/* ===== 欧义 - 全球领先的数字资产交易平台 ===== */
/* 配色：深色背景(#0b1426) + 金橙主色(#f0a500) + 科技蓝(#1e90ff) + 白色 */

:root {
  --bg-primary: #0b1426;
  --bg-secondary: #111d35;
  --bg-card: #162240;
  --bg-card-hover: #1c2d52;
  --gold: #f0a500;
  --gold-light: #f7c948;
  --gold-glow: rgba(240, 165, 0, 0.3);
  --blue: #1e90ff;
  --blue-glow: rgba(30, 144, 255, 0.25);
  --white: #ffffff;
  --text-primary: #e8ecf1;
  --text-secondary: #a0aec0;
  --text-muted: #6b7c93;
  --border: #1e3254;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-gold: 0 4px 24px rgba(240, 165, 0, 0.2);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

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

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

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ===== Header & Navigation ===== */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(11, 20, 38, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1280px; margin: 0 auto; padding: 0 24px; height: 72px;
}

.brand {
  font-size: 1.5rem; font-weight: 800;
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.5px;
}

.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  font-size: 0.95rem; color: var(--text-secondary); position: relative;
  padding: 4px 0; font-weight: 500;
}
.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 { color: var(--white); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  background: linear-gradient(135deg, var(--gold) 0%, #d48a00 100%);
  color: #0b1426 !important; padding: 10px 22px !important;
  border-radius: 50px; font-weight: 700 !important;
  box-shadow: var(--shadow-gold); transition: all var(--transition) !important;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 32px rgba(240, 165, 0, 0.35) !important; }
.nav-cta::after { display: none !important; }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { width: 26px; height: 2px; background: var(--white); border-radius: 2px; transition: var(--transition); }

/* ===== Hero Section ===== */
.hero {
  padding: 100px 0 80px; position: relative; overflow: hidden;
  background: radial-gradient(ellipse at 30% top, rgba(240, 165, 0, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% bottom, rgba(30, 144, 255, 0.06) 0%, transparent 60%);
}

.hero .container {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}

.hero-content h1 {
  font-size: 3rem; font-weight: 900; line-height: 1.25; margin-bottom: 20px;
  background: linear-gradient(135deg, var(--white) 30%, var(--gold-light) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero-content p {
  font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 32px; max-width: 520px;
}

.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px;
  border-radius: 50px; font-size: 1rem; font-weight: 700; cursor: pointer;
  transition: all var(--transition); border: none; text-align: center;
}

.btn-gold {
  background: linear-gradient(135deg, var(--gold) 0%, #d48a00 100%);
  color: #0b1426; box-shadow: var(--shadow-gold);
}
.btn-gold:hover { transform: translateY(-3px); box-shadow: 0 8px 36px rgba(240, 165, 0, 0.4); }

.btn-outline {
  background: transparent; color: var(--white);
  border: 2px solid var(--border);
}
.btn-outline:hover { border-color: var(--gold); color: var(--gold); transform: translateY(-3px); }

.hero-image { display: flex; justify-content: center; align-items: center; }
.hero-image img { border-radius: var(--radius); box-shadow: 0 8px 48px rgba(30, 144, 255, 0.12); }

/* ===== Section Common ===== */
.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 {
  font-size: 2.2rem; font-weight: 800; margin-bottom: 12px;
  background: linear-gradient(135deg, var(--white) 30%, var(--gold-light) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.section-header p { color: var(--text-secondary); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

/* ===== Features Grid ===== */
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}

.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px 28px;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--blue));
  opacity: 0; transition: opacity var(--transition);
}
.feature-card:hover {
  background: var(--bg-card-hover); transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4); border-color: var(--gold);
}
.feature-card:hover::before { opacity: 1; }

.feature-icon {
  width: 56px; height: 56px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(240, 165, 0, 0.15), rgba(30, 144, 255, 0.1));
  display: flex; align-items: center; justify-content: center; margin-bottom: 20px;
  font-size: 1.6rem;
}

.feature-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; color: var(--white); }
.feature-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }

/* ===== Stats Section ===== */
.stats { background: var(--bg-secondary); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; text-align: center; }

.stat-item { padding: 32px 16px; }
.stat-number {
  font-size: 2.8rem; font-weight: 900;
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-label { color: var(--text-secondary); font-size: 1rem; margin-top: 8px; }

/* ===== CTA Section ===== */
.cta-section {
  background: radial-gradient(ellipse at center, rgba(240, 165, 0, 0.1) 0%, transparent 70%);
  text-align: center; padding: 80px 0;
}
.cta-section h2 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.cta-section p { color: var(--text-secondary); font-size: 1.05rem; margin-bottom: 32px; }
.cta-section .btn { font-size: 1.1rem; padding: 16px 40px; }

/* ===== Security Section ===== */
.security-showcase {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px;
}
.security-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 28px;
  display: flex; gap: 20px; align-items: flex-start;
  transition: all var(--transition);
}
.security-item:hover { border-color: var(--blue); background: var(--bg-card-hover); }
.security-icon {
  flex-shrink: 0; width: 48px; height: 48px; border-radius: 50%;
  background: rgba(30, 144, 255, 0.12); display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
}
.security-item h3 { font-size: 1.1rem; font-weight: 700; color: var(--white); margin-bottom: 6px; }
.security-item p { color: var(--text-secondary); font-size: 0.93rem; }

/* ===== Page Hero (subpages) ===== */
.page-hero {
  padding: 80px 0 60px; text-align: center;
  background: radial-gradient(ellipse at 30% top, rgba(240, 165, 0, 0.06) 0%, transparent 60%),
              radial-gradient(ellipse at 70% bottom, rgba(30, 144, 255, 0.05) 0%, transparent 60%);
}
.page-hero h1 {
  font-size: 2.6rem; font-weight: 900; margin-bottom: 16px;
  background: linear-gradient(135deg, var(--white) 30%, var(--gold-light) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.page-hero p { color: var(--text-secondary); font-size: 1.1rem; max-width: 640px; margin: 0 auto; }

/* ===== Timeline ===== */
.timeline { position: relative; max-width: 720px; margin: 0 auto; padding: 20px 0; }
.timeline::before {
  content: ''; position: absolute; left: 20px; top: 0; bottom: 0; width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--blue), transparent);
}
.timeline-item { position: relative; padding: 0 0 32px 56px; }
.timeline-item::before {
  content: ''; position: absolute; left: 12px; top: 4px; width: 18px; height: 18px;
  border-radius: 50%; background: var(--gold); box-shadow: 0 0 12px var(--gold-glow);
}
.timeline-year { font-size: 0.9rem; font-weight: 700; color: var(--gold); margin-bottom: 4px; }
.timeline-item h3 { font-size: 1.1rem; color: var(--white); margin-bottom: 6px; }
.timeline-item p { color: var(--text-secondary); font-size: 0.93rem; }

/* ===== Team Grid ===== */
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.team-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 20px; text-align: center; transition: all var(--transition); }
.team-card:hover { transform: translateY(-4px); border-color: var(--gold); box-shadow: var(--shadow-gold); }
.team-card img { width: 88px; height: 88px; border-radius: 50%; margin: 0 auto 16px; border: 3px solid var(--border); }
.team-card h3 { font-size: 1.05rem; color: var(--white); margin-bottom: 4px; }
.team-card .role { color: var(--gold); font-size: 0.85rem; font-weight: 600; margin-bottom: 8px; }
.team-card p { color: var(--text-secondary); font-size: 0.85rem; }

/* ===== Compliance Grid ===== */
.compliance-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.compliance-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 24px; display: flex; gap: 14px; align-items: flex-start; transition: all var(--transition);
}
.compliance-card:hover { border-color: var(--blue); }
.compliance-badge { flex-shrink: 0; width: 44px; height: 44px; border-radius: 50%;
  background: rgba(30, 144, 255, 0.12); display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; }
.compliance-card h3 { font-size: 1rem; color: var(--white); margin-bottom: 4px; }
.compliance-card p { color: var(--text-secondary); font-size: 0.85rem; }

/* ===== Services Grid ===== */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.service-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 36px 28px; transition: all var(--transition); position: relative; overflow: hidden;
}
.service-card::after {
  content: ''; position: absolute; inset: 0; border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(240, 165, 0, 0.05), rgba(30, 144, 255, 0.03));
  opacity: 0; transition: opacity var(--transition);
}
.service-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4); border-color: var(--gold); }
.service-card:hover::after { opacity: 1; }
.service-icon { font-size: 2rem; margin-bottom: 16px; }
.service-card h3 { font-size: 1.2rem; color: var(--white); margin-bottom: 10px; }
.service-card p { color: var(--text-secondary); font-size: 0.93rem; line-height: 1.7; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }

.faq-category { margin-bottom: 32px; }
.faq-category h2 { font-size: 1.5rem; font-weight: 700; color: var(--gold); margin-bottom: 16px; padding-bottom: 8px;
  border-bottom: 1px solid var(--border); }

.faq-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; transition: all var(--transition); }
.faq-item:hover { border-color: var(--blue); }

.faq-item summary {
  padding: 20px 24px; font-weight: 700; font-size: 1.02rem; cursor: pointer;
  color: var(--white); display: flex; justify-content: space-between; align-items: center;
  user-select: none; transition: color var(--transition);
}
.faq-item summary:hover { color: var(--gold); }
.faq-item summary::after {
  content: '+'; font-size: 1.4rem; color: var(--gold); font-weight: 300; transition: transform var(--transition);
}
.faq-item[open] summary::after { content: '−'; transform: rotate(180deg); }

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

.faq-filter { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 40px; }
.faq-filter-btn {
  padding: 8px 20px; border-radius: 50px; font-size: 0.9rem; font-weight: 600;
  background: var(--bg-card); color: var(--text-secondary); border: 1px solid var(--border);
  cursor: pointer; transition: all var(--transition);
}
.faq-filter-btn.active, .faq-filter-btn:hover { background: var(--gold); color: #0b1426; border-color: var(--gold); }

/* ===== Contact Form ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 600; color: var(--text-primary); margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 14px 18px; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--white); font-size: 0.95rem;
  font-family: inherit; transition: border-color var(--transition); resize: vertical;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--gold); box-shadow: 0 0 0 3px var(--gold-glow);
}

.contact-info { display: flex; flex-direction: column; gap: 20px; }
.contact-info-item {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 20px; display: flex; gap: 14px; align-items: flex-start;
}
.contact-info-icon {
  width: 44px; height: 44px; border-radius: 50%; flex-shrink: 0;
  background: rgba(240, 165, 0, 0.12); display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
}
.contact-info-item h3 { font-size: 1rem; color: var(--white); margin-bottom: 4px; }
.contact-info-item p { color: var(--text-secondary); font-size: 0.9rem; }

.social-links { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 8px; }
.social-link {
  width: 44px; height: 44px; border-radius: 50%; background: var(--bg-card);
  border: 1px solid var(--border); display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; transition: all var(--transition);
}
.social-link:hover { border-color: var(--gold); background: var(--bg-card-hover); color: var(--gold); transform: translateY(-2px); }

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-secondary); border-top: 1px solid var(--border);
  padding: 48px 0 28px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 36px; }
.footer-brand { font-size: 1.3rem; font-weight: 800; color: var(--gold); margin-bottom: 12px; }
.footer-about p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }
.footer-col h4 { font-size: 1rem; font-weight: 700; color: var(--white); margin-bottom: 16px; }
.footer-col a { display: block; color: var(--text-secondary); font-size: 0.9rem; padding: 4px 0; }
.footer-col a:hover { color: var(--gold); }
.footer-bottom { text-align: center; padding-top: 24px; border-top: 1px solid var(--border);
  color: var(--text-muted); font-size: 0.85rem; }

/* ===== Animations ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.reveal { opacity: 0; transform: translateY(30px); transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid, .services-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .compliance-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .hero .container { grid-template-columns: 1fr; gap: 40px; }
  .hero-content h1 { font-size: 2rem; }
  .hero-content p { font-size: 1rem; }
  .hero-image { order: -1; }
  .hero-image img { max-height: 280px; }

  .hamburger { display: flex; }
  .nav-links {
    display: none; position: fixed; top: 72px; left: 0; right: 0; bottom: 0;
    background: rgba(11, 20, 38, 0.98); backdrop-filter: blur(16px);
    flex-direction: column; justify-content: center; align-items: center; gap: 28px;
    z-index: 999;
  }
  .nav-links.active { display: flex; }

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

  .section { padding: 56px 0; }
  .section-header h2 { font-size: 1.7rem; }
  .page-hero h1 { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .hero-buttons { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .stats-grid, .team-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}