/* ===================================================================
   鲤云 (LiYun / Koi Cloud) - 东方禅意极简艺术设计系统 (Zen-Minimalist Art System)
   陶瓷素白 (#F7F8FA) · 澄澈水影 (#E2E6EC) · 浓郁松烟墨 (#141416) · 丹顶朱砂赤 (#E63946)
   =================================================================== */

/* --- 1. 色彩与物理设计变量 --- */
:root {
  /* 白瓷基底 (Light Mode - 默认白天) */
  --color-porcelain: #F7F8FA;
  --color-porcelain-card: #FFFFFF;
  --color-porcelain-basin: #FFFFFF;
  --color-water-gray: #E2E6EC;
  --color-water-subtle: #F1F4F8;
  --color-water-mist: rgba(226, 230, 236, 0.5);
  
  /* 墨色系统 (Sumi-Ink Gradient Hierarchy) */
  --ink-primary: #141416;
  --ink-secondary: #3F3F46;
  --ink-muted: #71717A;
  --ink-light: #A1A1AA;
  --ink-faint: #E4E4E7;

  /* 核心印记色：丹砂朱红 (Imperial Cinnabar Vermilion) */
  --cinnabar: #E63946;
  --cinnabar-hover: #D62839;
  --cinnabar-light: #FF5263;
  --cinnabar-subtle: rgba(230, 57, 70, 0.08);
  --cinnabar-glow: rgba(230, 57, 70, 0.25);

  /* 页面背景与玻璃拟态 */
  --bg-body: #F7F8FA;
  --bg-surface: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FCFCFD;
  --bg-glass: rgba(247, 248, 250, 0.88);

  /* 极简发丝边框 */
  --border-hairline: rgba(20, 20, 22, 0.06);
  --border-light: #E5E7EB;
  --border-delicate: #EAECEF;
  --border-ink: rgba(20, 20, 22, 0.14);
  --border-cinnabar: rgba(230, 57, 70, 0.35);

  /* 水墨微光与晕染阴影 */
  --shadow-basin: inset 0 2px 14px rgba(20, 20, 22, 0.03), 0 20px 48px -12px rgba(20, 20, 22, 0.06), 0 0 0 1px rgba(20, 20, 22, 0.05);
  --shadow-card: 0 4px 20px -4px rgba(20, 20, 22, 0.04), 0 1px 3px rgba(20, 20, 22, 0.02);
  --shadow-elevation: 0 16px 36px -6px rgba(20, 20, 22, 0.08), 0 2px 8px -2px rgba(20, 20, 22, 0.03);
  --shadow-ink-bleed: 0 18px 44px -8px rgba(20, 20, 22, 0.12), 0 0 28px -4px rgba(230, 57, 70, 0.12);

  /* 圆角与排版度量 */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --container-max: 1180px;
  --header-height: 74px;

  /* 物理动效曲线 */
  --spring-physics: cubic-bezier(0.34, 1.56, 0.64, 1);
  --water-flow: cubic-bezier(0.25, 1, 0.5, 1);
  --transition-theme: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

/* 禅意夜泊水墨模式 (Dark Mode) */
[data-theme="dark"] {
  --color-porcelain: #0D0E12;
  --color-porcelain-card: #14151B;
  --color-porcelain-basin: #13141B;
  --color-water-gray: #1E2029;
  --color-water-subtle: #191B22;
  --color-water-mist: rgba(30, 32, 41, 0.4);

  --ink-primary: #F4F4F5;
  --ink-secondary: #D4D4D8;
  --ink-muted: #A1A1AA;
  --ink-light: #71717A;
  --ink-faint: #27272A;

  --cinnabar: #FF4D5E;
  --cinnabar-hover: #FF3347;
  --cinnabar-light: #FF6B7A;
  --cinnabar-subtle: rgba(255, 77, 94, 0.12);
  --cinnabar-glow: rgba(255, 77, 94, 0.28);

  --bg-body: #0D0E12;
  --bg-surface: #14151B;
  --bg-card: #14151B;
  --bg-card-hover: #191B24;
  --bg-glass: rgba(13, 14, 18, 0.88);

  --border-hairline: rgba(255, 255, 255, 0.06);
  --border-light: #242733;
  --border-delicate: #1F222C;
  --border-ink: rgba(244, 244, 245, 0.12);
  --border-cinnabar: rgba(255, 77, 94, 0.4);

  --shadow-basin: inset 0 2px 20px rgba(0, 0, 0, 0.45), 0 24px 50px -10px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.08);
  --shadow-card: 0 4px 20px -4px rgba(0, 0, 0, 0.4);
  --shadow-elevation: 0 16px 40px -6px rgba(0, 0, 0, 0.65);
  --shadow-ink-bleed: 0 20px 48px -8px rgba(0, 0, 0, 0.85), 0 0 32px -4px rgba(255, 77, 94, 0.18);
}

/* --- 2. 基础重置与优雅排版 --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

[id] {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

body {
  background-color: var(--bg-body);
  color: var(--ink-primary);
  line-height: 1.75;
  transition: var(--transition-theme);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 澄澈水面交互画布 (无锯齿直线，纯净圆弧与柔光水波) */
#waterCausticCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.75;
}

[data-theme="dark"] #waterCausticCanvas {
  opacity: 0.35;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

ul, ol {
  list-style: none;
}

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

/* --- 3. 头部导航 (Navbar) --- */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-hairline);
  z-index: 1000;
  transition: var(--transition-theme);
}

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

/* 品牌金石印章标识 */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.3rem;
  font-weight: 750;
  letter-spacing: -0.01em;
  color: var(--ink-primary);
}

.brand-seal-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--ink-primary);
  color: #FFFFFF;
  position: relative;
  transition: transform 0.3s ease;
  box-shadow: 0 2px 8px rgba(20, 20, 22, 0.15);
}

[data-theme="dark"] .brand-seal-icon {
  background: #F4F4F5;
  color: #141416;
}

.cinnabar-dot {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 6px;
  height: 6px;
  background-color: var(--cinnabar);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--cinnabar-glow);
}

.brand-name-text {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.brand-name-sub {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--ink-muted);
  margin-left: 4px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* 导航目录 (首页 + 核心板块 + 推荐资讯) */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-secondary);
  padding: 8px 4px;
  position: relative;
  transition: color 0.25s ease;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--cinnabar);
  transition: width 0.3s var(--water-flow), left 0.3s var(--water-flow);
  border-radius: 2px;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
  left: 0;
}

.nav-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--cinnabar);
  font-weight: 600;
}

.nav-link-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background-color: var(--cinnabar);
  border-radius: 50%;
  display: inline-block;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 精致专业昼夜模式切换按钮 */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-water-subtle);
  border: 1px solid var(--border-hairline);
  color: var(--ink-secondary);
  transition: all 0.3s var(--spring-physics);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.theme-toggle-btn:hover {
  background: var(--color-porcelain-card);
  border-color: var(--border-ink);
  color: var(--ink-primary);
  transform: scale(1.05);
}

.theme-icon {
  width: 19px;
  height: 19px;
  transition: transform 0.4s var(--spring-physics);
}

.theme-icon-sun {
  display: block;
}

.theme-icon-moon {
  display: none;
}

[data-theme="dark"] .theme-icon-sun {
  display: none;
}

[data-theme="dark"] .theme-icon-moon {
  display: block;
  transform: rotate(360deg);
}

.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-water-subtle);
  color: var(--ink-primary);
}

/* --- 4. 纯粹按钮系统 (CTA Buttons) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.28s var(--water-flow);
  border: 1px solid transparent;
  line-height: 1.4;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background-color: var(--ink-primary);
  color: #FFFFFF !important;
  border-color: var(--ink-primary);
  box-shadow: 0 4px 14px rgba(20, 20, 22, 0.12);
}

[data-theme="dark"] .btn-primary {
  background-color: #F4F4F5;
  color: #141416 !important;
  border-color: #F4F4F5;
}

.btn-primary:hover {
  background-color: var(--cinnabar);
  border-color: var(--cinnabar);
  color: #FFFFFF !important;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--cinnabar-glow);
}

.btn-secondary {
  background-color: transparent;
  color: var(--ink-primary);
  border-color: var(--border-light);
}

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

.btn-lg {
  padding: 14px 34px;
  font-size: 1.02rem;
  letter-spacing: 0.4px;
}

.btn-sm {
  padding: 7px 18px;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

.btn-icon {
  width: 16px;
  height: 16px;
  transition: transform 0.2s ease;
}

.btn:hover .btn-icon {
  transform: translateX(3px);
}

/* --- 5. 主视觉区与白瓷浅池 (Hero & Porcelain Water Basin) --- */
.hero-section {
  padding: 70px 0 85px 0;
  position: relative;
  overflow: hidden;
  text-align: center;
}

/* 禅意白瓷浅池 (Porcelain Water Basin) */
.porcelain-basin-stage {
  width: 330px;
  height: 330px;
  margin: 0 auto 34px auto;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.porcelain-basin {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  position: relative;
  background: radial-gradient(circle at 50% 48%, #FFFFFF 0%, #F6F8FB 55%, #E9EDF4 85%, #DFE5EE 100%);
  box-shadow: var(--shadow-basin);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.4s ease;
}

[data-theme="dark"] .porcelain-basin {
  background: radial-gradient(circle at 50% 48%, #1A1C24 0%, #14151C 60%, #0D0E14 100%);
}

/* 水盂澄澈水光晕圈 (Water Glow & Depth Vignette) */
.basin-water-glow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 30%, rgba(255, 255, 255, 0.7) 0%, transparent 60%);
  pointer-events: none;
}

[data-theme="dark"] .basin-water-glow {
  background: radial-gradient(circle at 50% 30%, rgba(255, 255, 255, 0.08) 0%, transparent 60%);
}

/* 水盂天然微漾同心圆水纹 (Gentle Concentric Water Rings) */
.basin-ripple-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid rgba(20, 20, 22, 0.08);
  pointer-events: none;
}

[data-theme="dark"] .basin-ripple-ring {
  border-color: rgba(255, 255, 255, 0.08);
}

.basin-ripple-ring.ring-1 {
  width: 120px;
  height: 120px;
  animation: basinPulse 6s ease-out infinite;
}

.basin-ripple-ring.ring-2 {
  width: 200px;
  height: 200px;
  animation: basinPulse 6s ease-out 2s infinite;
}

.basin-ripple-ring.ring-3 {
  width: 270px;
  height: 270px;
  animation: basinPulse 6s ease-out 4s infinite;
}

@keyframes basinPulse {
  0% {
    transform: translate(-50%, -50%) scale(0.65);
    opacity: 0.6;
  }
  50% {
    opacity: 0.3;
  }
  100% {
    transform: translate(-50%, -50%) scale(1.15);
    opacity: 0;
  }
}

/* 水墨丹顶锦鲤本体架构 (High-Artistry Sumi-Ink Tancho Koi) */
.sumi-koi-container {
  width: 210px;
  height: 280px;
  position: relative;
  z-index: 2;
  animation: koiPatrolSwim 12s ease-in-out infinite alternate;
  filter: drop-shadow(0 14px 20px rgba(20, 20, 22, 0.12));
}

[data-theme="dark"] .sumi-koi-container {
  filter: drop-shadow(0 14px 24px rgba(0, 0, 0, 0.5));
}

.sumi-koi-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

/* 锦鲤鱼鳍与流体动力学关键帧 */
.koi-left-pectoral {
  transform-origin: 120px 106px;
  animation: koiPectoralLeft 4.5s ease-in-out infinite alternate;
}

.koi-right-pectoral {
  transform-origin: 180px 106px;
  animation: koiPectoralRight 4.2s ease-in-out infinite alternate;
}

.koi-caudal-tail {
  transform-origin: 150px 268px;
  animation: koiCaudalTail 5s ease-in-out infinite alternate;
}

.koi-caudal-veil-left {
  transform-origin: 146px 268px;
  animation: koiTailVeilLeft 5.2s ease-in-out infinite alternate;
}

.koi-caudal-veil-right {
  transform-origin: 154px 268px;
  animation: koiTailVeilRight 4.8s ease-in-out infinite alternate;
}

/* 鱼身随波微动 */
@keyframes koiPatrolSwim {
  0% {
    transform: translateY(0px) rotate(-1deg);
  }
  33% {
    transform: translateY(-8px) rotate(2deg) translateX(4px);
  }
  66% {
    transform: translateY(4px) rotate(-2.5deg) translateX(-3px);
  }
  100% {
    transform: translateY(-5px) rotate(1.5deg);
  }
}

@keyframes koiPectoralLeft {
  0% { transform: rotate(0deg) skewY(0deg); opacity: 0.95; }
  100% { transform: rotate(-9deg) skewY(-5deg); opacity: 0.85; }
}

@keyframes koiPectoralRight {
  0% { transform: rotate(0deg) skewY(0deg); opacity: 0.95; }
  100% { transform: rotate(9deg) skewY(5deg); opacity: 0.85; }
}

@keyframes koiCaudalTail {
  0% { transform: rotate(0deg); }
  50% { transform: rotate(7deg); }
  100% { transform: rotate(-7deg); }
}

@keyframes koiTailVeilLeft {
  0% { transform: rotate(0deg) skewX(0deg); }
  50% { transform: rotate(9deg) skewX(4deg); }
  100% { transform: rotate(-6deg) skewX(-3deg); }
}

@keyframes koiTailVeilRight {
  0% { transform: rotate(0deg) skewX(0deg); }
  50% { transform: rotate(6deg) skewX(3deg); }
  100% { transform: rotate(-9deg) skewX(-4deg); }
}

/* 文人风微标 */
.hero-editorial-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: var(--color-porcelain-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--ink-secondary);
  margin-bottom: 24px;
  box-shadow: 0 2px 10px rgba(20, 20, 22, 0.03);
}

.hero-editorial-pill .cinnabar-mark {
  color: var(--cinnabar);
  font-weight: 700;
}

/* 大标题 - 包含品牌名‘鲤云’ */
.hero-title {
  font-size: 3.4rem;
  font-weight: 850;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--ink-primary);
  margin-bottom: 20px;
}

.hero-title .brand-highlight {
  color: var(--ink-primary);
  position: relative;
  display: inline-block;
}

.hero-title .brand-highlight::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 0;
  width: 100%;
  height: 8px;
  background: var(--cinnabar-subtle);
  border-radius: 4px;
  z-index: -1;
}

.hero-intro {
  font-size: 1.15rem;
  color: var(--ink-muted);
  line-height: 1.85;
  max-width: 760px;
  margin: 0 auto 38px auto;
  font-weight: 400;
}

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

/* 核心指标看板 */
.hero-metrics-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 24px 32px;
  background: var(--color-porcelain-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  text-align: left;
}

.metric-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 0 10px;
  border-left: 2px solid var(--border-light);
}

.metric-cell:first-child {
  border-left: 2px solid var(--cinnabar);
}

.metric-val {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--ink-primary);
  letter-spacing: -0.02em;
}

.metric-lbl {
  font-size: 0.82rem;
  color: var(--ink-muted);
  font-weight: 500;
}

/* --- 6. 通用区块结构 --- */
.section {
  padding: 96px 0;
  position: relative;
}

.section-porcelain {
  background-color: var(--bg-surface);
  transition: var(--transition-theme);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px auto;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--cinnabar);
  margin-bottom: 12px;
}

.section-kicker::before {
  content: '';
  width: 14px;
  height: 2px;
  background-color: var(--cinnabar);
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--ink-primary);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

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

/* --- 7. 产品核心优势 (3个图文卡片) --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 38px 30px;
  transition: all 0.3s var(--water-flow);
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-card);
}

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

.feature-seal-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--color-water-subtle);
  color: var(--ink-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  border: 1px solid var(--border-hairline);
  transition: all 0.25s ease;
}

.feature-card:hover .feature-seal-box {
  background: var(--ink-primary);
  color: #FFFFFF;
}

[data-theme="dark"] .feature-card:hover .feature-seal-box {
  background: #F4F4F5;
  color: #141416;
}

.feature-seal-box svg {
  width: 26px;
  height: 26px;
}

.feature-title {
  font-size: 1.28rem;
  font-weight: 750;
  color: var(--ink-primary);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.94rem;
  color: var(--ink-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.feature-pills {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-pill-item {
  font-size: 0.78rem;
  padding: 4px 10px;
  background: var(--color-water-subtle);
  color: var(--ink-secondary);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

/* --- 8. 流媒体图卡 & AI 支持图卡 (Showcase) --- */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 38px;
  transition: all 0.3s var(--water-flow);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
}

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

.showcase-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.showcase-icon-seal {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--ink-primary);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

[data-theme="dark"] .showcase-icon-seal {
  background: #F4F4F5;
  color: #141416;
}

.showcase-icon-seal svg {
  width: 24px;
  height: 24px;
}

.showcase-label {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--cinnabar);
  text-transform: uppercase;
}

.showcase-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--ink-primary);
}

.showcase-desc {
  font-size: 0.96rem;
  color: var(--ink-muted);
  line-height: 1.7;
  margin-bottom: 26px;
}

.clean-service-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 26px;
}

.clean-service-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--color-water-subtle);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-primary);
  border: 1px solid transparent;
}

.clean-service-item:hover {
  border-color: var(--border-hairline);
  background: var(--color-porcelain-card);
}

.clean-bullet-cinnabar {
  width: 6px;
  height: 6px;
  background-color: var(--cinnabar);
  border-radius: 50%;
  flex-shrink: 0;
}

.showcase-footer-stat {
  margin-top: auto;
  padding: 14px 18px;
  background: var(--color-water-subtle);
  border-left: 3px solid var(--cinnabar);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
}

.stat-label {
  color: var(--ink-muted);
}

.stat-value {
  font-weight: 700;
  color: var(--ink-primary);
}

/* --- 9. 零重力节点切换交互器 --- */
.node-switcher-box {
  background: var(--color-porcelain-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  margin-top: 48px;
  box-shadow: var(--shadow-card);
}

.node-switcher-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.node-switcher-title {
  font-size: 1.1rem;
  font-weight: 750;
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-switcher-hint {
  font-size: 0.82rem;
  color: var(--ink-muted);
}

.node-tabs-wrapper {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.node-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--color-water-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-secondary);
  cursor: pointer;
  transition: all 0.3s var(--spring-physics);
}

.node-tab-btn:hover {
  border-color: var(--ink-primary);
  color: var(--ink-primary);
}

.node-tab-btn.active {
  background: var(--ink-primary);
  color: #FFFFFF;
  border-color: var(--ink-primary);
  box-shadow: 0 4px 12px rgba(20, 20, 22, 0.15);
}

[data-theme="dark"] .node-tab-btn.active {
  background: #F4F4F5;
  color: #141416;
  border-color: #F4F4F5;
}

.node-indicator-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--ink-light);
  transition: all 0.3s var(--spring-physics);
}

.node-tab-btn.active .node-indicator-dot {
  background-color: var(--cinnabar);
  box-shadow: 0 0 8px var(--cinnabar-glow);
}

.node-details-display {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  border-top: 1px solid var(--border-hairline);
  margin-top: 16px;
  font-size: 0.88rem;
  color: var(--ink-muted);
  flex-wrap: wrap;
  gap: 12px;
}

.node-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: var(--ink-primary);
}

/* --- 10. 套餐价格表与水墨晕染扩散效果 --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.35s var(--water-flow);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.pricing-card::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: radial-gradient(circle, var(--cinnabar-subtle) 0%, transparent 70%);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  pointer-events: none;
  transition: width 0.6s var(--water-flow), height 0.6s var(--water-flow), opacity 0.4s ease;
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--cinnabar);
  box-shadow: var(--shadow-ink-bleed);
}

.pricing-card:hover::after {
  width: 140%;
  height: 140%;
  opacity: 1;
}

.pricing-card.featured {
  border-color: var(--ink-primary);
  background: var(--bg-surface);
}

[data-theme="dark"] .pricing-card.featured {
  border-color: var(--cinnabar);
}

.pricing-seal-badge {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--cinnabar);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 5px 16px;
  border-bottom-left-radius: var(--radius-sm);
  letter-spacing: 0.5px;
}

.pricing-header {
  margin-bottom: 24px;
}

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

.plan-tier-desc {
  font-size: 0.88rem;
  color: var(--ink-muted);
  min-height: 40px;
}

.plan-price-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 18px 0;
}

.price-unit {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--cinnabar);
}

.price-digit {
  font-size: 3.2rem;
  font-weight: 850;
  color: var(--ink-primary);
  line-height: 1;
  letter-spacing: -0.03em;
}

.price-freq {
  font-size: 0.88rem;
  color: var(--ink-muted);
  margin-left: 2px;
}

.pricing-divider {
  height: 1px;
  background: var(--border-hairline);
  margin-bottom: 24px;
}

.pricing-specs {
  margin-bottom: 32px;
  flex-grow: 1;
}

.spec-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--ink-primary);
  margin-bottom: 14px;
}

.spec-check-bullet {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-water-subtle);
  color: var(--cinnabar);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.spec-check-bullet svg {
  width: 10px;
  height: 10px;
}

.pricing-btn-box {
  margin-top: auto;
  position: relative;
  z-index: 2;
}

/* --- 11. 用户口碑评价 (无卡通，水墨印章化) --- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: all 0.3s var(--water-flow);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-ink);
  box-shadow: var(--shadow-elevation);
}

.review-seal-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.sumi-seal-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--color-water-subtle);
  border: 1px solid var(--border-hairline);
  color: var(--ink-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.05rem;
  font-family: serif, "Noto Serif SC", STSong, SimSun;
  position: relative;
}

.sumi-seal-avatar::after {
  content: '';
  position: absolute;
  bottom: -2px;
  right: -2px;
  width: 5px;
  height: 5px;
  background-color: var(--cinnabar);
  border-radius: 50%;
}

.reviewer-meta-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.reviewer-meta-role {
  font-size: 0.8rem;
  color: var(--ink-muted);
}

.review-quote-text {
  font-size: 0.95rem;
  color: var(--ink-secondary);
  line-height: 1.75;
  font-style: normal;
}

/* --- 12. 常见问题解答 (FAQ) --- */
.faq-box {
  max-width: 820px;
  margin: 0 auto;
}

.faq-row {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color 0.25s ease;
  box-shadow: var(--shadow-card);
}

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

.faq-trigger {
  width: 100%;
  padding: 22px 26px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink-primary);
  cursor: pointer;
}

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

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

.faq-collapse-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--water-flow), padding 0.35s ease;
  padding: 0 26px;
}

.faq-row.active .faq-collapse-body {
  max-height: 260px;
  padding: 0 26px 22px 26px;
}

.faq-text-content {
  font-size: 0.94rem;
  color: var(--ink-muted);
  line-height: 1.75;
}

/* --- 13. 底部号召横幅 --- */
.bottom-cta-banner {
  background: var(--color-porcelain-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 56px 40px;
  text-align: center;
  box-shadow: var(--shadow-basin);
  position: relative;
  overflow: hidden;
}

.bottom-cta-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 3px;
  background: var(--cinnabar);
  border-radius: 2px;
}

.cta-banner-title {
  font-size: 2.2rem;
  font-weight: 850;
  color: var(--ink-primary);
  margin-bottom: 14px;
}

.cta-banner-subtitle {
  font-size: 1.05rem;
  color: var(--ink-muted);
  max-width: 600px;
  margin: 0 auto 30px auto;
}

/* --- 14. 页脚 (仅保留4个标题) --- */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-hairline);
  padding: 42px 0 36px 0;
  margin-top: auto;
  transition: var(--transition-theme);
}

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

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

.footer-single-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-secondary);
  transition: color 0.2s ease;
  padding: 4px 0;
}

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

.footer-copy-text {
  font-size: 0.82rem;
  color: var(--ink-muted);
  letter-spacing: 0.2px;
}

/* --- 15. 独立文章与页面排版 --- */
.editorial-page-wrap {
  max-width: 860px;
  margin: 40px auto 80px auto;
  padding: 44px;
  background: var(--color-porcelain-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

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

.editorial-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--cinnabar);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.editorial-title {
  font-size: 2.2rem;
  font-weight: 850;
  color: var(--ink-primary);
  margin-bottom: 10px;
}

.editorial-meta {
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.editorial-content h2 {
  font-size: 1.3rem;
  font-weight: 750;
  color: var(--ink-primary);
  margin: 34px 0 14px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.editorial-content h2::before {
  content: '';
  width: 4px;
  height: 16px;
  background: var(--cinnabar);
  border-radius: 2px;
  display: inline-block;
}

.editorial-content p {
  font-size: 0.98rem;
  color: var(--ink-secondary);
  line-height: 1.85;
  margin-bottom: 18px;
}

.editorial-content ul {
  margin: 0 0 22px 22px;
  list-style: disc;
}

.editorial-content li {
  font-size: 0.95rem;
  color: var(--ink-secondary);
  line-height: 1.75;
  margin-bottom: 10px;
}

.editorial-back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-muted);
  margin-bottom: 24px;
  transition: color 0.2s ease;
}

.editorial-back-link:hover {
  color: var(--cinnabar);
}

.insight-article-box {
  background: var(--color-water-subtle);
  border-radius: var(--radius-sm);
  padding: 24px;
  margin-bottom: 24px;
  border-left: 3px solid var(--cinnabar);
}

.insight-article-title {
  font-size: 1.15rem;
  font-weight: 750;
  color: var(--ink-primary);
  margin-bottom: 10px;
}

.insight-article-snippet {
  font-size: 0.92rem;
  color: var(--ink-muted);
  line-height: 1.7;
}

/* --- 16. 移动端与全平台响应式适配 --- */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-metrics-board {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .section {
    padding: 64px 0;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-hairline);
    flex-direction: column;
    padding: 22px 28px;
    gap: 16px;
    box-shadow: var(--shadow-elevation);
  }

  .nav-menu.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .header-actions .btn {
    display: none;
  }

  .porcelain-basin-stage {
    width: 270px;
    height: 270px;
    margin-bottom: 28px;
  }

  .sumi-koi-container {
    width: 170px;
    height: 230px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

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

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

  .hero-actions .btn {
    width: 100%;
    min-height: 48px;
  }

  .hero-metrics-board {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .metric-cell {
    border-left: 2px solid var(--border-light);
    padding-left: 12px;
  }

  .features-grid,
  .showcase-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .clean-service-list {
    grid-template-columns: 1fr;
  }

  .showcase-card,
  .pricing-card {
    padding: 28px 22px;
  }

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

  .cta-banner-title {
    font-size: 1.7rem;
  }

  .footer-four-links {
    gap: 20px;
  }

  .editorial-page-wrap {
    padding: 26px 18px;
    margin: 20px auto 40px auto;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }

  .section-title {
    font-size: 1.65rem;
  }

  .btn-lg {
    padding: 12px 20px;
    font-size: 0.95rem;
  }
}