/* ==========================================================================
   悠兔机场 (YouTu Airport) - 枯山水禅意极简美学样式表
   Zen Wabi-Sabi Aesthetics · 纯原生 CSS · 零臃肿依赖 · 秒开级加载
   ========================================================================== */

/* --- 核心色彩与变量定义 --- */
:root {
  /* 白天模式：素砂庭院 (Pristine Zen Sand Floor) */
  --bg-sand: #EDE8DE;
  --bg-sand-subtle: #E5E0D5;
  --bg-stone: #F7F4EE;
  --bg-stone-hover: #FFFFFF;
  --bg-stone-active: #EAE5DC;
  
  --text-ink: #22201D;           /* 焦墨 */
  --text-charcoal: #48433C;      /* 浓墨/茶褐 */
  --text-muted: #7E766B;         /* 暮云灰 */
  
  --border-stone: rgba(72, 67, 60, 0.15);
  --border-stone-strong: rgba(72, 67, 60, 0.3);
  
  --seal-vermilion: #9E3726;     /* 朱砂印泥红 */
  --seal-vermilion-soft: rgba(158, 55, 38, 0.12);
  --bamboo-green: #3D5A4C;       /* 竹青墨绿 */
  --bamboo-soft: rgba(61, 90, 76, 0.12);
  
  --nav-bg: rgba(237, 232, 222, 0.88);
  --nav-border: rgba(72, 67, 60, 0.12);
  
  --shadow-stone: 0 10px 28px -6px rgba(50, 45, 38, 0.08), 0 2px 8px -2px rgba(50, 45, 38, 0.04);
  --shadow-stone-raised: 0 18px 36px -8px rgba(50, 45, 38, 0.12);
  --shadow-inset-groove: inset 0 2px 4px rgba(60, 50, 40, 0.06);
  
  --font-serif: "Songti SC", "Noto Serif SC", "STSong", "Source Han Serif SC", SimSun, Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  --radius-stone: 22px 28px 24px 30px;
  --radius-stone-sm: 12px 16px 14px 18px;
  --radius-full: 9999px;
  
  --max-width: 1180px;
  --transition-zen: 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

/* 夜间模式：玄石寂庭 (Night Zen Slate) */
[data-theme="dark"] {
  --bg-sand: #121417;
  --bg-sand-subtle: #0B0D0F;
  --bg-stone: #1A1D22;
  --bg-stone-hover: #22262D;
  --bg-stone-active: #14171A;
  
  --text-ink: #EDE8DE;           /* 月魄白 */
  --text-charcoal: #B3ADA1;      /* 铅灰白 */
  --text-muted: #726E65;         /* 苔藓枯灰 */
  
  --border-stone: rgba(255, 255, 255, 0.08);
  --border-stone-strong: rgba(255, 255, 255, 0.18);
  
  --seal-vermilion: #C9533F;     /* 幽夜朱印 */
  --seal-vermilion-soft: rgba(201, 83, 63, 0.18);
  --bamboo-green: #5C8370;       /* 幽篁月竹 */
  --bamboo-soft: rgba(92, 131, 112, 0.18);
  
  --nav-bg: rgba(18, 20, 23, 0.88);
  --nav-border: rgba(255, 255, 255, 0.07);
  
  --shadow-stone: 0 10px 28px -6px rgba(0, 0, 0, 0.5);
  --shadow-stone-raised: 0 18px 36px -8px rgba(0, 0, 0, 0.7);
  --shadow-inset-groove: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* --- 全局重置与排版 --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-sand);
  color: var(--text-charcoal);
  line-height: 1.7;
  transition: background-color var(--transition-zen), color var(--transition-zen);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

/* 枯山水砂纹地表背景底图 */
.zen-sand-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
  background-image: 
    radial-gradient(circle at 18% 25%, rgba(0, 0, 0, 0.035) 0%, transparent 45%),
    radial-gradient(circle at 82% 70%, rgba(0, 0, 0, 0.04) 0%, transparent 50%),
    repeating-radial-gradient(ellipse at 50% 50%, transparent, transparent 18px, rgba(120, 110, 95, 0.045) 19px, transparent 20px);
}

[data-theme="dark"] .zen-sand-background {
  opacity: 0.35;
  background-image: 
    radial-gradient(circle at 18% 25%, rgba(255, 255, 255, 0.03) 0%, transparent 45%),
    radial-gradient(circle at 82% 70%, rgba(255, 255, 255, 0.03) 0%, transparent 50%),
    repeating-radial-gradient(ellipse at 50% 50%, transparent, transparent 18px, rgba(255, 255, 255, 0.035) 19px, transparent 20px);
}

/* 交互式砂波画布 (Sand Rake Canvas) */
#sand-rake-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 1;
}

/* 月兔幽影缓缓掠过 (Celestial Moon Rabbit drifting shadow) */
.moon-rabbit-drift {
  position: fixed;
  top: 15vh;
  left: -200px;
  width: 180px;
  height: 140px;
  pointer-events: none;
  z-index: 2;
  opacity: 0.038;
  animation: moonRabbitDriftAnimation 75s linear infinite;
  transform: rotate(-5deg);
}

[data-theme="dark"] .moon-rabbit-drift {
  opacity: 0.055;
  filter: invert(1);
}

@keyframes moonRabbitDriftAnimation {
  0% { transform: translate(-100px, 0) scale(0.9); }
  50% { transform: translate(55vw, 25vh) scale(1.1); }
  100% { transform: translate(110vw, 15vh) scale(0.95); }
}

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

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 3;
}

/* --- 东方极简边栏竖排书法字饰 (Vertical Typography Accent) --- */
.vertical-zen-flank {
  position: fixed;
  left: 20px;
  top: 120px;
  writing-mode: vertical-rl;
  font-family: var(--font-serif);
  font-size: 0.82rem;
  letter-spacing: 0.45em;
  color: var(--text-muted);
  opacity: 0.6;
  pointer-events: none;
  z-index: 99;
  user-select: none;
}

@media (max-width: 1280px) {
  .vertical-zen-flank { display: none; }
}

/* --- 顶部导航栏 (枯山水茶室质感) --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--nav-border);
  transition: background-color var(--transition-zen), border-color var(--transition-zen);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-ink);
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

/* 品牌印章标识 */
.brand-seal {
  width: 36px;
  height: 36px;
  border: 1.5px solid var(--seal-vermilion);
  border-radius: 6px;
  color: var(--seal-vermilion);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: var(--seal-vermilion-soft);
  position: relative;
}

.brand-tag-zen {
  font-size: 0.75rem;
  font-family: var(--font-sans);
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--bamboo-soft);
  color: var(--bamboo-green);
  border: 1px solid var(--border-stone);
  letter-spacing: 0.05em;
}

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

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-charcoal);
  padding: 6px 0;
  position: relative;
  letter-spacing: 0.03em;
}

.nav-link:hover {
  color: var(--seal-vermilion);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 1.5px;
  background: var(--seal-vermilion);
  transition: width var(--transition-zen);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

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

/* 昼夜模式切换按钮：东亚禅意日月墨韵切换，精致透明无粗糙emoji */
.zen-theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--bg-stone);
  border: 1px solid var(--border-stone-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-charcoal);
  transition: all var(--transition-zen);
  position: relative;
}

.zen-theme-toggle:hover {
  background: var(--bg-stone-hover);
  color: var(--seal-vermilion);
  border-color: var(--seal-vermilion);
  transform: rotate(15deg);
}

.theme-icon-sun,
.theme-icon-moon {
  width: 18px;
  height: 18px;
  position: absolute;
  transition: opacity 0.35s ease, transform 0.4s ease;
}

:root:not([data-theme="dark"]) .theme-icon-sun {
  opacity: 1;
  transform: scale(1);
}
:root:not([data-theme="dark"]) .theme-icon-moon {
  opacity: 0;
  transform: scale(0.4) rotate(45deg);
}

[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
  transform: scale(0.4) rotate(-45deg);
}
[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
  transform: scale(1);
}

/* 导航 CTA 按钮 */
.btn-zen-cta {
  padding: 8px 18px;
  border-radius: var(--radius-stone-sm);
  background: var(--text-ink);
  color: var(--bg-sand);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: var(--shadow-stone);
  transition: all var(--transition-zen);
}

.btn-zen-cta:hover {
  background: var(--seal-vermilion);
  color: #ffffff;
  transform: translateY(-2px);
}

.mobile-menu-btn {
  display: none;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  color: var(--text-ink);
  background: var(--bg-stone);
  border: 1px solid var(--border-stone);
}

/* --- 主视觉区 (Hero Section) --- */
.hero-section {
  padding: 80px 0 65px;
  text-align: center;
  position: relative;
}

.hero-wabi-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: var(--bg-stone);
  border: 1px solid var(--border-stone);
  font-size: 0.85rem;
  color: var(--text-charcoal);
  margin-bottom: 24px;
}

.hero-seal-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--seal-vermilion);
}

/* 标题包含当前品牌名 */
.hero-title {
  font-family: var(--font-serif);
  font-size: 3.2rem;
  font-weight: 700;
  color: var(--text-ink);
  line-height: 1.25;
  letter-spacing: 0.06em;
  margin-bottom: 22px;
}

.hero-brand-highlight {
  color: var(--seal-vermilion);
  position: relative;
  display: inline-block;
}

.hero-brand-highlight::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 100%;
  height: 6px;
  background: var(--seal-vermilion-soft);
  z-index: -1;
  border-radius: 4px;
}

/* 醒目简介 */
.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-charcoal);
  line-height: 1.85;
  max-width: 720px;
  margin: 0 auto 36px;
}

.hero-cta-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.btn-zen-primary {
  padding: 14px 34px;
  border-radius: var(--radius-stone-sm);
  background: var(--text-ink);
  color: var(--bg-sand);
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-stone);
  transition: all var(--transition-zen);
}

.btn-zen-primary:hover {
  background: var(--seal-vermilion);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-stone-raised);
}

.btn-zen-secondary {
  padding: 14px 30px;
  border-radius: var(--radius-stone-sm);
  background: var(--bg-stone);
  color: var(--text-ink);
  border: 1px solid var(--border-stone-strong);
  font-size: 1.02rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-zen);
}

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

/* --- 添水 (Sōzu 竹流水景开关) & 节点磬石庭院 --- */
.zen-nodes-board {
  background: var(--bg-stone);
  border: 1px solid var(--border-stone);
  border-radius: var(--radius-stone);
  padding: 30px 32px;
  box-shadow: var(--shadow-stone);
  margin-top: 10px;
  position: relative;
  overflow: hidden;
}

.zen-sozu-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px dashed var(--border-stone-strong);
  padding-bottom: 18px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.sozu-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-ink);
}

/* 添水竹筒交互控制 */
.bamboo-sozu-trigger {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px;
  border-radius: var(--radius-stone-sm);
  background: var(--bamboo-soft);
  color: var(--bamboo-green);
  border: 1px solid var(--bamboo-green);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-zen);
}

.bamboo-sozu-trigger:hover {
  background: var(--bamboo-green);
  color: #ffffff;
}

.bamboo-pipe-icon {
  width: 18px;
  height: 18px;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.bamboo-sozu-trigger.tipping .bamboo-pipe-icon {
  transform: rotate(45deg);
}

/* 自然江河润石节点 (River Rocks Server Clusters) */
.river-rocks-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.rock-node-card {
  background: var(--bg-sand);
  border: 1.5px solid var(--border-stone);
  border-radius: var(--radius-stone-sm);
  padding: 18px 16px;
  cursor: pointer;
  transition: all var(--transition-zen);
  display: flex;
  flex-direction: column;
  position: relative;
  user-select: none;
}

.rock-node-card:hover {
  transform: translateY(-4px);
  border-color: var(--text-ink);
  background: var(--bg-stone-hover);
  box-shadow: var(--shadow-stone);
}

.rock-node-card:active {
  transform: scale(0.97);
}

.rock-node-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.rock-node-name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-ink);
}

.rock-material-type {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.rock-latency-seal {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--seal-vermilion);
  padding: 4px 8px;
  border-radius: 4px;
  background: var(--seal-vermilion-soft);
  border: 1px dashed var(--seal-vermilion);
  align-self: flex-start;
  margin-top: 6px;
}

.rock-status-pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--bamboo-green);
}

/* --- 通用章节布局 --- */
.section {
  padding: 75px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}

.section-stamp {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 0.82rem;
  color: var(--seal-vermilion);
  letter-spacing: 0.15em;
  padding: 2px 10px;
  border: 1px solid var(--seal-vermilion);
  border-radius: 4px;
  margin-bottom: 14px;
  background: var(--seal-vermilion-soft);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.3rem;
  font-weight: 700;
  color: var(--text-ink);
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-charcoal);
  line-height: 1.75;
}

/* --- 产品核心优势 (3个图文卡片) --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-stone-card {
  background: var(--bg-stone);
  border: 1px solid var(--border-stone);
  border-radius: var(--radius-stone);
  padding: 38px 30px;
  box-shadow: var(--shadow-stone);
  transition: all var(--transition-zen);
  display: flex;
  flex-direction: column;
  position: relative;
}

.feature-stone-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-stone-strong);
  box-shadow: var(--shadow-stone-raised);
}

.feature-seal-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  border: 1.5px solid var(--border-stone-strong);
  background: var(--bg-sand);
  color: var(--seal-vermilion);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-charcoal);
  line-height: 1.75;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-points {
  border-top: 1px dashed var(--border-stone);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.feature-point-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

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

/* --- 流媒体图卡 (素雅水墨质感) --- */
.streaming-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.stream-stone-card {
  background: var(--bg-stone);
  border: 1px solid var(--border-stone);
  border-radius: var(--radius-stone-sm);
  padding: 24px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: var(--shadow-stone);
  transition: all var(--transition-zen);
}

.stream-stone-card:hover {
  transform: translateY(-4px);
  border-color: var(--seal-vermilion);
  box-shadow: var(--shadow-stone-raised);
}

.stream-symbol {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  background: var(--bg-sand);
  border: 1px solid var(--border-stone);
  color: var(--text-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.stream-stone-card h4 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 6px;
}

.stream-tag-zen {
  font-size: 0.75rem;
  color: var(--bamboo-green);
  padding: 2px 8px;
  background: var(--bamboo-soft);
  border-radius: var(--radius-full);
  margin-bottom: 8px;
  border: 1px solid var(--border-stone);
}

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

/* --- AI 工具支持图卡 (严守原则：无闪烁星星与魔法棒，纯石板水墨) --- */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.ai-stone-card {
  background: var(--bg-stone);
  border: 1px solid var(--border-stone);
  border-radius: var(--radius-stone);
  padding: 28px 24px;
  box-shadow: var(--shadow-stone);
  transition: all var(--transition-zen);
  display: flex;
  flex-direction: column;
}

.ai-stone-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-stone-strong);
  box-shadow: var(--shadow-stone-raised);
}

.ai-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.ai-ink-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--bg-sand);
  border: 1px solid var(--border-stone-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-ink);
  flex-shrink: 0;
}

.ai-card-title {
  font-family: var(--font-serif);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--text-ink);
}

.ai-tag-line {
  font-size: 0.78rem;
  color: var(--bamboo-green);
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 2px;
}

.ai-card-desc {
  font-size: 0.92rem;
  color: var(--text-charcoal);
  line-height: 1.68;
  margin-bottom: 18px;
  flex-grow: 1;
}

.ai-pill-wrap {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.ai-pill {
  font-size: 0.75rem;
  padding: 3px 9px;
  border-radius: 4px;
  background: var(--bg-sand);
  border: 1px solid var(--border-stone);
  color: var(--text-muted);
}

/* --- 套餐价格对比表 (参考网上真实机场套餐) --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.pricing-stone-card {
  background: var(--bg-stone);
  border: 1.5px solid var(--border-stone);
  border-radius: var(--radius-stone);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-stone);
  transition: all var(--transition-zen);
}

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

.pricing-stone-card.popular {
  border-color: var(--seal-vermilion);
  background: var(--bg-stone-hover);
}

.popular-seal-stamp {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--seal-vermilion);
  color: #ffffff;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 3px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.pricing-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 6px;
}

.pricing-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 22px;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--border-stone);
}

.price-currency {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-ink);
}

.price-num {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--text-ink);
  line-height: 1;
}

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

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

.pricing-feature-row {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 0.92rem;
  color: var(--text-charcoal);
}

.pricing-feature-row svg {
  color: var(--bamboo-green);
  flex-shrink: 0;
  margin-top: 3px;
}

.btn-pricing-cta {
  width: 100%;
  padding: 13px 0;
  border-radius: var(--radius-stone-sm);
  font-size: 0.98rem;
  font-weight: 600;
  text-align: center;
  transition: all var(--transition-zen);
  display: inline-block;
  letter-spacing: 0.05em;
}

.btn-pricing-primary {
  background: var(--text-ink);
  color: var(--bg-sand);
}

.btn-pricing-primary:hover {
  background: var(--seal-vermilion);
  color: #ffffff;
}

.btn-pricing-secondary {
  background: var(--bg-sand);
  color: var(--text-ink);
  border: 1px solid var(--border-stone-strong);
}

.btn-pricing-secondary:hover {
  border-color: var(--text-ink);
  background: var(--bg-stone-hover);
}

/* --- 用户评价 (Testimonials) --- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-stone-card {
  background: var(--bg-stone);
  border: 1px solid var(--border-stone);
  border-radius: var(--radius-stone);
  padding: 30px 26px;
  box-shadow: var(--shadow-stone);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-zen);
}

.review-stone-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-stone-strong);
}

.review-seal-stars {
  display: flex;
  gap: 5px;
  color: var(--seal-vermilion);
  margin-bottom: 16px;
}

.review-body {
  font-size: 0.95rem;
  color: var(--text-charcoal);
  line-height: 1.75;
  margin-bottom: 24px;
  flex-grow: 1;
}

.review-user-row {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px dashed var(--border-stone);
  padding-top: 18px;
}

.review-user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-sand);
  border: 1px solid var(--border-stone-strong);
  color: var(--text-ink);
  font-family: var(--font-serif);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.review-user-info h5 {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-ink);
}

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

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

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

.faq-stone-item.active {
  border-color: var(--seal-vermilion);
}

.faq-q-btn {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-ink);
  text-align: left;
  transition: color var(--transition-zen);
}

.faq-q-btn:hover {
  color: var(--seal-vermilion);
}

.faq-arrow {
  width: 18px;
  height: 18px;
  transition: transform 0.3s ease;
  color: var(--text-muted);
  flex-shrink: 0;
}

.faq-stone-item.active .faq-arrow {
  transform: rotate(180deg);
  color: var(--seal-vermilion);
}

.faq-a-box {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.25, 1, 0.5, 1);
  padding: 0 24px;
}

.faq-stone-item.active .faq-a-box {
  padding-bottom: 22px;
}

.faq-a-box p {
  font-size: 0.95rem;
  color: var(--text-charcoal);
  line-height: 1.75;
}

/* --- 底栏大号行动呼吁 (Bottom CTA) --- */
.bottom-cta-banner {
  padding: 50px 0 60px;
}

.zen-cta-box {
  background: var(--text-ink);
  color: var(--bg-sand);
  border-radius: var(--radius-stone);
  padding: 48px 40px;
  text-align: center;
  box-shadow: var(--shadow-stone-raised);
}

.zen-cta-box h3 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.zen-cta-box p {
  font-size: 1.05rem;
  opacity: 0.85;
  max-width: 620px;
  margin: 0 auto 30px;
}

.btn-zen-white {
  background: var(--bg-sand);
  color: var(--text-ink);
  padding: 14px 36px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-stone-sm);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-zen);
}

.btn-zen-white:hover {
  background: var(--seal-vermilion);
  color: #ffffff;
  transform: translateY(-2px);
}

/* --- 规范页脚 (严格只保留四个标题) --- */
.site-footer {
  background: var(--bg-stone);
  border-top: 1px solid var(--border-stone);
  padding: 40px 0 30px;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

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

.footer-link {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-ink);
  padding: 6px 10px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  transition: all var(--transition-zen);
}

.footer-link:hover {
  color: var(--seal-vermilion);
  background: var(--seal-vermilion-soft);
}

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

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

/* --- 子页面专用通用样式 --- */
.subpage-hero {
  padding: 60px 0 40px;
  background: var(--bg-sand-subtle);
  border-bottom: 1px solid var(--border-stone);
  text-align: center;
}

.subpage-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 12px;
}

.subpage-subtitle {
  font-size: 1.08rem;
  color: var(--text-charcoal);
  max-width: 620px;
  margin: 0 auto;
}

.subpage-content {
  padding: 55px 0 75px;
}

.article-box {
  background: var(--bg-stone);
  border: 1px solid var(--border-stone);
  border-radius: var(--radius-stone);
  padding: 46px;
  box-shadow: var(--shadow-stone);
  max-width: 900px;
  margin: 0 auto;
}

.article-box h2 {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-top: 36px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--border-stone);
}

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

.article-box p {
  font-size: 0.98rem;
  color: var(--text-charcoal);
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-box ul {
  margin-bottom: 20px;
  padding-left: 20px;
}

.article-box li {
  font-size: 0.96rem;
  color: var(--text-charcoal);
  line-height: 1.75;
  margin-bottom: 8px;
}

.highlight-box {
  background: var(--seal-vermilion-soft);
  border-left: 4px solid var(--seal-vermilion);
  padding: 16px 20px;
  border-radius: 0 10px 10px 0;
  margin: 22px 0;
}

.highlight-box p {
  margin-bottom: 0;
  color: var(--text-ink);
  font-weight: 500;
}

/* 资讯与推荐专用网格 */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.insight-card {
  background: var(--bg-sand);
  border: 1px solid var(--border-stone);
  border-radius: var(--radius-stone-sm);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-zen);
}

.insight-card:hover {
  transform: translateY(-4px);
  border-color: var(--text-ink);
  background: var(--bg-stone-hover);
  box-shadow: var(--shadow-stone);
}

.insight-date {
  font-family: var(--font-serif);
  font-size: 0.8rem;
  color: var(--seal-vermilion);
  margin-bottom: 10px;
}

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

.insight-summary {
  font-size: 0.92rem;
  color: var(--text-charcoal);
  line-height: 1.68;
  margin-bottom: 18px;
  flex-grow: 1;
}

.insight-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed var(--border-stone);
  padding-top: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 网站地图网格 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.sitemap-card {
  background: var(--bg-sand);
  border: 1px solid var(--border-stone);
  border-radius: var(--radius-stone-sm);
  padding: 24px;
}

.sitemap-card h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sitemap-card ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-left: 0;
}

.sitemap-card li {
  list-style: none;
  margin-bottom: 0;
}

.sitemap-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg-stone);
  border-radius: 6px;
  border: 1px solid var(--border-stone);
  color: var(--text-charcoal);
  font-weight: 500;
  transition: all var(--transition-zen);
}

.sitemap-link:hover {
  border-color: var(--seal-vermilion);
  color: var(--seal-vermilion);
  transform: translateX(4px);
}

/* ==========================================================================
   响应式媒体查询 (@media) - 确保手机端完美单栏自适应与手指触控
   ========================================================================== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .river-rocks-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .streaming-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 460px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.25rem;
  }
  .hero-subtitle {
    font-size: 1.02rem;
  }
  .river-rocks-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .streaming-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .ai-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .insights-grid {
    grid-template-columns: 1fr;
  }
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  .article-box {
    padding: 26px 18px;
  }
  
  .nav-menu {
    position: fixed;
    top: 74px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-stone);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-stone-raised);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
  
  .btn-zen-primary, .btn-zen-secondary, .btn-pricing-cta, .zen-cta-box .btn-zen-white {
    width: 100%;
    min-height: 48px;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.95rem;
  }
  .streaming-grid {
    grid-template-columns: 1fr;
  }
  .zen-cta-box {
    padding: 36px 20px;
  }
  .zen-cta-box h3 {
    font-size: 1.7rem;
  }
}

/* --- SEO 文章专有增强样式 (TOC, Meta, Callout, FAQs, Related) --- */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumbs a {
  color: var(--text-charcoal);
}

.breadcrumbs a:hover {
  color: var(--seal-vermilion);
}

.breadcrumbs span {
  opacity: 0.6;
}

.article-header {
  margin-bottom: 30px;
  padding-bottom: 22px;
  border-bottom: 1px dashed var(--border-stone);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 14px;
  flex-wrap: wrap;
}

.article-meta-bar span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

/* 目录 (Table of Contents) */
.toc-box {
  background: var(--bg-sand);
  border: 1px solid var(--border-stone-strong);
  border-radius: var(--radius-stone-sm);
  padding: 22px 26px;
  margin: 28px 0 36px;
}

.toc-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 20px;
}

.toc-list li {
  list-style: decimal;
  color: var(--text-charcoal);
  font-size: 0.94rem;
}

.toc-list a {
  color: var(--text-charcoal);
}

.toc-list a:hover {
  color: var(--seal-vermilion);
  text-decoration: underline;
}

/* 文章内部 FAQ 区块 */
.article-faq-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px dashed var(--border-stone);
}

.article-faq-item {
  background: var(--bg-sand);
  border: 1px solid var(--border-stone);
  border-radius: 8px;
  padding: 18px 22px;
  margin-bottom: 14px;
}

.article-faq-q {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-faq-a {
  font-size: 0.95rem;
  color: var(--text-charcoal);
  line-height: 1.7;
}

/* 相关阅读 (Related Readings) */
.related-reading-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px dashed var(--border-stone);
}

.related-reading-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-ink);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.related-link-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--bg-sand);
  border: 1px solid var(--border-stone);
  border-radius: 8px;
  color: var(--text-ink);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-zen);
}

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

@media (max-width: 768px) {
  .related-reading-grid {
    grid-template-columns: 1fr;
  }
}