/* ==========================================================================
   银河云 (Galaxy Cloud) - 天文台高调极简设计规范样式表
   Design Language: High-Key Celestial Observatory UI
   - Alpine snow-white base (#fafbfc), frosted mirror silver (#e2e8f0),
     cryogenic starlight blue accents (#38bdf8 / #0284c7)
   - Concentric polar star-trail arcs & equatorial telescope rotational inertia
   - Dynamic chrome specular gleam along 1px silver borders
   - Needle-sharp cursor proximity latency focus
   - Strictly devoid of generic AI badges; monastic precision
   ========================================================================== */

:root {
  /* 高调天文台白天模式 (Pure Astronomical Daylight) */
  --bg-main: #fafbfc;
  --bg-surface: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(250, 251, 252, 0.85);
  --border-color: #e2e8f0;             /* 磨砂镜面银 */
  --border-hover: #cbd5e1;
  --border-glass: rgba(226, 232, 240, 0.85);

  --text-main: #0b1329;                /* 深邃星空藏青 */
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverted: #fafbfc;

  /* 低温极光与深空星芒色调 (Cryogenic Starlight Blue) */
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: rgba(56, 189, 248, 0.1);
  --starlight: #38bdf8;
  --starlight-glow: rgba(56, 189, 248, 0.3);
  --silver-gleam: #f1f5f9;

  --gradient-celestial: linear-gradient(135deg, #0369a1 0%, #0284c7 45%, #38bdf8 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 250, 252, 0.9) 100%);
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.08), transparent 70%);

  /* 状态色 */
  --success: #10b981;
  --success-bg: #ecfdf5;
  --warning: #f59e0b;
  --danger: #ef4444;

  /* 极简严谨阴影与倒角 */
  --shadow-sm: 0 1px 3px rgba(11, 19, 41, 0.04);
  --shadow-md: 0 4px 16px -2px rgba(11, 19, 41, 0.06);
  --shadow-lg: 0 16px 36px -6px rgba(11, 19, 41, 0.08);
  --shadow-gleam: 0 0 28px -4px rgba(56, 189, 248, 0.22);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --max-width: 1240px;
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 深空天文观测夜间模式 (Deep Space Observatory Night) */
[data-theme="dark"] {
  --bg-main: #060911;
  --bg-surface: #0a0f1d;
  --bg-card: rgba(12, 18, 34, 0.82);
  --bg-card-hover: rgba(16, 24, 46, 0.92);
  --bg-glass: rgba(8, 12, 24, 0.88);
  --border-color: #1e293b;
  --border-hover: #334155;
  --border-glass: rgba(255, 255, 255, 0.07);

  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverted: #060911;

  --primary: #38bdf8;
  --primary-hover: #7dd3fc;
  --primary-light: rgba(56, 189, 248, 0.15);
  --starlight: #38bdf8;
  --starlight-glow: rgba(56, 189, 248, 0.4);
  --silver-gleam: #334155;

  --gradient-celestial: linear-gradient(135deg, #38bdf8 0%, #60a5fa 55%, #818cf8 100%);
  --gradient-card: linear-gradient(180deg, rgba(14, 22, 42, 0.85) 0%, rgba(10, 15, 29, 0.9) 100%);
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.14), transparent 70%);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px -2px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 16px 36px -6px rgba(0, 0, 0, 0.75);
  --shadow-gleam: 0 0 32px -4px rgba(56, 189, 248, 0.35);
}

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

html {
  scroll-behavior: smooth;
  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-main);
  color: var(--text-main);
  line-height: 1.68;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

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

img, svg {
  vertical-align: middle;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* ==========================================================================
   背景交互星轨画布 (Star-Trail Canvas & Inertia)
   ========================================================================== */
.celestial-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0.85;
}

/* ==========================================================================
   导航栏 Header & 目录
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background-color: var(--bg-glass);
  border-bottom: 1px solid var(--border-glass);
  transition: var(--transition);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.5px;
}

.site-logo {
  height: 36px;
  width: auto;
  max-width: 165px;
  display: block;
  object-fit: contain;
  transition: transform 0.25s ease;
}

.brand-logo:hover .site-logo {
  transform: scale(1.03);
}

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

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

[data-theme="dark"] .logo-light {
  display: none !important;
}

[data-theme="dark"] .logo-dark {
  display: block !important;
}

.brand-divider {
  width: 1px;
  height: 18px;
  background-color: var(--border-color);
  margin: 0 2px;
}

.brand-name {
  background: var(--gradient-celestial);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -0.3px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 4px;
  transition: color 0.2s ease;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 100%;
  height: 2px;
  background: var(--gradient-celestial);
  transition: transform 0.25s ease;
  border-radius: 2px;
}

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

/* 推荐资讯特殊微高亮标识 */
.nav-badge-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--starlight);
  border-radius: 50%;
  margin-left: 4px;
  vertical-align: super;
  box-shadow: 0 0 6px var(--starlight);
}

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

/* 昼夜模式切换按钮: 质感透明、精致毛玻璃、自然过渡 */
.theme-toggle {
  background: rgba(125, 125, 125, 0.08);
  border: 1px solid var(--border-glass);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: var(--transition);
  outline: none;
}

.theme-toggle:hover {
  background: rgba(125, 125, 125, 0.16);
  color: var(--text-main);
  border-color: var(--border-hover);
  transform: rotate(15deg) scale(1.05);
}

.theme-icon-sun,
.theme-icon-moon {
  width: 19px;
  height: 19px;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.25s ease;
}

[data-theme="light"] .theme-icon-sun,
:root:not([data-theme="dark"]) .theme-icon-sun {
  display: none;
}
[data-theme="light"] .theme-icon-moon,
:root:not([data-theme="dark"]) .theme-icon-moon {
  display: block;
}

[data-theme="dark"] .theme-icon-sun {
  display: block;
  color: #fbbf24;
}
[data-theme="dark"] .theme-icon-moon {
  display: none;
}

/* ==========================================================================
   按钮规范 (CTA Buttons)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  white-space: nowrap;
  min-height: 46px;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-celestial);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(2, 132, 199, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 6px 24px rgba(2, 132, 199, 0.5);
  transform: translateY(-2px);
  color: #ffffff;
}

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

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

.btn-lg {
  padding: 15px 36px;
  font-size: 1.05rem;
  min-height: 52px;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   天文台微交互: 铬合金镜面反光 (Chrome Specular Gleam)
   ========================================================================== */
.observatory-card {
  position: relative;
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  overflow: hidden;
}

.observatory-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), var(--shadow-gleam);
  border-color: var(--border-hover);
}

/* 动态镜面反射光束 */
.card-specular-gleam {
  position: absolute;
  top: 0;
  left: -120%;
  width: 70%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.04) 35%,
    rgba(56, 189, 248, 0.28) 48%,
    rgba(255, 255, 255, 0.7) 50%,
    rgba(56, 189, 248, 0.28) 52%,
    transparent 100%
  );
  transform: skewX(-25deg);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s;
}

.observatory-card:hover .card-specular-gleam {
  opacity: 1;
  animation: chromeGleam 1.4s ease-out forwards;
}

@keyframes chromeGleam {
  0% { left: -120%; }
  100% { left: 220%; }
}

/* ==========================================================================
   精密测绘微交互: 悬停聚焦低延迟读数 (Needle-Sharp Latency Readout)
   ========================================================================== */
.latency-readout {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.06);
  border: 1px solid rgba(56, 189, 248, 0.18);
  color: var(--primary);
  /* 默认微模糊隐形状态 (Hazy & Monastic) */
  filter: blur(3.5px);
  opacity: 0.22;
  transform: scale(0.97);
  transition: filter 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.35s ease;
  user-select: none;
  white-space: nowrap;
}

/* 光标临近或卡片悬停时，瞬间锐利聚焦 (Needle-Sharp Focus) */
.observatory-card:hover .latency-readout,
.latency-readout:hover {
  filter: blur(0px);
  opacity: 1;
  transform: scale(1);
  border-color: var(--starlight);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.25);
  background: rgba(56, 189, 248, 0.12);
}

.latency-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 5px var(--success);
}

/* ==========================================================================
   Hero 主视觉区
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 95px 0 70px;
  background-image: var(--gradient-glow);
  text-align: center;
  overflow: hidden;
}

/* 天文台坐标标尺与极轴微印 */
.hero-coords-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.coords-dot {
  width: 6px;
  height: 6px;
  background-color: var(--starlight);
  border-radius: 50%;
  animation: celestialPulse 2.4s infinite;
}

@keyframes celestialPulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(56, 189, 248, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0); }
}

.hero-title {
  font-size: 3.3rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1.2px;
  margin-bottom: 20px;
  color: var(--text-main);
}

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

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 36px;
  font-weight: 400;
  line-height: 1.72;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 54px;
}

/* 核心观测指标条 */
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
  margin-top: 10px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.metric-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-value {
  font-size: 1.9rem;
  font-weight: 800;
  background: var(--gradient-celestial);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

/* ==========================================================================
   通用的区块标题排版
   ========================================================================== */
.section {
  padding: 90px 0;
  position: relative;
}

.section-alt {
  background-color: rgba(125, 125, 125, 0.02);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--primary);
  margin-bottom: 10px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 14px;
  letter-spacing: -0.8px;
}

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

/* ==========================================================================
   核心优势 (3个图文卡片)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
}

.feature-header-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.observatory-card:hover .feature-icon-wrapper {
  transform: scale(1.08);
  background: var(--gradient-celestial);
  color: #fff;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.feature-text {
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.7;
  margin-bottom: 22px;
}

.feature-points {
  list-style: none;
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-point {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.feature-point svg {
  color: var(--starlight);
  flex-shrink: 0;
}

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

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

.showcase-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.showcase-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  width: fit-content;
}

.showcase-title {
  font-size: 1.7rem;
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}

.showcase-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.68;
  margin-bottom: 26px;
}

.pill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.pill-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

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

.dot-netflix { background: #e50914; }
.dot-disney { background: #113ccf; }
.dot-youtube { background: #ff0000; }
.dot-hbo { background: #5822b4; }
.dot-openai { background: #10a37f; }
.dot-claude { background: #d97706; }
.dot-midjourney { background: #2563eb; }
.dot-gemini { background: #4285f4; }

.showcase-specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.spec-box {
  display: flex;
  flex-direction: column;
}

.spec-title {
  font-size: 0.84rem;
  color: var(--text-muted);
}

.spec-val {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2px;
}

/* ==========================================================================
   套餐价格对比表 (参考网上真实机场/专线套餐行情与周期切换)
   ========================================================================== */
.pricing-billing-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.switch-pill {
  display: inline-flex;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 4px;
  box-shadow: var(--shadow-sm);
}

.switch-btn {
  border: none;
  background: transparent;
  padding: 8px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
}

.switch-btn.active {
  background: var(--gradient-celestial);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(2, 132, 199, 0.3);
}

.discount-tag {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.2);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

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

/* 镜面反光独立裁切层 (确保卡片设置 overflow: visible 时光束不外溢) */
.card-gleam-clip {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: inherit;
  pointer-events: none;
}

.pricing-card {
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: visible; /* 允许顶部热门推荐标签悬浮在边框外部，彻底防止被裁切 */
}

.pricing-card.popular {
  border-color: var(--primary);
  box-shadow: 0 8px 30px rgba(2, 132, 199, 0.15);
  transform: scale(1.03);
}

.pricing-card.popular:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: 0 12px 35px rgba(2, 132, 199, 0.25);
}

.popular-tag {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-celestial);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 5px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.45);
  white-space: nowrap;
  z-index: 10;
  line-height: 1.3;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.plan-header {
  margin-bottom: 22px;
}

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 6px;
}

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

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-color);
}

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

.price-amount {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.price-period {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

.price-hint {
  font-size: 0.82rem;
  color: var(--success);
  margin-top: 4px;
  font-weight: 600;
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.plan-feature-item svg {
  color: var(--starlight);
  flex-shrink: 0;
}

.plan-feature-item.muted {
  color: var(--text-muted);
  text-decoration: line-through;
  opacity: 0.6;
}

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

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

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

.review-stars {
  display: flex;
  gap: 4px;
  color: #fbbf24;
  margin-bottom: 16px;
}

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

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-celestial);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
}

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

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

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

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

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

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

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  user-select: none;
  list-style: none;
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   转化 CTA 横幅区
   ========================================================================== */
.cta-banner-section {
  padding: 60px 0 95px;
}

.cta-banner {
  background: var(--gradient-celestial);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(2, 132, 199, 0.35);
}

.cta-banner-title {
  font-size: 2.4rem;
  font-weight: 900;
  margin-bottom: 16px;
  letter-spacing: -0.6px;
}

.cta-banner-desc {
  font-size: 1.15rem;
  max-width: 680px;
  margin: 0 auto 36px;
  opacity: 0.95;
  line-height: 1.6;
}

.cta-banner .btn {
  background: #ffffff;
  color: var(--primary);
  font-weight: 700;
  font-size: 1.08rem;
  padding: 16px 42px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.cta-banner .btn:hover {
  background: #f8fafc;
  transform: scale(1.04);
  color: var(--primary-hover);
}

/* ==========================================================================
   页脚 Footer (只保留 4 个规范标题并新页面打开)
   ========================================================================== */
.footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 50px 0 35px;
  transition: var(--transition);
  position: relative;
  z-index: 2;
}

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

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

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

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

.footer-divider {
  width: 100%;
  max-width: 480px;
  height: 1px;
  background-color: var(--border-color);
}

.footer-bottom {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ==========================================================================
   独立子页面通用样式 (关于我们、服务条款、隐私政策、网站地图、推荐资讯)
   ========================================================================== */
.page-container {
  max-width: 900px;
  margin: 40px auto 80px;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

.page-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

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

.page-tag {
  color: var(--primary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 8px;
  display: block;
}

.page-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.page-content {
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.8;
}

.page-content h2 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 36px 0 14px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
}

.page-content p {
  margin-bottom: 16px;
}

.page-content ul {
  margin: 12px 0 20px 24px;
}

.page-content li {
  margin-bottom: 8px;
}

.back-home-wrap {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* 资讯文章列表卡片网格 */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}

.article-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.article-tag {
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.article-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
  line-height: 1.4;
}

.article-excerpt {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.68;
}

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

.sitemap-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-card h3 {
  font-size: 1.15rem;
  margin-bottom: 14px;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sitemap-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sitemap-card li a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.sitemap-card li a:hover {
  color: var(--primary);
  padding-left: 4px;
}

/* ==========================================================================
   单篇深度 SEO 文章详细排版 (Long-form In-depth Article Styling)
   ========================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

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

.breadcrumb a:hover {
  color: var(--primary);
}

.breadcrumb-sep {
  opacity: 0.5;
}

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

.article-header-title {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.32;
  color: var(--text-main);
  margin: 14px 0 16px;
  letter-spacing: -0.6px;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

/* 文章目录 (Table of Contents) */
.toc-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 28px 0 36px;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.toc-list li a {
  color: var(--text-secondary);
  font-size: 0.94rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease, transform 0.2s ease;
}

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

/* 正文段落与标题 */
.article-body {
  font-size: 1.04rem;
  line-height: 1.84;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 44px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  scroll-margin-top: 90px;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 28px 0 12px;
  scroll-margin-top: 90px;
}

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

.article-body ul, .article-body ol {
  margin: 12px 0 22px 24px;
}

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

.article-body a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-body a:hover {
  color: var(--primary-hover);
}

/* 强调高亮提示框 */
.callout-box {
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin: 24px 0;
}

.callout-box strong {
  color: var(--primary);
}

/* 数据对比表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 24px 0 32px;
}

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

.styled-table th, .styled-table td {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
}

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

.styled-table tbody tr:hover {
  background: var(--bg-card-hover);
}

/* 文章内部 FAQ 区块 */
.article-faq-section {
  margin: 48px 0 36px;
  padding-top: 28px;
  border-top: 1px solid var(--border-color);
}

.article-faq-section h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 20px;
}

/* 相关阅读网格 (Related Posts) */
.related-posts-section {
  margin: 50px 0 20px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 18px;
}

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

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

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

.related-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.55;
}

/* ==========================================================================
   移动端与响应式适配 (@media Queries)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.6rem;
  }
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.popular {
    transform: none;
  }
  .pricing-card.popular:hover {
    transform: translateY(-6px);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-wrap {
    height: 64px;
  }

  .site-logo {
    height: 30px;
    max-width: 135px;
  }

  @media (max-width: 480px) {
    .brand-divider,
    .brand-name {
      display: none;
    }
  }

  .hero-section {
    padding: 55px 0 45px;
  }

  .hero-title {
    font-size: 2.05rem;
    letter-spacing: -0.6px;
  }

  .hero-subtitle {
    font-size: 1.02rem;
    margin-bottom: 28px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px 14px;
  }

  .metric-value {
    font-size: 1.5rem;
  }

  .section {
    padding: 55px 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .features-grid,
  .showcase-grid,
  .pricing-grid,
  .reviews-grid,
  .sitemap-grid,
  .related-posts-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .showcase-card {
    padding: 26px 20px;
  }

  .pricing-card {
    padding: 30px 22px;
  }

  .cta-banner {
    padding: 40px 20px;
  }

  .cta-banner-title {
    font-size: 1.85rem;
  }

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

  .page-card {
    padding: 30px 20px;
  }

  .page-title {
    font-size: 1.7rem;
  }
}