/* ==========================================================================
   新中式极简主义太极页面设计系统 (TAIJI MODERN MINIMALISM DESIGN SYSTEM)
   核心理念：动静相生，大道至简。东方留白，气韵流转。
   重构版本：2026.09 · 全面升级
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 设计令牌与全局重置 (Design Tokens & Global Reset)
   东方五行色彩体系 + 排版规范 + 空间节奏
   -------------------------------------------------------------------------- */
:root {
  /* ── 基础主色：墨分五色、黛蓝沉香、宣纸白 ── */
  --bg-deep:              #0c1016;                       /* 黛蓝玄墨背景（告别死黑，注入沉静冷墨韵） */
  --bg-surface:           #141a24;                       /* 界面承载暗层 */
  --bg-surface-elevated:  #1b2330;                       /* 悬浮微光承载层 */
  --bg-card:              rgba(25, 33, 44, 0.65);        /* 通透玻璃拟态卡片 */
  --bg-card-hover:        rgba(36, 48, 64, 0.85);        /* 卡片悬停高光态 */
  
  /* ── 层次边框与立体高光 ── */
  --border-subtle:        rgba(255, 255, 255, 0.12);     /* 细腻明亮微光边框 */
  --border-active:        rgba(255, 255, 255, 0.28);     /* 激活态高亮描边 */
  --border-glow:          rgba(210, 230, 255, 0.4);      /* 月白流光边 */

  /* ── 文字与光辉 ── */
  --text-primary:         #f8f7f2;                       /* 宣纸纯净白主文本 */
  --text-secondary:       #aab2be;                       /* 水墨烟灰次要文本（提升明度） */
  --text-muted:           #788290;                       /* 雅致冷灰说明文本 */
  --ink-light:            rgba(255, 255, 255, 0.95);

  /* ── 东方传统点缀色与环境微光光环 ── */
  --color-vermilion:      #c74332;                       /* 朱砂红：印章、核心引导 */
  --color-vermilion-glow: rgba(199, 67, 50, 0.38);
  --color-bamboo:         #438c6b;                       /* 竹青：生机、宁静生命力 */
  --color-bamboo-glow:    rgba(67, 140, 107, 0.38);
  --color-quartz-purple:  #7d6092;                       /* 石英紫：心法、内修静虑 */
  --color-quartz-glow:    rgba(125, 96, 146, 0.38);
  --color-moonlight:      #d6e4f0;                       /* 月华银白 */
  --color-moonlight-glow: rgba(214, 228, 240, 0.25);

  /* ── 字体家族规范 ── */
  --font-serif:    "Noto Serif SC", "Source Han Serif CN", "Songti SC", "SimSun", serif;
  --font-sans:     "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", sans-serif;
  --font-en-serif: "Cinzel", "Bodoni MT", serif;

  /* ── 空间节奏与布局留白 ── */
  --space-unit:       8px;
  --section-padding:  clamp(80px, 12vh, 160px);
  --container-width:  1280px;

  /* ── 缓动曲线：行云流水 ── */
  --ease-smooth: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-fluid:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-taiji:  cubic-bezier(0.4, 0, 0.2, 1);
}


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

html {
  font-size: 16px;
  background-color: var(--bg-deep);
  color: var(--text-primary);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: auto;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.75;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  letter-spacing: 0.02em;
}

/* ── 东方水墨烟岚多层环境光晕 (Ambient Qi Gradients) ── */
body::before {
  content: "";
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background-image:
    /* 顶部天心月白漫射流光 */
    radial-gradient(ellipse at 50% 0%, rgba(140, 185, 240, 0.16) 0%, transparent 60%),
    /* 左侧竹青生机光脉 */
    radial-gradient(circle at 6% 38%, rgba(67, 140, 107, 0.15) 0%, transparent 45%),
    /* 右侧朱砂暖晖微光 */
    radial-gradient(circle at 94% 62%, rgba(199, 67, 50, 0.13) 0%, transparent 45%),
    /* 底部紫气东来与沉香底色 */
    radial-gradient(circle at 50% 88%, rgba(125, 96, 146, 0.14) 0%, transparent 50%),
    /* 垂直墨色分层渐变 */
    linear-gradient(180deg, #0c1016 0%, #111721 35%, #0e131b 70%, #0a0e13 100%);
  pointer-events: none;
  z-index: -2;
}

/* ── 墨韵噪点纹理叠加（提升高端质感） ── */
.noise-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  opacity: 0.025;
  pointer-events: none;
  z-index: 9999;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* ── 全屏画布层 ── */
/* 气韵光标粒子 Canvas */
#qi-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 10;
}

/* Three.js 3D 太极粒子星云容器 */
#taiji-webgl-container {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 1;
  pointer-events: auto;
}

/* ── 水墨晕染转场遮罩层 ── */
#ink-transition {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 9000;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
}
#ink-transition.active {
  pointer-events: auto;
  opacity: 1;
}

/* ── 页面内容容器规范 ── */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left:  clamp(20px, 5vw, 48px);
  padding-right: clamp(20px, 5vw, 48px);
  position: relative;
  z-index: 2;
}


/* --------------------------------------------------------------------------
   2. 极简悬浮导航栏 (Minimal Floating Header)
   -------------------------------------------------------------------------- */
.header-nav {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  padding: 24px 0;
  z-index: 100;
  transition: all 0.5s var(--ease-smooth);
}

/* 滚动后的毛玻璃磨砂态 */
.header-nav.scrolled {
  padding: 14px 0;
  background: rgba(9, 10, 11, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 东方太极品牌徽标 */
.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--text-primary);
}

/* 朱砂红篆刻印章 */
.nav-seal {
  width: 38px; height: 38px;
  background: var(--color-vermilion);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  border-radius: 4px;
  box-shadow: 0 0 16px var(--color-vermilion-glow);
  position: relative;
  letter-spacing: 0;
  flex-shrink: 0;
}

/* 印章内虚线内框 */
.nav-seal::after {
  content: "";
  position: absolute;
  inset: 2px;
  border: 1px dashed rgba(255, 255, 255, 0.4);
  border-radius: 2px;
  pointer-events: none;
}

.nav-title-group {
  display: flex;
  flex-direction: column;
}

.nav-title-zh {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  letter-spacing: 0.25em;
  font-weight: 600;
  line-height: 1.2;
}

.nav-title-en {
  font-family: var(--font-en-serif);
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* 导航链接组 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  letter-spacing: 0.12em;
  position: relative;
  padding: 6px 0;
  transition: color 0.3s ease;
  font-weight: 400;
}

/* 导航链接下划线浮现效果 */
.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0; left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 100%; height: 1.5px;
  background: linear-gradient(90deg, transparent, var(--text-primary), transparent);
  transition: transform 0.4s var(--ease-smooth);
}

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

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

/* 头部操作控件区 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

/* ── 空灵禅音声波切换按钮 ── */
.zen-audio-toggle {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: 40px;
  padding: 8px 16px;
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  transition: all 0.3s ease;
  font-family: inherit;
}

.zen-audio-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  border-color: var(--border-active);
}

.zen-audio-toggle.playing {
  border-color: var(--color-bamboo);
  color: #79c59c;
  box-shadow: 0 0 12px var(--color-bamboo-glow);
}

/* 声波动画指示 */
.sound-wave {
  display: flex;
  align-items: center;
  gap: 3px;
  height: 12px;
}

.sound-wave span {
  width: 2px; height: 4px;
  background: currentColor;
  border-radius: 2px;
  transition: height 0.3s ease;
}

.zen-audio-toggle.playing .sound-wave span:nth-child(1) {
  animation: soundPulse 1.2s ease-in-out infinite;
}
.zen-audio-toggle.playing .sound-wave span:nth-child(2) {
  animation: soundPulse 0.9s ease-in-out 0.2s infinite;
}
.zen-audio-toggle.playing .sound-wave span:nth-child(3) {
  animation: soundPulse 1.4s ease-in-out 0.4s infinite;
}

@keyframes soundPulse {
  0%, 100% { height: 3px; }
  50%      { height: 12px; }
}

/* ── 朱砂红核心按钮 ── */
.btn-seal {
  background: var(--color-vermilion);
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 10px 22px;
  font-family: var(--font-serif);
  font-size: 0.92rem;
  letter-spacing: 0.15em;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all 0.3s var(--ease-smooth);
  box-shadow: 0 4px 18px var(--color-vermilion-glow);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

/* 墨水涟漪微光覆盖层 */
.btn-seal::before {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 0; height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s var(--ease-fluid), height 0.6s var(--ease-fluid);
}

.btn-seal:hover::before {
  width: 300px; height: 300px;
}

.btn-seal:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(185, 58, 43, 0.5);
  filter: brightness(1.08);
}

.btn-seal:active {
  transform: translateY(0);
}

/* ── 透明描边按钮 ── */
.btn-outline-zen {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 12px 28px;
  font-size: 0.95rem;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  backdrop-filter: blur(8px);
  font-family: inherit;
}

.btn-outline-zen:hover {
  border-color: var(--border-active);
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-2px);
}

/* ── 移动端汉堡按钮 ── */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

/* ── 移动端全屏抽屉菜单 ── */
.mobile-drawer {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100vh;
  background: rgba(9, 10, 11, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 99;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.mobile-drawer.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer a {
  color: var(--text-primary);
  text-decoration: none;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  letter-spacing: 0.2em;
  transition: color 0.3s ease;
}

.mobile-drawer a:hover {
  color: var(--color-vermilion);
}


/* --------------------------------------------------------------------------
   3. 首屏体验 (Hero Section - 动静之初)
   -------------------------------------------------------------------------- */
.hero-section {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 100px;
  overflow: hidden;
  /* 顶部注入月华与天青环境流光 */
  background: 
    radial-gradient(ellipse at 50% 20%, rgba(160, 205, 255, 0.16) 0%, rgba(67, 140, 107, 0.08) 35%, transparent 70%),
    radial-gradient(circle at 50% 50%, rgba(20, 26, 36, 0.4) 0%, transparent 80%);
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 3;
  max-width: 900px;
  /* 让光标可穿透到 3D 太极粒子交互层 */
  pointer-events: none;
}

.hero-content a,
.hero-content button {
  pointer-events: auto;
}

/* 节气微标徽章 (通透玉白磨砂质感) */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 22px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 100px;
  font-size: 0.85rem;
  color: #e2e8f0;
  letter-spacing: 0.22em;
  margin-bottom: 28px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

/* 竹青生命呼吸圆点 */
.hero-badge-dot {
  width: 7px; height: 7px;
  background: #6ee7b7;
  border-radius: 50%;
  box-shadow: 0 0 10px #6ee7b7;
  animation: breathDot 3s ease-in-out infinite;
}

@keyframes breathDot {
  0%, 100% { opacity: 0.5; transform: scale(0.9); }
  50%      { opacity: 1;   transform: scale(1.35); box-shadow: 0 0 14px #6ee7b7; }
}

/* 核心主标题：宋体大字，带有玉石金属般立体光泽 */
.hero-title-group {
  margin-bottom: 24px;
}

.hero-subtitle-en {
  font-family: var(--font-en-serif);
  font-size: clamp(0.9rem, 1.8vw, 1.25rem);
  letter-spacing: 0.45em;
  color: rgba(226, 232, 240, 0.65);
  text-transform: uppercase;
  margin-bottom: 12px;
  display: block;
  text-shadow: 0 0 12px rgba(255, 255, 255, 0.15);
}

.hero-title {
  font-family: var(--font-serif);
  /* 优化字号上限与比例，确保 1920px 宽屏下文字舒展呈现且绝不回行 */
  font-size: clamp(2.4rem, 3.6vw, 3.8rem);
  font-weight: 500;
  letter-spacing: 0.12em;
  line-height: 1.25;
  white-space: nowrap;
  /* 玉石高光立体渐变字 */
  background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 45%, #cbd5e1 75%, #94a3b8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 12px 30px rgba(0, 0, 0, 0.9));
}


/* 标题中的"大道至简"温润金石渐变强调 */
.hero-title .emphasis {
  background: linear-gradient(135deg, #ffffff 10%, #e0f2fe 50%, #93c5fd 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  position: relative;
  filter: drop-shadow(0 0 25px rgba(186, 230, 253, 0.35));
}

/* 主标题下方描述 */
.hero-desc {
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: #b0b9c6;
  max-width: 640px;
  margin: 0 auto 42px;
  line-height: 2;
  font-weight: 300;
  letter-spacing: 0.05em;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}

/* 按钮组合 */
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* 视差滚动手势指引 */
.hero-scroll-indicator {
  position: absolute;
  bottom: 36px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  z-index: 3;
  pointer-events: none;
  animation: fadeInUp 1.5s ease 1.5s both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.mouse-icon {
  width: 20px; height: 32px;
  border: 1.5px solid rgba(255, 255, 255, 0.35);
  border-radius: 12px;
  position: relative;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.mouse-wheel {
  width: 3px; height: 6px;
  background: #ffffff;
  border-radius: 2px;
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  animation: mouseScroll 2s infinite ease-in-out;
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.8);
}

@keyframes mouseScroll {
  0%   { opacity: 1; transform: translate(-50%, 0); }
  100% { opacity: 0; transform: translate(-50%, 12px); }
}


/* --------------------------------------------------------------------------
   4. 水墨光芒分隔线装饰 (Ink Beam Divider)
   带有中央聚光扩散效果，打破平淡
   -------------------------------------------------------------------------- */
.ink-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 30px 0;
  opacity: 0.65;
  position: relative;
}

.ink-divider-line {
  height: 1.5px;
  width: 120px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
}

.ink-divider-symbol {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: #f1f5f9;
  letter-spacing: 0.3em;
  text-shadow: 0 0 12px rgba(255, 255, 255, 0.5);
  animation: rotateSlow 20s linear infinite;
}

@keyframes rotateSlow {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}


/* --------------------------------------------------------------------------
   5. 太极哲学四大维度 (Philosophy Section - 阴阳虚实)
   -------------------------------------------------------------------------- */
.section-philosophy {
  padding: var(--section-padding) 0;
  position: relative;
  /* 注入中央向四周弥散的月白水墨微光 */
  background: radial-gradient(ellipse at 50% 50%, rgba(35, 52, 75, 0.45) 0%, rgba(12, 16, 22, 0) 75%);
}

/* 通用章节头部 */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto clamp(48px, 8vh, 80px);
}

.section-subtitle {
  font-family: var(--font-en-serif);
  font-size: 0.85rem;
  letter-spacing: 0.35em;
  color: #ff8678;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: block;
  text-shadow: 0 0 10px rgba(199, 67, 50, 0.4);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.6vw, 2.8rem);
  font-weight: 500;
  letter-spacing: 0.15em;
  line-height: 1.3;
  margin-bottom: 16px;
  /* 玉石金石文字高光 */
  background: linear-gradient(180deg, #ffffff 0%, #e2e8f0 70%, #94a3b8 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-intro {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.9;
  font-weight: 300;
}

/* 哲学四维度栅格 */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* 哲学卡片：通透月岩玻璃拟态 + 上边缘白玉高光 */
.philo-card {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%), rgba(22, 29, 39, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 12px;
  padding: 40px 30px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 
    0 16px 36px rgba(0, 0, 0, 0.45),
    inset 0 1px 1px rgba(255, 255, 255, 0.22);
  transition: transform 0.5s var(--ease-smooth),
              border-color 0.5s ease,
              background 0.5s ease,
              box-shadow 0.5s ease;
  will-change: transform;
}

/* 卡片顶部动态光柱掠影 */
.philo-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
  transform: scaleX(0);
  transition: transform 0.5s var(--ease-smooth);
}

.philo-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 255, 255, 0.35);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.12) 0%, rgba(255, 255, 255, 0.03) 100%), rgba(30, 40, 55, 0.85);
  box-shadow: 
    0 24px 50px rgba(0, 0, 0, 0.6),
    0 0 30px rgba(140, 185, 240, 0.18),
    inset 0 1px 2px rgba(255, 255, 255, 0.4);
}

.philo-card:hover::before {
  transform: scaleX(1);
}

/* 大字暗纹水印 */
.philo-watermark {
  position: absolute;
  right: 14px; bottom: 6px;
  font-family: var(--font-serif);
  font-size: 5.8rem;
  color: rgba(255, 255, 255, 0.04);
  line-height: 1;
  pointer-events: none;
  font-weight: 700;
  transition: color 0.4s ease, transform 0.4s ease;
}

.philo-card:hover .philo-watermark {
  color: rgba(255, 255, 255, 0.08);
  transform: scale(1.05);
}

/* 维度图标圆：微光环绕 */
.philo-icon-wrap {
  width: 54px; height: 54px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 1.35rem;
  color: #ffffff;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.philo-card:hover .philo-icon-wrap {
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.25);
  transform: scale(1.08);
}

.philo-title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
  color: #ffffff;
}

.philo-english {
  font-family: var(--font-en-serif);
  font-size: 0.72rem;
  letter-spacing: 0.25em;
  color: #94a3b8;
  text-transform: uppercase;
  margin-bottom: 16px;
  display: block;
}

.philo-text {
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.8;
  font-weight: 300;
}


/* --------------------------------------------------------------------------
   6. 息道调心 · 互动减压舱 (Interactive Breath Guide)
   竹青生命清泉大光池背景，通透澄澈
   -------------------------------------------------------------------------- */
.section-breath {
  padding: var(--section-padding) 0;
  position: relative;
  /* 注入大面积竹青与天青生命光晕，打破纯黑 */
  background: 
    radial-gradient(ellipse at 70% 50%, rgba(67, 140, 107, 0.22) 0%, rgba(30, 44, 58, 0.55) 45%, transparent 75%),
    radial-gradient(circle at 20% 70%, rgba(125, 96, 146, 0.12) 0%, transparent 50%),
    linear-gradient(180deg, transparent 0%, rgba(18, 25, 34, 0.75) 50%, transparent 100%);
}

.breath-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: center;
}

.breath-info {
  display: flex;
  flex-direction: column;
}

/* 呼吸模式切换按钮组 */
.breath-modes {
  display: flex;
  gap: 12px;
  margin: 32px 0 24px;
  flex-wrap: wrap;
}

.breath-mode-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 10px 18px;
  color: var(--text-secondary);
  font-size: 0.88rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: inherit;
}

.breath-mode-btn:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

.breath-mode-btn.active {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--text-primary);
  color: var(--text-primary);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
}

/* 实时呼吸指引信息卡 */
.breath-instruction {
  background: var(--bg-card);
  border-left: 2px solid var(--color-bamboo);
  padding: 16px 20px;
  border-radius: 0 6px 6px 0;
  margin-top: 10px;
}

.breath-instruction-phase {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: 0.1em;
}

.breath-instruction-tips {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 呼吸调息球体动画组件 */
.breath-visual-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  position: relative;
}

/* ==========================================================================
   人类呼吸系统动态示意图组件 (Human Respiratory System Stage)
   解剖结构：鼻道、口腔、气管、肺叶(膨胀/收缩)、横膈膜(升降/气沉丹田)、O2/CO2气流
   ========================================================================== */
.breath-visual-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 480px;
  position: relative;
}

.breath-anatomy-stage {
  width: 100%;
  max-width: 380px;
  background: rgba(18, 20, 23, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 24px 20px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  box-shadow: 
    0 24px 50px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: border-color 0.8s ease, box-shadow 0.8s ease;
}

/* 顶部状态印章徽标 */
.breath-stage-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  margin-bottom: 8px;
  transition: all 0.6s ease;
}

.breath-stage-badge .badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-ink-white);
  transition: background-color 0.6s ease, box-shadow 0.6s ease;
}

.breath-stage-badge .badge-text {
  font-family: var(--font-serif);
  font-size: 0.92rem;
  letter-spacing: 0.12em;
  color: var(--text-primary);
  font-weight: 600;
}

/* SVG 画布包装器 */
.breath-svg-box {
  width: 100%;
  max-width: 340px;
  height: 380px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.breath-anatomy-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

/* 1. 人体实心剪影基础 (参考图的高质感剪影) */
.human-silhouette-group {
  transition: all 0.8s ease;
}

.silhouette-body-path {
  fill: url(#silhouette-grad);
  stroke: rgba(255, 255, 255, 0.22);
  stroke-width: 1.5;
  stroke-linejoin: round;
}

.silhouette-edge-highlight {
  fill: none;
  stroke: rgba(255, 255, 255, 0.45);
  stroke-width: 1.8;
  stroke-linecap: round;
  filter: drop-shadow(0 0 3px rgba(255, 255, 255, 0.25));
}

/* 2. 内部解剖气道剖面 (参考图 4、6 的镂空气道设计) */
.cavity-nasal-shape,
.cavity-oral-shape,
.cavity-trachea-shape {
  fill: url(#cavity-base-grad);
  stroke: #ffffff;
  stroke-width: 1.6;
  stroke-linejoin: round;
  transition: fill 2.5s ease, stroke 2.5s ease, filter 2.5s ease;
}

.trachea-rings-white line {
  stroke: rgba(15, 23, 42, 0.45);
  stroke-width: 1.6;
  stroke-linecap: round;
}

.bronchus-tree-line {
  fill: none;
  stroke: #ffffff;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 2.5s ease;
}

/* 气道内部解剖气流点阵 (参考图核心元素：气道内密布微粒点阵) */
.cavity-internal-dots circle {
  fill: #0f172a;
  opacity: 0.85;
  transition: fill 2s ease, opacity 2s ease, transform 2s ease;
}

/* 3. 左右肺叶在胸腔剪影内开合 */
.lung-lobe {
  will-change: transform;
  transition: transform 4.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.lung-right {
  transform-origin: 174px 248px;
}

.lung-left {
  transform-origin: 186px 248px;
}

.lung-path {
  fill: url(#lung-grad-normal);
  stroke: rgba(255, 255, 255, 0.35);
  stroke-width: 1.5;
  transition: fill 3s ease, stroke 3s ease, filter 3s ease;
}

.alveoli-dot {
  fill: #ffffff;
  opacity: 0.45;
  transition: fill 2s ease, opacity 2s ease;
}

/* 4. 横膈膜肌群 */
.diaphragm-muscle {
  fill: rgba(255, 255, 255, 0.08);
  stroke: rgba(255, 255, 255, 0.25);
  stroke-width: 1.5;
  transition: transform 4.5s cubic-bezier(0.22, 1, 0.36, 1), fill 3s ease, stroke 3s ease;
  will-change: transform;
  transform-origin: 180px 386px;
}

.diaphragm-label {
  font-family: var(--font-serif);
  font-size: 10px;
  letter-spacing: 0.12em;
  fill: rgba(255, 255, 255, 0.4);
}

/* 升降指示箭头 (参考图的 3 个方向箭头) */
.diaphragm-arrows .arrow-path {
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.arrows-down, .arrows-up {
  transition: opacity 0.8s ease;
}

.arrows-down {
  opacity: 0;
  stroke: #6ee7b7;
}

.arrows-up {
  opacity: 0;
  stroke: #c4b5fd;
}

/* 丹田玄关 */
.dantian-glow-core {
  fill: rgba(255, 255, 255, 0.2);
  transition: fill 3s ease, transform 3s ease;
}

.dantian-glow-ring {
  fill: none;
  stroke: rgba(255, 255, 255, 0.15);
  stroke-width: 1;
  stroke-dasharray: 3 3;
  transition: stroke 3s ease;
}

.dantian-text {
  font-family: var(--font-serif);
  font-size: 8.5px;
  fill: rgba(255, 255, 255, 0.55);
}

/* 5. 口鼻外侧点阵微粒喷流 (参考图的标志性圆点喷流特效) */
.external-particle-jets {
  pointer-events: none;
}

.particle-swarm {
  transition: opacity 0.8s ease;
}

.particle-swarm .p-dot {
  transition: fill 0.6s ease, transform 0.6s ease;
}

/* 吸气微粒群动效 (参考图 1、4、6：向鼻孔聚拢吸入) */
.swarm-inhale {
  opacity: 0;
}

.swarm-inhale .p-dot {
  fill: #6ee7b7;
  filter: drop-shadow(0 0 4px rgba(110, 231, 183, 0.8));
}

@keyframes inhaleConeStream {
  0% {
    transform: translate(0, 0);
    opacity: 0.3;
  }
  50% {
    opacity: 1;
  }
  100% {
    transform: translate(12px, 8px);
    opacity: 0.1;
  }
}

/* 呼气微粒群动效 (参考图 3、5、8：由口唇向外放射喷散) */
.swarm-exhale {
  opacity: 0;
}

.swarm-exhale .p-dot {
  fill: #c4b5fd;
  filter: drop-shadow(0 0 4px rgba(196, 181, 253, 0.8));
}

@keyframes exhalePlumeStream {
  0% {
    transform: translate(0, 0);
    opacity: 0.9;
  }
  50% {
    opacity: 0.8;
  }
  100% {
    transform: translate(-18px, 6px);
    opacity: 0.1;
  }
}

/* 6. 气体标识徽记 (O2 与 CO2) */
.gas-bubble {
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.gas-circle {
  transition: fill 0.8s ease, stroke 0.8s ease, filter 0.8s ease;
}

.o2-circle {
  fill: rgba(62, 123, 94, 0.25);
  stroke: rgba(110, 231, 183, 0.7);
  stroke-width: 1.5;
}

.co2-circle {
  fill: rgba(108, 84, 126, 0.25);
  stroke: rgba(196, 181, 253, 0.7);
  stroke-width: 1.5;
}

.gas-title {
  font-family: var(--font-serif);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  fill: var(--text-primary);
  font-weight: 600;
}

.gas-sub {
  font-family: var(--font-sans);
  font-size: 8px;
  fill: var(--text-secondary);
  font-weight: 700;
}

/* 实时生理与气机指示指标 */
.breath-anatomy-metrics {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  margin-top: 6px;
}

.metric-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.metric-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.metric-value {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: var(--text-primary);
  font-weight: 600;
  transition: color 0.6s ease;
}

.metric-divider {
  width: 1px;
  height: 24px;
  background: rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
   四相呼吸阶段动态类 (由 breath-guide.js 驱动 stageEl)
   ========================================================================== */

/* ── 1. 吸气阶段 (Inhale) ── */
.breath-anatomy-stage.inhale {
  border-color: rgba(62, 123, 94, 0.4);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6), 0 0 35px rgba(62, 123, 94, 0.2);
}

.breath-anatomy-stage.inhale .breath-stage-badge {
  background: rgba(62, 123, 94, 0.2);
  border-color: rgba(110, 231, 183, 0.4);
}

.breath-anatomy-stage.inhale .badge-dot {
  background: #6ee7b7;
  box-shadow: 0 0 8px #6ee7b7;
}

.breath-anatomy-stage.inhale .cavity-nasal-shape,
.breath-anatomy-stage.inhale .cavity-trachea-shape {
  fill: url(#lung-grad-inhale);
  stroke: #6ee7b7;
  filter: drop-shadow(0 0 8px rgba(110, 231, 183, 0.4));
}

.breath-anatomy-stage.inhale .cavity-internal-dots circle {
  fill: #064e3b;
  opacity: 0.95;
}

.breath-anatomy-stage.inhale .lung-right {
  transform: scale(1.18) translate(-6px, 2px);
}

.breath-anatomy-stage.inhale .lung-left {
  transform: scale(1.18) translate(6px, 2px);
}

.breath-anatomy-stage.inhale .lung-path {
  fill: url(#lung-grad-inhale);
  stroke: #6ee7b7;
  filter: drop-shadow(0 0 12px rgba(16, 185, 129, 0.45));
}

.breath-anatomy-stage.inhale .alveoli-dot {
  fill: #a7f3d0;
  opacity: 0.9;
}

.breath-anatomy-stage.inhale .diaphragm-muscle {
  transform: translateY(14px) scaleY(0.72);
  stroke: #6ee7b7;
  fill: rgba(16, 185, 129, 0.28);
}

.breath-anatomy-stage.inhale .arrows-down {
  opacity: 1;
  animation: arrowsDownPulse 1.2s infinite;
}

.breath-anatomy-stage.inhale .swarm-inhale {
  opacity: 1;
  animation: inhaleConeStream 1.2s ease-in-out infinite;
}

.breath-anatomy-stage.inhale .swarm-exhale {
  opacity: 0;
}

.breath-anatomy-stage.inhale .bubble-o2 {
  opacity: 1;
  transform: translate(42px, 60px) scale(1.08);
}

.breath-anatomy-stage.inhale .bubble-co2 {
  opacity: 0.25;
  transform: translate(36px, 175px) scale(0.85);
}

.breath-anatomy-stage.inhale .dantian-glow-core {
  fill: #e88d38;
  transform: scale(1.3);
}

.breath-anatomy-stage.inhale .dantian-glow-ring {
  stroke: rgba(232, 141, 56, 0.6);
}

/* ── 2. 屏息阶段 (Hold) ── */
.breath-anatomy-stage.hold {
  border-color: rgba(185, 58, 43, 0.35);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6), 0 0 35px rgba(185, 58, 43, 0.15);
}

.breath-anatomy-stage.hold .breath-stage-badge {
  background: rgba(185, 58, 43, 0.2);
  border-color: rgba(240, 110, 95, 0.4);
}

.breath-anatomy-stage.hold .badge-dot {
  background: #f06e5f;
  box-shadow: 0 0 8px #f06e5f;
}

.breath-anatomy-stage.hold .cavity-nasal-shape,
.breath-anatomy-stage.hold .cavity-trachea-shape {
  fill: url(#lung-grad-inhale);
  stroke: #a7f3d0;
  filter: drop-shadow(0 0 10px rgba(110, 231, 183, 0.6));
}

.breath-anatomy-stage.hold .lung-right {
  transform: scale(1.18) translate(-6px, 2px);
}

.breath-anatomy-stage.hold .lung-left {
  transform: scale(1.18) translate(6px, 2px);
}

.breath-anatomy-stage.hold .lung-path {
  fill: url(#lung-grad-inhale);
  stroke: #a7f3d0;
  filter: drop-shadow(0 0 14px rgba(16, 185, 129, 0.5));
}

.breath-anatomy-stage.hold .diaphragm-muscle {
  transform: translateY(14px) scaleY(0.72);
  stroke: #6ee7b7;
  fill: rgba(16, 185, 129, 0.28);
}

.breath-anatomy-stage.hold .swarm-inhale {
  opacity: 0.6;
}

.breath-anatomy-stage.hold .bubble-o2 {
  opacity: 0.9;
  transform: translate(42px, 60px) scale(1);
}

.breath-anatomy-stage.hold .bubble-co2 {
  opacity: 0.25;
}

.breath-anatomy-stage.hold .dantian-glow-core {
  fill: #b93a2b;
  transform: scale(1.4);
}

/* ── 3. 呼气阶段 (Exhale) ── */
.breath-anatomy-stage.exhale {
  border-color: rgba(108, 84, 126, 0.4);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6), 0 0 35px rgba(108, 84, 126, 0.2);
}

.breath-anatomy-stage.exhale .breath-stage-badge {
  background: rgba(108, 84, 126, 0.25);
  border-color: rgba(196, 181, 253, 0.4);
}

.breath-anatomy-stage.exhale .badge-dot {
  background: #c4b5fd;
  box-shadow: 0 0 8px #c4b5fd;
}

.breath-anatomy-stage.exhale .cavity-oral-shape,
.breath-anatomy-stage.exhale .cavity-trachea-shape {
  fill: url(#lung-grad-exhale);
  stroke: #c4b5fd;
  filter: drop-shadow(0 0 8px rgba(196, 181, 253, 0.4));
}

.breath-anatomy-stage.exhale .cavity-internal-dots circle {
  fill: #3b0764;
  opacity: 0.95;
}

.breath-anatomy-stage.exhale .lung-right {
  transform: scale(0.85) translate(4px, -2px);
}

.breath-anatomy-stage.exhale .lung-left {
  transform: scale(0.85) translate(-4px, -2px);
}

.breath-anatomy-stage.exhale .lung-path {
  fill: url(#lung-grad-exhale);
  stroke: #c4b5fd;
  filter: drop-shadow(0 0 10px rgba(139, 92, 246, 0.4));
}

.breath-anatomy-stage.exhale .alveoli-dot {
  fill: #ddd6fe;
  opacity: 0.6;
}

.breath-anatomy-stage.exhale .diaphragm-muscle {
  transform: translateY(-12px) scaleY(1.35);
  stroke: #c4b5fd;
  fill: rgba(139, 92, 246, 0.25);
}

.breath-anatomy-stage.exhale .arrows-up {
  opacity: 1;
  animation: arrowsUpPulse 1.2s infinite;
}

.breath-anatomy-stage.exhale .swarm-exhale {
  opacity: 1;
  animation: exhalePlumeStream 1.3s ease-out infinite;
}

.breath-anatomy-stage.exhale .swarm-inhale {
  opacity: 0;
}

.breath-anatomy-stage.exhale .bubble-co2 {
  opacity: 1;
  transform: translate(36px, 175px) scale(1.08);
}

.breath-anatomy-stage.exhale .bubble-o2 {
  opacity: 0.25;
  transform: translate(42px, 60px) scale(0.85);
}

.breath-anatomy-stage.exhale .dantian-glow-core {
  fill: rgba(255, 255, 255, 0.25);
  transform: scale(0.9);
}

/* ── 4. 归元阶段 (Rest) ── */
.breath-anatomy-stage.rest {
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
}

.breath-anatomy-stage.rest .breath-stage-badge {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

.breath-anatomy-stage.rest .badge-dot {
  background: var(--text-primary);
}

.breath-anatomy-stage.rest .cavity-nasal-shape,
.breath-anatomy-stage.rest .cavity-oral-shape,
.breath-anatomy-stage.rest .cavity-trachea-shape {
  fill: url(#cavity-base-grad);
  stroke: #ffffff;
}

.breath-anatomy-stage.rest .lung-right,
.breath-anatomy-stage.rest .lung-left {
  transform: scale(1.0);
}

.breath-anatomy-stage.rest .lung-path {
  fill: url(#lung-grad-normal);
  stroke: rgba(255, 255, 255, 0.35);
}

.breath-anatomy-stage.rest .diaphragm-muscle {
  transform: translateY(0) scaleY(1);
  stroke: rgba(255, 255, 255, 0.3);
  fill: rgba(255, 255, 255, 0.08);
}

.breath-anatomy-stage.rest .bubble-o2,
.breath-anatomy-stage.rest .bubble-co2 {
  opacity: 0.45;
  transform: scale(0.95);
}

.breath-anatomy-stage.rest .swarm-inhale,
.breath-anatomy-stage.rest .swarm-exhale {
  opacity: 0;
}

.breath-anatomy-stage.rest .breath-stage-badge {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

.breath-anatomy-stage.rest .badge-dot {
  background: var(--text-primary);
}

.breath-anatomy-stage.rest .lung-right,
.breath-anatomy-stage.rest .lung-left {
  transform: scale(1.0);
}

.breath-anatomy-stage.rest .lung-path {
  fill: url(#lung-grad-normal);
  stroke: rgba(255, 255, 255, 0.3);
}

.breath-anatomy-stage.rest .diaphragm-muscle {
  transform: translateY(0) scaleY(1);
  stroke: rgba(255, 255, 255, 0.3);
  fill: rgba(255, 255, 255, 0.08);
}

.breath-anatomy-stage.rest .bubble-o2,
.breath-anatomy-stage.rest .bubble-co2 {
  opacity: 0.45;
  transform: scale(0.95);
}

/* ── 呼吸流向关键帧动画 ── */
@keyframes flowInhaleDash {
  from { stroke-dashoffset: 28; }
  to   { stroke-dashoffset: 0; }
}

@keyframes flowExhaleDash {
  from { stroke-dashoffset: 0; }
  to   { stroke-dashoffset: 28; }
}

@keyframes arrowsDownPulse {
  0%   { transform: translateY(0);    opacity: 0.3; }
  50%  { transform: translateY(4px);  opacity: 1; }
  100% { transform: translateY(0);    opacity: 0.3; }
}

@keyframes arrowsUpPulse {
  0%   { transform: translateY(0);    opacity: 0.3; }
  50%  { transform: translateY(-4px); opacity: 1; }
  100% { transform: translateY(0);    opacity: 0.3; }
}

/* 呼吸计数 */
.breath-timer {
  margin-top: 28px;
  font-family: var(--font-en-serif);
  font-size: 1.5rem;
  letter-spacing: 0.2em;
  color: var(--text-secondary);
}


/* --------------------------------------------------------------------------
   7. 研习课程与工坊 (Curated Courses & Workshops)
   各课程专属水墨光环，告别单调暗色
   -------------------------------------------------------------------------- */
.section-courses {
  padding: var(--section-padding) 0;
  position: relative;
  background: radial-gradient(ellipse at 50% 30%, rgba(45, 62, 88, 0.45) 0%, rgba(12, 16, 22, 0) 72%);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

/* 课程卡片：通透白玉玻璃拟态 + 主题色立体微光 */
.course-card {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%), rgba(22, 29, 40, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 14px;
  overflow: hidden;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: 
    0 16px 40px rgba(0, 0, 0, 0.45),
    inset 0 1px 1px rgba(255, 255, 255, 0.25);
  transition: transform 0.5s var(--ease-smooth),
              border-color 0.5s ease,
              box-shadow 0.5s ease;
  will-change: transform;
}

/* 第一门课：竹青主题光 */
.course-card:nth-child(1) {
  border-color: rgba(67, 140, 107, 0.32);
}
.course-card:nth-child(1):hover {
  border-color: rgba(110, 231, 183, 0.6);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6), 0 0 35px rgba(67, 140, 107, 0.3);
}

/* 第二门课：朱砂主题光 */
.course-card:nth-child(2) {
  border-color: rgba(199, 67, 50, 0.32);
}
.course-card:nth-child(2):hover {
  border-color: rgba(248, 113, 113, 0.6);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6), 0 0 35px rgba(199, 67, 50, 0.3);
}

/* 第三门课：石英紫主题光 */
.course-card:nth-child(3) {
  border-color: rgba(125, 96, 146, 0.32);
}
.course-card:nth-child(3):hover {
  border-color: rgba(192, 132, 252, 0.6);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6), 0 0 35px rgba(125, 96, 146, 0.3);
}

.course-card:hover {
  transform: translateY(-8px);
}

/* 课程视觉区域：带有明亮水墨雾化光晕 */
.course-visual {
  height: 210px;
  position: relative;
  background: #18202c;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.course-card:nth-child(1) .course-visual {
  background: radial-gradient(circle at 50% 50%, rgba(67, 140, 107, 0.25) 0%, #151e28 75%);
}
.course-card:nth-child(2) .course-visual {
  background: radial-gradient(circle at 50% 50%, rgba(199, 67, 50, 0.25) 0%, #1a1b24 75%);
}
.course-card:nth-child(3) .course-visual {
  background: radial-gradient(circle at 50% 50%, rgba(125, 96, 146, 0.28) 0%, #181926 75%);
}

/* 课程标签 */
.course-tag {
  position: absolute;
  top: 16px; left: 16px;
  padding: 5px 14px;
  border-radius: 4px;
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  font-weight: 600;
  z-index: 2;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.tag-bamboo {
  background: rgba(67, 140, 107, 0.28);
  color: #a7f3d0;
  border: 1px solid rgba(110, 231, 183, 0.5);
}

.tag-vermilion {
  background: rgba(199, 67, 50, 0.28);
  color: #fecaca;
  border: 1px solid rgba(248, 113, 113, 0.5);
}

.tag-purple {
  background: rgba(125, 96, 146, 0.28);
  color: #e9d5ff;
  border: 1px solid rgba(192, 132, 252, 0.5);
}

/* 大字装饰：高对比立体水墨印记 */
.course-chinese-symbol {
  font-family: var(--font-serif);
  font-size: 5.2rem;
  color: rgba(255, 255, 255, 0.14);
  font-weight: 700;
  user-select: none;
  z-index: 1;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.15);
  transition: transform 0.5s ease, color 0.5s ease;
}

.course-card:hover .course-chinese-symbol {
  transform: scale(1.12);
  color: rgba(255, 255, 255, 0.25);
}

/* 课程正文区 */
.course-body {
  padding: 30px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.course-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.82rem;
  color: #94a3b8;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.course-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  line-height: 1.4;
  margin-bottom: 12px;
  color: #ffffff;
}

.course-desc {
  font-size: 0.94rem;
  color: #cbd5e1;
  line-height: 1.85;
  font-weight: 300;
  margin-bottom: 24px;
  flex: 1;
}

.course-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.course-btn {
  background: none;
  border: none;
  color: #f8f7f2;
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: gap 0.3s ease, color 0.3s ease;
  font-family: inherit;
  font-weight: 500;
}

.course-btn:hover {
  gap: 12px;
  color: #f87171;
}


/* --------------------------------------------------------------------------
   8. 名师与正宗道脉传承 (Lineage & Masters)
   水墨月华光轮（Moon Halo）衬托宗师剪影
   -------------------------------------------------------------------------- */
.section-masters {
  padding: var(--section-padding) 0;
  position: relative;
  /* 右侧注入东方月影水墨光池 */
  background: radial-gradient(circle at 75% 50%, rgba(240, 230, 215, 0.14) 0%, rgba(45, 60, 84, 0.35) 45%, transparent 75%);
}

.lineage-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 80px);
  align-items: center;
}

.lineage-image-container {
  position: relative;
}

/* 宗师镜框：水墨明月高悬光晕 */
.lineage-frame {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.2);
  /* 浑圆月华光轮背景 */
  background: 
    radial-gradient(circle at 50% 46%, rgba(255, 250, 235, 0.22) 0%, rgba(199, 67, 50, 0.1) 48%, rgba(18, 25, 36, 0.95) 75%);
  aspect-ratio: 4 / 5;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 
    0 24px 60px rgba(0, 0, 0, 0.65),
    0 0 45px rgba(255, 255, 255, 0.08),
    inset 0 1px 2px rgba(255, 255, 255, 0.3);
}

.lineage-frame svg {
  width: 82%;
  height: 82%;
  opacity: 0.92;
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.6));
}

/* 朱砂道正印章 */
.lineage-seal {
  position: absolute;
  bottom: 24px; right: 24px;
  width: 68px; height: 68px;
  border: 2px solid var(--color-vermilion);
  color: var(--color-vermilion);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.1em;
  background: rgba(18, 24, 34, 0.88);
  backdrop-filter: blur(10px);
  border-radius: 6px;
  box-shadow: 0 0 20px rgba(199, 67, 50, 0.4);
}

/* 传承要点 */
.lineage-points {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 32px;
}

.lineage-point-item {
  display: flex;
  gap: 20px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  transition: background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.lineage-point-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateX(6px);
}

.point-num {
  font-family: var(--font-en-serif);
  font-size: 1.35rem;
  color: #f87171;
  font-weight: 600;
  flex-shrink: 0;
  text-shadow: 0 0 10px rgba(248, 113, 113, 0.4);
}

.point-text h4 {
  font-family: var(--font-serif);
  font-size: 1.18rem;
  letter-spacing: 0.1em;
  margin-bottom: 6px;
  color: #ffffff;
}

.point-text p {
  color: #cbd5e1;
  font-size: 0.92rem;
  line-height: 1.8;
  font-weight: 300;
}


/* --------------------------------------------------------------------------
   9. 学员心声与身心转化 (Testimonials & Impact)
   紫霞星雾背景，通透白玉卡片
   -------------------------------------------------------------------------- */
.section-testimonials {
  padding: var(--section-padding) 0;
  position: relative;
  background: radial-gradient(ellipse at 50% 50%, rgba(125, 96, 146, 0.2) 0%, rgba(12, 16, 22, 0) 70%);
}

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

.testi-card {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%), rgba(24, 31, 42, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 12px;
  padding: 38px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 
    0 16px 36px rgba(0, 0, 0, 0.45),
    inset 0 1px 1px rgba(255, 255, 255, 0.2);
  transition: transform 0.4s ease,
              border-color 0.4s ease,
              box-shadow 0.4s ease;
  will-change: transform;
}

.testi-card:hover {
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-6px);
  box-shadow: 
    0 24px 50px rgba(0, 0, 0, 0.6),
    0 0 25px rgba(125, 96, 146, 0.25);
}

.testi-quote {
  font-size: 1.02rem;
  line-height: 1.95;
  color: #f1f5f9;
  font-family: var(--font-serif);
  font-weight: 400;
  margin-bottom: 24px;
  position: relative;
  font-style: normal;
}

/* 引号装饰 */
.testi-quote::before {
  content: "\201C";
  font-size: 3rem;
  color: rgba(255, 255, 255, 0.22);
  position: absolute;
  top: -26px; left: -14px;
  line-height: 1;
}

.testi-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-avatar {
  width: 46px; height: 46px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: #ffffff;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.15);
  flex-shrink: 0;
}

.author-info h5 {
  font-size: 0.98rem;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: #ffffff;
}

.author-info span {
  font-size: 0.8rem;
  color: #94a3b8;
}


/* --------------------------------------------------------------------------
   10. 预约体验与号召 (CTA Section)
   晨曦破晓霞光大光箱
   -------------------------------------------------------------------------- */
.section-cta {
  padding: var(--section-padding) 0;
  text-align: center;
  position: relative;
}

.cta-box {
  /* 破晓朱砂与金石流光渐变 */
  background: 
    radial-gradient(ellipse at 50% 0%, rgba(199, 67, 50, 0.38) 0%, rgba(35, 50, 72, 0.85) 55%, rgba(16, 22, 32, 0.98) 100%);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 20px;
  padding: clamp(60px, 9vw, 100px) clamp(24px, 5vw, 60px);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(20px);
  box-shadow: 
    0 30px 80px rgba(0, 0, 0, 0.7),
    0 0 70px rgba(199, 67, 50, 0.22),
    inset 0 1px 2px rgba(255, 255, 255, 0.35);
}

.cta-title {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  font-weight: 500;
  letter-spacing: 0.16em;
  margin-bottom: 20px;
  /* 金石高光渐变字 */
  background: linear-gradient(180deg, #ffffff 0%, #fef2f2 60%, #fecaca 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.8));
}

.cta-desc {
  font-size: 1.08rem;
  color: #e2e8f0;
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.95;
  font-weight: 300;
}


/* --------------------------------------------------------------------------
   11. 极简页脚 (Footer - 东方留白与天水一色)
   -------------------------------------------------------------------------- */
.site-footer {
  padding: 90px 0 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  position: relative;
  background: linear-gradient(180deg, rgba(16, 22, 31, 0.95) 0%, #090c10 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-intro p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.9;
  margin-top: 18px;
  max-width: 320px;
  font-weight: 300;
}

.footer-col h5 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  letter-spacing: 0.05em;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}


/* --------------------------------------------------------------------------
   12. 预约体验模态框 (Booking Modal)
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s var(--ease-smooth);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background: #14171b;
  border: 1px solid var(--border-active);
  border-radius: 10px;
  width: 100%;
  max-width: 520px;
  padding: 40px;
  position: relative;
  transform: translateY(20px) scale(0.97);
  transition: transform 0.4s var(--ease-smooth);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8);
}

.modal-overlay.active .modal-dialog {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 20px; right: 20px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
  transition: color 0.3s ease;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
}

.modal-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 28px;
  line-height: 1.6;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.form-control {
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 12px 16px;
  color: var(--text-primary);
  font-size: 0.92rem;
  font-family: inherit;
  transition: border-color 0.3s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-vermilion);
  background: rgba(255, 255, 255, 0.06);
}

/* select 下拉框适配 */
.form-control option {
  background: #1a1d22;
  color: var(--text-primary);
}


/* --------------------------------------------------------------------------
   13. GSAP 入场动画初始态 (Animation Ready States)
   由 GSAP 在运行时控制元素的 opacity 和 transform
   -------------------------------------------------------------------------- */
.gsap-reveal {
  opacity: 0;
  transform: translateY(30px);
  will-change: transform, opacity;
}


/* --------------------------------------------------------------------------
   14. 响应式布局与断点适配 (Responsive Breakpoints)
   -------------------------------------------------------------------------- */

/* 大平板断点 */
@media (max-width: 1024px) {
  .philosophy-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .courses-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* 手机断点 */
@media (max-width: 768px) {
  /* 导航适配 */
  .nav-menu { display: none; }
  .mobile-toggle { display: block; }
  .zen-audio-toggle .sound-text { display: none; }

  /* 首屏标题缩放与移动端折行自适应 */
  .hero-title {
    font-size: 2.4rem;
    letter-spacing: 0.08em;
    white-space: normal;
  }

  .hero-subtitle-en {
    letter-spacing: 0.2em;
  }

  /* 各栅格单列堆叠 */
  .philosophy-grid,
  .courses-grid,
  .testimonials-grid,
  .breath-container,
  .lineage-wrapper {
    grid-template-columns: 1fr;
  }

  /* 呼吸系统交互台移动端适配 */
  .breath-anatomy-stage {
    max-width: 100%;
    padding: 18px 14px;
  }

  .breath-svg-box {
    height: 330px;
  }

  /* 页脚单列 */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* 超小屏手机 */
@media (max-width: 480px) {
  .hero-title {
    font-size: 2.2rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .cta-title {
    font-size: 1.8rem;
  }
  .hero-actions {
    flex-direction: column;
  }
  .breath-modes {
    flex-direction: column;
  }
  .breath-mode-btn {
    text-align: center;
  }
  .philo-card {
    padding: 30px 22px;
  }
}