/* ========================================
   大门交易所 | 全球顶尖加密货币【官方网站】
   Gate Damen Exchange - Premium Crypto Theme
   ======================================== */

/* --- CSS Variables --- */
:root {
  --bg-deep: #0a0e17;
  --bg-card: #111827;
  --bg-card-hover: #1a2235;
  --gold: #d4a745;
  --gold-light: #f0cc6e;
  --gate-blue: #1a56db;
  --gate-blue-light: #3b82f6;
  --btc-orange: #f7931a;
  --eth-purple: #627eea;
  --xrp-cyan: #00aae4;
  --defi-green: #00d4aa;
  --white: #ffffff;
  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --border: #1f2937;
  --border-light: #374151;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 30px rgba(26,86,219,0.15);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg-deep);
  color:var(--text-primary);
  line-height:1.7;
  overflow-x:hidden;
  min-height:100vh;
}

a{color:inherit;text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--gold)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}

/* --- Utility --- */
.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* --- Animations --- */
@keyframes fadeInUp {
  from{opacity:0;transform:translateY(40px)}
  to{opacity:1;transform:translateY(0)}
}
@keyframes fadeIn {
  from{opacity:0}
  to{opacity:1}
}
@keyframes pulse {
  0%,100%{box-shadow:0 0 0 0 rgba(212,167,69,0.4)}
  50%{box-shadow:0 0 0 20px rgba(212,167,69,0)}
}
@keyframes gateOpen {
  0%{clip-path:inset(0 50% 0 50%)}
  100%{clip-path:inset(0 0 0 0)}
}
@keyframes floatUp {
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-10px)}
}
@keyframes shimmer {
  0%{background-position:-200% 0}
  100%{background-position:200% 0}
}
@keyframes coinFlip {
  0%{transform:rotateY(0deg)}
  100%{transform:rotateY(180deg)}
}
@keyframes slideInLeft {
  from{opacity:0;transform:translateX(-60px)}
  to{opacity:1;transform:translateX(0)}
}
@keyframes slideInRight {
  from{opacity:0;transform:translateX(60px)}
  to{opacity:1;transform:translateX(0)}
}

/* --- Scroll Reveal --- */
.reveal{opacity:0;transform:translateY(40px);transition:opacity 0.8s ease,transform 0.8s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-left{opacity:0;transform:translateX(-60px);transition:opacity 0.8s ease,transform 0.8s ease}
.reveal-left.visible{opacity:1;transform:translateX(0)}
.reveal-right{opacity:0;transform:translateX(60px);transition:opacity 0.8s ease,transform 0.8s ease}
.reveal-right.visible{opacity:1;transform:translateX(0)}

/* --- Header & Navigation --- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(10,14,23,0.85);backdrop-filter:blur(20px);
  border-bottom:1px solid rgba(212,167,69,0.12);
  transition:background var(--transition);
}
.site-header.scrolled{background:rgba(10,14,23,0.95)}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  max-width:var(--max-width);margin:0 auto;padding:0 24px;height:70px;
}
.logo{
  font-size:1.5rem;font-weight:800;color:var(--gold);
  display:flex;align-items:center;gap:8px;
  animation:gateOpen 1.2s ease-out 0.3s both;
}
.logo-icon{
  width:36px;height:36px;background:linear-gradient(135deg,var(--gold),var(--gold-light));
  border-radius:8px;display:flex;align-items:center;justify-content:center;
  font-size:1.2rem;color:var(--bg-deep);font-weight:900;
}
.nav-links{display:flex;align-items:center;gap:32px}
.nav-links a{
  font-size:0.95rem;font-weight:500;color:var(--text-secondary);
  position:relative;padding:4px 0;
  transition:color var(--transition);
}
.nav-links a::after{
  content:'';position:absolute;bottom:-2px;left:0;
  width:0;height:2px;background:var(--gold);
  transition:width var(--transition);
}
.nav-links a:hover,.nav-links a.active{color:var(--gold)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{
  background:linear-gradient(135deg,var(--gold),var(--gold-light));
  color:var(--bg-deep)!important;padding:10px 24px!important;
  border-radius:50px;font-weight:700!important;font-size:0.9rem!important;
  transition:transform var(--transition),box-shadow var(--transition)!important;
}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(212,167,69,0.3)}
.nav-cta::after{display:none!important}
.mobile-toggle{display:none;background:none;border:none;color:var(--white);font-size:1.6rem;cursor:pointer}

/* --- Hero Section --- */
.hero{
  min-height:100vh;display:flex;align-items:center;
  position:relative;overflow:hidden;padding:120px 0 80px;
}
.hero::before{
  content:'';position:absolute;top:0;left:0;right:0;bottom:0;
  background:radial-gradient(ellipse at 50% 0%,rgba(26,86,219,0.12) 0%,transparent 60%),
             radial-gradient(ellipse at 80% 20%,rgba(212,167,69,0.08) 0%,transparent 50%);
  pointer-events:none;
}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.hero-content{animation:fadeInUp 1s ease 0.2s both}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(212,167,69,0.1);border:1px solid rgba(212,167,69,0.25);
  padding:8px 20px;border-radius:50px;font-size:0.85rem;color:var(--gold);
  margin-bottom:24px;
}
.hero-badge .dot{width:8px;height:8px;background:var(--gold);border-radius:50%;animation:pulse 2s infinite}
.hero h1{
  font-size:3.5rem;font-weight:900;line-height:1.15;margin-bottom:20px;
  background:linear-gradient(135deg,var(--white) 0%,var(--gold) 50%,var(--gold-light) 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero-subtitle{font-size:1.15rem;color:var(--text-secondary);margin-bottom:32px;max-width:500px}
.hero-stats{display:flex;gap:40px;margin-bottom:36px}
.hero-stat{text-align:center}
.hero-stat-value{font-size:2rem;font-weight:800;color:var(--gold)}
.hero-stat-label{font-size:0.8rem;color:var(--text-muted);margin-top:4px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-visual{position:relative;animation:fadeIn 1.2s ease 0.5s both}
.hero-visual img{border-radius:var(--radius-lg);box-shadow:var(--shadow-glow)}
.hero-floating-coins{position:absolute;inset:0;pointer-events:none}
.float-coin{
  position:absolute;width:48px;height:48px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:0.7rem;color:var(--white);
  animation:floatUp 3s ease-in-out infinite;
}
.float-coin.btc{background:rgba(247,147,26,0.2);border:1px solid var(--btc-orange);top:10%;right:10%;animation-delay:0s}
.float-coin.eth{background:rgba(98,126,234,0.2);border:1px solid var(--eth-purple);top:60%;left:5%;animation-delay:0.8s}
.float-coin.xrp{background:rgba(0,170,228,0.2);border:1px solid var(--xrp-cyan);bottom:15%;right:20%;animation-delay:1.6s}
.float-coin.defi{background:rgba(0,212,170,0.2);border:1px solid var(--defi-green);top:30%;left:10%;animation-delay:2.4s}

/* --- Buttons --- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 32px;border-radius:50px;font-size:1rem;
  font-weight:700;cursor:pointer;border:none;
  transition:all var(--transition);text-align:center;
}
.btn-primary{
  background:linear-gradient(135deg,var(--gold),var(--gold-light));
  color:var(--bg-deep);animation:pulse 2.5s infinite;
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 12px 40px rgba(212,167,69,0.35);color:var(--bg-deep)}
.btn-secondary{
  background:transparent;color:var(--gold);
  border:2px solid var(--gold);
}
.btn-secondary:hover{background:rgba(212,167,69,0.1);transform:translateY(-3px)}
.btn-gate-blue{
  background:linear-gradient(135deg,var(--gate-blue),var(--gate-blue-light));
  color:var(--white);
}
.btn-gate-blue:hover{transform:translateY(-3px);box-shadow:0 12px 40px rgba(26,86,219,0.35)}

/* --- Section --- */
.section{padding:100px 0}
.section-header{text-align:center;margin-bottom:60px}
.section-tag{
  display:inline-block;color:var(--gold);font-size:0.85rem;
  font-weight:600;text-transform:uppercase;letter-spacing:2px;
  margin-bottom:12px;
}
.section h2{font-size:2.5rem;font-weight:800;color:var(--white);margin-bottom:16px}
.section-desc{font-size:1.1rem;color:var(--text-secondary);max-width:600px;margin:0 auto}

/* --- Coin Showcase --- */
.coin-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.coin-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:32px 24px;text-align:center;
  transition:all 0.5s ease;position:relative;overflow:hidden;
  perspective:800px;
}
.coin-card:hover{transform:translateY(-8px);border-color:var(--gold);box-shadow:0 16px 48px rgba(0,0,0,0.5)}
.coin-card-inner{transition:transform 0.6s ease;transform-style:preserve-3d}
.coin-card:hover .coin-card-inner{transform:rotateY(180deg)}
.coin-card-front,.coin-card-back{
  backface-visibility:hidden;
}
.coin-card-back{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  transform:rotateY(180deg);background:var(--bg-card-hover);border-radius:var(--radius-lg);
  padding:20px;
}
.coin-icon{
  width:64px;height:64px;border-radius:50%;margin:0 auto 16px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.8rem;font-weight:900;
}
.coin-icon.btc{background:rgba(247,147,26,0.15);color:var(--btc-orange)}
.coin-icon.eth{background:rgba(98,126,234,0.15);color:var(--eth-purple)}
.coin-icon.xrp{background:rgba(0,170,228,0.15);color:var(--xrp-cyan)}
.coin-icon.defi{background:rgba(0,212,170,0.15);color:var(--defi-green)}
.coin-card h3{font-size:1.3rem;font-weight:700;color:var(--white);margin-bottom:4px}
.coin-card .coin-symbol{font-size:0.85rem;color:var(--text-muted);margin-bottom:12px}
.coin-price{font-size:1.5rem;font-weight:800;color:var(--gold);margin-bottom:8px}
.coin-change{font-size:0.9rem;font-weight:600}
.coin-change.up{color:var(--defi-green)}
.coin-change.down{color:#ef4444}

/* --- Advantages --- */
.advantages-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.adv-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:40px 28px;
  transition:all var(--transition);position:relative;overflow:hidden;
}
.adv-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--gold),var(--gate-blue),var(--defi-green));
  transform:scaleX(0);transition:transform 0.5s ease;
}
.adv-card:hover::before{transform:scaleX(1)}
.adv-card:hover{transform:translateY(-6px);border-color:var(--gold);box-shadow:0 16px 48px rgba(0,0,0,0.4)}
.adv-icon{
  width:56px;height:56px;border-radius:var(--radius-sm);
  display:flex;align-items:center;justify-content:center;
  font-size:1.5rem;margin-bottom:20px;
  background:rgba(212,167,69,0.1);color:var(--gold);
}
.adv-card h3{font-size:1.2rem;font-weight:700;color:var(--white);margin-bottom:10px}
.adv-card p{font-size:0.95rem;color:var(--text-secondary);line-height:1.6}

/* --- Timeline --- */
.timeline{position:relative;padding:20px 0}
.timeline::before{
  content:'';position:absolute;left:50%;top:0;bottom:0;
  width:2px;background:linear-gradient(to bottom,var(--gold),var(--gate-blue),var(--defi-green));
  transform:translateX(-50%);
}
.timeline-item{display:flex;align-items:flex-start;margin-bottom:48px;position:relative}
.timeline-item:nth-child(odd){flex-direction:row}
.timeline-item:nth-child(even){flex-direction:row-reverse}
.timeline-dot{
  position:absolute;left:50%;top:0;transform:translateX(-50%);
  width:16px;height:16px;background:var(--gold);border-radius:50%;
  border:3px solid var(--bg-deep);z-index:2;
}
.timeline-content{
  width:45%;padding:24px;background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);transition:all var(--transition);
}
.timeline-content:hover{border-color:var(--gold)}
.timeline-year{font-size:1.4rem;font-weight:800;color:var(--gold);margin-bottom:8px}
.timeline-content h4{font-size:1.05rem;color:var(--white);margin-bottom:6px}
.timeline-content p{font-size:0.9rem;color:var(--text-secondary)}

/* --- Hot Pairs --- */
.pairs-table{width:100%;border-collapse:collapse}
.pairs-table th{
  text-align:left;padding:14px 20px;font-size:0.85rem;color:var(--text-muted);
  font-weight:600;text-transform:uppercase;border-bottom:1px solid var(--border);
}
.pairs-table td{
  padding:14px 20px;border-bottom:1px solid var(--border);
  font-size:0.95rem;color:var(--white);
}
.pairs-table tr{transition:background var(--transition)}
.pairs-table tbody tr:hover{background:var(--bg-card-hover)}
.pair-name{display:flex;align-items:center;gap:10px;font-weight:600}
.pair-dot{width:10px;height:10px;border-radius:50%}
.pair-dot.btc{background:var(--btc-orange)}
.pair-dot.eth{background:var(--eth-purple)}
.pair-dot.xrp{background:var(--xrp-cyan)}
.pair-dot.defi{background:var(--defi-green)}
.price-up{color:var(--defi-green)}
.price-down{color:#ef4444}

/* --- CTA Section --- */
.cta-section{
  background:linear-gradient(135deg,rgba(26,86,219,0.08),rgba(212,167,69,0.08));
  border-top:1px solid var(--border);border-bottom:1px solid var(--border);
}
.cta-inner{text-align:center;max-width:700px;margin:0 auto}
.cta-inner h2{font-size:2.2rem;font-weight:800;color:var(--white);margin-bottom:16px}
.cta-inner p{font-size:1.1rem;color:var(--text-secondary);margin-bottom:40px}
.cta-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* --- Footer --- */
.site-footer{
  background:var(--bg-card);border-top:1px solid var(--border);
  padding:60px 0 30px;
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand h3{font-size:1.3rem;color:var(--gold);margin-bottom:12px}
.footer-brand p{font-size:0.9rem;color:var(--text-secondary);line-height:1.6}
.footer-col h4{font-size:1rem;color:var(--white);margin-bottom:16px}
.footer-col a{display:block;font-size:0.9rem;color:var(--text-secondary);margin-bottom:10px;transition:color var(--transition)}
.footer-col a:hover{color:var(--gold)}
.footer-bottom{
  text-align:center;padding-top:24px;border-top:1px solid var(--border);
  font-size:0.85rem;color:var(--text-muted);
}

/* --- Page Hero (Sub Pages) --- */
.page-hero{
  padding:140px 0 80px;text-align:center;
  background:radial-gradient(ellipse at 50% 0%,rgba(26,86,219,0.10) 0%,transparent 60%);
}
.page-hero h1{font-size:3rem;font-weight:900;color:var(--gold);margin-bottom:16px}
.page-hero .breadcrumb{font-size:0.9rem;color:var(--text-muted)}
.page-hero .breadcrumb a{color:var(--text-secondary)}
.page-hero .breadcrumb a:hover{color:var(--gold)}

/* --- About Page --- */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.about-content h2{font-size:2rem;font-weight:800;color:var(--white);margin-bottom:20px}
.about-content p{font-size:1.05rem;color:var(--text-secondary);margin-bottom:16px;line-height:1.8}
.stats-row{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:32px}
.stat-box{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:24px 16px;text-align:center;
}
.stat-box .num{font-size:1.8rem;font-weight:800;color:var(--gold)}
.stat-box .lbl{font-size:0.8rem;color:var(--text-muted);margin-top:4px}

/* --- Services Page --- */
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.service-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:36px 28px;
  transition:all var(--transition);position:relative;
}
.service-card:hover{transform:translateY(-8px);border-color:var(--gold);box-shadow:var(--shadow-glow)}
.service-icon{
  width:60px;height:60px;border-radius:var(--radius-sm);
  display:flex;align-items:center;justify-content:center;
  font-size:1.6rem;margin-bottom:20px;
  background:rgba(212,167,69,0.1);color:var(--gold);
}
.service-card h3{font-size:1.2rem;font-weight:700;color:var(--white);margin-bottom:12px}
.service-card p{font-size:0.95rem;color:var(--text-secondary);line-height:1.6}

/* --- FAQ Page --- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);margin-bottom:12px;
  transition:all var(--transition);overflow:hidden;
}
.faq-item:hover{border-color:var(--gold)}
.faq-item summary{
  padding:20px 24px;font-size:1.05rem;font-weight:600;color:var(--white);
  cursor:pointer;display:flex;align-items:center;justify-content:space-between;
  list-style:none;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:'+';font-size:1.5rem;color:var(--gold);transition:transform var(--transition);
}
.faq-item[open] summary::after{content:'−';transform:rotate(180deg)}
.faq-item .faq-answer{
  padding:0 24px 20px;font-size:0.95rem;color:var(--text-secondary);line-height:1.7;
}

/* --- Contact Page --- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.contact-info h2{font-size:1.8rem;font-weight:800;color:var(--white);margin-bottom:16px}
.contact-info p{color:var(--text-secondary);margin-bottom:32px}
.contact-method{display:flex;align-items:flex-start;gap:16px;margin-bottom:24px}
.contact-method-icon{
  width:48px;height:48px;background:rgba(212,167,69,0.1);
  border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;
  font-size:1.2rem;color:var(--gold);flex-shrink:0;
}
.contact-method h4{font-size:1rem;color:var(--white);margin-bottom:4px}
.contact-method span{font-size:0.9rem;color:var(--text-secondary)}
.contact-form{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:40px}
.contact-form h3{font-size:1.3rem;font-weight:700;color:var(--white);margin-bottom:24px}
.form-group{margin-bottom:20px}
.form-group label{display:block;font-size:0.9rem;color:var(--text-secondary);margin-bottom:8px}
.form-group input,.form-group textarea,.form-group select{
  width:100%;padding:14px 18px;background:var(--bg-deep);
  border:1px solid var(--border-light);border-radius:var(--radius-sm);
  color:var(--white);font-size:0.95rem;transition:border-color var(--transition);
  font-family:inherit;
}
.form-group input:focus,.form-group textarea:focus,.form-group select:focus{
  outline:none;border-color:var(--gold);
}
.form-group textarea{min-height:140px;resize:vertical}

/* --- Responsive --- */
@media(max-width:1024px){
  .coin-grid{grid-template-columns:repeat(2,1fr)}
  .advantages-grid{grid-template-columns:repeat(2,1fr)}
  .services-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .hero-grid{grid-template-columns:1fr;text-align:center}
  .hero-stats{justify-content:center}
  .hero-btns{justify-content:center}
  .hero h1{font-size:2.2rem}
  .hero-visual{order:-1;max-width:320px;margin:0 auto}
  .nav-links{display:none;position:absolute;top:70px;left:0;right:0;
    background:rgba(10,14,23,0.98);flex-direction:column;padding:20px;
    border-bottom:1px solid var(--border);
  }
  .nav-links.active{display:flex}
  .mobile-toggle{display:block}
  .coin-grid{grid-template-columns:1fr;max-width:320px;margin:0 auto}
  .advantages-grid{grid-template-columns:1fr}
  .services-grid{grid-template-columns:1fr}
  .about-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .timeline::before{left:20px}
  .timeline-item,.timeline-item:nth-child(even){flex-direction:row}
  .timeline-dot{left:20px}
  .timeline-content{width:calc(100% - 50px);margin-left:50px}
  .stats-row{grid-template-columns:repeat(3,1fr)}
  .section h2{font-size:1.8rem}
  .page-hero h1{font-size:2rem}
}
@media(max-width:480px){
  .hero h1{font-size:1.8rem}
  .hero-stats{gap:20px}
  .hero-stat-value{font-size:1.4rem}
  .stats-row{grid-template-columns:repeat(2,1fr)}
  .cta-btns{flex-direction:column;align-items:center}
}