/* ===== 全局重置与变量 ===== */
:root {
  --primary: #00d4ff;
  --primary-dark: #0099cc;
  --secondary: #7b2ff7;
  --accent: #ff6b35;
  --bg-dark: #0a0e1a;
  --bg-card: #111827;
  --bg-card2: #1a2235;
  --text-light: #e2e8f0;
  --text-muted: #8892a4;
  --border: rgba(0, 212, 255, 0.15);
  --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #7b2ff7 100%);
  --gradient-dark: linear-gradient(180deg, #0a0e1a 0%, #111827 100%);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.15);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 3px;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 5%;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 14, 26, 0.98);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav-logo-icon {
  width: 38px;
  height: 38px;
  background: var(--gradient-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -1px;
}

.nav-logo-text {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}

.nav-logo-text span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: rgba(0, 212, 255, 0.08);
}

.nav-cta {
  background: var(--gradient-primary) !important;
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 8px !important;
}

.nav-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-light);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== 通用区块 ===== */
section {
  padding: 100px 5%;
}

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

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.25);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 50px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.section-tag::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.section-title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  color: #fff;
}

.section-title .highlight {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
  line-height: 1.8;
}

.text-center {
  text-align: center;
}

.text-center .section-desc {
  margin: 0 auto;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}

.btn-outline:hover {
  background: rgba(0, 212, 255, 0.08);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 16px;
  border-radius: 12px;
}

/* ===== 卡片 ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition);
}

.card:hover {
  border-color: rgba(0, 212, 255, 0.35);
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow), var(--shadow-card);
}

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

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.2);
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

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

/* ===== 网格布局 ===== */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* ===== 分隔线 ===== */
.divider {
  height: 1px;
  background: var(--border);
  margin: 0 5%;
}

/* ===== 背景装饰 ===== */
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.12;
  pointer-events: none;
}

.bg-glow-1 {
  width: 600px;
  height: 600px;
  background: var(--primary);
  top: -200px;
  right: -200px;
}

.bg-glow-2 {
  width: 400px;
  height: 400px;
  background: var(--secondary);
  bottom: -100px;
  left: -100px;
}

/* ===== 标签/徽章 ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
}

.badge-blue {
  background: rgba(0, 212, 255, 0.15);
  color: var(--primary);
  border: 1px solid rgba(0, 212, 255, 0.25);
}

.badge-purple {
  background: rgba(123, 47, 247, 0.15);
  color: #a78bfa;
  border: 1px solid rgba(123, 47, 247, 0.25);
}

/* ===== 列表项 ===== */
.check-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
}

.check-list li::before {
  content: '✓';
  color: var(--primary);
  font-weight: 700;
  font-size: 13px;
  width: 18px;
  height: 18px;
  background: rgba(0, 212, 255, 0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ===== 数字统计 ===== */
.stat-item {
  text-align: center;
}

.stat-number {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ===== 页脚 ===== */
footer {
  background: #080c18;
  border-top: 1px solid var(--border);
  padding: 60px 5% 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 16px;
  line-height: 1.8;
  max-width: 280px;
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
}

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

@keyframes fadeInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.animate-fade-up { animation: fadeInUp 0.7s ease forwards; }
.animate-float { animation: float 4s ease-in-out infinite; }

/* ===== 进度条 ===== */
.progress-bar {
  height: 4px;
  background: rgba(0, 212, 255, 0.1);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 8px;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: width 1.5s ease;
}

/* ===== 时间线 ===== */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--secondary));
}

.timeline-item {
  position: relative;
  margin-bottom: 36px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid var(--bg-dark);
  box-shadow: 0 0 10px var(--primary);
}

.timeline-year {
  font-size: 12px;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.timeline-title {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.timeline-text {
  font-size: 14px;
  color: var(--text-muted);
}

/* ===== 标签页 ===== */
.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.tab-btn {
  padding: 8px 20px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn.active,
.tab-btn:hover {
  background: rgba(0, 212, 255, 0.1);
  color: var(--primary);
  border-color: rgba(0, 212, 255, 0.35);
}

/* ===== 表单 ===== */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-light);
  font-size: 15px;
  transition: var(--transition);
  outline: none;
  font-family: inherit;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-control::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

/* ===== 加载动画 ===== */
.loader-ring {
  width: 80px;
  height: 80px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

/* ===== 页面加载动画 ===== */
.page-loader {
  position: fixed;
  inset: 0;
  background: var(--bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  flex-direction: column;
  gap: 16px;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.page-loader p {
  color: var(--text-muted);
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--gradient-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
  font-size: 18px;
  color: #fff;
  text-decoration: none;
}

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

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 212, 255, 0.4);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  section { padding: 70px 5%; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(20px);
    padding: 20px;
    border-bottom: 1px solid var(--border);
    gap: 4px;
  }
}