/* ==========================================================================
   蓝帆云 (lanfanyun.buzz) - 爱琴海纯净日光航海美学 UI 样式表
   Aegean Maritime Pure-Daylight UI Design
   石灰岩纯白背景 (#fdfdfd) / 爱琴海深钴蓝 (#0055a5) / 亚麻帆布暖调
   ========================================================================== */

:root {
  /* 白天模式 (默认)：日光倾泻的地中海纯净质感 */
  --bg-body: #fdfdfd;
  --bg-card: #ffffff;
  --bg-card-hover: #fbfbfa;
  --bg-glass: rgba(253, 253, 253, 0.88);
  --bg-subtle: #f8f6f0; /* 日晒亚麻帆布暖调底层 */
  --bg-sail-canvas: #f5f2ea;
  --border-color: #e5dfd5;
  --border-light: rgba(229, 223, 213, 0.7);
  --border-accent: rgba(0, 85, 165, 0.2);
  
  --text-main: #0c2340; /* 爱琴海深海藏蓝 */
  --text-muted: #476282;
  --text-light: #7e9bbd;
  
  --aegean-blue: #0055a5; /* 爱琴海深钴蓝 */
  --aegean-deep: #003b73;
  --aegean-sky: #0ea5e9;
  --aegean-azure: #38bdf8;
  --aegean-shimmer: rgba(0, 85, 165, 0.08);
  
  --linen-cloth: #f1ede4;
  --linen-accent: #c4975c; /* 地中海金沙/帆缆饰色 */
  --badge-bg: rgba(0, 85, 165, 0.07);
  --badge-text: #0055a5;

  --shadow-sm: 0 2px 4px rgba(12, 35, 64, 0.04);
  --shadow-md: 0 8px 20px rgba(12, 35, 64, 0.06), 0 2px 6px rgba(0, 85, 165, 0.04);
  --shadow-lg: 0 20px 45px -10px rgba(12, 35, 64, 0.1), 0 1px 3px rgba(0, 85, 165, 0.08);
  --shadow-sail: 0 24px 50px -12px rgba(0, 85, 165, 0.16), 0 4px 12px rgba(196, 151, 92, 0.08);
  --shadow-glow: 0 0 25px rgba(0, 85, 165, 0.18);

  --accent-gradient: linear-gradient(135deg, #0055a5 0%, #0284c7 100%);
  --accent-gradient-text: linear-gradient(135deg, #004080 0%, #0055a5 50%, #0284c7 100%);
  --sail-border-radius: 18px;
  --transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  /* 夜间模式：爱琴海静谧子夜 (Aegean Midnight) */
  --bg-body: #061325;
  --bg-card: #0c1d34;
  --bg-card-hover: #112642;
  --bg-glass: rgba(12, 29, 52, 0.88);
  --bg-subtle: #08172c;
  --bg-sail-canvas: #0f243e;
  --border-color: #173052;
  --border-light: rgba(56, 189, 248, 0.12);
  --border-accent: rgba(56, 189, 248, 0.35);
  
  --text-main: #f4f8fc;
  --text-muted: #8eaecf;
  --text-light: #5d7e9e;
  
  --aegean-blue: #38bdf8;
  --aegean-deep: #0ea5e9;
  --aegean-sky: #60a5fa;
  --aegean-azure: #93c5fd;
  --aegean-shimmer: rgba(56, 189, 248, 0.12);
  
  --linen-cloth: #152b47;
  --linen-accent: #e0b06b;
  --badge-bg: rgba(56, 189, 248, 0.15);
  --badge-text: #7dd3fc;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.65);
  --shadow-sail: 0 25px 50px -10px rgba(0, 0, 0, 0.7), 0 0 25px rgba(56, 189, 248, 0.15);
  --shadow-glow: 0 0 30px rgba(56, 189, 248, 0.25);

  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  --accent-gradient-text: linear-gradient(135deg, #60a5fa 0%, #38bdf8 50%, #93c5fd 100%);
}

/* ==========================================================================
   全局重置与水波涟漪背景 (Water-Caustics Shimmer)
   ========================================================================== */
*, *::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: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.7;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 随鼠标移动的爱琴海水光波纹微动效 (Water-caustics light shimmer) */
.water-caustics-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(
    650px circle at var(--mouse-x, 50%) var(--mouse-y, 30%),
    var(--aegean-shimmer) 0%,
    transparent 65%
  );
  transition: background 0.15s ease-out;
}

/* 地中海帆影轻纱微弱线条背景 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(0, 85, 165, 0.03) 0%, transparent 40%),
    radial-gradient(circle at 90% 70%, rgba(196, 151, 92, 0.04) 0%, transparent 45%);
  pointer-events: none;
  z-index: 0;
}

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

img, svg {
  vertical-align: middle;
}

ul, ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   页眉导航栏 (Site Header & Navigation)
   包含首页、核心优势、流媒体、AI加速、套餐方案、口碑、FAQ、以及新增的【推荐资讯】
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  box-shadow: 0 4px 20px rgba(0, 85, 165, 0.03);
  transition: var(--transition);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 20px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.3px;
  color: var(--text-main);
  flex-shrink: 0;
}

.brand-logo-img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: contain;
  box-shadow: 0 4px 12px rgba(91, 142, 255, 0.32);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.35s ease;
  display: block;
}

.brand-logo:hover .brand-logo-img {
  transform: rotate(4deg) scale(1.06);
  box-shadow: 0 6px 20px rgba(91, 142, 255, 0.48);
}

.brand-logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px rgba(0, 85, 165, 0.28);
}

.brand-logo-icon svg {
  width: 22px;
  height: 22px;
}

.brand-title-text {
  display: flex;
  flex-direction: column;
}

.brand-title-cn {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.2;
}

.brand-title-en {
  font-size: 0.65rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: nowrap;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 6px 4px;
  white-space: nowrap;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 100%;
  height: 2px;
  background: var(--aegean-blue);
  border-radius: 2px;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover {
  color: var(--aegean-blue);
}

.nav-link:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: rgba(0, 85, 165, 0.08);
  border: 1px solid var(--border-accent);
  border-radius: 20px;
  color: var(--aegean-blue);
  font-weight: 700;
}

.nav-link-badge:hover {
  background: var(--aegean-blue);
  color: #ffffff;
}

.nav-link-badge:hover::after {
  display: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

/* ==========================================================================
   精致透明昼夜切换按钮 (Day/Night Theme Toggle)
   ========================================================================== */
.theme-toggle-btn {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid var(--border-color);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.theme-toggle-btn:hover {
  color: var(--aegean-blue);
  border-color: var(--aegean-blue);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.theme-icon-sun, .theme-icon-moon {
  position: absolute;
  width: 20px;
  height: 20px;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

/* 默认白天模式 (light) */
[data-theme="light"] .theme-icon-sun,
:root:not([data-theme="dark"]) .theme-icon-sun {
  opacity: 0;
  transform: scale(0.6) rotate(-90deg);
}
[data-theme="light"] .theme-icon-moon,
:root:not([data-theme="dark"]) .theme-icon-moon {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

[data-theme="dark"] .theme-icon-moon {
  opacity: 0;
  transform: scale(0.6) rotate(90deg);
}
[data-theme="dark"] .theme-icon-sun {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

/* ==========================================================================
   按钮体系 (Buttons)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(0, 85, 165, 0.28);
}

.btn-primary:hover {
  box-shadow: 0 8px 25px rgba(0, 85, 165, 0.42);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--bg-subtle);
  border-color: var(--aegean-blue);
  color: var(--aegean-blue);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.05rem;
  border-radius: 12px;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   主视觉区 (Hero Section - Oceanside Modernist Pavilion)
   大标题明确包含品牌名“蓝帆云”，搭配副标题与详尽简介
   ========================================================================== */
.hero-section {
  padding: 90px 0 70px;
  text-align: center;
  position: relative;
}

.hero-badge-wrap {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 18px;
  background: var(--badge-bg);
  border: 1px solid var(--border-accent);
  border-radius: 100px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--badge-text);
  margin-bottom: 28px;
  box-shadow: 0 2px 10px rgba(0, 85, 165, 0.05);
}

.maritime-dot {
  width: 8px;
  height: 8px;
  background-color: #0284c7;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(2, 132, 199, 0.7);
  animation: pulse-wave 2.2s infinite;
}

@keyframes pulse-wave {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(2, 132, 199, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(2, 132, 199, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(2, 132, 199, 0); }
}

/* 大标题必须明确包含“蓝帆云”品牌名 */
.hero-headline {
  font-size: 3.4rem;
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: -1.2px;
  margin-bottom: 22px;
  color: var(--text-main);
}

.hero-headline .brand-highlight {
  background: var(--accent-gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  position: relative;
}

.hero-headline .brand-highlight::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 4px;
  width: 100%;
  height: 6px;
  background: rgba(0, 85, 165, 0.12);
  border-radius: 3px;
  z-index: -1;
}

.hero-subtitle {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--aegean-blue);
  margin-bottom: 16px;
  letter-spacing: -0.2px;
}

/* 主视觉区详尽简介 */
.hero-intro-desc {
  font-size: 1.08rem;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 38px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 54px;
}

/* 航海风微晶数据条 */
.hero-stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
  padding: 28px 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  box-shadow: var(--shadow-md);
}

.stat-box {
  text-align: center;
  position: relative;
}

.stat-box:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -12px;
  top: 15%;
  height: 70%;
  width: 1px;
  background: var(--border-light);
}

.stat-val {
  font-size: 2rem;
  font-weight: 900;
  color: var(--aegean-blue);
  line-height: 1.15;
  margin-bottom: 4px;
}

.stat-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ==========================================================================
   区块通用架构
   ========================================================================== */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 54px;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--aegean-blue);
  letter-spacing: 1.5px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 900;
  letter-spacing: -0.6px;
  color: var(--text-main);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   产品核心优势卡片 (Core Advantages - 3 Cards)
   完全去除机器人物化图标，采用高雅几何航海风与光纤专线矢量
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--sail-border-radius);
  padding: 40px 32px;
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--aegean-blue);
  box-shadow: var(--shadow-sail);
}

.feature-icon-sphere {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-accent);
  color: var(--aegean-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 26px;
  transition: var(--transition);
}

.feature-card:hover .feature-icon-sphere {
  background: var(--aegean-blue);
  color: #ffffff;
  transform: scale(1.05);
}

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

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-main);
}

.feature-text {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ==========================================================================
   流媒体图卡 & AI 支持图卡 (Showcase Cards)
   完全杜绝 AI 机器人图标，采用纯净认知光晕、星轨神经与多维流媒体
   ========================================================================== */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 22px;
  padding: 40px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.showcase-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--accent-gradient);
  opacity: 0.9;
}

.showcase-card:hover {
  border-color: var(--aegean-blue);
  box-shadow: var(--shadow-sail);
  transform: translateY(-4px);
}

.showcase-header {
  margin-bottom: 26px;
}

.showcase-tag {
  display: inline-block;
  padding: 5px 14px;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--border-accent);
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 800;
  margin-bottom: 16px;
}

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

.showcase-intro {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.services-cloud-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 28px;
}

.service-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  transition: var(--transition);
}

.service-pill:hover {
  background: var(--aegean-blue);
  color: #ffffff;
  border-color: var(--aegean-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 85, 165, 0.2);
}

.service-pill svg {
  width: 18px;
  height: 18px;
}

.showcase-checklist {
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.checklist-item svg {
  width: 18px;
  height: 18px;
  color: #0284c7;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ==========================================================================
   套餐价格对比表 (Pricing Tiers)
   参考网上真实专线套餐价格：
   - 随风扬起 3D 浮动面板微动效 (Breezy linen-textured floating boards with soft 3D physics)
   ========================================================================== */
.pricing-section {
  perspective: 1200px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

/* 扬帆微动物理拟真卡片 */
.pricing-board {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 42px 34px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.5s ease, border-color 0.3s ease;
  transform-style: preserve-3d;
  box-shadow: var(--shadow-md);
}

/* 悬停时模拟如帆船迎着离岸海风轻扬的 3D 浮动感 */
.pricing-board:hover {
  transform: translateY(-10px) rotateX(2deg) rotateY(-1.5deg);
  border-color: var(--aegean-blue);
  box-shadow: var(--shadow-sail);
}

.pricing-board.featured-plan {
  border: 2px solid var(--aegean-blue);
  box-shadow: 0 16px 40px -8px rgba(0, 85, 165, 0.22);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-board.featured-plan:hover {
  transform: scale(1.03) translateY(-10px) rotateX(2.5deg) rotateY(-1deg);
}

.sail-badge-top {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #ffffff;
  padding: 5px 18px;
  font-size: 0.78rem;
  font-weight: 800;
  border-radius: 20px;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(0, 85, 165, 0.35);
  white-space: nowrap;
}

.plan-head {
  margin-bottom: 24px;
}

.plan-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
}

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

.plan-price-block {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 22px 0;
}

.plan-currency {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--aegean-blue);
}

.plan-price-num {
  font-size: 3.3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  letter-spacing: -1px;
}

.plan-cycle {
  font-size: 0.92rem;
  color: var(--text-muted);
  font-weight: 600;
}

.plan-features-list {
  flex-grow: 1;
  margin-bottom: 34px;
  border-top: 1px solid var(--border-light);
  padding-top: 26px;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.plan-feature-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.94rem;
  color: var(--text-main);
}

.plan-feature-row svg {
  width: 18px;
  height: 18px;
  color: #0284c7;
  flex-shrink: 0;
}

.plan-feature-row strong {
  color: var(--aegean-blue);
}

/* ==========================================================================
   真实用户口碑 (Testimonials)
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--sail-border-radius);
  padding: 34px 30px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

.testimonial-card:hover {
  transform: translateY(-6px);
  border-color: var(--aegean-blue);
  box-shadow: var(--shadow-md);
}

.star-rating {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 18px;
}

.star-rating svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.testimonial-quote {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 24px;
}

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

.user-monogram {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 1.05rem;
  box-shadow: 0 4px 10px rgba(0, 85, 165, 0.2);
}

.user-meta h4 {
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--text-main);
}

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

/* ==========================================================================
   常见问题解答 (FAQ)
   ========================================================================== */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-card:hover {
  border-color: var(--aegean-blue);
}

.faq-toggle-title {
  padding: 22px 26px;
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-arrow {
  width: 20px;
  height: 20px;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  color: var(--text-muted);
  flex-shrink: 0;
}

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

.faq-content {
  padding: 0 26px 24px;
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ==========================================================================
   转化横幅 (Sunlit CTA Banner)
   ========================================================================== */
.cta-banner-pavilion {
  margin: 70px 0 40px;
  padding: 56px 36px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(0, 85, 165, 0.06) 0%, rgba(2, 132, 199, 0.08) 50%, rgba(196, 151, 92, 0.06) 100%);
  border: 1px solid var(--border-accent);
  text-align: center;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.cta-banner-pavilion h3 {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.cta-banner-pavilion p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 660px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

/* ==========================================================================
   极简页脚 (严格只保留四个标题，在新页面打开展示)
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-light);
  background: var(--bg-card);
  padding: 38px 0;
  transition: var(--transition);
}

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

.footer-link {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-muted);
  position: relative;
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--aegean-blue);
}

/* ==========================================================================
   通用子页面与【推荐资讯】页面样式
   ========================================================================== */
.page-container {
  max-width: 900px;
  margin: 44px auto 90px;
  padding: 0 28px;
}

.page-header {
  margin-bottom: 44px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.page-title {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

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

.article-content {
  color: var(--text-muted);
  line-height: 1.85;
  font-size: 1.02rem;
}

.article-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 36px;
  margin-bottom: 30px;
  box-shadow: var(--shadow-sm);
}

.article-section h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.article-section p {
  margin-bottom: 16px;
}

.article-section p:last-child {
  margin-bottom: 0;
}

.article-list {
  padding-left: 22px;
  margin-bottom: 18px;
  list-style-type: disc;
}

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

/* 资讯卡片流 */
.news-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 32px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.news-meta-row {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.85rem;
  color: var(--text-light);
  flex-wrap: wrap;
}

.news-category-badge {
  padding: 3px 10px;
  background: var(--badge-bg);
  color: var(--aegean-blue);
  border-radius: 6px;
  font-weight: 700;
}

.news-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.4;
}

.news-title a:hover {
  color: var(--aegean-blue);
}

.news-summary {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   深度 SEO 长篇科普文章排版 (Long-form Depth SEO Article Styles)
   ========================================================================== */
.article-wrapper {
  max-width: 920px;
  margin: 36px auto 80px;
  padding: 0 24px;
}

.article-hero {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.article-main-title {
  font-size: 2.3rem;
  line-height: 1.3;
  font-weight: 900;
  color: var(--text-main);
  margin: 16px 0 18px;
  letter-spacing: -0.5px;
}

/* 文章目录 (Table of Contents) */
.article-toc {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--aegean-blue);
  border-radius: 14px;
  padding: 24px 28px;
  margin: 32px 0 40px;
}

.toc-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 4px;
}

.toc-list a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  display: inline-block;
}

.toc-list a:hover {
  color: var(--aegean-blue);
  transform: translateX(4px);
}

/* 正文深度排版 */
.article-body {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.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 ul, .article-body ol {
  margin: 16px 0 24px 24px;
}

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

.article-body blockquote {
  margin: 24px 0;
  padding: 18px 24px;
  background: var(--bg-card);
  border-left: 4px solid var(--aegean-blue);
  border-radius: 0 12px 12px 0;
  font-style: normal;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

.article-data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  background: var(--bg-card);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.article-data-table th, .article-data-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.92rem;
}

.article-data-table th {
  background: var(--bg-subtle);
  font-weight: 800;
  color: var(--text-main);
}

.internal-link {
  color: var(--aegean-blue);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.internal-link:hover {
  color: var(--aegean-sky);
}

/* 文章专属 FAQ 区块 */
.article-faq-section {
  margin: 50px 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 34px;
}

.article-faq-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 22px;
}

/* 相关阅读网格 (Related Readings) */
.related-reads-section {
  margin: 54px 0 20px;
  border-top: 1px solid var(--border-light);
  padding-top: 36px;
}

.related-reads-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.related-read-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 18px 20px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-read-item:hover {
  border-color: var(--aegean-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.related-read-item h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 8px;
}

.related-read-item a {
  color: var(--aegean-blue);
  font-size: 0.85rem;
  font-weight: 700;
}

@media (max-width: 768px) {
  .related-reads-grid {
    grid-template-columns: 1fr;
  }
  .article-main-title {
    font-size: 1.85rem;
  }
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.sitemap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px;
}

.sitemap-card h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

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

.sitemap-links a {
  color: var(--aegean-blue);
  font-weight: 600;
}

.sitemap-links a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   响应式媒体查询 (@media - 手机端单栏完美适配)
   ========================================================================== */
@media (max-width: 1024px) {
  .nav-menu {
    gap: 14px;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
  .pricing-board.featured-plan {
    transform: none;
  }
  .pricing-board.featured-plan:hover {
    transform: translateY(-8px);
  }
  .showcase-grid {
    grid-template-columns: 1fr;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
    max-width: 540px;
    margin: 0 auto;
  }
  .hero-stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .stat-box:nth-child(2)::after {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none; /* 移动端收起长菜单 */
  }
  .hero-section {
    padding: 60px 0 45px;
  }
  .hero-headline {
    font-size: 2.25rem;
    letter-spacing: -0.6px;
  }
  .hero-subtitle {
    font-size: 1.15rem;
  }
  .hero-intro-desc {
    font-size: 0.98rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 14px;
  }
  .hero-actions .btn {
    width: 100%;
    padding: 15px 22px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .showcase-card {
    padding: 28px 22px;
  }
  .pricing-board {
    padding: 32px 24px;
  }
  .footer-nav {
    flex-direction: column;
    gap: 20px;
    text-align: center;
  }
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 18px;
  }
  .hero-stats-bar {
    grid-template-columns: 1fr 1fr;
    padding: 20px 16px;
    gap: 16px;
  }
  .stat-val {
    font-size: 1.6rem;
  }
}