/* ==========================================================================
   TAG 极速网络加速器 - 极地冰川高定奢侈 UI 设计系统
   Deep-Arctic Glacial Crevasse Luxury UI Design for "TAG"
   品牌：TAG | 官网：https://tag-jichang.baby
   ========================================================================== */

/* --- 1. 极地色盘与高定变量系统 (Arctic Polar Palette) --- */
:root {
  /* 极地冰川核心调色板 (Polar Palette) */
  --arctic-black-ice: #05070a;         /* 深海黑冰底色 Abyssal Black Ice */
  --arctic-trench-indigo: #0a1b2e;     /* 极地深渊蓝 Glacial Trench Indigo */
  --arctic-trench-deep: #0f2b48;       /* 冰沟深靛 */
  --arctic-frosted-white: #f0f7fc;     /* 雾面冰山白 Translucent Frosted-Berg White */
  --cryogenic-cyan: #00f5d4;           /* 极冻荧光青 Piercing Cryogenic Cyan */
  --cryogenic-cyan-dim: rgba(0, 245, 212, 0.15);
  --cryogenic-cyan-glow: rgba(0, 245, 212, 0.45);
  --cryogenic-azure: #38bdf8;          /* 冰川蔚蓝 */
  --cryogenic-ice-sheen: rgba(255, 255, 255, 0.08);

  /* 默认：白天模式 (高寒纯净日光冰川风格 Arctic Daylight Crystalline) */
  --bg-body: #f3f8fc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --bg-card-subtle: #e9f2f8;
  --bg-crevasse: #0f2b48;
  
  --text-main: #061527;
  --text-muted: #476077;
  --text-subtle: #7994ab;
  --text-cyan-accent: #009e89;

  --border-light: rgba(15, 43, 72, 0.1);
  --border-card: rgba(15, 43, 72, 0.12);
  --border-ice: rgba(0, 158, 137, 0.35);
  --border-fracture: rgba(0, 245, 212, 0.4);

  --shadow-sm: 0 2px 4px rgba(6, 21, 39, 0.04);
  --shadow-md: 0 6px 16px -2px rgba(6, 21, 39, 0.07);
  --shadow-lg: 0 16px 36px -6px rgba(6, 21, 39, 0.1);
  --shadow-cryo: 0 0 25px rgba(0, 158, 137, 0.22);
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #00b49e 100%);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  --nav-height: 74px;
  --transition-smooth: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-snap: all 0.12s cubic-bezier(0, 0, 0.2, 1);
}

/* 夜间模式：深海黑冰与极地夜光极冻奢华 (Abyssal Black Ice & Cryogenic Night) */
[data-theme="dark"] {
  --bg-body: #05070a;
  --bg-surface: #0a111a;
  --bg-surface-elevated: #0f1c2b;
  --bg-glass: rgba(5, 7, 10, 0.85);
  --bg-card-subtle: rgba(15, 43, 72, 0.3);
  --bg-crevasse: #05070a;

  --text-main: #f0f7fc;
  --text-muted: #8aa7c2;
  --text-subtle: #56728d;
  --text-cyan-accent: #00f5d4;

  --border-light: rgba(255, 255, 255, 0.07);
  --border-card: rgba(56, 189, 248, 0.15);
  --border-ice: rgba(0, 245, 212, 0.3);
  --border-fracture: rgba(0, 245, 212, 0.6);

  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 20px 48px -8px rgba(0, 0, 0, 0.85);
  --shadow-cryo: 0 0 35px rgba(0, 245, 212, 0.35);
  --accent-gradient: linear-gradient(135deg, #0ea5e9 0%, #00f5d4 100%);
}

/* --- 2. 基础重置与极地排版 --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 24px);
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-body);
  color: var(--text-main);
  transition: background-color 0.4s ease, color 0.4s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
}

/* 页面背景微妙冰裂纹理与微光溢出效果 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(ellipse at 50% 0%, rgba(0, 245, 212, 0.06) 0%, transparent 60%),
    radial-gradient(circle at 85% 30%, rgba(15, 43, 72, 0.15) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

[data-theme="dark"] body::before {
  background-image: 
    radial-gradient(ellipse at 50% 0%, rgba(0, 245, 212, 0.12) 0%, transparent 65%),
    radial-gradient(circle at 85% 30%, rgba(15, 43, 72, 0.4) 0%, transparent 50%);
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

ul {
  list-style: none;
}

img, svg {
  vertical-align: middle;
  max-width: 100%;
  height: auto;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 锚点目标高亮动态提示 (Target Dynamic Glow) */
:target {
  animation: targetPulse 1.8s ease-out;
}

@keyframes targetPulse {
  0% { outline: 2px solid var(--cryogenic-cyan); outline-offset: 8px; }
  100% { outline: 2px solid transparent; outline-offset: 16px; }
}

/* 标题规范 */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-cyan-accent);
  background: var(--cryogenic-cyan-dim);
  border: 1px solid var(--border-ice);
  border-radius: var(--radius-full);
  margin-bottom: 18px;
  backdrop-filter: blur(8px);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 16px;
  letter-spacing: -0.03em;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* --- 3. 极地冰川页眉导航栏 (Glacial Header) --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: var(--transition-smooth);
}

.navbar .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.brand-logo .logo-ice-gem {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #0a1b2e 0%, #0f2b48 50%, #00f5d4 100%);
  border: 1px solid var(--border-fracture);
  color: #ffffff;
  border-radius: 10px;
  box-shadow: 0 0 16px var(--cryogenic-cyan-glow);
  font-weight: 900;
  font-size: 1.1rem;
  position: relative;
  overflow: hidden;
}

.brand-logo .logo-ice-gem::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(60deg, transparent, rgba(255,255,255,0.4), transparent);
  transform: rotate(30deg);
  animation: iceShine 4.5s infinite linear;
}

@keyframes iceShine {
  0% { transform: translateX(-100%) rotate(30deg); }
  25%, 100% { transform: translateX(100%) rotate(30deg); }
}

.brand-name-tag {
  color: var(--text-cyan-accent);
  margin-right: 4px;
}

/* 导航链接目录 (包含首页、各板块以及新增的“推荐资讯”) */
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 8px 2px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-cyan-accent);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-gradient);
  box-shadow: 0 0 8px var(--cryogenic-cyan);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

/* 推荐资讯特殊徽标高亮 */
.nav-link-news {
  position: relative;
}

.nav-link-news .news-dot {
  width: 6px;
  height: 6px;
  background: var(--cryogenic-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--cryogenic-cyan);
  display: inline-block;
  margin-left: 2px;
}

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

/* 昼夜切换按钮 (精致毛玻璃、极地冰晶质感、无生硬粗糙 Emoji) */
.theme-toggle-btn {
  background: rgba(15, 43, 72, 0.08);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-sm);
  outline: none;
}

[data-theme="dark"] .theme-toggle-btn {
  background: rgba(15, 43, 72, 0.4);
  border-color: var(--border-ice);
  box-shadow: 0 0 14px rgba(0, 245, 212, 0.15);
}

.theme-toggle-btn:hover {
  border-color: var(--cryogenic-cyan);
  transform: translateY(-1px);
  box-shadow: 0 0 20px var(--cryogenic-cyan-dim);
}

.theme-toggle-btn svg {
  width: 17px;
  height: 17px;
  stroke: var(--text-cyan-accent);
  transition: transform 0.4s ease;
}

.theme-icon-dark { display: none; }
.theme-icon-light { display: block; }

[data-theme="dark"] .theme-icon-dark { display: block; }
[data-theme="dark"] .theme-icon-light { display: none; }

/* --- 4. 按钮体系 (严苛 CTA 规范) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 12px 26px;
  border-radius: var(--radius-full);
  cursor: pointer;
  border: none;
  transition: var(--transition-smooth);
  min-height: 46px;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

/* 极地冰川裂纹快门按钮 (Crystalline Snap Button) */
.btn-primary {
  background: var(--accent-gradient);
  color: #05070a !important;
  font-weight: 800;
  box-shadow: 0 4px 18px var(--cryogenic-cyan-glow);
}

[data-theme="dark"] .btn-primary {
  color: #05070a !important;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--cryogenic-cyan-glow);
  filter: brightness(1.08);
}

.btn-primary:active {
  transform: scale(0.97);
  box-shadow: 0 0 10px var(--cryogenic-cyan);
}

.btn-outline {
  background: rgba(15, 43, 72, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-card);
}

[data-theme="dark"] .btn-outline {
  background: rgba(15, 43, 72, 0.35);
  border-color: var(--border-ice);
}

.btn-outline:hover {
  border-color: var(--cryogenic-cyan);
  color: var(--text-cyan-accent);
  background: var(--cryogenic-cyan-dim);
  box-shadow: 0 0 20px var(--cryogenic-cyan-dim);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
  min-height: 38px;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
  min-height: 54px;
}

/* --- 5. 主视觉区 (Hero Section - 纵向发光冰缝巨构 Monolithic Crevasse) --- */
.hero-section {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 80px;
  position: relative;
  text-align: center;
  overflow: hidden;
}

/* 纵向贯穿的纤细发光冰缝折线 (Vertical Illuminated Glacial Fracture Vector) */
.hero-crevasse-fracture {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, 
    transparent 0%, 
    rgba(0, 245, 212, 0.1) 15%, 
    rgba(0, 245, 212, 0.8) 45%, 
    rgba(56, 189, 248, 0.9) 65%, 
    rgba(0, 245, 212, 0.15) 90%, 
    transparent 100%
  );
  box-shadow: 
    0 0 15px rgba(0, 245, 212, 0.5),
    0 0 45px rgba(15, 43, 72, 0.8);
  pointer-events: none;
  z-index: 0;
}

/* 冰川深渊负空间发光渗出层 (Deep Sub-surface Bleed) */
.hero-subsurface-bleed {
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translateX(-50%);
  width: 850px;
  height: 480px;
  background: radial-gradient(ellipse at center, rgba(0, 245, 212, 0.15) 0%, rgba(15, 43, 72, 0.35) 45%, transparent 75%);
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
}

[data-theme="dark"] .hero-subsurface-bleed {
  background: radial-gradient(ellipse at center, rgba(0, 245, 212, 0.22) 0%, rgba(15, 43, 72, 0.6) 45%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
}

.hero-notice {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  background: var(--bg-surface);
  border: 1px solid var(--border-ice);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  margin-bottom: 28px;
}

.hero-notice .ice-crystal-dot {
  width: 9px;
  height: 9px;
  background: var(--cryogenic-cyan);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  box-shadow: 0 0 10px var(--cryogenic-cyan);
  animation: cryoBlink 2.2s infinite ease-in-out;
}

@keyframes cryoBlink {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.35); box-shadow: 0 0 16px var(--cryogenic-cyan); }
}

/* 醒目大标题（必须包含品牌名 TAG） */
.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
}

.text-ice-gradient {
  background: linear-gradient(135deg, var(--text-main) 0%, var(--text-cyan-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="dark"] .text-ice-gradient {
  background: linear-gradient(135deg, #ffffff 15%, #00f5d4 85%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 25px rgba(0, 245, 212, 0.35));
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 38px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 46px;
  flex-wrap: wrap;
}

/* --- 6. 区域专线“冰封解冻”互动测速胶囊 (Regional Route Thawing Micro-Interactions) --- */
.route-thawing-section {
  margin-top: 36px;
  margin-bottom: 24px;
}

.route-thawing-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-subtle);
  margin-bottom: 14px;
}

.route-pills-container {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* 节点胶囊基底：磨砂冰板 */
.route-pill {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-full);
  padding: 10px 20px;
  font-size: 0.875rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-sm);
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.route-pill::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(0, 245, 212, 0.12), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* 悬停解冻状态 (Hovering gently thaws the frosted surface, unveiling crystal-clear ASN) */
.route-pill:hover {
  transform: translateY(-3px) scale(1.02);
  border-color: var(--cryogenic-cyan);
  box-shadow: 0 0 20px var(--cryogenic-cyan-dim), var(--shadow-md);
  background: var(--bg-surface-elevated);
}

.route-pill:hover::before {
  opacity: 1;
}

/* 点击时的冰晶清脆断裂动效 (Crystalline Snap) */
.route-pill:active {
  transform: scale(0.96);
  border-color: #ffffff;
  box-shadow: 0 0 28px var(--cryogenic-cyan);
}

.route-flag {
  font-weight: 800;
  color: var(--text-cyan-accent);
}

.route-location {
  font-weight: 700;
  color: var(--text-main);
}

.route-latency {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.8rem;
  color: #10b981;
  background: rgba(16, 185, 129, 0.1);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

/* 隐藏在冰层下的原生住宅 ASN 标签（解冻后晶莹浮现） */
.route-asn-tag {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.75rem;
  color: var(--text-cyan-accent);
  border-left: 1px solid var(--border-light);
  padding-left: 8px;
  opacity: 0.75;
  transition: opacity 0.3s ease;
}

.route-pill:hover .route-asn-tag {
  opacity: 1;
  color: var(--text-cyan-accent);
  text-shadow: 0 0 8px var(--cryogenic-cyan-glow);
}

.route-zero-loss {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-subtle);
}

.route-pill:hover .route-zero-loss {
  color: #10b981;
}

/* 指标条 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 940px;
  margin: 36px auto 0;
  padding: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(16px);
}

.stat-item {
  text-align: center;
  border-right: 1px solid var(--border-light);
}

.stat-item:last-child {
  border-right: none;
}

.stat-value {
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.2;
}

.stat-value span {
  font-size: 1.15rem;
  color: var(--text-cyan-accent);
  margin-left: 2px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- 7. 产品核心优势介绍 (3个图文卡片 - 磨砂冰盖反射卡) --- */
.section-padding {
  padding: 88px 0;
  position: relative;
}

.section-alt {
  background: var(--bg-card-subtle);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 40px 30px;
  transition: var(--transition-smooth);
  position: relative;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  backdrop-filter: blur(16px);
}

/* 冰川次表面光学反射 (Sub-surface Optical Shader Simulation) */
.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cryogenic-cyan), transparent);
  opacity: 0;
  transition: opacity 0.35s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px -10px var(--cryogenic-cyan-dim), var(--shadow-lg);
  border-color: var(--border-fracture);
}

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

.feature-icon-box {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: var(--cryogenic-cyan-dim);
  border: 1px solid var(--border-ice);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-cyan-accent);
  margin-bottom: 24px;
  transition: var(--transition-smooth);
}

.feature-card:hover .feature-icon-box {
  background: var(--accent-gradient);
  color: #05070a;
  box-shadow: 0 0 20px var(--cryogenic-cyan-glow);
  transform: scale(1.06);
}

.feature-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.feature-list li svg {
  color: var(--text-cyan-accent);
  flex-shrink: 0;
}

/* --- 8. 流媒体图卡 & AI 支持图卡 --- */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 38px;
  box-shadow: var(--shadow-md);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.showcase-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-fracture);
  box-shadow: 0 15px 35px var(--cryogenic-cyan-dim);
}

.showcase-header {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 22px;
}

.showcase-badge-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #0a1b2e 0%, #0f2b48 50%, #00f5d4 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  flex-shrink: 0;
  border: 1px solid var(--border-ice);
  box-shadow: 0 0 16px var(--cryogenic-cyan-dim);
}

.showcase-card-title {
  font-size: 1.48rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

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

.showcase-tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0;
}

.showcase-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-light);
  padding: 8px 14px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  transition: var(--transition-smooth);
}

.showcase-tag:hover {
  border-color: var(--cryogenic-cyan);
  background: var(--cryogenic-cyan-dim);
  color: var(--text-cyan-accent);
}

.showcase-highlight-box {
  background: var(--bg-card-subtle);
  border-left: 3px solid var(--text-cyan-accent);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* --- 9. 清晰套餐价格对比表 (参考网上真实 TAG 机场资费) --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 34px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-ice);
}

/* 进阶热销推荐款 (Featured Polar Star) */
.pricing-card.featured {
  border-color: var(--cryogenic-cyan);
  background: var(--bg-surface-elevated);
  box-shadow: 0 16px 40px -10px var(--cryogenic-cyan-dim);
  transform: scale(1.02);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: scale(1.04) translateY(-6px);
  box-shadow: 0 20px 48px -6px var(--cryogenic-cyan-glow);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #05070a;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  box-shadow: 0 0 16px var(--cryogenic-cyan-glow);
  text-transform: uppercase;
  white-space: nowrap;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 44px;
  margin-bottom: 18px;
  line-height: 1.5;
}

.plan-price-box {
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-light);
}

.plan-currency {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
}

.plan-price {
  font-size: 2.7rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
}

.plan-cycle {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

.plan-features-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-features-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-main);
}

.plan-features-list li svg {
  color: var(--text-cyan-accent);
  flex-shrink: 0;
}

.plan-features-list li.disabled {
  color: var(--text-subtle);
  text-decoration: line-through;
}

.plan-features-list li.disabled svg {
  color: var(--text-subtle);
}

.pricing-guarantee {
  text-align: center;
  margin-top: 40px;
  font-size: 0.92rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

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

.review-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

.review-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-fracture);
  box-shadow: 0 16px 36px var(--cryogenic-cyan-dim);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #00f5d4;
  margin-bottom: 16px;
  text-shadow: 0 0 10px var(--cryogenic-cyan-glow);
}

[data-theme="light"] .review-stars {
  color: #009e89;
  text-shadow: none;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-ice);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--text-cyan-accent);
  font-size: 1rem;
}

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

.review-info-role {
  font-size: 0.8rem;
  color: var(--text-subtle);
}

/* --- 11. 常见问题解答 (FAQ) --- */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-item:hover {
  border-color: var(--border-ice);
}

.faq-header {
  width: 100%;
  text-align: left;
  padding: 22px 26px;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  cursor: pointer;
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-main);
  outline: none;
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  transition: transform 0.35s ease;
  flex-shrink: 0;
  color: var(--text-cyan-accent);
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
  padding: 0 26px;
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.75;
}

.faq-item.active .faq-content {
  padding-bottom: 24px;
}

/* --- 12. 呼吁转化横幅 (Bottom CTA Banner) --- */
.bottom-cta-banner {
  background: linear-gradient(135deg, #0a1b2e 0%, #0f2b48 60%, #00f5d4 120%);
  border: 1px solid var(--border-fracture);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  color: #ffffff;
  margin: 48px 0 24px;
  box-shadow: 0 20px 50px -10px var(--cryogenic-cyan-dim);
  position: relative;
  overflow: hidden;
}

.bottom-cta-banner h2 {
  font-size: 2.3rem;
  font-weight: 900;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.bottom-cta-banner p {
  font-size: 1.15rem;
  opacity: 0.92;
  max-width: 660px;
  margin: 0 auto 32px;
}

.btn-ice-white {
  background: #ffffff;
  color: #05070a !important;
  font-weight: 800;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.btn-ice-white:hover {
  background: #f0fdfa;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px var(--cryogenic-cyan-glow);
}

/* --- 13. 页脚规范 (Footer - 严格只保留四个标题) --- */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-light);
  padding: 50px 0 38px;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 28px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-muted);
  position: relative;
  padding: 6px 4px;
}

.footer-nav-link:hover {
  color: var(--text-cyan-accent);
}

.footer-copyright {
  font-size: 0.86rem;
  color: var(--text-subtle);
  line-height: 1.6;
}

/* --- 14. 推荐资讯专页样式 (News / Insights Page) --- */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin: 40px 0;
}

.insight-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.insight-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-fracture);
  box-shadow: 0 16px 36px var(--cryogenic-cyan-dim);
}

.insight-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-subtle);
  margin-bottom: 14px;
}

.insight-category {
  color: var(--text-cyan-accent);
  background: var(--cryogenic-cyan-dim);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-weight: 700;
}

.insight-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 12px;
}

.insight-excerpt {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: 20px;
}

.insight-footer-link {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-cyan-accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.insight-footer-link:hover {
  text-decoration: underline;
}

/* --- 15. SEO 深度长篇文章专属排版系统 (Article Prose & Layout System) --- */
.article-wrapper {
  max-width: 900px;
  margin: 36px auto 70px;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 48px 42px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(16px);
  position: relative;
}

/* 面包屑导航 */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-subtle);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

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

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

.breadcrumb-sep {
  opacity: 0.5;
}

/* 文章头部 */
.article-header {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 28px;
  margin-bottom: 36px;
}

.article-header .article-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--cryogenic-cyan-dim);
  border: 1px solid var(--border-ice);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-cyan-accent);
  margin-bottom: 14px;
}

.article-header .article-title {
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1.32;
  color: var(--text-main);
  letter-spacing: -0.025em;
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.85rem;
  color: var(--text-subtle);
  flex-wrap: wrap;
}

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

/* 文章目录 (Table of Contents / TOC) */
.article-toc {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-card);
  border-left: 4px solid var(--text-cyan-accent);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 32px 0 40px;
}

.article-toc-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 18px;
}

.article-toc-list li {
  list-style: decimal;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.article-toc-list a {
  color: var(--text-main);
  font-weight: 600;
}

.article-toc-list a:hover {
  color: var(--text-cyan-accent);
  text-decoration: underline;
}

/* 文章正文排版 */
.article-body {
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 44px 0 18px;
  padding-left: 14px;
  border-left: 4px solid var(--text-cyan-accent);
  line-height: 1.35;
}

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

.article-body p {
  margin-bottom: 18px;
}

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

.article-body ul, .article-body ol {
  margin: 18px 0 24px 22px;
}

.article-body li {
  margin-bottom: 8px;
}

/* 强调说明框 (Callout Box) */
.article-callout {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-ice);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 26px 0;
}

.article-callout.tip {
  border-left: 4px solid var(--text-cyan-accent);
}

.article-callout.warn {
  border-left: 4px solid #f59e0b;
}

.article-callout h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

/* 参数对比数据表 */
.article-table-container {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.article-table th {
  background: var(--bg-card-subtle);
  color: var(--text-main);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-card);
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-muted);
}

.article-table tr:last-child td {
  border-bottom: none;
}

.article-table tr:hover td {
  background: rgba(0, 245, 212, 0.03);
}

/* 文章内嵌入式 CTA 引导 */
.article-cta-box {
  background: linear-gradient(135deg, rgba(10, 27, 46, 0.8) 0%, rgba(15, 43, 72, 0.9) 60%, rgba(0, 245, 212, 0.3) 100%);
  border: 1px solid var(--border-fracture);
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
  color: #ffffff;
  margin: 40px 0;
  box-shadow: 0 10px 30px var(--cryogenic-cyan-dim);
}

.article-cta-box h3 {
  color: #ffffff;
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.article-cta-box p {
  color: #d1e4f3;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

/* 文章专属 FAQ 区块 */
.article-faq-section {
  margin: 44px 0;
  border-top: 1px solid var(--border-light);
  padding-top: 36px;
}

.article-faq-item {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin-bottom: 14px;
}

.article-faq-q {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.article-faq-a {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 相关阅读推荐 */
.article-related-section {
  margin-top: 48px;
  border-top: 1px solid var(--border-light);
  padding-top: 36px;
}

.article-related-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 22px;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.article-related-card {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition-smooth);
}

.article-related-card:hover {
  border-color: var(--border-fracture);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.article-related-card a {
  font-weight: 700;
  font-size: 0.96rem;
  color: var(--text-main);
  line-height: 1.45;
  display: block;
}

.article-related-card a:hover {
  color: var(--text-cyan-accent);
}

.article-related-desc {
  font-size: 0.84rem;
  color: var(--text-subtle);
  margin-top: 6px;
}

/* --- 15. 响应式适配媒体查询 (@media) --- */
@media (max-width: 1100px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
}

@media (max-width: 900px) {
  .features-grid, .reviews-grid, .insights-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* 移动端顶部精简，优先聚焦操作与昼夜模式 */
  }

  .hero-section {
    padding-top: calc(var(--nav-height) + 30px);
    padding-bottom: 56px;
  }

  .hero-title {
    font-size: 2.25rem;
    line-height: 1.25;
  }

  .hero-subtitle {
    font-size: 1.05rem;
    margin-bottom: 30px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px;
  }

  .stat-item:nth-child(2) {
    border-right: none;
  }

  .stat-item:nth-child(3), .stat-item:nth-child(4) {
    border-top: 1px solid var(--border-light);
    padding-top: 14px;
  }

  .pricing-grid, .showcase-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .section-padding {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.9rem;
  }

  .btn-lg {
    width: 100%;
    font-size: 1rem;
    padding: 14px 24px;
  }

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

  .hero-cta-group .btn {
    width: 100%;
  }

  .route-pills-container {
    flex-direction: column;
    align-items: stretch;
  }

  .route-pill {
    justify-content: space-between;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .bottom-cta-banner {
    padding: 40px 22px;
  }

  .bottom-cta-banner h2 {
    font-size: 1.75rem;
  }
}