/* ===================================================================
   瞬云 (ShunYun) - Glacial Crystalline High-Velocity Light UI
   Cold-Luxury Palette:
     - Frozen Polar Mist White: #f5f8fc
     - Pristine Ice Crystal White: #ffffff
     - Glacial Piercing Cyan-Blue: #0ea5e9 (#0284c7, #38bdf8)
     - Frost-Pine Green: #059669 (#10b981)
   Features:
     - Pill navigation bar with crystalline refraction
     - Strictly 3-card layout for core advantages
     - High-clarity refraction borders & 24px rounded cards
     - Cryogenic freeze micro-interactions & frost-condensation hover
     - Completely free of AI robot icons
   =================================================================== */

:root {
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  /* 默认：极地冰雾白天模式 (Glacial Light Mode) */
  --bg-primary: #f5f8fc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #edf3fa;
  --bg-card: rgba(255, 255, 255, 0.82);
  --bg-card-hover: rgba(255, 255, 255, 0.96);
  --bg-pill: rgba(255, 255, 255, 0.85);

  --border-refract: rgba(14, 165, 233, 0.22);
  --border-subtle: rgba(203, 213, 225, 0.65);
  --border-frost: rgba(14, 165, 233, 0.55);

  --text-main: #0c1829;
  --text-muted: #526581;
  --text-light: #8ba0ba;

  --glacial-cyan: #0ea5e9;
  --glacial-cyan-hover: #0284c7;
  --glacial-cyan-glow: rgba(14, 165, 233, 0.25);
  --glacial-cyan-light: rgba(14, 165, 233, 0.08);

  --frost-pine: #059669;
  --frost-pine-glow: rgba(5, 150, 105, 0.2);

  --brand-color: #6a72dc;
  --brand-color-glow: rgba(106, 114, 220, 0.35);
  --brand-gradient: linear-gradient(135deg, #6a72dc 0%, #807be7 100%);

  --ice-gradient: linear-gradient(135deg, #0ea5e9 0%, #0284c7 60%, #0369a1 100%);
  --frost-gradient: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(240, 248, 255, 0.6) 100%);
  --header-frost: rgba(245, 248, 252, 0.82);

  --shadow-crystal: 0 10px 30px -10px rgba(14, 165, 233, 0.12), 0 2px 8px rgba(12, 24, 41, 0.04);
  --shadow-hover: 0 20px 40px -12px rgba(14, 165, 233, 0.24), 0 0 0 1px rgba(14, 165, 233, 0.45);
  --shadow-pill: 0 8px 32px 0 rgba(14, 165, 233, 0.14), inset 0 1px 0 rgba(255, 255, 255, 0.9);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-card: 24px;
  --radius-pill: 9999px;

  --transition-snap: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 极地冰晶夜间模式 (Cryogenic Dark Mode) */
[data-theme="dark"] {
  --bg-primary: #070d18;
  --bg-secondary: #0c1626;
  --bg-tertiary: #111f35;
  --bg-card: rgba(12, 22, 38, 0.78);
  --bg-card-hover: rgba(16, 30, 52, 0.94);
  --bg-pill: rgba(12, 22, 38, 0.85);

  --border-refract: rgba(56, 189, 248, 0.25);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-frost: rgba(56, 189, 248, 0.65);

  --text-main: #f0f6fc;
  --text-muted: #9bb0c9;
  --text-light: #5f748f;

  --glacial-cyan: #38bdf8;
  --glacial-cyan-hover: #7dd3fc;
  --glacial-cyan-glow: rgba(56, 189, 248, 0.32);
  --glacial-cyan-light: rgba(56, 189, 248, 0.12);

  --frost-pine: #10b981;
  --frost-pine-glow: rgba(16, 185, 129, 0.28);

  --brand-color: #828bf8;
  --brand-color-glow: rgba(130, 139, 248, 0.45);
  --brand-gradient: linear-gradient(135deg, #828bf8 0%, #a5b4fc 100%);

  --ice-gradient: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 60%, #0284c7 100%);
  --frost-gradient: linear-gradient(135deg, rgba(16, 30, 52, 0.9) 0%, rgba(12, 22, 38, 0.6) 100%);
  --header-frost: rgba(7, 13, 24, 0.85);

  --shadow-crystal: 0 12px 35px -10px rgba(0, 0, 0, 0.55), 0 0 20px rgba(56, 189, 248, 0.1);
  --shadow-hover: 0 24px 45px -10px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(56, 189, 248, 0.65), 0 0 25px rgba(56, 189, 248, 0.25);
  --shadow-pill: 0 8px 32px 0 rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
  background-image: 
    radial-gradient(at 10% 10%, rgba(14, 165, 233, 0.12) 0px, transparent 50%),
    radial-gradient(at 90% 40%, rgba(5, 150, 105, 0.08) 0px, transparent 45%),
    radial-gradient(at 50% 90%, rgba(14, 165, 233, 0.08) 0px, transparent 55%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-snap), opacity var(--transition-snap);
}

img, svg {
  display: block;
  max-width: 100%;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --- 布局与容器 --- */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-tertiary);
  transition: background-color var(--transition-smooth);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--glacial-cyan);
  background: var(--glacial-cyan-light);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  backdrop-filter: blur(10px);
  white-space: nowrap;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  color: var(--text-main);
}

.section-subtitle {
  font-size: 1.12rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* --- 冰晶冷萃按钮系统 --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: 0.98rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-snap);
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--ice-gradient);
  color: #ffffff;
  box-shadow: 0 4px 18px 0 rgba(14, 165, 233, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px 0 rgba(14, 165, 233, 0.5);
  color: #ffffff;
  filter: brightness(1.06);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-refract);
  backdrop-filter: blur(12px);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--glacial-cyan);
  color: var(--glacial-cyan);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(14, 165, 233, 0.15);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
  border-radius: var(--radius-md);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
}

.btn-block {
  width: 100%;
}

/* --- 胶囊状晶体浮动导航栏 (Pill Navigation Bar) --- */
.navbar-wrapper {
  position: sticky;
  top: 18px;
  z-index: 1000;
  padding: 0 20px;
}

.navbar-pill {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--bg-pill);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-pill);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  padding: 0 24px;
  transition: all var(--transition-smooth);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-logo-img {
  height: 44px;
  width: auto;
  object-fit: contain;
  display: block;
  filter: drop-shadow(0 3px 8px rgba(14, 165, 233, 0.25));
  transition: transform var(--transition-snap);
}

.brand-text-img {
  height: 30px;
  width: auto;
  object-fit: contain;
  display: block;
  filter: drop-shadow(0 2px 6px rgba(106, 114, 220, 0.25));
  transition: transform var(--transition-snap);
}

[data-theme="dark"] .brand-text-img {
  filter: drop-shadow(0 0 10px rgba(130, 139, 248, 0.55)) brightness(1.15);
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.08) rotate(-2deg);
}

.brand-logo:hover .brand-text-img {
  transform: scale(1.04);
}

.brand-font-custom {
  font-family: "YouSheBiaoTiHei", "Alibaba PuHuiTi", "MiSans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-weight: 900;
  color: var(--brand-color);
  letter-spacing: 0.03em;
}

.gradient-brand-font {
  font-family: "YouSheBiaoTiHei", "Alibaba PuHuiTi", "MiSans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-weight: 900;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  filter: drop-shadow(0 2px 8px var(--brand-color-glow));
  letter-spacing: 0.02em;
}

.brand-text-cloud {
  background: var(--ice-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 0.95em;
  margin-left: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  transition: all var(--transition-snap);
}

.nav-link:hover, .nav-link.active {
  color: var(--glacial-cyan);
  background: var(--glacial-cyan-light);
}

/* 推荐资讯特殊徽标样式 */
.nav-link-special {
  color: var(--frost-pine) !important;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 5px;
}

.nav-link-special::after {
  content: "NEW";
  font-size: 0.65rem;
  font-weight: 800;
  background: var(--frost-pine);
  color: #ffffff;
  padding: 1px 6px;
  border-radius: var(--radius-pill);
  line-height: 1.3;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 昼夜切换按钮（精致冰透感透明按钮） */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  background: var(--glacial-cyan-light);
  border: 1px solid var(--border-refract);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  transition: all var(--transition-snap);
}

.theme-toggle-btn:hover {
  background: rgba(14, 165, 233, 0.2);
  border-color: var(--glacial-cyan);
  transform: rotate(20deg) scale(1.08);
}

.theme-toggle-btn svg {
  width: 19px;
  height: 19px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; stroke: #38bdf8; }
[data-theme="dark"] .icon-moon { display: none; }

/* --- 6. 首页主视觉区 (Hero Section) --- */
.hero-section {
  padding: 70px 0 85px 0;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  border: 1px solid var(--border-refract);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-crystal);
  margin-bottom: 24px;
  color: var(--text-main);
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--frost-pine);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.7);
  animation: pulse-frost 2s infinite;
}

@keyframes pulse-frost {
  0% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.7); }
  70% { box-shadow: 0 0 0 8px rgba(5, 150, 105, 0); }
  100% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.03em;
  max-width: 960px;
  margin: 0 auto 22px auto;
  color: var(--text-main);
}

.gradient-ice {
  background: var(--ice-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px auto;
  line-height: 1.68;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 46px;
  flex-wrap: wrap;
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  color: var(--text-muted);
  font-size: 0.92rem;
  flex-wrap: wrap;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-meta-item svg {
  width: 18px;
  height: 18px;
  color: var(--frost-pine);
}

/* 核心指标统计条 (Crystalline Dashboard Bar) */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 56px;
  padding: 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-card);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-crystal);
}

.stat-item {
  text-align: center;
  border-right: 1px solid var(--border-subtle);
}
.stat-item:last-child {
  border-right: none;
}

.stat-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--glacial-cyan);
  line-height: 1.1;
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* --- 7. 产品核心优势：严格3卡片布局 (Strict 3-Card Layout) --- */
.features-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-crystal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-card);
  padding: 38px 32px;
  backdrop-filter: blur(16px);
  transition: all var(--transition-snap);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-crystal);
}

/* 冰晶冷凝高光边框 */
.feature-crystal-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--ice-gradient);
  opacity: 0;
  transition: opacity var(--transition-snap);
}

.feature-crystal-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-frost);
  background: var(--bg-card-hover);
}

.feature-crystal-card:hover::after {
  opacity: 1;
}

.feature-icon-crystal {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: var(--glacial-cyan-light);
  border: 1px solid var(--border-refract);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--glacial-cyan);
  margin-bottom: 24px;
}

.feature-icon-crystal svg {
  width: 28px;
  height: 28px;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-main);
}

.feature-desc {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-tag-item {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 12px;
  background: var(--glacial-cyan-light);
  color: var(--glacial-cyan);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-pill);
}

/* --- 8. 流媒体与 AI 生产力图卡展示区 (Free of AI Robot Icons) --- */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-crystal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-card);
  padding: 42px;
  backdrop-filter: blur(16px);
  transition: all var(--transition-snap);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-crystal);
}

.showcase-crystal-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-frost);
}

.showcase-badge {
  align-self: flex-start;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  margin-bottom: 20px;
  white-space: nowrap;
}

.badge-streaming {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.badge-ai {
  background: var(--glacial-cyan-light);
  color: var(--glacial-cyan);
  border: 1px solid var(--border-refract);
}

.showcase-title {
  font-size: 1.65rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-main);
}

.showcase-desc {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 28px;
}

.brand-chips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.chip-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-snap);
}

.chip-item:hover {
  transform: translateY(-2px);
  border-color: var(--glacial-cyan);
  background: var(--bg-card);
}

.chip-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chip-icon svg {
  width: 100%;
  height: 100%;
}

.showcase-highlights {
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-top: 1px dashed var(--border-subtle);
  padding-top: 22px;
  margin-top: auto;
}

.highlight-point {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-main);
}

.highlight-point svg {
  width: 18px;
  height: 18px;
  color: var(--frost-pine);
  flex-shrink: 0;
}

/* --- 9. 套餐价格对比表 (带月付/季付/年付周期切换器 & 24px冰晶边框) --- */
.billing-switcher-wrapper {
  display: flex;
  justify-content: center;
  margin-bottom: 44px;
}

.billing-switcher-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-crystal);
  backdrop-filter: blur(16px);
}

.billing-btn {
  padding: 8px 22px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-pill);
  transition: all var(--transition-snap);
}

.billing-btn.active {
  background: var(--ice-gradient);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.35);
}

.billing-discount-badge {
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--frost-pine);
  color: #ffffff;
  padding: 2px 7px;
  border-radius: var(--radius-pill);
  margin-left: 4px;
  white-space: nowrap;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card-crystal {
  background: var(--bg-card);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-card);
  padding: 36px 26px;
  backdrop-filter: blur(16px);
  transition: all var(--transition-snap);
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-crystal);
}

/* 悬停时的冰晶冷凝效果 (Cryogenic Frost-Condensation Effect) */
.pricing-card-crystal:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-frost);
  background: var(--bg-card-hover);
}

.pricing-card-crystal.featured {
  border: 2px solid var(--glacial-cyan);
  box-shadow: 0 0 30px rgba(14, 165, 233, 0.28), var(--shadow-crystal);
  background: var(--bg-card-hover);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ice-gradient);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.4);
  white-space: nowrap;
  z-index: 2;
}

.pricing-header {
  text-align: center;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 22px;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 40px;
}

.plan-price {
  margin: 18px 0 6px 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
  transition: opacity 0.15s ease;
}

.currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--glacial-cyan);
  margin-right: 4px;
}

.amount {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
  letter-spacing: -0.03em;
}

.period {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.feature-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-main);
}

.feature-row svg {
  width: 18px;
  height: 18px;
  color: var(--frost-pine);
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-row.disabled {
  color: var(--text-light);
}

.feature-row.disabled svg {
  color: var(--text-light);
}

/* --- 10. 用户评价 (Testimonials) --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.testimonial-crystal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  backdrop-filter: blur(16px);
  transition: all var(--transition-snap);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-crystal);
}

.testimonial-crystal-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-frost);
}

.testimonial-stars {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 16px;
}

.testimonial-stars svg {
  width: 17px;
  height: 17px;
  fill: currentColor;
}

.testimonial-quote {
  font-size: 0.98rem;
  color: var(--text-main);
  line-height: 1.68;
  margin-bottom: 22px;
  flex-grow: 1;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  background: var(--ice-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.user-info {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-main);
}

.user-role {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* --- 11. 常见问题解答 (FAQ) --- */
.faq-wrapper {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-crystal-item {
  background: var(--bg-card);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-snap);
  box-shadow: var(--shadow-crystal);
}

.faq-crystal-item:hover {
  border-color: var(--glacial-cyan);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-smooth);
  color: var(--text-muted);
  flex-shrink: 0;
}

details[open] .faq-icon {
  transform: rotate(180deg);
  color: var(--glacial-cyan);
}

details[open] .faq-question {
  border-bottom: 1px solid var(--border-subtle);
}

.faq-answer {
  padding: 20px 24px;
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.72;
}

/* --- 12. 页脚规范 (严格只保留四个标题，在新页面展示) --- */
.footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-refract);
  padding: 60px 0 40px 0;
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  transition: all var(--transition-snap);
}

.footer-link:hover {
  color: var(--glacial-cyan);
  background: var(--glacial-cyan-light);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-bottom p {
  margin-bottom: 8px;
}

/* --- 13. 单独子页面（关于我们、资讯、条款等）通用样式 --- */
.page-container {
  max-width: 920px;
  margin: 40px auto 100px auto;
  padding: 0 24px;
}

.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-card);
  padding: 48px;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-crystal);
}

.doc-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.doc-title {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.doc-meta {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.doc-section {
  margin-bottom: 36px;
}

.doc-section h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-section h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--glacial-cyan);
  border-radius: 2px;
}

.doc-section p {
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 14px;
  font-size: 1rem;
}

.doc-section ul {
  list-style: disc;
  margin-left: 24px;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.doc-section li {
  line-height: 1.75;
  margin-bottom: 8px;
}

.alert-box {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin: 20px 0;
  font-size: 0.95rem;
  line-height: 1.6;
}

.alert-info {
  background: var(--glacial-cyan-light);
  border: 1px solid var(--border-refract);
  color: var(--text-main);
}

.alert-warning {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  color: #ef4444;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: var(--glacial-cyan);
  margin-bottom: 24px;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--glacial-cyan-light);
  border: 1px solid var(--border-refract);
}
.back-link:hover {
  background: var(--border-refract);
}

/* --- 14. 资讯特有组件 --- */
.news-article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-card);
  padding: 32px;
  margin-bottom: 24px;
  transition: all var(--transition-snap);
}

.news-article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--border-frost);
}

.news-tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--frost-pine);
  background: rgba(5, 150, 105, 0.1);
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
}

.news-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.news-excerpt {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 16px;
}

/* --- 14.1 深度SEO科普长文章专业排版系统 --- */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.breadcrumb-nav a {
  color: var(--text-muted);
  transition: color var(--transition-snap);
}

.breadcrumb-nav a:hover {
  color: var(--glacial-cyan);
}

.breadcrumb-sep {
  color: var(--border-refract);
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.3;
  margin: 14px 0 16px 0;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 文章目录 (Table of Contents) 冰晶导航卡 */
.toc-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 32px 0 40px 0;
  backdrop-filter: blur(12px);
}

.toc-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--glacial-cyan);
  margin-bottom: 14px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-left: 6px;
}

.toc-item a {
  color: var(--text-main);
  font-size: 0.94rem;
  font-weight: 500;
  transition: all var(--transition-snap);
  display: inline-block;
  padding: 2px 0;
}

.toc-item a:hover {
  color: var(--glacial-cyan);
  transform: translateX(4px);
}

/* 文章正文排版 */
.article-content {
  color: var(--text-main);
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 48px 0 18px 0;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
  scroll-margin-top: 100px;
}

.article-content h2::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 22px;
  background: var(--ice-gradient);
  border-radius: 2px;
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 28px 0 14px 0;
  color: var(--text-main);
  scroll-margin-top: 100px;
}

.article-content p {
  margin-bottom: 18px;
  color: var(--text-muted);
}

.article-content strong {
  color: var(--text-main);
}

.article-content ul, .article-content ol {
  margin: 18px 0 24px 28px;
  color: var(--text-muted);
}

.article-content li {
  margin-bottom: 8px;
  line-height: 1.75;
}

.article-content blockquote {
  border-left: 4px solid var(--glacial-cyan);
  background: var(--glacial-cyan-light);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: var(--text-main);
  font-style: normal;
}

/* 比较表格 (Comparison Table) */
.article-table-wrapper {
  overflow-x: auto;
  margin: 26px 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
}

.data-table th, .data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
}

.data-table th {
  background: var(--bg-tertiary);
  color: var(--text-main);
  font-weight: 700;
}

.data-table tr:hover td {
  background: var(--glacial-cyan-light);
}

/* 文章内嵌专属 CTA 横幅 */
.article-cta-box {
  background: var(--frost-gradient);
  border: 1px solid var(--border-frost);
  border-radius: var(--radius-card);
  padding: 36px 32px;
  text-align: center;
  margin: 44px 0;
  box-shadow: var(--shadow-crystal);
}

.article-cta-box h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.article-cta-box p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 24px auto;
}

/* 文章底部相关阅读推荐 */
.related-reading-box {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

.related-reading-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 20px;
  color: var(--text-main);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.related-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-refract);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: all var(--transition-snap);
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  transform: translateY(-3px);
  border-color: var(--glacial-cyan);
  background: var(--bg-card);
}

.related-card-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.related-card-desc {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --- 15. 响应式适配 (@media 媒体查询) --- */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .features-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .showcase-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 60px 0;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .hero-title {
    font-size: 2.15rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  
  .navbar-wrapper {
    top: 10px;
    padding: 0 12px;
  }
  .navbar-pill {
    height: 60px;
    padding: 0 16px;
  }
  
  .nav-links {
    display: none;
  }
  .nav-cta-btn {
    display: none;
  }
  
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    padding: 20px;
  }
  .stat-item:nth-child(2) {
    border-right: none;
  }
  .stat-item:nth-child(3) {
    border-top: 1px solid var(--border-subtle);
    padding-top: 16px;
  }
  .stat-item:nth-child(4) {
    border-top: 1px solid var(--border-subtle);
    border-right: none;
    padding-top: 16px;
  }
  
  .features-grid-3 {
    grid-template-columns: 1fr;
  }
  
  .brand-chips-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
  
  .doc-card {
    padding: 28px 20px;
  }
  
  .doc-title {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }
  
  .hero-title {
    font-size: 1.85rem;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .btn {
    width: 100%;
  }
  
  .stats-bar {
    grid-template-columns: 1fr;
  }
  .stat-item {
    border-right: none !important;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 14px;
  }
  .stat-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  
  .brand-chips-grid {
    grid-template-columns: 1fr;
  }
  
  .brand-logo {
    font-size: 1.25rem;
    gap: 8px;
  }
  
  .brand-logo-img {
    height: 38px;
  }
  
  .brand-text-img {
    height: 24px;
  }
}