/* ============================================
   X-金盾官网 - 金融级炫酷 · 全平台自适应
   深色专业风 + 蓝金点缀 + 高级动效
   ============================================ */

:root {
  --bg-dark: #0a0e14;
  --bg-card: #0f1419;
  --bg-card-hover: #161d26;
  --border: #2d3748;
  --border-light: #1e2633;

  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.4);
  --accent-muted: rgba(59, 130, 246, 0.12);

  --gold: #f59e0b;
  --gold-light: #fbbf24;
  --gold-glow: rgba(245, 158, 11, 0.35);
  --gold-muted: rgba(245, 158, 11, 0.1);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --container-max: 1280px;
  --radius: 16px;
  --radius-sm: 10px;
  --header-h: 64px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.2s ease;
}

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

/* 无障碍：跳过导航链接（大厂标准） */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 9999;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top 0.2s;
}

.skip-link:focus {
  top: 1rem;
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* 焦点可见性（无障碍） */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 移动端安全区域 */
@supports (padding: max(0px)) {
  body {
    padding-left: env(safe-area-inset-left, 0);
    padding-right: env(safe-area-inset-right, 0);
  }
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem);
}

/* ========== 动效：网格背景 ========== */
.grid-bg {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* ========== 动效：浮动光晕 ========== */
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.5;
  animation: floatGlow 8s ease-in-out infinite;
  pointer-events: none;
}

.hero-glow-1 {
  width: 400px;
  height: 400px;
  background: var(--accent-glow);
  top: -100px;
  left: 20%;
  animation-delay: 0s;
}

.hero-glow-2 {
  width: 300px;
  height: 300px;
  background: var(--gold-glow);
  bottom: 20%;
  right: 10%;
  animation-delay: -4s;
}

@keyframes floatGlow {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -20px) scale(1.1); }
}

/* ========== 动效：数据流线条 ========== */
.data-stream {
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, transparent, var(--accent), transparent);
  opacity: 0.15;
  animation: dataStream 3s linear infinite;
  pointer-events: none;
}

.data-stream:nth-child(2) { left: 25%; animation-delay: 0.5s; }
.data-stream:nth-child(3) { left: 50%; animation-delay: 1s; }
.data-stream:nth-child(4) { left: 75%; animation-delay: 1.5s; }

@keyframes dataStream {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(100vh); }
}

/* ========== 导航 ========== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(45, 55, 72, 0.5);
  transition: all var(--transition);
}

.header.scrolled {
  background: rgba(10, 14, 20, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  min-height: 44px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-primary);
  font-weight: 700;
  font-size: clamp(1rem, 4vw, 1.25rem);
  transition: transform var(--transition);
}

.logo:hover {
  color: var(--gold);
  transform: scale(1.02);
}

.logo-icon {
  font-size: 1.5rem;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.8; }
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: clamp(1rem, 3vw, 2rem);
}

.nav-menu a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: clamp(0.9rem, 2.5vw, 1rem);
  padding: 0.5rem 0;
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  transition: width var(--transition);
}

.nav-menu a:hover {
  color: var(--text-primary);
}

.nav-menu a:hover::after {
  width: 100%;
}

/* 导航分组与下拉 */
.nav-group {
  position: relative;
}

.nav-group > a::after {
  content: '';
  display: inline-block;
  margin-left: 0.25em;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  vertical-align: 0.2em;
}

.nav-drop {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(0.5rem);
  min-width: 160px;
  padding: 0.5rem 0;
  background: rgba(15, 20, 25, 0.98);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.nav-group:hover .nav-drop {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-drop li {
  width: 100%;
}

.nav-drop a {
  display: block;
  padding: 0.6rem 1.25rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.nav-drop a:hover {
  color: var(--accent);
  background: var(--accent-muted);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.nav-toggle:hover {
  background: var(--bg-card);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ========== 主视觉 Hero ========== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: var(--header-h) 0 3rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 100% 80% at 50% -20%, var(--accent-muted) 0%, transparent 55%),
    radial-gradient(ellipse 70% 50% at 90% 80%, var(--gold-muted) 0%, transparent 50%),
    var(--bg-dark);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem 0;
}

/* 标题渐变闪烁 */
.hero-title {
  font-size: clamp(2.25rem, 10vw, 4.5rem);
  font-weight: 800;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #fff 0%, var(--accent) 35%, var(--gold) 70%, #fff 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 4s linear infinite;
  opacity: 0;
  animation: shimmer 4s linear infinite, fadeInUp 0.8s 0.2s forwards;
}

@keyframes shimmer {
  0% { background-position: 0% center; }
  100% { background-position: 200% center; }
}

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

.hero-subtitle {
  font-size: clamp(0.95rem, 2.8vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeInUp 0.8s 0.4s forwards;
}

.hero-desc {
  max-width: 540px;
  margin: 0 auto 2rem;
  color: var(--text-muted);
  font-size: clamp(0.875rem, 2.2vw, 1rem);
  line-height: 1.7;
  opacity: 0;
  animation: fadeInUp 0.8s 0.6s forwards;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  opacity: 0;
  animation: fadeInUp 0.8s 0.8s forwards;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.875rem;
  min-height: 48px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: clamp(0.9rem, 2.5vw, 1rem);
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #2563eb);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 20px var(--accent-muted);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.03);
  color: var(--accent);
  border-color: var(--border);
}

.btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-muted);
  color: var(--accent-hover);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1rem 2.25rem;
  font-size: 1rem;
}

/* ========== 通用区块 ========== */
.section {
  position: relative;
  z-index: 1;
  padding: clamp(4rem, 12vw, 7rem) 0;
}

.section-title {
  font-size: clamp(1.5rem, 5vw, 2.25rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.75rem;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease;
}

.section-title .section-en {
  display: block;
  font-size: 0.5em;
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 0.25em;
  letter-spacing: 0.1em;
}

.section-title.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-desc {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  font-size: clamp(0.9rem, 2.2vw, 1rem);
}

/* ========== 市场对比 ========== */
.contrast-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.contrast-card {
  border-radius: var(--radius);
  padding: 1.75rem;
  border: 1px solid var(--border);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s ease;
}

.contrast-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.contrast-card.bad {
  background: rgba(239, 68, 68, 0.05);
  border-color: rgba(239, 68, 68, 0.3);
}

.contrast-card.bad h3 {
  color: #f87171;
}

.contrast-card.good {
  background: rgba(34, 197, 94, 0.05);
  border-color: rgba(34, 197, 94, 0.3);
}

.contrast-card.good h3 {
  color: #4ade80;
}

.contrast-card h3 {
  font-size: 1.15rem;
  margin-bottom: 1rem;
}

.contrast-card ul {
  list-style: none;
}

.contrast-card li {
  padding: 0.4rem 0;
  padding-left: 1.25rem;
  position: relative;
  font-size: 0.9rem;
  line-height: 1.5;
}

.contrast-card.bad li::before {
  content: '×';
  position: absolute;
  left: 0;
  color: #f87171;
  font-weight: 700;
}

.contrast-card.good li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #4ade80;
  font-weight: 700;
}

.contrast-card.bad li {
  color: var(--text-secondary);
}

.contrast-card.good li {
  color: var(--text-secondary);
}

/* ========== 投资风险提示 ========== */
.risk-content {
  max-width: 720px;
  margin: 2rem auto 0;
}

.risk-alert {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: var(--radius);
  padding: 1.75rem;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s ease;
}

.risk-alert.visible {
  opacity: 1;
  transform: translateY(0);
}

.risk-alert p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.risk-alert p:last-child {
  margin-bottom: 0;
}

.risk-alert strong {
  color: var(--gold);
}

/* ========== 产品特点卡片 ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.feature-card {
  background: linear-gradient(145deg, var(--bg-card) 0%, rgba(15, 20, 25, 0.8) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 4vw, 1.75rem);
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(30px);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 30px var(--accent-muted);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  margin-bottom: 1rem;
  display: inline-block;
  transition: transform var(--transition);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1);
}

.feature-card h3 {
  font-size: clamp(1rem, 2.8vw, 1.15rem);
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: clamp(0.85rem, 2.2vw, 0.95rem);
  line-height: 1.6;
}

/* ========== 购买与下载 ========== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.action-card {
  background: linear-gradient(145deg, var(--bg-card) 0%, rgba(15, 20, 25, 0.9) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 5vw, 2rem);
  text-align: center;
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(30px);
}

.action-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.action-card:hover {
  border-color: var(--gold);
  transform: translateY(-5px) scale(1.02);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4), 0 0 40px var(--gold-muted);
}

.action-card-icon {
  font-size: clamp(2rem, 6vw, 2.5rem);
  margin-bottom: 1rem;
  display: inline-block;
  animation: bounce 2s ease-in-out infinite;
}

.action-card:nth-child(2) .action-card-icon {
  animation-delay: 0.3s;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.action-card h3 {
  font-size: clamp(1.1rem, 3vw, 1.25rem);
  margin-bottom: 0.5rem;
}

.action-card p {
  color: var(--text-secondary);
  font-size: clamp(0.85rem, 2.2vw, 0.95rem);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

/* ========== 定价方案 ========== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.pricing-card {
  background: linear-gradient(145deg, var(--bg-card) 0%, rgba(15, 20, 25, 0.9) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  position: relative;
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(30px);
}

.pricing-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.pricing-card.featured {
  border-color: var(--gold);
  box-shadow: 0 0 30px var(--gold-muted);
}

.pricing-card .badge {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: #0a0e14;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
}

.pricing-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.pricing-card .price {
  margin-bottom: 0.5rem;
}

.pricing-card .amount {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.pricing-card .unit {
  font-size: 1.25rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.pricing-card .period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.pricing-card .price-rmb {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0 0 0.5rem 0;
}

.pricing-card .price-note {
  font-size: 0.85rem;
  color: var(--gold);
  margin-bottom: 1rem;
}

.pricing-card .price-features {
  list-style: none;
  text-align: left;
  margin-bottom: 1.5rem;
}

.pricing-card .price-features li {
  padding: 0.4rem 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-light);
}

.pricing-card .price-features li:last-child {
  border-bottom: none;
}

/* ========== 代理合作 ========== */
.agency-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.agency-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s ease;
}

.agency-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.agency-card h3 {
  font-size: 1.15rem;
  margin-bottom: 1rem;
  color: var(--gold);
}

.agency-card ul {
  list-style: none;
}

.agency-card li {
  padding: 0.5rem 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding-left: 1.25rem;
  position: relative;
}

.agency-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.agency-cta {
  text-align: center;
  margin-top: 2rem;
}

/* ========== 最新动态 ========== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.news-card {
  display: block;
  background: linear-gradient(145deg, var(--bg-card) 0%, rgba(15, 20, 25, 0.9) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  transition: all var(--transition);
  opacity: 0;
  transform: translateY(20px);
}

.news-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.news-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

.news-card .news-date {
  font-size: 0.8rem;
  color: var(--gold);
  margin-bottom: 0.5rem;
  display: block;
}

.news-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.news-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========== 关于我们 ========== */
.about-content {
  max-width: 680px;
  margin: 2rem auto 0;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease;
}

.about-content.visible {
  opacity: 1;
  transform: translateY(0);
}

.about-content p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

/* ========== 常见问题 ========== */
.faq-list {
  max-width: 700px;
  margin: 2rem auto 0;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  overflow: hidden;
  opacity: 0;
  transform: translateY(15px);
  transition: all 0.4s ease;
}

.faq-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.faq-item summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--accent);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 1.25rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid var(--border-light);
  margin-top: 0;
  padding-top: 1rem;
}

/* ========== 联系我们 ========== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  text-align: center;
  transition: all var(--transition);
  color: inherit;
  opacity: 0;
  transform: translateY(20px);
}

.contact-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.contact-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.contact-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.75rem;
}

.contact-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

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

/* ========== 卡密管理 ========== */
.manage {
  background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-dark) 100%);
  border-top: 1px solid var(--border);
}

.manage-box {
  text-align: center;
  margin-top: 1.5rem;
}

.manage-box .btn {
  animation: glow 2s ease-in-out infinite;
}

@keyframes glow {
  0%, 100% { box-shadow: 0 4px 20px var(--accent-muted); }
  50% { box-shadow: 0 4px 30px var(--accent-glow); }
}

/* ========== 页脚 ========== */
.footer {
  padding: clamp(2rem, 6vw, 3rem) 0 clamp(1.5rem, 4vw, 2rem);
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

.footer-main {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2.5rem;
  margin-bottom: 2rem;
}

@media (max-width: 900px) {
  .footer-main {
    grid-template-columns: repeat(2, 1fr);
  }
}

.footer-col h4 {
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.footer-col a {
  display: block;
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 0.35rem 0;
}

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

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-light);
  text-align: center;
}

.footer-copy {
  color: var(--text-muted);
  font-size: clamp(0.75rem, 2vw, 0.85rem);
}

.footer-icp {
  margin-top: 0.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ============================================
   移动端自适应 - 全面优化
   ============================================ */

/* 平板及以下 */
@media (max-width: 768px) {
  :root {
    --header-h: 56px;
  }

  .container {
    padding: 0 1rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(15, 20, 25, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    gap: 0.25rem;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-group .nav-drop {
    position: static;
    transform: none;
    min-width: auto;
    padding: 0 0 0 1rem;
    margin-top: 0.25rem;
    margin-bottom: 0.5rem;
    background: rgba(0, 0, 0, 0.2);
    border: none;
    border-radius: var(--radius-sm);
    box-shadow: none;
    opacity: 1;
    visibility: visible;
  }

  .nav-group > a::after {
    display: none;
  }

  .nav-drop a {
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
  }

  .nav-menu a {
    display: block;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    padding-top: var(--header-h);
    padding-bottom: 2rem;
    min-height: 100vh;
    min-height: 100dvh;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .hero-desc {
    font-size: 0.9rem;
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .hero-buttons .btn {
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
  }

  .section {
    padding: 2.5rem 0;
  }

  .features-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .pricing-card.featured {
    order: -1;
  }

  .agency-content {
    grid-template-columns: 1fr;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    text-align: center;
  }

  .footer-col h4 {
    margin-top: 0.5rem;
  }

  .data-stream {
    display: none;
  }

  .hero-glow {
    filter: blur(80px);
    opacity: 0.3;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .container {
    padding: 0 0.875rem;
  }

  .hero-title {
    font-size: 1.875rem;
  }

  .hero-subtitle {
    font-size: 0.875rem;
  }

  .feature-card,
  .action-card {
    padding: 1.25rem;
  }

  .btn {
    min-height: 48px;
    padding: 1rem 1.5rem;
  }
}

/* 超小屏 */
@media (max-width: 360px) {
  .container {
    padding: 0 0.75rem;
  }

  .hero-title {
    font-size: 1.6rem;
  }
}