hero-content{position:relative;z-index:1;max-width:760px}
.article-hero h1{
  font-size:clamp(26px,4vw,38px);font-weight:800;line-height:1.35;margin-bottom:18px;color:var(--text-main);
}
.article-meta{
  display:flex;align-items:center;flex-wrap:wrap;gap:8px 20px;font-size:13px;color:var(--text-secondary);
}
.article-meta span{display:inline-flex;align-items:center;gap:6px}
.meta-icon{width:14px;height:14px;opacity:.6;position:relative}
.meta-icon::before{content:'';position:absolute;inset:0;border-radius:50%;border:1.5px solid currentColor;opacity:.8}
.article-category{
  display:inline-flex;align-items:center;gap:6px;padding:4px 14px;background:rgba(0,212,255,.1);
  border:1px solid rgba(0,212,255,.3);border-radius:20px;font-size:12px;color:var(--accent-cyan);font-weight:600;
}

/* 正文阅读区 */
.article-body{
  max-width:800px;margin:0 auto;padding:36px 0 56px;
}
.article-toc{
  max-width:800px;margin:24px auto 0;padding:20px 24px;background:rgba(255,255,255,.04);
  border:1px solid var(--border-light);border-radius:var(--radius-sm);display:none;
}
.article-toc-title{font-size:14px;font-weight:700;color:var(--accent-cyan);margin-bottom:12px;display:flex;align-items:center;gap:8px}
.article-toc ul{display:flex;flex-direction:column;gap:6px}
.article-toc a{font-size:14px;color:var(--text-secondary);transition:color .2s}
.article-toc a:hover{color:var(--accent-cyan)}

.article-body h2{
  font-size:clamp(20px,3vw,26px);font-weight:700;margin:48px 0 20px;color:var(--text-main);
  padding-left:14px;border-left:3px solid var(--accent-cyan);position:relative;
}
.article-body h2::after{
  content:'';position:absolute;left:14px;right:0;bottom:-6px;height:1px;
  background:linear-gradient(90deg,var(--border-cyan),transparent);
}
.article-body h3{font-size:clamp(18px,2.4vw,22px);font-weight:600;margin:36px 0 16px;color:var(--text-main)}
.article-body p{margin-bottom:24px;color:#c5d2e5;line-height:1.85}
.article-body ul,.article-body ol{margin:0 0 24px;padding-left:24px;color:#c5d2e5}
.article-body ul{list-style:disc}
.article-body ol{list-style:decimal}
.article-body li{margin-bottom:8px;line-height:1.7}
.article-body blockquote{
  margin:28px 0;padding:20px 24px;border-left:3px solid var(--accent-cyan);
  background:rgba(0,212,255,.05);border-radius:0 var(--radius-xs) var(--radius-xs) 0;color:var(--text-secondary);
  font-style:italic;
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body table{width:100%;margin:28px 0;border-collapse:collapse;font-size:14px}
.article-body th,.article-body td{padding:12px 16px;border:1px solid var(--border-light);text-align:left}
.article-body th{background:rgba(46,124,246,.1);color:var(--accent-cyan);font-weight:600}
.article-body tr:nth-child(even) td{background:rgba(255,255,255,.02)}
.article-body img{border-radius:12px;margin:28px auto;box-shadow:var(--shadow-card)}
.article-body pre{
  background:#0a1526;border:1px solid var(--border-light);border-radius:var(--radius-sm);
  padding:18px 20px;overflow-x:auto;margin:28px 0;font-size:14px;line-height:1.6;color:#d7e2f1;
}
.article-body code{background:rgba(0,0,0,.4);padding:2px 6px;border-radius:4px;font-size:14px;color:#67e8f9}
.article-body pre code{background:none;padding:0;color:inherit}

/* 内容未找到 */
.article-not-found{
  max-width:640px;margin:100px auto;text-align:center;padding:60px 40px;
  background:rgba(255,255,255,.04);border:1px solid var(--border-light);border-radius:var(--radius-lg);
}
.article-not-found h1{font-size:30px;font-weight:800;margin-bottom:16px}
.article-not-found p{color:var(--text-secondary);margin-bottom:28px}

/* 相关推荐 */
.article-related{max-width:800px;margin:0 auto;padding:56px 0 16px;border-top:1px solid var(--border-light)}
.article-related h2{font-size:22px;font-weight:700;margin-bottom:28px;display:flex;align-items:center;gap:10px}
.article-related h2::before{
  content:'';width:4px;height:22px;border-radius:2px;background:linear-gradient(180deg,var(--accent-blue),var(--accent-cyan));
}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.related-card{
  display:block;background:var(--bg-panel);border:1px solid var(--border-light);border-radius:var(--radius-sm);
  overflow:hidden;transition:transform .3s,border-color .3s,box-shadow .3s;text-decoration:none;
}
.related-card:hover{transform:translateY(-4px);border-color:var(--border-cyan);box-shadow:var(--shadow-glow)}
.related-cover{height:130px;background-size:cover;background-position:center;position:relative;overflow:hidden}
.related-cover::after{
  content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 50%,rgba(7,13,26,.8));
}
.related-info{padding:16px 18px 14px}
.related-info h3{font-size:15px;font-weight:600;color:var(--text-main);line-height:1.45;margin-bottom:6px}
.related-info p{font-size:13px;color:var(--text-secondary);line-height:1.6;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.related-date{font-size:12px;color:var(--text-weak)}

/* 返回入口 */
.article-back{max-width:800px;margin:0 auto;padding:24px 0 8px;text-align:center}
.article-back .btn{margin:0 8px}

/* ========== 页脚 ========== */
.site-footer{background:var(--bg-secondary);border-top:1px solid var(--border-light);margin-top:40px;position:relative}
.footer-accent{height:1px;background:linear-gradient(90deg,transparent,var(--accent-cyan),transparent);box-shadow:0 0 12px rgba(0,212,255,.5)}
.footer-content{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:32px;padding:56px 24px 40px}
.footer-brand .footer-logo{font-size:20px;font-weight:800;color:var(--text-main);display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand p{font-size:14px;color:var(--text-secondary);line-height:1.7;max-width:260px}
.footer-col h4{font-size:15px;font-weight:600;color:var(--text-main);margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:'';position:absolute;left:0;bottom:0;width:24px;height:2px;border-radius:2px;background:var(--accent-cyan)}
.footer-col a{display:block;font-size:14px;color:var(--text-secondary);padding:5px 0;transition:color .2s,padding-left .2s}
.footer-col a:hover{color:var(--accent-cyan);padding-left:6px}
.footer-col p{font-size:14px;color:var(--text-secondary);line-height:1.8}
.footer-bottom{background:rgba(0,0,0,.25);padding:16px 0;text-align:center;border-top:1px solid rgba(255,255,255,.05)}
.footer-bottom span{font-size:12px;color:var(--text-weak)}
@media(max-width:1024px){
  .footer-content{grid-template-columns:1fr 1fr;gap:24px}
  .related-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .article-hero{padding:32px 20px}
  .article-main{padding:24px 0 56px}
  .article-body{padding:24px 0 40px}
  .article-related{padding:40px 0 16px}
  .footer-content{grid-template-columns:1fr;gap:28px;padding:40px 16px 32px}
  .footer-bottom{padding:14px 16px}
  .related-grid{grid-template-columns:1fr}
}
@media(max-width:520px){
  .article-breadcrumb{font-size:12px}
  .crumb-current{max-width:180px}
  .article-hero h1{font-size:24px}
  .article-meta{font-size:12px;gap:6px 14px}
  .article-body h2{font-size:19px}
  .article-related h2{font-size:19px}
}

/* roulang page: category2 */
:root {
  --bg-main: #070d1a;
  --bg-sub: #0b1420;
  --bg-panel: rgba(255, 255, 255, 0.06);
  --bg-panel-hover: rgba(255, 255, 255, 0.09);
  --primary: #2e7cf6;
  --accent: #00d4ff;
  --gold: #f0b54a;
  --text-main: #eaf0f8;
  --text-sub: #8fa3bf;
  --text-weak: #566a85;
  --success: #34d399;
  --error: #f87171;
  --line: rgba(255, 255, 255, 0.12);
  --line-accent: rgba(0, 212, 255, 0.25);
  --radius-lg: 16px;
  --radius-sm: 12px;
  --radius-input: 8px;
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
  --glow-primary: 0 0 24px rgba(0, 212, 255, 0.15);
  --font-main: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --header-h: 76px;
  --space-section: 100px;
  --space-section-mobile: 58px;
  --section-width: 1200px;
}
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-main);
  font-size: 15px;
  line-height: 1.75;
  background: var(--bg-main);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
}
a {
  color: #38bdf8;
  text-decoration: none;
  transition: color 0.25s ease;
}
a:hover {
  color: var(--accent);
}
img {
  max-width: 100%;
  display: block;
}
button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  outline: none;
}
.container {
  max-width: var(--section-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(7, 13, 26, 0.85);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line-accent);
  height: var(--header-h);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.site-header.scrolled {
  background: rgba(7, 13, 26, 0.94);
  box-shadow: 0 6px 30px rgba(0, 0, 0, 0.45);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.35);
  position: relative;
  flex-shrink: 0;
}
.brand-icon::after {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: 6px;
  background: rgba(7, 13, 26, 0.6);
  clip-path: polygon(50% 10%, 82% 38%, 68% 72%, 32% 72%, 18% 38%);
}
.brand-text {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-main);
  white-space: nowrap;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.main-nav .nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 16px;
  font-size: 14px;
  color: #c7d4ea;
  border-radius: 8px;
  font-weight: 500;
  transition: color 0.25s ease;
}
.main-nav .nav-link:hover {
  color: var(--accent);
}
.main-nav .nav-link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  opacity: 0;
  transform: scaleX(0.4);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.main-nav .nav-link:hover::after {
  opacity: 1;
  transform: scaleX(1);
}
.main-nav .nav-link.active {
  color: var(--accent);
}
.main-nav .nav-link.active::after {
  opacity: 1;
  transform: scaleX(1);
}
.nav-cta {
  margin-left: 12px;
  white-space: nowrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 26px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
  border: none;
  cursor: pointer;
  text-align: center;
  transition: all 0.25s ease;
  text-decoration: none;
}
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px rgba(0, 212, 255, 0.15);
}
.btn-primary {
  background: linear-gradient(135deg, #2e7cf6, #00d4ff);
  color: #fff;
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.3);
  color: #fff;
}
.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.2);
}
.btn-outline {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  color: var(--text-main);
  backdrop-filter: blur(8px);
}
.btn-outline:hover {
  border-color: var(--accent);
  box-shadow: var(--glow-primary);
  color: var(--accent);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  padding: 10px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--text-main);
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-toggle span:nth-child(2) {
  width: 24px;
}
.nav-toggle span:nth-child(3) {
  width: 18px;
}
.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  width: 100%;
}

/* ===== Skeleton / Section base ===== */
.section {
  padding: var(--space-section) 0;
  position: relative;
}
.section-head {
  margin-bottom: 50px;
  max-width: 720px;
}
.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}
.section-tag {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 30px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 18px;
}
.section h2 {
  font-size: clamp(28px, 4vw, 36px);
  line-height: 1.3;
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: -0.01em;
}
.section h2 .grad {
  background: linear-gradient(120deg, var(--accent), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-head p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.8;
}
.section-sub-title {
  font-size: 16px;
  color: var(--text-sub);
  line-height: 1.8;
  margin-top: 4px;
}

/* ===== Category Hero ===== */
.cat-hero {
  margin-top: var(--header-h);
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: url('/assets/images/backpic/back-2.webp');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  border-bottom: 1px solid var(--line-accent);
  overflow: hidden;
}
.cat-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 40%, rgba(11, 27, 54, 0.7) 0%, rgba(7, 13, 26, 0.88) 100%);
}
.cat-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 13, 26, 0.5) 0%, rgba(7, 13, 26, 0.1) 50%, rgba(7, 13, 26, 0.85) 100%);
}
.cat-hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 80px 24px;
  max-width: 860px;
}
.cat-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.35);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  backdrop-filter: blur(8px);
  margin-bottom: 26px;
}
.cat-hero-badge::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}
.cat-hero h1 {
  font-size: clamp(34px, 5.4vw, 52px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
}
.cat-hero h1 .grad {
  background: linear-gradient(120deg, var(--accent), #7aa7ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.cat-hero p {
  font-size: 17px;
  line-height: 1.8;
  color: #c0cee4;
  max-width: 640px;
  margin: 0 auto 34px;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-actions .btn {
  padding: 14px 38px;
  font-size: 15px;
}
.hero-trust {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 42px;
  flex-wrap: wrap;
}
.hero-trust span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: rgba(234, 240, 248, 0.72);
}
.hero-trust i {
  color: var(--accent);
  font-style: normal;
  font-size: 15px;
}

/* ===== Value section ===== */
.value-section {
  background: var(--bg-sub);
}
.value-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.value-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}
.value-card::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(46, 124, 246, 0.2), transparent 70%);
  pointer-events: none;
}
.value-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 212, 255, 0.35);
  box-shadow: var(--glow-primary);
}
.value-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 21px;
  font-style: normal;
  margin-bottom: 22px;
  background: rgba(46, 124, 246, 0.15);
  border: 1px solid rgba(46, 124, 246, 0.35);
  color: var(--accent);
}
.value-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
}
.value-card p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ===== Materials section ===== */
.materials-section {
  background: var(--bg-main);
}
.materials-wrap {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 60px;
  align-items: center;
}
.materials-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.material-item {
  display: flex;
  gap: 16px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 22px 26px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.material-item:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--glow-primary);
}
.material-num {
  font-size: 24px;
  font-weight: 700;
  color: rgba(0, 212, 255, 0.4);
  line-height: 1.2;
  width: 36px;
  text-align: center;
  flex-shrink: 0;
}
.material-info h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}
.material-info p {
  font-size: 14px;
  color: var(--text-sub);
}
.materials-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 380px;
  border: 1px solid var(--line-accent);
}
.materials-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 380px;
}
.materials-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(7, 13, 26, 0.2), rgba(7, 13, 26, 0.65));
}

/* ===== Process section ===== */
.process-section {
  background: var(--bg-sub);
  position: relative;
  overflow: hidden;
}
.process-section::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -60px;
  transform: translateX(-50%);
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(46, 124, 246, 0.14), transparent 70%);
  pointer-events: none;
}
.process-steps {
  display: flex;
  gap: 0;
  counter-reset: step;
  flex-wrap: wrap;
}
.process-step {
  flex: 1;
  min-width: 220px;
  position: relative;
  padding: 36px 28px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  margin-right: 24px;
  transition: transform 0.3s ease, border-color 0.3s ease;
}
.process-step:last-child {
  margin-right: 0;
}
.process-step:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 255, 0.35);
}
.process-step::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  top: -16px;
  left: 26px;
  font-size: 15px;
  font-weight: 800;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.4);
}
.process-step h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 20px 0 10px;
}
.process-step p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}
.process-arrow {
  position: absolute;
  right: -25px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-size: 20px;
  z-index: 2;
  opacity: 0.6;
}

/* ===== Scenario section ===== */
.scenario-section {
  background: var(--bg-main);
}
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}
.scenario-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  display: block;
}
.scenario-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--glow-primary);
}
.scenario-media {
  position: relative;
  height: 160px;
  overflow: hidden;
}
.scenario-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.scenario-card:hover .scenario-media img {
  transform: scale(1.05);
}
.scenario-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(7, 13, 26, 0.85));
}
.scenario-tag {
  position: absolute;
  left: 16px;
  bottom: 14px;
  z-index: 2;
  padding: 4px 12px;
  border-radius: 6px;
  background: rgba(7, 13, 26, 0.7);
  border: 1px solid var(--line-accent);
  font-size: 12px;
  color: var(--accent);
  backdrop-filter: blur(6px);
}
.scenario-content {
  padding: 26px;
}
.scenario-content h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}
.scenario-content p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
}

/* ===== Security section ===== */
.security-section {
  background: var(--bg-sub);
  border-top: 1px solid var(--line-accent);
  border-bottom: 1px solid var(--line-accent);
}
.security-wrap {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.security-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 30px 26px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.security-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--glow-primary);
}
.security-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-style: normal;
  font-size: 19px;
  color: var(--accent);
  flex-shrink: 0;
}
.security-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}
.security-card p {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ===== FAQ ===== */
.faq-section {
  background: var(--bg-main);
}
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0;
  overflow: hidden;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.faq-item:hover {
  border-color: rgba(0, 212, 255, 0.25);
}
.faq-item.active {
  border-color: rgba(0, 212, 255, 0.4);
  box-shadow: var(--glow-primary);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 26px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  user-select: none;
}
.faq-icon {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-style: normal;
  font-size: 18px;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform 0.3s ease, background 0.3s ease;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--accent);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.faq-answer-inner {
  padding: 0 26px 22px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 16px;
  margin-top: 0;
}

/* ===== CTA ===== */
.cta-section {
  padding: 90px 0;
  background: linear-gradient(135deg, #0b1b36 0%, #070d1a 100%);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(0, 212, 255, 0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(0, 212, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}
.cta-panel {
  max-width: 880px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
  background: var(--bg-panel);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: 24px;
  padding: 60px 50px;
  text-align: center;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), var(--glow-primary);
}
.cta-panel h2 {
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 16px;
}
.cta-panel p {
  color: var(--text-sub);
  font-size: 15px;
  max-width: 560px;
  margin: 0 auto 34px;
  line-height: 1.8;
}
.cta-panel .btn {
  padding: 16px 52px;
  font-size: 16px;
  border-radius: 14px;
}

/* ===== Footer ===== */
.site-footer {
  background: #040a16;
  border-top: 1px solid var(--line-accent);
  padding-top: 0;
}
.footer-accent {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  width: 100%;
}
.footer-content {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 50px;
  padding-top: 64px;
  padding-bottom: 40px;
}
.footer-brand .footer-logo {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  display: inline-block;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-weak);
  line-height: 1.8;
  max-width: 300px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--text-main);
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 10px;
  line-height: 1.6;
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-col a:hover {
  color: var(--accent);
  padding-left: 4px;
}
.footer-col p {
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 8px;
  line-height: 1.6;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 22px 0;
  text-align: center;
}
.footer-bottom .container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
}
.footer-bottom span {
  font-size: 12px;
  color: var(--text-weak);
}

/* ===== Responsive ===== */
@media (max-width: 1199px) {
  .value-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .scenario-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .security-wrap {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-content {
    gap: 35px;
  }
}
@media (max-width: 991px) {
  :root {
    --space-section: 72px;
  }
  .brand-text {
    font-size: 17px;
  }
  .main-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    width: min(340px, 85vw);
    background: rgba(7, 13, 26, 0.97);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-left: 1px solid var(--line-accent);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 4px;
    padding: 30px 28px;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.23, 1, 0.32, 1);
    z-index: 999;
  }
  .main-nav.open {
    transform: translateX(0);
  }
  .main-nav .nav-link {
    font-size: 16px;
    padding: 14px 12px;
    border-radius: 10px;
  }
  .main-nav .nav-link::after {
    display: none;
  }
  .main-nav .nav-link.active {
    background: rgba(0, 212, 255, 0.08);
  }
  .nav-cta {
    margin: 16px 0 0;
    justify-content: center;
  }
  .nav-toggle {
    display: flex;
  }
  .materials-wrap {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .materials-media {
    min-height: 300px;
  }
  .materials-media img {
    min-height: 300px;
  }
}
@media (max-width: 767px) {
  :root {
    --space-section: var(--space-section-mobile);
    --header-h: 64px;
  }
  .container {
    padding: 0 16px;
  }
  .brand-icon {
    width: 30px;
    height: 30px;
  }
  .brand-text {
    font-size: 16px;
  }
  .nav-cta {
    display: none;
  }
  .cat-hero {
    min-height: 420px;
    margin-top: var(--header-h);
  }
  .cat-hero-inner {
    padding: 60px 18px;
  }
  .cat-hero h1 {
    font-size: 30px;
  }
  .cat-hero p {
    font-size: 15px;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
    max-width: 280px;
    margin: 0 auto;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .hero-trust {
    gap: 16px;
    margin-top: 30px;
  }
  .value-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .value-card {
    padding: 26px 22px;
  }
  .process-steps {
    flex-direction: column;
    gap: 20px;
  }
  .process-step {
    margin-right: 0;
    padding: 30px 22px;
  }
  .process-step::before {
    top: -14px;
    left: 20px;
  }
  .process-arrow {
    display: none;
  }
  .scenario-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .security-wrap {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .security-card {
    padding: 24px 20px;
  }
  .faq-question {
    font-size: 14px;
    padding: 16px 18px;
  }
  .faq-answer-inner {
    padding: 0 18px 18px;
    font-size: 13px;
  }
  .cta-panel {
    padding: 40px 24px;
    border-radius: 16px;
  }
  .cta-panel .btn {
    width: 100%;
    max-width: 300px;
  }
  .footer-content {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-top: 48px;
  }
  .footer-bottom .container {
    flex-direction: column;
    gap: 6px;
  }
}
@media (max-width: 520px) {
  .cat-hero h1 {
    font-size: 26px;
  }
  .brand-text {
    font-size: 15px;
  }
  .material-item {
    flex-direction: column;
    gap: 8px;
    padding: 18px;
  }
  .materials-media {
    min-height: 220px;
  }
  .materials-media img {
    min-height: 220px;
  }
}

/* roulang page: category3 */
:root {
      --bg-dark: #070D1A;
      --bg-deep: #0B1420;
      --bg-panel: rgba(255, 255, 255, 0.06);
      --bg-panel-strong: rgba(255, 255, 255, 0.09);
      --border-light: rgba(255, 255, 255, 0.12);
      --border-glow: rgba(0, 212, 255, 0.25);
      --primary-blue: #2E7CF6;
      --accent-cyan: #00D4FF;
      --accent-gold: #F0B54A;
      --text-main: #EAF0F8;
      --text-secondary: #8FA3BF;
      --text-dim: #566A85;
      --success: #34D399;
      --error: #F87171;
      --warning: #FBBF24;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35);
      --shadow-glow: 0 0 24px rgba(0, 212, 255, 0.15);
      --font-stack: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
      --container-max: 1200px;
      --space-section: 104px;
    }

    *,
    *::before,
    *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-stack);
      background: var(--bg-dark);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }

    img {
      display: block;
      max-width: 100%;
    }

    a {
      color: #38BDF8;
      text-decoration: none;
      transition: color 0.25s ease;
    }

    a:hover {
      color: var(--accent-cyan);
    }

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }

    input,
    select,
    textarea {
      font-family: inherit;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 100;
      background: rgba(7, 13, 26, 0.85);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(0, 212, 255, 0.18);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .site-header.scrolled {
      background: rgba(5, 10, 20, 0.95);
      box-shadow: 0 4px 30px rgba(0, 0, 0, 0.45);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      gap: 24px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .brand-icon {
      width: 32px;
      height: 32px;
      border-radius: 9px;
      background: linear-gradient(135deg, #2E7CF6, #00D4FF);
      box-shadow: 0 0 16px rgba(0, 212, 255, 0.35);
      position: relative;
      flex-shrink: 0;
    }

    .brand-icon::after {
      content: "";
      position: absolute;
      inset: 4px;
      border-radius: 6px;
      background: rgba(7, 13, 26, 0.85);
      border: 1px solid rgba(255, 255, 255, 0.15);
    }

    .brand-text {
      font-size: 19px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: 0.2px;
      white-space: nowrap;
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-link {
      position: relative;
      color: #C7D4EA;
      font-size: 15px;
      font-weight: 500;
      padding: 8px 2px;
      transition: color 0.25s ease;
    }

    .nav-link::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: 100%;
      height: 2px;
      background: var(--accent-cyan);
      border-radius: 2px;
      box-shadow: 0 0 10px rgba(0, 212, 255, 0.6);
      transform: scaleX(0);
      transform-origin: center;
      transition: transform 0.3s ease;
    }

    .nav-link:hover {
      color: var(--accent-cyan);
    }

    .nav-link:hover::after {
      transform: scaleX(1);
    }

    .nav-link.active {
      color: var(--accent-cyan);
    }

    .nav-link.active::after {
      transform: scaleX(1);
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-md);
      font-size: 15px;
      font-weight: 600;
      padding: 12px 28px;
      transition: all 0.3s ease;
      text-align: center;
      line-height: 1.4;
    }

    .btn-primary {
      background: linear-gradient(135deg, #2E7CF6, #00D4FF);
      color: #fff;
      box-shadow: 0 4px 18px rgba(46, 124, 246, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 28px rgba(0, 212, 255, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.25);
      color: #fff;
      filter: brightness(1.08);
    }

    .btn-primary:active {
      transform: translateY(0);
      filter: brightness(0.9);
    }

    .btn-outline {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.18);
      color: #C7D4EA;
      backdrop-filter: blur(12px);
    }

    .btn-outline:hover {
      border-color: rgba(0, 212, 255, 0.55);
      box-shadow: 0 0 20px rgba(0, 212, 255, 0.12);
      color: var(--accent-cyan);
      transform: translateY(-2px);
    }

    .nav-cta {
      height: 40px;
      padding: 0 20px;
      font-size: 14px;
    }

    .nav-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      padding: 8px;
      border-radius: 8px;
      border: 1px solid rgba(255, 255, 255, 0.12);
    }

    .nav-toggle span {
      width: 22px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: transform 0.3s ease, opacity 0.3s ease;
    }

    .nav-toggle.open span:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }

    .nav-toggle.open span:nth-child(2) {
      opacity: 0;
    }

    .nav-toggle.open span:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }

    .page-hero {
      position: relative;
      min-height: 480px;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 160px 0 90px;
      overflow: hidden;
      background:
        linear-gradient(180deg, rgba(7, 13, 26, 0.82), rgba(7, 13, 26, 0.92)),
        url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
    }

    .page-hero::before {
      content: "";
      position: absolute;
      top: 50%;
      left: 50%;
      width: 640px;
      height: 640px;
      background: radial-gradient(circle, rgba(0, 212, 255, 0.16), transparent 65%);
      transform: translate(-50%, -50%);
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 780px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      border-radius: 999px;
      background: rgba(0, 212, 255, 0.1);
      border: 1px solid rgba(0, 212, 255, 0.3);
      font-size: 13px;
      color: var(--accent-cyan);
      letter-spacing: 0.5px;
      margin-bottom: 24px;
    }

    .hero-content h1 {
      font-size: clamp(36px, 5vw, 52px);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 18px;
      letter-spacing: 0.3px;
    }

    .hero-content h1 span {
      background: linear-gradient(135deg, #2E7CF6, #00D4FF);
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      color: var(--text-secondary);
      font-size: 16px;
      max-width: 640px;
      margin: 0 auto 36px;
      line-height: 1.8;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .hero-trust {
      display: flex;
      justify-content: center;
      gap: 24px;
      margin-top: 36px;
      flex-wrap: wrap;
    }

    .trust-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      color: var(--text-secondary);
    }

    .trust-item i {
      font-style: normal;
      color: var(--accent-gold);
      font-size: 15px;
    }

    .section {
      padding: var(--space-section) 0;
    }

    .section-dark {
      background: var(--bg-deep);
    }

    .section-head {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 56px;
    }

    .section-head h2 {
      font-size: clamp(28px, 4vw, 36px);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-head p {
      color: var(--text-secondary);
      font-size: 15px;
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-panel);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 36px 32px;
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .feature-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.4), transparent);
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      border-color: rgba(255, 255, 255, 0.25);
      box-shadow: var(--shadow-card), var(--shadow-glow);
    }

    .feature-card:hover::before {
      opacity: 1;
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      background: rgba(46, 124, 246, 0.12);
      border: 1px solid rgba(46, 124, 246, 0.3);
      color: var(--accent-cyan);
    }

    .feature-icon svg {
      width: 24px;
      height: 24px;
    }

    .feature-card h3 {
      font-size: 19px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .feature-card p {
      color: var(--text-secondary);
      font-size: 14px;
      line-height: 1.75;
    }

    .privacy-section {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }

    .privacy-image {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      min-height: 360px;
      background: var(--bg-deep);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
    }

    .privacy-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      position: absolute;
      inset: 0;
    }

    .privacy-image::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(7, 13, 26, 0.2), rgba(7, 13, 26, 0.55));
    }

    .privacy-content h2 {
      font-size: clamp(26px, 3.4vw, 34px);
      font-weight: 700;
      line-height: 1.35;
      margin-bottom: 14px;
    }

    .privacy-content>p {
      color: var(--text-secondary);
      margin-bottom: 28px;
      font-size: 15px;
    }

    .principles-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .principles-list li {
      display: flex;
      gap: 14px;
      align-items: flex-start;
      background: var(--bg-panel);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      padding: 18px 20px;
      transition: border-color 0.3s ease, background 0.3s ease;
    }

    .principles-list li:hover {
      border-color: rgba(0, 212, 255, 0.3);
      background: rgba(255, 255, 255, 0.08);
    }

    .principles-list .step-mark {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: rgba(0, 212, 255, 0.12);
      border: 1px solid rgba(0, 212, 255, 0.25);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 700;
      color: var(--accent-cyan);
      flex-shrink: 0;
      margin-top: 2px;
    }

    .principles-list .pr-text h4 {
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 4px;
    }

    .principles-list .pr-text p {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.65;
    }

    .flow-section {
      background: linear-gradient(180deg, var(--bg-dark), var(--bg-deep));
    }

    .flow-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      counter-reset: flow-counter;
    }

    .flow-step {
      position: relative;
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      text-align: center;
      transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    }

    .flow-step:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 212, 255, 0.3);
      box-shadow: 0 0 24px rgba(0, 212, 255, 0.1);
    }

    .flow-step .step-num {
      font-size: 48px;
      font-weight: 200;
      color: rgba(255, 255, 255, 0.18);
      line-height: 1;
      margin-bottom: 16px;
      transition: color 0.3s ease, text-shadow 0.3s ease;
    }

    .flow-step:hover .step-num {
      color: var(--accent-cyan);
      text-shadow: 0 0 18px rgba(0, 212, 255, 0.35);
    }

    .flow-step h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .flow-step p {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.65;
    }

    .flow-arrow {
      position: absolute;
      top: 50%;
      right: -16px;
      transform: translateY(-50%);
      color: rgba(255, 255, 255, 0.15);
      font-size: 18px;
      z-index: 2;
      pointer-events: none;
      display: none;
    }

    .flow-step:not(:last-child) .flow-arrow {
      display: block;
    }

    .stats-band {
      background: var(--bg-deep);
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      padding: 64px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }

    .stat-item {
      text-align: center;
      padding: 0 16px;
      position: relative;
    }

    .stat-item+.stat-item::before {
      content: "";
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      height: 52px;
      width: 1px;
      background: rgba(255, 255, 255, 0.08);
    }

    .stat-num {
      font-size: clamp(32px, 3.4vw, 48px);
      font-weight: 800;
      background: linear-gradient(135deg, #2E7CF6, #00D4FF);
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1.2;
      margin-bottom: 6px;
      text-shadow: 0 0 30px rgba(0, 212, 255, 0.1);
    }

    .stat-label {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .stat-desc {
      font-size: 13px;
      color: var(--text-secondary);
    }

    .stats-note {
      margin-top: 40px;
      text-align: center;
      font-size: 12px;
      color: var(--text-dim);
      letter-spacing: 0.3px;
    }

    .faq-section {
      padding: var(--space-section) 0;
    }

    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-panel);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.3s ease, box-shadow 0.3s ease;
    }

    .faq-item:hover {
      border-color: rgba(0, 212, 255, 0.2);
    }

    .faq-item.open {
      border-color: rgba(0, 212, 255, 0.3);
      box-shadow: 0 0 20px rgba(0, 212, 255, 0.06);
    }

    .faq-q {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 20px 24px;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      width: 100%;
      text-align: left;
      background: transparent;
      transition: color 0.2s ease;
    }

    .faq-q:hover {
      color: var(--accent-cyan);
    }

    .faq-icon {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      border: 1px solid rgba(255, 255, 255, 0.18);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      font-size: 16px;
      font-weight: 300;
      color: var(--text-secondary);
      transition: transform 0.3s ease, color 0.3s ease, border-color 0.3s ease;
    }

    .faq-item.open .faq-icon {
      transform: rotate(45deg);
      color: var(--accent-cyan);
      border-color: rgba(0, 212, 255, 0.4);
    }

    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }

    .faq-a-inner {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.75;
    }

    .cta-panel {
      position: relative;
      border-radius: 24px;
      padding: 64px 48px;
      text-align: center;
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.15);
      background:
        linear-gradient(135deg, rgba(46, 124, 246, 0.12), rgba(0, 212, 255, 0.06)),
        url('/assets/images/backpic/back-3.webp') center center / cover no-repeat;
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: var(--shadow-card);
    }

    .cta-panel::before {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(7, 13, 26, 0.55);
      border-radius: 24px;
      z-index: 0;
    }

    .cta-panel .cta-inner {
      position: relative;
      z-index: 1;
      max-width: 600px;
      margin: 0 auto;
    }

    .cta-panel h2 {
      font-size: clamp(26px, 3.4vw, 34px);
      font-weight: 700;
      margin-bottom: 14px;
      line-height: 1.35;
    }

    .cta-panel p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 28px;
    }

    .cta-actions {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .site-footer {
      background: var(--bg-deep);
      padding-top: 0;
      position: relative;
    }

    .footer-accent {
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.6), transparent);
      margin-bottom: 48px;
    }

    .footer-content {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 40px;
      padding-bottom: 48px;
    }

    .footer-logo {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      display: inline-block;
      margin-bottom: 12px;
    }

    .footer-brand p {
      color: var(--text-secondary);
      font-size: 14px;
      line-height: 1.7;
      max-width: 300px;
    }

    .footer-col h4 {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-col a {
      display: block;
      color: var(--text-secondary);
      font-size: 14px;
      margin-bottom: 10px;
      transition: color 0.2s ease, padding-left 0.2s ease;
    }

    .footer-col a:hover {
      color: var(--accent-cyan);
      padding-left: 4px;
    }

    .footer-col p {
      color: var(--text-secondary);
      font-size: 14px;
      margin-bottom: 8px;
      line-height: 1.6;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding: 20px 0;
      text-align: center;
    }

    .footer-bottom .container span {
      font-size: 12px;
      color: var(--text-dim);
    }

    .back-to-top {
      position: fixed;
      bottom: 20px;
      right: 20px;
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: rgba(7, 13, 26, 0.9);
      border: 1px solid rgba(0, 212, 255, 0.3);
      color: var(--accent-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      z-index: 99;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
      font-size: 18px;
      line-height: 1;
    }

    .back-to-top.visible {
      opacity: 1;
      visibility: visible;
    }

    .back-to-top:hover {
      transform: translateY(-4px);
      box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
    }

    .breadcrumb {
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      z-index: 90;
      background: rgba(7, 13, 26, 0.75);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      padding: 10px 0;
    }

    .breadcrumb .container {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      color: var(--text-dim);
    }

    .breadcrumb a {
      color: var(--text-dim);
    }

    .breadcrumb a:hover {
      color: var(--accent-cyan);
    }

    .breadcrumb .sep {
      color: rgba(255, 255, 255, 0.2);
    }

    .breadcrumb .current {
      color: #A5D8FF;
    }

    @media (max-width: 1199px) {
      .flow-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
      }

      .flow-step:nth-child(2) .flow-arrow {
        display: none;
      }

      .privacy-section {
        gap: 40px;
      }
    }

    @media (max-width: 991px) {
      :root {
        --space-section: 80px;
      }

      .main-nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(7, 13, 26, 0.96);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        flex-direction: column;
        align-items: flex-start;
        justify-content: flex-start;
        padding: 24px 32px 32px;
        gap: 20px;
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        visibility: hidden;
        transition: max-height 0.4s ease, opacity 0.3s ease, padding 0.3s ease;
        border-bottom: 1px solid rgba(0, 212, 255, 0.15);
      }

      .main-nav.open {
        max-height: 480px;
        opacity: 1;
        visibility: visible;
        padding-bottom: 40px;
      }

      .nav-link {
        font-size: 17px;
        width: 100%;
        padding: 10px 4px;
      }

      .nav-cta {
        margin-top: 12px;
        width: 100%;
        height: 48px;
      }

      .nav-toggle {
        display: flex;
        z-index: 110;
      }

      .privacy-section {
        grid-template-columns: 1fr;
      }

      .privacy-image {
        min-height: 300px;
        position: relative;
      }

      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px 16px;
      }

      .stat-item+.stat-item::before {
        display: none;
      }

      .footer-content {
        grid-template-columns: 1fr 1fr;
      }

      .footer-brand {
        grid-column: 1 / -1;
      }
    }

    @media (max-width: 767px) {
      :root {
        --space-section: 60px;
      }

      .container {
        padding: 0 16px;
      }

      .page-hero {
        min-height: 520px;
        padding: 130px 0 70px;
      }

      .hero-content h1 {
        font-size: 34px;
      }

      .hero-sub {
        font-size: 15px;
        padding: 0 8px;
      }

      .hero-actions {
        flex-direction: column;
        align-items: stretch;
        padding: 0 16px;
      }

      .hero-actions .btn {
        width: 100%;
      }

      .hero-trust {
        gap: 14px;
        padding: 0 8px;
      }

      .features-grid {
        grid-template-columns: 1fr;
      }

      .flow-grid {
        grid-template-columns: 1fr;
      }

      .flow-arrow {
        display: none !important;
      }

      .stats-grid {
        grid-template-columns: 1fr;
        gap: 28px;
      }

      .stat-item {
        padding: 0 8px;
      }

      .cta-panel {
        padding: 48px 20px;
        border-radius: 18px;
      }

      .cta-actions {
        flex-direction: column;
        align-items: stretch;
      }

      .cta-actions .btn {
        width: 100%;
      }

      .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
      }

      .footer-brand {
        grid-column: auto;
      }

      .faq-q {
        font-size: 14px;
        padding: 18px 16px;
      }

      .faq-a-inner {
        padding: 0 16px 18px;
        font-size: 14px;
      }
    }

    @media (max-width: 520px) {
      .brand-text {
        font-size: 16px;
      }

      .brand-icon {
        width: 28px;
        height: 28px;
      }

      .header-inner {
        height: 64px;
      }

      .breadcrumb {
        top: 64px;
      }

      .main-nav {
        top: 64px;
      }

      .privacy-image {
        min-height: 240px;
      }

      .feature-card {
        padding: 28px 20px;
      }

      .stat-num {
        font-size: 34px;
      }
    }