/* ==========================================================================
   耶耶云 (YeYe Cloud) - 天空之镜多维空间 UI 样式规范
   Ethereal Multi-layered Spatial UI Design System
   
   色彩美学：纯净天镜空间感，明澈白昼氛围。
   顶层天空青蓝 (#0284C7) 向下渐变融入天际线白 (#F8FAFC)
   无生硬厚边框，微光透润毛玻璃岛屿卡片，光学高光扫光 (Specular Sheen)
   网络遥测仪表 (Telemetry Meters)，零重力浮空动力学质感。
   严格禁止任何劣质魔法星星、火花或仙女棒。
   ========================================================================== */

:root {
  /* 白天模式规范 (默认)：天镜空灵，明澈白昼 */
  --sky-top: #0284c7;
  --sky-mid: #38bdf8;
  --sky-light: #e0f2fe;
  --bg-page: #f8fafc;
  
  --bg-island: rgba(255, 255, 255, 0.72);
  --bg-island-hover: rgba(255, 255, 255, 0.88);
  --bg-surface: #f0f7ff;
  --bg-nav: rgba(255, 255, 255, 0.75);
  
  --border-island: rgba(255, 255, 255, 0.8);
  --border-island-subtle: rgba(2, 132, 199, 0.12);
  --border-glow: rgba(56, 189, 248, 0.45);
  
  --text-main: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: rgba(2, 132, 199, 0.08);
  --primary-gradient: linear-gradient(135deg, #0284c7 0%, #2563eb 50%, #4f46e5 100%);
  --azure-gradient: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  --sky-mirror-bg: linear-gradient(180deg, #e0f2fe 0%, #f0f9ff 25%, #f8fafc 100%);
  
  --badge-bg: rgba(2, 132, 199, 0.08);
  --badge-text: #0284c7;
  --badge-border: rgba(2, 132, 199, 0.2);
  
  --shadow-island: 0 20px 40px -15px rgba(2, 132, 199, 0.07), 0 0 0 1px rgba(255, 255, 255, 0.7);
  --shadow-island-hover: 0 30px 60px -12px rgba(2, 132, 199, 0.18), 0 0 0 1px rgba(56, 189, 248, 0.4);
  --shadow-float: 0 25px 50px -12px rgba(2, 132, 199, 0.25);
  --shadow-telemetry: 0 15px 35px -5px rgba(2, 132, 199, 0.08);

  --toggle-bg: rgba(255, 255, 255, 0.8);
  --toggle-border: rgba(2, 132, 199, 0.2);
  --toggle-icon: #0284c7;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

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

[data-theme="dark"] {
  /* 夜间模式规范：深邃星空与发光极光网络 */
  --sky-top: #031326;
  --sky-mid: #0b1f3a;
  --sky-light: #0d274c;
  --bg-page: #070c14;
  
  --bg-island: rgba(15, 23, 42, 0.65);
  --bg-island-hover: rgba(22, 34, 60, 0.8);
  --bg-surface: #0e1726;
  --bg-nav: rgba(7, 12, 20, 0.8);
  
  --border-island: rgba(56, 189, 248, 0.15);
  --border-island-subtle: rgba(255, 255, 255, 0.06);
  --border-glow: rgba(56, 189, 248, 0.4);
  
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --primary: #38bdf8;
  --primary-hover: #7dd3fc;
  --primary-light: rgba(56, 189, 248, 0.12);
  --primary-gradient: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  --azure-gradient: linear-gradient(135deg, #0369a1 0%, #38bdf8 100%);
  --sky-mirror-bg: linear-gradient(180deg, #0b172a 0%, #070c14 100%);
  
  --badge-bg: rgba(56, 189, 248, 0.12);
  --badge-text: #38bdf8;
  --badge-border: rgba(56, 189, 248, 0.28);
  
  --shadow-island: 0 20px 40px -15px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.05);
  --shadow-island-hover: 0 30px 60px -12px rgba(2, 132, 199, 0.25), 0 0 0 1px rgba(56, 189, 248, 0.3);
  --shadow-float: 0 25px 50px -12px rgba(2, 132, 199, 0.3);
  --shadow-telemetry: 0 15px 35px -5px rgba(0, 0, 0, 0.4);

  --toggle-bg: rgba(15, 23, 42, 0.7);
  --toggle-border: rgba(56, 189, 248, 0.3);
  --toggle-icon: #38bdf8;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px; /* 锚点跳转平滑定位避让固定导航栏 */
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-page);
  background-image: var(--sky-mirror-bg);
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.68;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

ul, ol {
  list-style: none;
}

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

/* 优雅浮空毛玻璃卡片 (Translucent Frosted Sky-Island) */
.island-card {
  background: var(--bg-island);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-island);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-island);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

/* 阳光光学光泽 (Sunlight Specular Sheen Gliding Across Glass Edges) */
.island-card::after {
  content: "";
  position: absolute;
  top: -60%;
  left: -80%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    115deg,
    transparent 0%,
    transparent 40%,
    rgba(255, 255, 255, 0.18) 50%,
    transparent 60%,
    transparent 100%
  );
  transform: rotate(25deg);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
}

[data-theme="dark"] .island-card::after {
  background: linear-gradient(
    115deg,
    transparent 0%,
    transparent 42%,
    rgba(56, 189, 248, 0.12) 50%,
    transparent 58%,
    transparent 100%
  );
}

.island-card:hover {
  transform: translateY(-8px) perspective(1000px) rotateX(1deg);
  box-shadow: var(--shadow-island-hover);
  border-color: var(--border-glow);
}

.island-card:hover::after {
  opacity: 1;
  animation: opticSheen 2.2s infinite ease-in-out;
}

@keyframes opticSheen {
  0% { transform: translateX(-40%) rotate(25deg); }
  100% { transform: translateX(60%) rotate(25deg); }
}

/* 顶部导航栏 - 高级半透明空中浮岛 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-nav);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-island-subtle);
  transition: var(--transition-smooth);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: var(--azure-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(2, 132, 199, 0.3);
  position: relative;
  overflow: hidden;
}

.brand-name {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
}

/* 导航目录 (含首页、各板块锚点与新增“推荐资讯”) */
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-item {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 2px;
  transition: var(--transition-smooth);
}

.nav-item::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.3s ease, left 0.3s ease;
  border-radius: var(--radius-full);
}

.nav-item:hover {
  color: var(--primary);
}

.nav-item:hover::after,
.nav-item.active::after {
  width: 100%;
  left: 0;
}

/* “推荐资讯” 专属高亮光标徽章 */
.nav-item.highlight-nav {
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--badge-bg);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--badge-border);
}

.nav-item.highlight-nav:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

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

/* 精致半透明昼夜模式切换按钮 */
.theme-toggle-btn {
  background: var(--toggle-bg);
  border: 1px solid var(--toggle-border);
  border-radius: var(--radius-full);
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--toggle-icon);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: var(--transition-smooth);
  position: relative;
  outline: none;
}

.theme-toggle-btn:hover {
  border-color: var(--primary);
  transform: translateY(-2px) rotate(15deg);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.25);
}

.theme-icon-sun,
.theme-icon-moon {
  width: 20px;
  height: 20px;
  transition: transform 0.35s ease, opacity 0.35s ease;
  position: absolute;
}

[data-theme="light"] .theme-icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.4);
  pointer-events: none;
}
[data-theme="light"] .theme-icon-moon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

[data-theme="dark"] .theme-icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
}
[data-theme="dark"] .theme-icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.4);
  pointer-events: none;
}

/* 按钮通用体系 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-smooth);
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--azure-gradient);
  color: #ffffff !important;
  box-shadow: 0 6px 18px rgba(2, 132, 199, 0.32);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(2, 132, 199, 0.45);
}

.btn-outline {
  background: var(--bg-island);
  color: var(--text-main);
  border-color: var(--border-island-subtle);
  backdrop-filter: blur(10px);
}

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

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
}

.btn-full {
  width: 100%;
}

/* 主视觉区 (Hero Section) - 多层空间深度 Sky-mirror Layout */
.hero-section {
  position: relative;
  padding: 75px 0 65px 0;
  text-align: center;
  overflow: hidden;
}

/* 天空发光背景层 */
.hero-sky-glow {
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(56, 189, 248, 0.22) 0%, rgba(2, 132, 199, 0.08) 45%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

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

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: var(--bg-island);
  border: 1px solid var(--border-island-subtle);
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 24px;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.08);
  backdrop-filter: blur(12px);
}

.hero-title {
  font-size: 3.35rem;
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -1.2px;
  margin-bottom: 22px;
  color: var(--text-main);
}

.hero-title .brand-highlight {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  padding: 0 4px;
}

.hero-subtitle {
  font-size: 1.2rem;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px auto;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

/* 空间网络遥测中心 (Interactive Spatial Node Selector & Telemetry Station) */
.telemetry-station {
  max-width: 1040px;
  margin: 0 auto;
  padding: 28px;
  background: var(--bg-island);
  border: 1px solid var(--border-island);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-telemetry);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  text-align: left;
}

.telemetry-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-island-subtle);
  flex-wrap: wrap;
  gap: 12px;
}

.telemetry-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
}

.live-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  color: #10b981;
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.ping-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 rgba(16, 185, 129, 0.4);
  animation: pulse-green 1.8s infinite;
}

@keyframes pulse-green {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* 浮空岛屿节点选择器 (Interactive Floating Node Islands) */
.node-islands-tabs {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 16px;
  margin-bottom: 20px;
  scrollbar-width: thin;
}

.node-island-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-island-subtle);
  border-radius: var(--radius-md);
  padding: 10px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-smooth);
}

.node-island-btn:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

.node-island-btn.active {
  background: var(--azure-gradient);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 6px 16px rgba(2, 132, 199, 0.28);
}

/* 实时网络遥测指标仪表盘 (Telemetry Metric Cards) */
.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.telemetry-metric {
  background: var(--bg-surface);
  border: 1px solid var(--border-island-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.metric-value {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.2;
}

.metric-value.highlight {
  color: var(--primary);
}

.metric-unit {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 2px;
}

.metric-foot {
  font-size: 0.76rem;
  color: #10b981;
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 通用章节与板块排版 */
.section {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--primary);
  margin-bottom: 10px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.6px;
  margin-bottom: 14px;
  color: var(--text-main);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* 核心优势：3个图文浮岛卡片 (Features Grid) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-island {
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
}

.feature-icon-box {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: var(--azure-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  box-shadow: 0 6px 18px rgba(2, 132, 199, 0.25);
}

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

.feature-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.68;
}

.feature-points {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-point-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.point-icon {
  width: 18px;
  height: 18px;
  color: #10b981;
  flex-shrink: 0;
}

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

.showcase-island {
  padding: 40px 34px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.showcase-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
  margin-bottom: 18px;
  width: fit-content;
}

.showcase-title {
  font-size: 1.65rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.showcase-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 28px;
}

.pill-matrix {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}

.pill-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  background: var(--bg-surface);
  border: 1px solid var(--border-island-subtle);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  transition: var(--transition-smooth);
}

.pill-item:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
  transform: translateY(-2px);
}

.pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
}

.showcase-status-bar {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  border: 1px dashed var(--border-island-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9rem;
}

/* 套餐价格对比表 - 参考网上真实专线机场价格 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
  padding-top: 26px; /* 预留顶部悬浮徽章空间，防止文字被遮挡截断 */
}

.pricing-card {
  padding: 38px 26px 36px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: visible !important; /* 核心修复：允许顶部推荐徽章完整呈现，彻底杜绝任何边框裁切遮挡 */
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 即使父级卡片 overflow: visible，光学高光依然严苛约束在卡片圆角以内 */
.pricing-card::after {
  clip-path: inset(0 round var(--radius-lg));
}

/* 零重力漂浮动力学质感 (Zero-Gravity Hover Damping) */
.pricing-card:hover {
  transform: translateY(-12px) perspective(1000px) rotateX(1.5deg);
  box-shadow: var(--shadow-float);
}

.pricing-card.featured {
  border: 2px solid var(--primary);
  background: var(--bg-island-hover);
  box-shadow: var(--shadow-float);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-10px);
}

/* 顶部高光推荐徽章：精致立体悬浮，文字完整展现无任何遮挡 */
.pricing-ribbon {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--azure-gradient);
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 6px 16px rgba(2, 132, 199, 0.45);
  white-space: nowrap;
  z-index: 10;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  line-height: 1.3;
  border: 1px solid rgba(255, 255, 255, 0.7);
}

.plan-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text-main);
}

.plan-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  min-height: 42px;
  margin-bottom: 18px;
}

.plan-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-island-subtle);
}

.plan-symbol {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
}

.plan-cost {
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  letter-spacing: -1px;
}

.plan-duration {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.plan-specs {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-spec-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.plan-spec-item strong {
  color: var(--text-main);
}

/* 用户真实评价 (Testimonials) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-island {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.review-quote {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: normal;
}

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

.user-avatar-circle {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--azure-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.25);
}

.user-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-main);
}

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

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

.faq-island {
  background: var(--bg-island);
  border: 1px solid var(--border-island);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(16px);
  transition: var(--transition-smooth);
}

.faq-island:hover {
  border-color: var(--border-glow);
}

.faq-header {
  padding: 22px 26px;
  font-size: 1.08rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-main);
  user-select: none;
  list-style: none;
}

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

.faq-arrow {
  width: 22px;
  height: 22px;
  transition: transform 0.3s ease;
  color: var(--text-muted);
  flex-shrink: 0;
}

details[open] .faq-arrow {
  transform: rotate(180deg);
  color: var(--primary);
}

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

.faq-body {
  padding: 22px 26px;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--text-secondary);
  background: var(--bg-surface);
}

/* 底部 CTA 呼唤条幅 */
.cta-banner-island {
  background: var(--azure-gradient);
  border-radius: var(--radius-xl);
  padding: 65px 40px;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-float);
}

.cta-banner-island::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.25) 0%, transparent 60%);
  pointer-events: none;
}

.cta-banner-title {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.cta-banner-subtitle {
  font-size: 1.15rem;
  opacity: 0.95;
  max-width: 680px;
  margin: 0 auto 34px auto;
  line-height: 1.7;
}

.btn-white {
  background: #ffffff;
  color: #0369a1 !important;
  font-size: 1.05rem;
  padding: 14px 38px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.btn-white:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
}

/* 页脚 (严格只保留4个标题，且新页面打开) */
.footer {
  background: var(--bg-island);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-island-subtle);
  padding: 55px 0 35px 0;
  transition: var(--transition-smooth);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.footer-nav-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition-smooth);
  position: relative;
  padding: 4px 0;
}

.footer-nav-link:hover {
  color: var(--primary);
}

.footer-divider {
  width: 100%;
  height: 1px;
  background: var(--border-island-subtle);
  margin-bottom: 26px;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  text-align: center;
}

/* 推荐资讯与独立文章页专属排版 */
.content-page {
  padding: 60px 0 100px 0;
}

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

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 18px;
}

.back-link:hover {
  transform: translateX(-4px);
}

.content-title {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}

.content-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* 资讯列表网格 (News & Insights Grid) */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}

.insight-card {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.insight-category {
  color: var(--primary);
  font-weight: 700;
  background: var(--badge-bg);
  padding: 2px 10px;
  border-radius: var(--radius-full);
}

.insight-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.45;
}

.insight-snippet {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 20px;
}

.insight-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
}

.insight-read-more:hover {
  transform: translateX(4px);
}

/* 独立内容卡片文章排版 */
.article-island {
  padding: 44px 38px;
  margin-bottom: 30px;
}

.article-island h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 34px 0 16px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-island-subtle);
}

.article-island h2:first-child {
  margin-top: 0;
}

.article-island h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 22px 0 10px 0;
}

.article-island p {
  font-size: 0.98rem;
  line-height: 1.82;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.article-island ul, .article-island ol {
  margin: 12px 0 20px 24px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.article-island li {
  margin-bottom: 10px;
}

.highlight-box {
  background: var(--bg-surface);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 20px 22px;
  margin: 22px 0;
  font-size: 0.96rem;
  color: var(--text-secondary);
}

.highlight-box strong {
  color: var(--text-main);
}

/* 文章专属目录 (Table of Contents) */
.article-toc {
  background: var(--bg-surface);
  border: 1px solid var(--border-island-subtle);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 24px 0 32px 0;
}

.toc-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0 !important;
  list-style: none !important;
  padding-left: 0 !important;
}

.toc-item a {
  color: var(--text-secondary);
  font-size: 0.94rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-smooth);
}

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

/* 文章内部代码块与配置展示 */
.code-block {
  background: var(--bg-surface);
  border: 1px solid var(--border-island-subtle);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin: 16px 0 22px 0;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-main);
}

/* 官网内链高亮卡片 (SEO Internal Link Callout) */
.brand-internal-link-card {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.08) 0%, rgba(56, 189, 248, 0.04) 100%);
  border: 1.5px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 24px 26px;
  margin: 32px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.brand-internal-link-text h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.brand-internal-link-text p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 0 !important;
}

/* 延伸阅读 / 相关阅读 (Related Reading) */
.related-reading-section {
  margin-top: 45px;
  padding-top: 30px;
  border-top: 1px solid var(--border-island-subtle);
}

.related-reading-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.related-reading-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-island-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-reading-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(2, 132, 199, 0.1);
}

.related-reading-card h5 {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.45;
}

.related-reading-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px !important;
  line-height: 1.5;
}

.related-reading-card .read-link {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 网站地图网格 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.sitemap-card {
  padding: 26px;
}

.sitemap-card h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sitemap-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sitemap-links a {
  color: var(--text-secondary);
  font-size: 0.94rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sitemap-links a:hover {
  color: var(--primary);
  transform: translateX(5px);
}

/* ==========================================================================
   移动端与全端响应式适配媒体查询 (@media)
   ========================================================================== */
@media (max-width: 1080px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }
  .telemetry-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 868px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  .dual-showcase-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .insights-grid {
    grid-template-columns: 1fr;
  }
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-wrapper {
    height: 66px;
  }
  .nav-links {
    display: none; /* 移动端突出关键注册与昼夜切换 */
  }
  .hero-title {
    font-size: 2.3rem;
    line-height: 1.25;
  }
  .hero-subtitle {
    font-size: 1.05rem;
    margin-bottom: 30px;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }
  .telemetry-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 20px;
  }
  .pricing-card.featured {
    margin-top: 10px;
    margin-bottom: 6px;
  }
  .pricing-ribbon {
    font-size: 0.76rem;
    padding: 5px 14px;
    top: -14px;
  }
  .section {
    padding: 60px 0;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .cta-banner-island {
    padding: 42px 22px;
  }
  .cta-banner-title {
    font-size: 1.85rem;
  }
  .cta-banner-island .btn {
    width: 100%;
    min-height: 48px;
  }
  .footer-nav {
    flex-direction: column;
    gap: 20px;
  }
  .article-island {
    padding: 26px 20px;
  }
  .content-title {
    font-size: 1.9rem;
  }
}