/* ==========================================================================
   泡泡狗 (paopaogou.click) - 暖调克制·典雅社论风样式表
   Design Language: Inspired by Claude & Airbnb Warm Editorial Interfaces
   No cartoon dogs, no icons, no visual gimmicks.
   Refined Typography & Precision Tabular Micro-Interactions.
   ========================================================================== */

:root {
  /* 白天模式 (默认) - 温暖温润的雪花石膏与白沙色调 */
  --bg-sand: #F7F5F0;             /* 暖调米沙背景 */
  --bg-card: #FFFFFF;             /* 纯象牙白卡片 */
  --bg-subtle: #F0ECE1;           /* 次级浅色背景 / 悬浮色 */
  --bg-nav: rgba(247, 245, 240, 0.88);
  
  --border-hairline: #E6E2D8;     /* 极细温灰分界线 */
  --border-medium: #D8D2C5;       /* 交互边框 */
  --border-active: #D97706;       /* 陶土琥珀选框 */

  --text-primary: #1C1917;        /* 深焙咖啡主字体 */
  --text-secondary: #44403C;      /* 次级正文字体 */
  --text-muted: #78716C;          /* 辅助说明字体 */
  --text-light: #A8A29E;

  --accent-amber: #D97706;        /* 陶土琥珀色 (Terracotta-Amber) */
  --accent-amber-hover: #B45309;
  --accent-amber-subtle: rgba(217, 119, 6, 0.08);

  --accent-green: #16A34A;        /* 森林墨绿色 (Forest Green - 状态与运行率) */
  --accent-green-subtle: rgba(22, 163, 74, 0.1);

  --shadow-warm-sm: 0 1px 3px rgba(28, 25, 23, 0.04), 0 1px 2px rgba(28, 25, 23, 0.02);
  --shadow-warm-md: 0 4px 14px -2px rgba(28, 25, 23, 0.06), 0 2px 6px -1px rgba(28, 25, 23, 0.03);
  --shadow-warm-lg: 0 12px 30px -4px rgba(28, 25, 23, 0.08), 0 4px 12px -2px rgba(28, 25, 23, 0.04);

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --font-serif: "Newsreader", "Source Serif 4", "Noto Serif SC", "Songti SC", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --transition-gentle: 0.24s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 夜间模式 - 暖调深曜石典雅黑 (Warm Obsidian Luxury) */
[data-theme="dark"] {
  --bg-sand: #141210;
  --bg-card: #1F1C19;
  --bg-subtle: #292521;
  --bg-nav: rgba(20, 18, 16, 0.88);

  --border-hairline: #2D2824;
  --border-medium: #3E3832;
  --border-active: #F59E0B;

  --text-primary: #F5F3EE;
  --text-secondary: #D7D2C7;
  --text-muted: #A39E93;
  --text-light: #706B62;

  --accent-amber: #F59E0B;
  --accent-amber-hover: #D97706;
  --accent-amber-subtle: rgba(245, 158, 11, 0.12);

  --accent-green: #22C55E;
  --accent-green-subtle: rgba(34, 197, 94, 0.12);

  --shadow-warm-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-warm-md: 0 6px 18px -2px rgba(0, 0, 0, 0.45);
  --shadow-warm-lg: 0 16px 36px -4px rgba(0, 0, 0, 0.6);
}

/* ==========================================================================
   Base & Resets
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-secondary);
  background-color: var(--bg-sand);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

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

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

.container {
  width: 100%;
  max-width: 1140px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
}

/* ==========================================================================
   Header & Nav - 精致排版导航
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-hairline);
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.brand-logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent-amber);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(217, 119, 6, 0.28);
  flex-shrink: 0;
  transition: transform var(--transition-gentle), box-shadow var(--transition-gentle);
}

.brand-title:hover .brand-logo-icon {
  transform: translateY(-1px) scale(1.05);
  box-shadow: 0 4px 14px rgba(217, 119, 6, 0.38);
}

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

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

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 4px;
  position: relative;
  transition: color var(--transition-gentle);
}

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

.nav-link.highlight {
  color: var(--accent-amber);
  font-weight: 600;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1.5px;
  background: var(--text-primary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-gentle);
}

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

.nav-link.highlight::after {
  background: var(--accent-amber);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 昼夜模式切换按钮 - 精致专业透明质感 */
.theme-toggle-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline);
  background: rgba(255, 255, 255, 0.4);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-gentle);
}

[data-theme="dark"] .theme-toggle-btn {
  background: rgba(41, 37, 33, 0.6);
}

.theme-toggle-btn:hover {
  border-color: var(--border-medium);
  color: var(--text-primary);
  background: var(--bg-card);
}

.theme-toggle-btn svg {
  width: 17px;
  height: 17px;
}

/* 白天只显示月亮，夜晚只显示太阳 */
html:not([data-theme="dark"]) .icon-sun { display: none; }
html:not([data-theme="dark"]) .icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

.mobile-toggle {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-hairline);
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

/* ==========================================================================
   Buttons - 克制优雅的社论风按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition-gentle);
  white-space: nowrap;
  line-height: 1.2;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-sand) !important;
  border: 1px solid var(--text-primary);
}

.btn-primary:hover {
  background: var(--accent-amber);
  border-color: var(--accent-amber);
  color: #FFFFFF !important;
  transform: translateY(-1px);
}

.btn-accent {
  background: var(--accent-amber);
  color: #FFFFFF !important;
  border: 1px solid var(--accent-amber);
}

.btn-accent:hover {
  background: var(--accent-amber-hover);
  border-color: var(--accent-amber-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
  background: var(--bg-subtle);
  border-color: var(--text-primary);
}

.btn-sm {
  padding: 7px 15px;
  font-size: 0.86rem;
}

.btn-lg {
  padding: 13px 28px;
  font-size: 1.02rem;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Hero Section - 左对齐社论式极简留白
   ========================================================================== */
.hero-editorial {
  padding: 88px 0 64px;
}

.hero-meta-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-amber);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-sans);
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 24px;
  max-width: 900px;
}

.hero-intro {
  font-size: 1.25rem;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 740px;
  margin-bottom: 36px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

/* ==========================================================================
   Interactive Guardian Uptime Tracker (90天全天候守护可用率追踪器)
   ========================================================================== */
.uptime-guardian-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  box-shadow: var(--shadow-warm-sm);
  transition: border-color var(--transition-gentle), box-shadow var(--transition-gentle);
}

.uptime-guardian-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-warm-md);
}

.uptime-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 12px;
}

.uptime-status-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.live-indicator {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--accent-green);
  box-shadow: 0 0 0 0 rgba(22, 163, 74, 0.6);
  animation: pulse-ring 2.4s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(22, 163, 74, 0.6); }
  70% { transform: scale(1); box-shadow: 0 0 0 7px rgba(22, 163, 74, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(22, 163, 74, 0); }
}

.uptime-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.uptime-metric-pill {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-green);
  background: var(--accent-green-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 90天横向分段精密图 */
.uptime-bar-container {
  position: relative;
  width: 100%;
  padding-top: 10px;
  padding-bottom: 6px;
}

.uptime-bars-strip {
  display: flex;
  align-items: flex-end;
  gap: 2.5px;
  height: 42px;
  width: 100%;
}

.uptime-segment {
  flex: 1;
  height: 34px;
  background-color: var(--accent-green);
  border-radius: 2px;
  transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.18s ease;
  cursor: pointer;
  position: relative;
}

.uptime-segment.maintenance {
  background-color: var(--accent-amber);
}

/* 悬停平滑抬升 4px */
.uptime-segment:hover {
  transform: translateY(-4px);
  filter: brightness(1.15);
}

/* 悬浮读数浮窗 */
.uptime-readout {
  margin-top: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-hairline);
  padding-top: 12px;
}

.uptime-live-readout {
  color: var(--text-primary);
  font-weight: 600;
  background: var(--bg-subtle);
  padding: 3px 10px;
  border-radius: var(--radius-xs);
}

/* ==========================================================================
   Section Layouts & Headers
   ========================================================================== */
.section-editorial {
  padding: 72px 0;
  border-top: 1px solid var(--border-hairline);
}

.section-editorial-header {
  margin-bottom: 44px;
  max-width: 720px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-amber);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
  display: block;
}

.section-heading {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

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

/* ==========================================================================
   3 Core Advantages (Clean Tabular Cards)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 32px 26px;
  box-shadow: var(--shadow-warm-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-gentle);
}

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

.advantage-index {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-amber);
  margin-bottom: 18px;
}

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

.advantage-body {
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--text-secondary);
  flex-grow: 1;
  margin-bottom: 20px;
}

.advantage-meta-list {
  list-style: none;
  border-top: 1px solid var(--border-hairline);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.advantage-meta-item {
  font-size: 0.86rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.advantage-meta-item strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ==========================================================================
   Smooth Accordion Spec Sheet (精工技术规格对齐表)
   ========================================================================== */
.spec-sheet-container {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-warm-sm);
  overflow: hidden;
}

.spec-row {
  border-bottom: 1px solid var(--border-hairline);
  transition: background-color var(--transition-gentle);
}

.spec-row:last-child {
  border-bottom: none;
}

.spec-row-trigger {
  width: 100%;
  padding: 22px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  background: none;
  cursor: pointer;
  transition: background-color var(--transition-gentle);
}

.spec-row-trigger:hover {
  background-color: var(--bg-subtle);
}

.spec-row-info {
  display: flex;
  align-items: baseline;
  gap: 20px;
  flex: 1;
}

.spec-feature-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  min-width: 160px;
}

.spec-feature-summary {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.spec-toggle-state {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.spec-chevron {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-gentle);
}

.spec-row.is-open .spec-chevron {
  transform: rotate(180deg);
}

/* 抽屉式侧边实测对比柱状图 */
.spec-drawer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
  background: var(--bg-sand);
  padding: 0 28px;
}

.spec-row.is-open .spec-drawer {
  max-height: 380px;
  padding: 24px 28px 28px;
  border-top: 1px dashed var(--border-hairline);
}

.chart-comparison-box {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.comparison-bar-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.comparison-label-group {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.comparison-track {
  height: 20px;
  background: var(--border-hairline);
  border-radius: var(--radius-xs);
  overflow: hidden;
  display: flex;
}

.comparison-fill-bubble {
  height: 100%;
  background: var(--accent-green);
  border-radius: var(--radius-xs);
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.comparison-fill-normal {
  height: 100%;
  background: var(--text-light);
  border-radius: var(--radius-xs);
  transition: width 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   Streaming & AI Dual Cards Showcase
   ========================================================================== */
.dual-editorial-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.editorial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 36px 30px;
  box-shadow: var(--shadow-warm-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-gentle);
}

.editorial-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-warm-md);
}

.editorial-card-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-amber);
  margin-bottom: 14px;
  text-transform: uppercase;
}

.editorial-card-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.editorial-card-desc {
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.editorial-table-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

.editorial-chip {
  background: var(--bg-sand);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 8px 12px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
}

.editorial-card-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-hairline);
  padding-top: 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Tactile Plan Cards with Odometer Roll (触感套餐卡片与真实价格)
   ========================================================================== */
.pricing-billing-switch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
}

.switch-pill-container {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-full);
  padding: 3px;
  display: inline-flex;
}

.switch-pill-btn {
  padding: 6px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  color: var(--text-muted);
  transition: all var(--transition-gentle);
}

.switch-pill-btn.is-active {
  background: var(--text-primary);
  color: var(--bg-sand);
}

.save-badge {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--accent-amber);
  background: var(--accent-amber-subtle);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.tactile-pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tactile-plan-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  cursor: pointer;
  box-shadow: var(--shadow-warm-sm);
  transition: border 0.28s cubic-bezier(0.16, 1, 0.3, 1), transform 0.28s ease, box-shadow 0.28s ease;
}

.tactile-plan-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-warm-md);
}

/* 选中计划时边框平滑过渡为 2px 陶土琥珀色 */
.tactile-plan-card.is-selected {
  border: 2px solid var(--border-active);
  box-shadow: var(--shadow-warm-lg);
}

.plan-featured-tag {
  position: absolute;
  top: -12px;
  left: 24px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--accent-amber);
  color: #FFFFFF;
  padding: 2px 10px;
  border-radius: var(--radius-xs);
}

.plan-header {
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 22px;
  margin-bottom: 22px;
}

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

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 42px;
}

/* 价格与数字滚轮 (Odometer roll) */
.plan-price-wrapper {
  margin: 16px 0 6px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.plan-price-odometer {
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1;
  display: inline-block;
  min-width: 70px;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
}

.plan-period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
}

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

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

/* ==========================================================================
   User Reviews & Testimonials
   ========================================================================== */
.reviews-editorial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.editorial-review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-warm-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-gentle);
}

.editorial-review-card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-warm-md);
}

.review-metric-rating {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-amber);
  margin-bottom: 14px;
}

.review-quote-text {
  font-family: var(--font-sans);
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 20px;
  flex-grow: 1;
}

.review-author-box {
  border-top: 1px solid var(--border-hairline);
  padding-top: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.author-name-role h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-editorial-wrapper {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

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

.faq-trigger {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
  background: none;
  cursor: pointer;
  text-align: left;
}

.faq-icon-arrow {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  transition: transform var(--transition-gentle);
  flex-shrink: 0;
}

.faq-row.active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--accent-amber);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.25s ease;
  padding: 0 24px;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.faq-row.active .faq-content {
  max-height: 300px;
  padding: 0 24px 22px;
}

/* ==========================================================================
   Footer - 严格四标题规范
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background: var(--bg-card);
  border-top: 1px solid var(--border-hairline);
  padding: 44px 0 32px;
}

.footer-nav-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-xs);
  transition: all var(--transition-gentle);
}

.footer-nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-subtle);
}

.footer-divider {
  width: 100%;
  max-width: 420px;
  height: 1px;
  background: var(--border-hairline);
  margin: 0 auto 20px;
}

.footer-bottom {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Editorial Subpages (About, Terms, Privacy, Sitemap, Insights)
   ========================================================================== */
.article-header {
  padding: 60px 0 36px;
  text-align: left;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 40px;
}

.article-title {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.article-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
}

.article-body-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 44px 40px;
  box-shadow: var(--shadow-warm-sm);
  margin-bottom: 60px;
}

.article-body-card h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 36px;
  margin-bottom: 16px;
}

.article-body-card h2:first-of-type {
  margin-top: 0;
}

.article-body-card p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.article-body-card ul, .article-body-card ol {
  padding-left: 24px;
  margin-bottom: 20px;
}

.article-body-card li {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.callout-box {
  background: var(--bg-sand);
  border-left: 3px solid var(--accent-amber);
  padding: 16px 20px;
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  margin: 20px 0;
}

.callout-box.green {
  border-left-color: var(--accent-green);
}

/* 资讯列表专用排版 */
.insights-feed {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.insight-item {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 28px 30px;
  box-shadow: var(--shadow-warm-sm);
  transition: all var(--transition-gentle);
}

.insight-item:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-warm-md);
}

.insight-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-amber);
  margin-bottom: 10px;
  font-weight: 600;
}

.insight-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

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

/* ==========================================================================
   Long-form SEO Article Structure (TOC, Breadcrumbs, FAQ, Related)
   ========================================================================== */
.article-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.article-breadcrumb a {
  color: var(--text-secondary);
  transition: color var(--transition-gentle);
}

.article-breadcrumb a:hover {
  color: var(--accent-amber);
}

.article-breadcrumb-sep {
  color: var(--border-medium);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-top: 14px;
  flex-wrap: wrap;
}

.article-meta-badge {
  color: var(--accent-amber);
  background: var(--accent-amber-subtle);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  font-weight: 600;
}

/* 导读目录 (Table of Contents) */
.article-toc {
  background: var(--bg-sand);
  border: 1px solid var(--border-hairline);
  border-left: 3px solid var(--accent-amber);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 24px 28px;
  margin: 28px 0 36px;
}

.article-toc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.article-toc-list li a {
  color: var(--text-secondary);
  font-size: 0.94rem;
  transition: color var(--transition-gentle);
  display: block;
}

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

.article-toc-list .toc-sub {
  padding-left: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* 内链高亮 */
.internal-link {
  color: var(--accent-amber);
  font-weight: 600;
  border-bottom: 1.5px solid var(--accent-amber);
  transition: opacity var(--transition-gentle);
}

.internal-link:hover {
  opacity: 0.8;
}

/* 文章内部技术数据卡片与表格 */
.article-data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.94rem;
}

.article-data-table th,
.article-data-table td {
  padding: 12px 16px;
  border: 1px solid var(--border-hairline);
  text-align: left;
}

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

.article-data-table tr:hover {
  background: var(--bg-sand);
}

/* 文章内置 FAQ 手风琴卡片 */
.article-faq-container {
  margin: 40px 0 32px;
  background: var(--bg-sand);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 24px;
}

.article-faq-container h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.article-faq-item {
  border-bottom: 1px solid var(--border-hairline);
  padding: 14px 0;
}

.article-faq-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.article-faq-q {
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  font-size: 0.98rem;
}

.article-faq-a {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* 相关阅读卡片网格 */
.related-reading-section {
  margin-top: 48px;
  border-top: 1px solid var(--border-hairline);
  padding-top: 36px;
}

.related-reading-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.related-reading-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.related-card {
  background: var(--bg-sand);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  transition: all var(--transition-gentle);
  display: block;
}

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

.related-card-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent-amber);
  font-weight: 600;
  margin-bottom: 6px;
}

.related-card-title {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
}

/* ==========================================================================
   Responsive Adaptations (@media Queries)
   ========================================================================== */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.6rem;
  }
  .advantages-grid,
  .tactile-pricing-grid,
  .reviews-editorial-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .dual-editorial-grid {
    grid-template-columns: 1fr;
  }
  .spec-row-info {
    flex-direction: column;
    gap: 4px;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
  }
  .nav-container {
    height: 62px;
  }
  .nav-menu {
    position: fixed;
    top: 63px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-hairline);
    padding: 20px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    display: none;
    box-shadow: var(--shadow-warm-lg);
  }
  .nav-menu.is-active {
    display: flex;
  }
  .mobile-toggle {
    display: flex;
  }
  .hero-editorial {
    padding: 48px 0 36px;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-intro {
    font-size: 1.05rem;
  }
  .advantages-grid,
  .tactile-pricing-grid,
  .reviews-editorial-grid {
    grid-template-columns: 1fr;
  }
  .editorial-table-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .uptime-segment {
    gap: 1.5px;
  }
  .article-body-card {
    padding: 24px 20px;
  }
  .footer-nav-bar {
    flex-direction: column;
    gap: 12px;
  }
  .footer-nav-link {
    width: 100%;
    text-align: center;
    background: var(--bg-sand);
  }
}