/* ==========================================================================
   FlowerCloud (花云) - Stratospheric Floral-Mist UI Design System
   设计语言：纯净无边界平流层花雾体系 (Weightless Aerogel Architecture)
   色彩：卷云天白 (#f9fbfd)、细腻微雾花瓣粉润 (Petal-Aerosol Tint)、冰川深青黑 (#0f172a)
   交互：空气动力学微雾交互 (Aerodynamic Slipstream & Aerogel Glow)
   严格规范：零劣质 AI 闪光/机器人，纯粹现代科技极简与诗意速度
   ========================================================================== */

/* ---------------- 核心设计变量 ---------------- */
:root {
  /* 卷云天白与花雾渐变系统 - 默认白天模式 (Light Mode) */
  --bg-sky: #f9fbfd;
  --bg-body: #f9fbfd;
  --bg-surface: rgba(255, 255, 255, 0.72);
  --bg-aerogel: rgba(255, 255, 255, 0.65);
  --bg-aerogel-hover: rgba(255, 255, 255, 0.92);
  --bg-subtle: rgba(244, 63, 94, 0.035);
  --bg-nav: rgba(249, 251, 253, 0.82);

  /* 冰川深青排版色彩 (Glacier-Navy Typography) */
  --text-main: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-mono: #475569;

  /* 花雾与平流层高光 (Petal Aerosol Accents) */
  --petal-pink: #f43f5e;
  --petal-blush: rgba(244, 63, 94, 0.08);
  --petal-glow: rgba(244, 63, 94, 0.16);
  --stratosphere-violet: #6366f1;
  --glacier-cyan: #0284c7;
  --emerald-pure: #10b981;

  /* 无边界气凝胶阴影与内部微光 */
  --aerogel-shadow: 0 20px 40px -15px rgba(15, 23, 42, 0.05), 0 0 1px 1px rgba(255, 255, 255, 0.85);
  --aerogel-hover-shadow: 0 30px 60px -15px rgba(244, 63, 94, 0.14), 0 0 0 1px rgba(244, 63, 94, 0.18);
  --aerogel-internal-glow: radial-gradient(circle at 50% 0%, rgba(244, 63, 94, 0.08), transparent 70%);

  --border-aerogel: rgba(226, 232, 240, 0.65);
  --border-subtle: rgba(244, 63, 94, 0.12);

  /* 平流层渐变 */
  --gradient-title: linear-gradient(135deg, #0f172a 0%, #1e293b 45%, #e11d48 100%);
  --gradient-petal: linear-gradient(135deg, #f43f5e 0%, #fb7185 50%, #6366f1 100%);
  --gradient-badge: linear-gradient(135deg, rgba(244, 63, 94, 0.08) 0%, rgba(99, 102, 241, 0.06) 100%);

  /* 布局与圆角 */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  --max-width: 1240px;
  --header-height: 74px;

  /* 动画过渡 */
  --ease-aerodynamic: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s var(--ease-aerodynamic);
  --transition-fast: 0.2s ease;
  --transition-theme: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

/* ---------------- 夜间模式 (Nocturnal Stratospheric Floral-Mist) ---------------- */
html.dark {
  --bg-sky: #060913;
  --bg-body: #060913;
  --bg-surface: rgba(13, 19, 34, 0.72);
  --bg-aerogel: rgba(18, 26, 46, 0.62);
  --bg-aerogel-hover: rgba(24, 34, 58, 0.9);
  --bg-subtle: rgba(244, 63, 94, 0.06);
  --bg-nav: rgba(6, 9, 19, 0.84);

  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-mono: #94a3b8;

  --petal-pink: #fb7185;
  --petal-blush: rgba(251, 113, 133, 0.12);
  --petal-glow: rgba(251, 113, 133, 0.25);
  --stratosphere-violet: #818cf8;
  --glacier-cyan: #38bdf8;
  --emerald-pure: #34d399;

  --aerogel-shadow: 0 20px 45px -15px rgba(0, 0, 0, 0.65), 0 0 1px 1px rgba(255, 255, 255, 0.05);
  --aerogel-hover-shadow: 0 30px 65px -15px rgba(244, 63, 94, 0.22), 0 0 0 1px rgba(251, 113, 133, 0.3);
  --aerogel-internal-glow: radial-gradient(circle at 50% 0%, rgba(244, 63, 94, 0.14), transparent 75%);

  --border-aerogel: rgba(30, 41, 68, 0.65);
  --border-subtle: rgba(251, 113, 133, 0.16);

  --gradient-title: linear-gradient(135deg, #ffffff 0%, #e2e8f0 50%, #fda4af 100%);
  --gradient-petal: linear-gradient(135deg, #fb7185 0%, #f43f5e 50%, #818cf8 100%);
  --gradient-badge: linear-gradient(135deg, rgba(251, 113, 133, 0.15) 0%, rgba(129, 140, 248, 0.1) 100%);
}

/* ---------------- 全局重置与平滑滚动 ---------------- */
*, *::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;
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* 背景平流层花雾微粒 Canvas 画布 (受光标气流排开交互) */
#slipstream-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
}

/* 柔和云阶梯光晕背景 */
.cloud-terrace-backdrop {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1400px;
  height: 900px;
  background: radial-gradient(circle at 50% 15%, rgba(244, 63, 94, 0.05), rgba(99, 102, 241, 0.03) 45%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

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

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

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

/* ---------------- 统一容器 ---------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
  position: relative;
  z-index: 1;
}

.section {
  padding: 108px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-subtle);
  border-top: 1px solid var(--border-aerogel);
  border-bottom: 1px solid var(--border-aerogel);
  transition: var(--transition-theme);
}

/* 区域头部标题规范 */
.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 64px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border-radius: var(--radius-full);
  background: var(--gradient-badge);
  border: 1px solid var(--border-subtle);
  color: var(--petal-pink);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 20px;
  backdrop-filter: blur(8px);
}

.section-title {
  font-size: 2.45rem;
  font-weight: 800;
  line-height: 1.24;
  color: var(--text-main);
  margin-bottom: 18px;
  letter-spacing: -0.025em;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

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

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

/* ---------------- 导航栏 (Header / Navbar) ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--bg-nav);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-aerogel);
  transition: var(--transition-theme);
}

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

.brand-logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  line-height: 1;
}

.brand-logo-img {
  height: 40px;
  width: auto;
  max-width: 215px;
  object-fit: contain;
  display: block;
  transition: transform var(--transition-fast);
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.02);
}

.logo-dark {
  display: none !important;
}

.logo-light {
  display: block !important;
}

html.dark .logo-light {
  display: none !important;
}

html.dark .logo-dark {
  display: block !important;
}

/* 导航链接目录 (含首页及每个板块) */
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 6px;
  position: relative;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--petal-pink);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--petal-pink);
  transition: width var(--transition-fast);
  border-radius: var(--radius-full);
}

.nav-link:hover::after {
  width: 80%;
}

/* 专属‘推荐资讯’导航徽章式高亮 */
.nav-link-news {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--petal-blush);
  color: var(--petal-pink) !important;
  border: 1px solid var(--border-subtle);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.nav-link-news:hover {
  background: rgba(244, 63, 94, 0.16);
  transform: translateY(-1px);
}

.nav-link-news::after {
  display: none !important;
}

.nav-link-news .pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--petal-pink);
  animation: pulseNews 2s infinite;
}

@keyframes pulseNews {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

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

/* ---------------- 昼夜模式切换按钮 (精致、透明、专业化) ---------------- */
.theme-toggle-btn {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  color: var(--text-secondary);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.theme-toggle-btn:hover {
  background-color: var(--bg-aerogel-hover);
  color: var(--petal-pink);
  border-color: var(--petal-pink);
  transform: rotate(15deg) scale(1.05);
}

.theme-toggle-btn svg {
  width: 19px;
  height: 19px;
  stroke-width: 2;
  transition: transform 0.4s var(--ease-aerodynamic), opacity 0.3s ease;
}

.sun-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.moon-icon {
  position: absolute;
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

html.dark .sun-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

html.dark .moon-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
  color: #fbbf24;
}

.menu-toggle-btn {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-aerogel);
  color: var(--text-main);
  background: var(--bg-aerogel);
}

/* ---------------- 按钮体系 (CTA 规范严格) ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
  line-height: 1;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-petal);
  color: #ffffff !important;
  box-shadow: 0 4px 18px rgba(244, 63, 94, 0.32);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(244, 63, 94, 0.45);
  filter: brightness(1.05);
}

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

.btn-secondary:hover {
  background: var(--bg-aerogel-hover);
  border-color: var(--petal-pink);
  color: var(--petal-pink);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.86rem;
}

.btn-block {
  width: 100%;
}

/* ---------------- 主视觉区 (Hero Section - 平流层云阶梯) ---------------- */
.hero-section {
  padding: 88px 0 112px 0;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 920px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 22px;
  border-radius: var(--radius-full);
  background: var(--gradient-badge);
  border: 1px solid var(--border-subtle);
  color: var(--petal-pink);
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 28px;
  backdrop-filter: blur(16px);
  box-shadow: var(--aerogel-shadow);
}

.hero-headline {
  font-size: 3.65rem;
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
  color: var(--text-main);
}

.hero-brand-highlight {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--petal-pink);
  margin-bottom: 12px;
}

.hero-subhead {
  font-size: 1.25rem;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto 38px auto;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

/* 核心指标微胶囊 */
.hero-telemetry-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 32px;
  border-radius: var(--radius-lg);
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  backdrop-filter: blur(16px);
  box-shadow: var(--aerogel-shadow);
}

.telemetry-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.telemetry-val {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

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

/* ---------------- 气凝胶卡片通用 (Borderless Aerogel Tiles) ---------------- */
.aerogel-card {
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  border-radius: var(--radius-xl);
  padding: 38px 32px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: var(--aerogel-shadow);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.aerogel-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--aerogel-internal-glow);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.aerogel-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--aerogel-hover-shadow);
  border-color: var(--border-subtle);
}

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

/* ---------------- 产品核心优势 (3个图文卡片) ---------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-icon-bubble {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-md);
  background: var(--gradient-badge);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--petal-pink);
  margin-bottom: 24px;
}

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

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

.feature-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.72;
}

.feature-specs-list {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--border-aerogel);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-spec-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.feature-spec-item svg {
  width: 16px;
  height: 16px;
  color: var(--emerald-pure);
  flex-shrink: 0;
}

/* ---------------- 专线路由气凝胶交互展示 (Regional Routes) ---------------- */
.routes-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  margin-top: 40px;
}

.route-aerogel-tile {
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  backdrop-filter: blur(16px);
  box-shadow: var(--aerogel-shadow);
  transition: all var(--transition-normal);
  cursor: default;
  position: relative;
  overflow: hidden;
}

.route-aerogel-tile::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-petal);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.route-aerogel-tile:hover {
  transform: translateY(-6px);
  border-color: var(--petal-pink);
  box-shadow: 0 20px 35px -10px rgba(244, 63, 94, 0.22);
  background: var(--bg-aerogel-hover);
}

.route-aerogel-tile:hover::after {
  opacity: 1;
}

.route-flag-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.route-code {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: 0.05em;
}

.route-latency-badge {
  font-size: 0.76rem;
  font-weight: 700;
  font-family: monospace;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.12);
  color: var(--emerald-pure);
}

.route-name {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.route-protocol-line {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: monospace;
}

/* ---------------- 流媒体图卡展示 (Streaming Media Section) ---------------- */
.media-layout {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 48px;
  align-items: center;
}

.platform-grid-aerogel {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.platform-tile {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.platform-tile:hover {
  transform: translateY(-2px);
  border-color: var(--petal-pink);
  background: var(--bg-aerogel-hover);
}

.platform-logo-box {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.05rem;
  flex-shrink: 0;
}

.bg-netflix { background-color: #E50914; }
.bg-disney { background-color: #113CCF; }
.bg-youtube { background-color: #FF0000; }
.bg-hbo { background-color: #5822B4; }
.bg-hulu { background-color: #1CE783; color: #060913 !important; }
.bg-spotify { background-color: #1DB954; }

.platform-tile-meta h3,
.platform-tile-meta h4 {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0;
}

.platform-tile-meta span {
  font-size: 0.78rem;
  color: var(--emerald-pure);
  font-weight: 600;
}

/* ---------------- AI 支持图卡 (严谨科技感，零低劣 AI 闪烁与假头像) ---------------- */
.ai-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 36px;
}

.ai-aerogel-card {
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--aerogel-shadow);
  backdrop-filter: blur(16px);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.ai-aerogel-card:hover {
  transform: translateY(-5px);
  border-color: var(--petal-pink);
  box-shadow: var(--aerogel-hover-shadow);
}

.ai-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.ai-brand-badge {
  font-size: 0.85rem;
  font-weight: 700;
  font-family: monospace;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--petal-blush);
  color: var(--petal-pink);
}

.ai-status-pulse {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--emerald-pure);
  font-family: monospace;
}

.ai-status-pulse::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--emerald-pure);
  box-shadow: 0 0 8px var(--emerald-pure);
}

.ai-tool-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.ai-tool-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.ai-param-table {
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 0.78rem;
  font-family: monospace;
  color: var(--text-mono);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* ---------------- 套餐价格对比表 (参考真实花云套餐) ---------------- */
.pricing-cards-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-aerogel-card {
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  border-radius: var(--radius-xl);
  padding: 34px 26px;
  box-shadow: var(--aerogel-shadow);
  backdrop-filter: blur(18px);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-aerogel-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--aerogel-hover-shadow);
}

.pricing-aerogel-card.featured {
  border: 2px solid var(--petal-pink);
  box-shadow: 0 25px 50px -15px rgba(244, 63, 94, 0.25);
  background: var(--bg-aerogel-hover);
  transform: scale(1.03);
}

.pricing-aerogel-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.featured-pill {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-petal);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(244, 63, 94, 0.4);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.tier-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.tier-tagline {
  font-size: 0.85rem;
  color: var(--text-secondary);
  min-height: 38px;
  margin-bottom: 20px;
}

.tier-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 22px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-aerogel);
}

.tier-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
}

.tier-amount {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  letter-spacing: -0.03em;
}

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

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

.tier-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.tier-feature-item svg {
  width: 17px;
  height: 17px;
  color: var(--emerald-pure);
  flex-shrink: 0;
}

.tier-feature-item.dimmed {
  color: var(--text-muted);
  text-decoration: line-through;
}

.tier-feature-item.dimmed svg {
  color: var(--text-muted);
}

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

.review-aerogel-tile {
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--aerogel-shadow);
  backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.review-aerogel-tile:hover {
  transform: translateY(-4px);
  border-color: var(--border-subtle);
  box-shadow: var(--aerogel-hover-shadow);
}

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

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

.review-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.72;
  margin-bottom: 22px;
  flex-grow: 1;
}

.reviewer-author-box {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 18px;
  border-top: 1px solid var(--border-aerogel);
}

.reviewer-avatar-pill {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--gradient-badge);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--petal-pink);
  font-size: 0.95rem;
}

.reviewer-author-info h3,
.reviewer-author-info h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0;
}

.reviewer-author-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

.faq-aerogel-item {
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(14px);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-aerogel-item:hover {
  border-color: var(--petal-pink);
  box-shadow: var(--aerogel-shadow);
}

.faq-question-btn {
  width: 100%;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  background: none;
  cursor: pointer;
}

.faq-chevron {
  width: 22px;
  height: 22px;
  color: var(--petal-pink);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-aerogel-item.active .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer-pane {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--ease-aerodynamic), padding 0.3s ease;
  background-color: var(--bg-subtle);
}

.faq-aerogel-item.active .faq-answer-pane {
  max-height: 350px;
  padding: 18px 26px 24px 26px;
  border-top: 1px solid var(--border-aerogel);
}

.faq-answer-pane p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ---------------- 底部呼吁横幅 (Bottom CTA) ---------------- */
.bottom-cta-aerogel {
  background: var(--gradient-petal);
  border-radius: var(--radius-xl);
  padding: 68px 36px;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 25px 50px -15px rgba(244, 63, 94, 0.35);
  margin-bottom: 24px;
}

.bottom-cta-aerogel h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.025em;
}

.bottom-cta-aerogel p {
  font-size: 1.12rem;
  opacity: 0.94;
  max-width: 650px;
  margin: 0 auto 34px auto;
}

.bottom-cta-aerogel .btn {
  background: #ffffff;
  color: var(--text-main) !important;
  font-weight: 700;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.bottom-cta-aerogel .btn:hover {
  transform: translateY(-3px) scale(1.02);
}

/* ---------------- 页脚 (严格规范：只保留四个标题，在新页面打开) ---------------- */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-aerogel);
  padding: 50px 0 38px 0;
  margin-top: auto;
  transition: var(--transition-theme);
  position: relative;
  z-index: 10;
}

.footer-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 26px;
  text-align: center;
}

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

.footer-link {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.footer-link:hover {
  color: var(--petal-pink);
  background-color: var(--petal-blush);
}

.footer-bottom {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--border-aerogel);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-copyright {
  font-size: 0.86rem;
  color: var(--text-muted);
}

.footer-domain {
  font-size: 0.86rem;
  color: var(--text-muted);
  font-family: monospace;
}

/* ---------------- 资讯文章卡片 (用于推荐资讯页面) ---------------- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 36px;
}

.article-card {
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--aerogel-shadow);
  backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--petal-pink);
  box-shadow: var(--aerogel-hover-shadow);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.article-category {
  font-size: 0.76rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--petal-blush);
  color: var(--petal-pink);
}

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

.article-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 12px;
}

.article-summary {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: 20px;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-aerogel);
  font-size: 0.88rem;
  color: var(--petal-pink);
  font-weight: 600;
}

/* ---------------- 移动端响应式适配 (@media queries) ---------------- */
@media (max-width: 1100px) {
  .hero-headline {
    font-size: 2.85rem;
  }
  .pricing-cards-container {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-aerogel-card.featured {
    transform: none;
  }
  .pricing-aerogel-card.featured:hover {
    transform: translateY(-6px);
  }
  .routes-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .ai-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 66px;
  }

  .section {
    padding: 68px 0;
  }

  .hero-section {
    padding: 48px 0 68px 0;
  }

  .hero-headline {
    font-size: 2.15rem;
  }

  .hero-brand-highlight {
    font-size: 1.25rem;
  }

  .hero-subhead {
    font-size: 1.05rem;
  }

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

  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px; /* 适合手指触摸 */
  }

  .hero-telemetry-bar {
    grid-template-columns: repeat(2, 1fr);
    padding: 20px;
    gap: 16px;
  }

  .menu-toggle-btn {
    display: inline-flex;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border-aerogel);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    gap: 14px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    width: 100%;
    padding: 10px 0;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--border-aerogel);
  }

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

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

  .media-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .platform-grid-aerogel {
    grid-template-columns: 1fr;
  }

  .ai-cards-grid {
    grid-template-columns: 1fr;
  }

  .pricing-cards-container {
    grid-template-columns: 1fr;
    max-width: 460px;
    margin: 0 auto;
  }

  .reviews-aerogel-grid {
    grid-template-columns: 1fr;
  }

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

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 10px;
  }
}

/* ---------------- 深度科普 SEO 文章专属排版 (Article Reading Prose) ---------------- */
.article-reading-container {
  max-width: 880px;
  margin: 0 auto;
  padding: 40px 0 80px 0;
}

.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.article-breadcrumb a:hover {
  color: var(--petal-pink);
}

.article-header-hero {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-aerogel);
}

.article-header-hero h1 {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.32;
  letter-spacing: -0.025em;
  margin: 16px 0;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.86rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-lead {
  font-size: 1.1rem;
  line-height: 1.78;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  border-left: 4px solid var(--petal-pink);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  margin: 24px 0 36px 0;
}

/* 目录 (Table of Contents) 容器 */
.article-toc-box {
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  border-radius: var(--radius-lg);
  padding: 26px 30px;
  margin: 32px 0 44px 0;
  box-shadow: var(--aerogel-shadow);
  backdrop-filter: blur(16px);
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-aerogel);
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
  padding-left: 0;
}

.toc-list li a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.94rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.toc-list li a:hover {
  color: var(--petal-pink);
  transform: translateX(4px);
}

/* 深度科普正文 Prose 排版 */
.article-body-prose {
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.82;
}

.article-body-prose h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 48px 0 20px 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-aerogel);
  letter-spacing: -0.02em;
  scroll-margin-top: calc(var(--header-height) + 30px);
}

.article-body-prose h3 {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 32px 0 14px 0;
  scroll-margin-top: calc(var(--header-height) + 30px);
}

.article-body-prose p {
  margin-bottom: 20px;
}

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

.article-body-prose ul, .article-body-prose ol {
  margin: 16px 0 24px 28px;
}

.article-body-prose li {
  margin-bottom: 10px;
  line-height: 1.75;
}

.article-body-prose code {
  background: var(--bg-subtle);
  color: var(--petal-pink);
  font-family: monospace;
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.9em;
  border: 1px solid var(--border-subtle);
}

.article-callout {
  background: var(--bg-aerogel);
  border: 1px solid var(--border-aerogel);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 28px 0;
  box-shadow: var(--aerogel-shadow);
}

.article-callout.highlight {
  border-left: 4px solid var(--petal-pink);
  background: var(--bg-subtle);
}

.article-callout.tip {
  border-left: 4px solid var(--emerald-pure);
  background: rgba(16, 185, 129, 0.04);
}

.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
}

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

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

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

/* 展开手风琴 FAQ 样式 */
.article-faq-section {
  margin: 56px 0 40px 0;
  padding-top: 36px;
  border-top: 2px dashed var(--border-aerogel);
}

.article-faq-section h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 24px;
}

/* 相关阅读网格 */
.related-reading-section {
  margin: 56px 0 20px 0;
  padding-top: 36px;
  border-top: 1px solid var(--border-aerogel);
}

.related-reading-section h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 22px;
}

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

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

.related-card:hover {
  transform: translateY(-3px);
  border-color: var(--petal-pink);
  box-shadow: var(--aerogel-hover-shadow);
}

.related-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 8px;
}

.related-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}

@media (max-width: 768px) {
  .related-links-grid {
    grid-template-columns: 1fr;
  }
  .article-header-hero h1 {
    font-size: 1.8rem;
  }
}