/* ========================================
   欧交易所 | 全球数字化生态平台
   主样式表
   ======================================== */

/* --- CSS变量 --- */
:root {
  --color-bg: #080c18;
  --color-bg-card: #0f1427;
  --color-bg-card-hover: #161e3a;
  --color-primary: #1d4ed8;
  --color-primary-light: #3b82f6;
  --color-cyan: #06b6d4;
  --color-green: #10b981;
  --color-purple: #8b5cf6;
  --color-gold: #f59e0b;
  --color-white: #ffffff;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-border: rgba(255,255,255,0.06);
  --transition-base: 0.3s ease;
  --radius: 12px;
  --radius-lg: 20px;
  --max-width: 1280px;
}

/* --- 基础重置 --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

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

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

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

/* --- 导航栏 --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(8, 12, 24, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-nav ul {
  display: flex;
  gap: 8px;
}

.main-nav a {
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--transition-base);
  position: relative;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-white);
  background: rgba(29, 78, 216, 0.15);
}

.main-nav a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--color-cyan);
  border-radius: 2px;
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: all 0.3s;
}

/* --- Hero区域 --- */
.hero {
  padding-top: 140px;
  padding-bottom: 100px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(circle at 30% 20%, rgba(29,78,216,0.15) 0%, transparent 50%),
    radial-gradient(circle at 70% 60%, rgba(6,182,212,0.12) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(139,92,246,0.1) 0%, transparent 50%);
  animation: bgShift 20s ease-in-out infinite;
}

@keyframes bgShift {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(2%, -1%); }
  66% { transform: translate(-1%, 2%); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 20px;
  background: rgba(29,78,216,0.2);
  border: 1px solid rgba(29,78,216,0.4);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-primary-light);
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--color-cyan), var(--color-primary-light), var(--color-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 700px;
  margin: 0 auto 36px;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero-tags span {
  padding: 8px 18px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  font-size: 0.88rem;
  color: var(--color-text);
  transition: all var(--transition-base);
}

.hero-tags span:hover {
  border-color: var(--color-cyan);
  color: var(--color-cyan);
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

/* --- 按钮 --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-cyan));
  color: var(--color-white);
  box-shadow: 0 4px 24px rgba(29,78,216,0.35);
  animation: ctaPulse 2s ease-in-out infinite;
}

@keyframes ctaPulse {
  0%, 100% { box-shadow: 0 4px 24px rgba(29,78,216,0.35); }
  50% { box-shadow: 0 4px 40px rgba(29,78,216,0.6), 0 0 60px rgba(6,182,212,0.3); }
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 36px rgba(29,78,216,0.5), 0 0 80px rgba(6,182,212,0.4);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-cyan);
  color: var(--color-cyan);
}

.btn-outline:hover {
  background: rgba(6,182,212,0.1);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.1rem;
}

/* --- 区块标题 --- */
.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title .label {
  display: inline-block;
  padding: 4px 16px;
  background: rgba(16,185,129,0.15);
  border: 1px solid rgba(16,185,129,0.3);
  border-radius: 50px;
  font-size: 0.82rem;
  color: var(--color-green);
  margin-bottom: 12px;
}

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

.section-title h2 span {
  background: linear-gradient(135deg, var(--color-cyan), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  max-width: 650px;
  margin: 0 auto;
}

/* --- 区块通用 --- */
section {
  padding: 90px 0;
  position: relative;
}

section:nth-child(even) {
  background: rgba(15, 20, 39, 0.4);
}

/* --- 6大优势卡片 --- */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.adv-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.adv-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-cyan), var(--color-purple));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.adv-card:hover {
  border-color: rgba(29,78,216,0.4);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0,0,0,0.4);
  background: var(--color-bg-card-hover);
}

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

.adv-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.adv-icon.blue { background: rgba(29,78,216,0.15); color: var(--color-primary-light); }
.adv-icon.cyan { background: rgba(6,182,212,0.15); color: var(--color-cyan); }
.adv-icon.green { background: rgba(16,185,129,0.15); color: var(--color-green); }
.adv-icon.purple { background: rgba(139,92,246,0.15); color: var(--color-purple); }
.adv-icon.gold { background: rgba(245,158,11,0.15); color: var(--color-gold); }

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

.adv-card p {
  color: var(--color-text-muted);
  font-size: 0.925rem;
}

/* --- 数据面板 --- */
.stats-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 32px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.stat-value {
  font-size: 2.4rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.stat-item .stat-suffix {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-cyan);
}

.stat-label {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* --- 生态应用场景 --- */
.eco-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.eco-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--transition-base);
}

.eco-card:hover {
  border-color: rgba(139,92,246,0.4);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.eco-icon {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin: 0 auto 16px;
  background: rgba(139,92,246,0.15);
  color: var(--color-purple);
}

.eco-card h4 {
  font-weight: 700;
  margin-bottom: 6px;
}

.eco-card p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* --- CTA区域 --- */
.cta-section {
  text-align: center;
  padding: 90px 0;
}

.cta-section h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-section p {
  color: var(--color-text-muted);
  margin-bottom: 32px;
  font-size: 1.1rem;
}

/* --- 页脚 --- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 48px 0 28px;
  background: rgba(8, 12, 24, 0.8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}

.footer-brand .logo { margin-bottom: 12px; }
.footer-brand p { color: var(--color-text-muted); font-size: 0.9rem; }

.footer-col h4 {
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-white);
}

.footer-col a {
  display: block;
  padding: 4px 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: color var(--transition-base);
}

.footer-col a:hover { color: var(--color-cyan); }

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

/* --- 服务页面卡片 --- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-base);
}

.service-card:hover {
  border-color: rgba(29,78,216,0.4);
  background: var(--color-bg-card-hover);
  transform: translateY(-3px);
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 16px 0 10px;
}

.service-card p {
  color: var(--color-text-muted);
  font-size: 0.925rem;
  margin-bottom: 20px;
}

.service-card img {
  border-radius: var(--radius);
}

/* --- FAQ --- */
.faq-section {
  padding: 120px 0 90px;
}

.faq-list {
  max-width: 850px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition-base);
}

.faq-item:hover {
  border-color: rgba(29,78,216,0.3);
}

.faq-item summary {
  padding: 20px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  font-size: 1.02rem;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--color-cyan);
  transition: transform 0.3s;
}

.faq-item[open] summary::after {
  content: '−';
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--color-text-muted);
  font-size: 0.925rem;
  line-height: 1.8;
}

/* --- 联系表单 --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  max-width: 1100px;
  margin: 0 auto;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 16px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  color: var(--color-white);
  font-size: 0.95rem;
  transition: border-color var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-cyan);
}

.form-group textarea { resize: vertical; min-height: 130px; }

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-info-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.contact-info-item .ci-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(29,78,216,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  color: var(--color-primary-light);
}

.contact-info-item h4 { font-weight: 700; margin-bottom: 4px; }
.contact-info-item p { color: var(--color-text-muted); font-size: 0.9rem; }

/* --- 关于页面 --- */
.about-hero { padding-top: 160px; }
.about-intro { max-width: 850px; margin: 0 auto 60px; text-align: center; }
.about-intro p { color: var(--color-text-muted); font-size: 1.08rem; line-height: 1.9; }

.timeline {
  max-width: 750px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-cyan), var(--color-purple));
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: 40px;
  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: 8px;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-cyan);
  border: 3px solid var(--color-bg);
  z-index: 2;
}

.timeline-content {
  width: 44%;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
}

.timeline-content .year {
  font-weight: 800;
  color: var(--color-cyan);
  margin-bottom: 4px;
}

.timeline-content p { color: var(--color-text-muted); font-size: 0.9rem; }

/* --- 团队网格 --- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}

.team-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  transition: all var(--transition-base);
}

.team-card:hover {
  border-color: rgba(139,92,246,0.3);
  transform: translateY(-3px);
}

.team-card img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 16px;
  object-fit: cover;
}

.team-card h4 { font-weight: 700; margin-bottom: 4px; }
.team-card .role { color: var(--color-cyan); font-size: 0.85rem; margin-bottom: 8px; }

/* --- 合规区块 --- */
.compliance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}

.compliance-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  text-align: center;
  transition: all var(--transition-base);
}

.compliance-card:hover {
  border-color: rgba(16,185,129,0.4);
}

.compliance-card .cc-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(16,185,129,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  font-size: 1.3rem;
  color: var(--color-green);
}

.compliance-card h4 { font-weight: 700; margin-bottom: 6px; }
.compliance-card p { color: var(--color-text-muted); font-size: 0.88rem; }

/* --- 行情表 --- */
.market-table-wrap { overflow-x: auto; }
.market-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.925rem;
}
.market-table th {
  text-align: left;
  padding: 14px 16px;
  background: var(--color-bg-card);
  color: var(--color-text-muted);
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
}
.market-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
}
.market-table tr:hover td {
  background: rgba(29,78,216,0.06);
}
.up { color: var(--color-green); font-weight: 600; }
.down { color: #ef4444; font-weight: 600; }

/* --- 面包屑 --- */
.breadcrumb {
  padding: 90px 0 0;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}
.breadcrumb a { color: var(--color-cyan); }
.breadcrumb .sep { margin: 0 8px; }

/* --- 动画 --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.7s ease-out;
}

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

/* 数据流动动画 */
@keyframes dataFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.data-flow-bg {
  background: linear-gradient(90deg, var(--color-bg) 0%, rgba(29,78,216,0.08) 50%, var(--color-bg) 100%);
  background-size: 200% 100%;
  animation: dataFlow 6s ease-in-out infinite;
}

/* 生态节点连接 */
.eco-node-line {
  position: absolute;
  width: 2px;
  background: linear-gradient(180deg, rgba(6,182,212,0), rgba(6,182,212,0.5), rgba(6,182,212,0));
  animation: nodeGlow 3s ease-in-out infinite;
}

@keyframes nodeGlow {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* --- 响应式 --- */
@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .main-nav ul {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(8,12,24,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
  }
  .main-nav ul.open { display: flex; }
  .main-nav a { padding: 12px 0; }

  .timeline::before { left: 20px; }
  .timeline-dot { left: 20px; }
  .timeline-item { flex-direction: row !important; }
  .timeline-content { width: calc(100% - 50px); margin-left: 50px; }

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

  .advantages-grid,
  .service-grid {
    grid-template-columns: 1fr;
  }

  .hero { padding-top: 120px; padding-bottom: 60px; }
  .stats-panel { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .hero-cta { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
  .stats-panel { grid-template-columns: 1fr; }
}