/* ===== Gate大门区块链交易平台 - 主样式表 ===== */
:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #1f2b47;
  --bg-dark: #0f0f23;
  --accent-orange: #f7931a;
  --accent-orange-light: #fba94d;
  --accent-purple: #6c63ff;
  --accent-purple-light: #8b84ff;
  --text-primary: #ffffff;
  --text-secondary: #b0b8cc;
  --text-muted: #7a8299;
  --border-color: #2a3350;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ===== Header & Navigation ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(26, 26, 46, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-orange), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}

.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-orange);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--accent-orange); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent-orange), var(--accent-orange-light));
  color: #fff !important;
  padding: 10px 24px;
  border-radius: 25px;
  font-weight: 700 !important;
  transition: var(--transition);
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(247, 147, 26, 0.4);
}
.nav-cta::after { display: none !important; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

/* ===== Hero Section ===== */
#hero {
  padding: 100px 24px 80px;
  text-align: center;
  background: radial-gradient(ellipse at 50% 0%, rgba(247,147,26,0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 50%, rgba(108,99,255,0.1) 0%, transparent 50%);
  position: relative;
  overflow: hidden;
}
#hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23f7931a' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  animation: bgScroll 60s linear infinite;
  pointer-events: none;
}
@keyframes bgScroll { 0% { transform: translate(0,0); } 100% { transform: translate(60px,60px); } }

.hero-inner { max-width: var(--max-width); margin: 0 auto; position: relative; z-index: 1; }

.hero-badge {
  display: inline-block;
  background: rgba(247,147,26,0.15);
  color: var(--accent-orange);
  padding: 8px 20px;
  border-radius: 25px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid rgba(247,147,26,0.3);
}

#hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.3;
  background: linear-gradient(135deg, var(--accent-orange), var(--accent-orange-light), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 36px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent-orange), var(--accent-orange-light));
  color: #fff;
  box-shadow: 0 4px 20px rgba(247,147,26,0.35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(247,147,26,0.5); }
.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}
.btn-secondary:hover { border-color: var(--accent-purple); color: var(--accent-purple); transform: translateY(-3px); }

.hero-image {
  margin-top: 50px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
}
.hero-image img { width: 100%; height: auto; }

/* ===== Section Common ===== */
.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-badge {
  display: inline-block;
  background: rgba(108,99,255,0.15);
  color: var(--accent-purple-light);
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* ===== Features Grid ===== */
#features { background: var(--bg-secondary); }

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-orange), var(--accent-purple));
  transform: scaleX(0);
  transition: var(--transition);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(108,99,255,0.15);
  border-color: var(--accent-purple);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
  background: rgba(247,147,26,0.12);
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===== Payment / Services ===== */
#services { background: var(--bg-primary); }

.payment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.payment-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}
.payment-item:hover {
  border-color: var(--accent-orange);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.payment-item .icon {
  font-size: 2rem;
  margin-bottom: 10px;
}

.payment-item span {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ===== CTA Section ===== */
#cta {
  text-align: center;
  background: linear-gradient(135deg, rgba(247,147,26,0.1), rgba(108,99,255,0.1));
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

#cta h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 12px;
}

#cta p {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

#cta .btn-primary {
  font-size: 1.1rem;
  padding: 16px 48px;
}

/* ===== About Page ===== */
.about-hero { background: var(--bg-secondary); text-align: center; padding: 80px 24px 40px; }

.timeline {
  max-width: 800px;
  margin: 60px auto;
  position: relative;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-orange), var(--accent-purple));
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
  padding-left: 40px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -33px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-orange);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 4px rgba(247,147,26,0.3);
}

.timeline-year {
  font-size: 0.85rem;
  color: var(--accent-orange);
  font-weight: 700;
  margin-bottom: 4px;
}

.timeline-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.timeline-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.team-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 20px;
  text-align: center;
  transition: var(--transition);
}
.team-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.team-card img {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto 16px;
  border: 3px solid var(--accent-orange);
}
.team-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.team-card .role { color: var(--accent-orange); font-size: 0.85rem; font-weight: 600; margin-bottom: 8px; }
.team-card .bio { color: var(--text-secondary); font-size: 0.9rem; }

.compliance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 40px;
}
.compliance-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px;
  transition: var(--transition);
}
.compliance-card:hover { border-color: var(--accent-purple); }
.compliance-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--accent-purple-light); }
.compliance-card p { color: var(--text-secondary); font-size: 0.9rem; }

/* ===== Services Page ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  transition: var(--transition);
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(108,99,255,0.15);
  border-color: var(--accent-purple);
}

.service-card .icon {
  font-size: 2.2rem;
  margin-bottom: 16px;
}

.service-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.service-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.service-card ul {
  list-style: disc;
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.service-card ul li { margin-bottom: 6px; }
.service-card ul li::marker { color: var(--accent-orange); }

/* ===== FAQ Page ===== */
.faq-list {
  max-width: 850px;
  margin: 0 auto;
}

.faq-category { margin-bottom: 48px; }
.faq-category h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent-orange);
  display: inline-block;
}

details {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  transition: var(--transition);
}
details:hover { border-color: var(--accent-purple); }
details[open] {
  border-color: var(--accent-orange);
  box-shadow: 0 4px 20px rgba(247,147,26,0.1);
}

summary {
  padding: 18px 24px;
  font-weight: 600;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  list-style: none;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--accent-orange);
  transition: var(--transition);
}
details[open] summary::after { content: '−'; }
details[open] summary { color: var(--accent-orange); }

.faq-answer {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
}

.faq-filter {
  margin-bottom: 36px;
  text-align: center;
}
.faq-filter input {
  width: 100%;
  max-width: 500px;
  padding: 14px 24px;
  border-radius: 30px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1rem;
  outline: none;
  transition: var(--transition);
}
.faq-filter input:focus { border-color: var(--accent-orange); box-shadow: 0 0 0 3px rgba(247,147,26,0.15); }
.faq-filter input::placeholder { color: var(--text-muted); }

/* ===== Contact Page ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 36px;
}

.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  font-size: 0.95rem;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent-orange);
  box-shadow: 0 0 0 3px rgba(247,147,26,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

.contact-info-side {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px;
  transition: var(--transition);
}
.info-card:hover { border-color: var(--accent-purple); }
.info-card h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.info-card p { color: var(--text-secondary); font-size: 0.95rem; }

.social-links { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.social-link {
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 25px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}
.social-link:hover {
  background: var(--accent-purple);
  color: #fff;
  border-color: var(--accent-purple);
}

/* ===== Stats Section ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.stat-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.stat-card:hover { border-color: var(--accent-orange); }

.stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-orange), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.stat-card .label { color: var(--text-secondary); font-size: 0.95rem; }

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-dark);
  border-top: 1px solid var(--border-color);
  padding: 48px 24px 24px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-col h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-col p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 8px; }
.footer-col a { color: var(--text-muted); font-size: 0.9rem; display: block; margin-bottom: 8px; transition: var(--transition); }
.footer-col a:hover { color: var(--accent-orange); }

.footer-bottom {
  max-width: var(--max-width);
  margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal { opacity: 0; transform: translateY(40px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .hamburger { display: flex; }

  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border-color);
    display: none;
  }
  .nav-links.active { display: flex; }

  .header-inner { height: 60px; }
  .logo { font-size: 1.3rem; }

  #hero { padding: 60px 20px 50px; }
  #hero h1 { font-size: 1.6rem; }

  .features-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .payment-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: 1fr; }
  .compliance-grid { grid-template-columns: 1fr; }

  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { margin-top: 20px; }

  .section-container { padding: 50px 16px; }
  .hero-actions { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
  .payment-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}