```css
/* ==========================================================================
   蘑菇视频 - 蘑菇短视频小站，记录生活每个瞬间
   官网：crbytr.cn
   完整样式表 - 无外部依赖，全部内联
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 全局重置与设计变量
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* 品牌色系 */
  --brand: #2b6e4f;
  --brand-dark: #1f523a;
  --brand-light: #e8f3ed;
  --brand-glow: rgba(43, 110, 79, 0.22);
  --accent: #f5d76e;
  --accent-dark: #d9b94a;
  --accent-glow: rgba(245, 215, 110, 0.35);

  /* 文字色系 */
  --text: #1c2b23;
  --text-secondary: #4a5c52;
  --text-muted: #7a8b81;
  --text-inverse: #ffffff;

  /* 背景色系 */
  --bg: #fbfdfc;
  --bg-alt: #f1f6f3;
  --bg-glass: rgba(251, 253, 252, 0.78);
  --card: #ffffff;
  --card-glass: rgba(255, 255, 255, 0.68);

  /* 边框与分割 */
  --border: #dbe6df;
  --border-light: #eaf2ed;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(30, 60, 45, 0.05);
  --shadow: 0 4px 20px rgba(30, 60, 45, 0.07);
  --shadow-md: 0 8px 28px rgba(30, 60, 45, 0.10);
  --shadow-hover: 0 12px 36px rgba(30, 60, 45, 0.14);
  --shadow-brand: 0 8px 24px rgba(43, 110, 79, 0.28);

  /* 圆角 */
  --radius-xl: 24px;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 8px;
  --radius-pill: 999px;

  /* 布局 */
  --header-h: 68px;
  --container-max: 1200px;
  --container-width: min(1200px, 92%);

  /* 过渡 */
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.45s cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* 渐变 */
  --gradient-brand: linear-gradient(135deg, #2b6e4f 0%, #3d9b6e 100%);
  --gradient-hero: linear-gradient(160deg, #e8f3ed 0%, #fbfdfc 55%, #f5f9f7 100%);
  --gradient-accent: linear-gradient(135deg, #f5d76e 0%, #f0c94a 100%);
  --gradient-card-hover: linear-gradient(135deg, rgba(43, 110, 79, 0.04) 0%, rgba(245, 215, 110, 0.06) 100%);
}

/* 暗色模式变量 */
body.dark {
  --brand: #4aa87a;
  --brand-dark: #2b6e4f;
  --brand-light: #1a2e24;
  --brand-glow: rgba(74, 168, 122, 0.22);
  --accent: #f5d76e;
  --accent-dark: #d9b94a;
  --accent-glow: rgba(245, 215, 110, 0.22);

  --text: #e4ede8;
  --text-secondary: #b8c9c0;
  --text-muted: #8a9e93;
  --text-inverse: #0f1713;

  --bg: #0f1713;
  --bg-alt: #151f1a;
  --bg-glass: rgba(15, 23, 19, 0.82);
  --card: #1a2620;
  --card-glass: rgba(26, 38, 32, 0.72);

  --border: #2a3a31;
  --border-light: #222f28;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.40);
  --shadow-hover: 0 12px 36px rgba(0, 0, 0, 0.50);
  --shadow-brand: 0 8px 24px rgba(74, 168, 122, 0.25);

  --gradient-hero: linear-gradient(160deg, #15251c 0%, #0f1713 55%, #111c16 100%);
  --gradient-card-hover: linear-gradient(135deg, rgba(74, 168, 122, 0.06) 0%, rgba(245, 215, 110, 0.04) 100%);
}

/* --------------------------------------------------------------------------
   2. 基础元素
   -------------------------------------------------------------------------- */
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "WenQuanYi Micro Hei", "Noto Sans SC", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

img,
svg,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--brand);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover {
  color: var(--accent-dark);
}

ul,
ol {
  list-style: none;
}

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

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

::selection {
  background: var(--brand);
  color: #fff;
}

body.dark ::selection {
  background: var(--accent);
  color: var(--text-inverse);
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-alt);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: var(--radius-pill);
  border: 2px solid var(--bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand);
}

/* --------------------------------------------------------------------------
   3. 通用容器与工具类
   -------------------------------------------------------------------------- */
.container {
  width: var(--container-width);
  max-width: var(--container-max);
  margin: 0 auto;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* --------------------------------------------------------------------------
   4. 顶部导航栏（毛玻璃效果）
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition),
    border-color var(--transition);
  height: var(--header-h);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
  border-bottom-color: transparent;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 16px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
  flex-shrink: 0;
  letter-spacing: -0.01em;
  transition: transform var(--transition);
}

.logo:hover {
  transform: scale(1.03);
  color: var(--text);
}

.logo svg {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  box-shadow: 0 4px 12px var(--brand-glow);
  transition: box-shadow var(--transition);
}

.logo:hover svg {
  box-shadow: 0 6px 18px var(--brand-glow);
}

.logo span {
  color: var(--brand);
  transition: color var(--transition);
}

/* 主导航 */
.main-nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.main-nav a {
  position: relative;
  padding: 8px 14px;
  border-radius: var(--radius-xs);
  font-size: 0.94rem;
  color: var(--text-secondary);
  font-weight: 500;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
}

.main-nav a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--brand);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition);
}

.main-nav a:hover {
  background: var(--brand-light);
  color: var(--brand);
}

.main-nav a:hover::after {
  width: 40%;
}

/* 头部操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 搜索框（毛玻璃） */
.search-box {
  display: flex;
  align-items: center;
  background: var(--card-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 0 6px 0 16px;
  height: 40px;
  transition: border-color var(--transition), box-shadow var(--transition),
    background var(--transition);
}

.search-box:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-glow);
  background: var(--card);
}

.search-box input {
  border: none;
  background: transparent;
  outline: none;
  color: var(--text);
  font-size: 0.9rem;
  width: 140px;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-box input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
}

.search-box button {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--brand);
  transition: background var(--transition), transform var(--transition);
}

.search-box button:hover {
  background: var(--brand-light);
  transform: scale(1.08);
}

.search-box button:active {
  transform: scale(0.94);
}

/* 主题切换按钮 */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--text-secondary);
  background: var(--card-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  transition: background var(--transition), color var(--transition),
    transform var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--brand-light);
  color: var(--brand);
  border-color: var(--brand);
  transform: rotate(18deg) scale(1.06);
}

.theme-toggle:active {
  transform: rotate(18deg) scale(0.94);
}

/* 移动菜单按钮 */
.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-xs);
  place-items: center;
  color: var(--text);
  background: var(--card-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  transition: background var(--transition), transform var(--transition);
}

.menu-toggle:hover {
  background: var(--brand-light);
  color: var(--brand);
}

.menu-toggle:active {
  transform: scale(0.94);
}

/* --------------------------------------------------------------------------
   5. 移动端导航（毛玻璃）
   -------------------------------------------------------------------------- */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  padding: 16px 4%;
  z-index: 999;
  flex-direction: column;
  gap: 4px;
  box-shadow: var(--shadow-md);
  max-height: calc(100vh - var(--header-h));
  overflow-y: auto;
  animation: slideDown 0.3s var(--ease-bounce);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav a {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-weight: 500;
  transition: background var(--transition), color var(--transition),
    padding-left var(--transition);
}

.mobile-nav a:hover,
.mobile-nav a:active {
  background: var(--brand-light);
  color: var(--brand);
  padding-left: 22px;
}

/* --------------------------------------------------------------------------
   6. 面包屑导航
   -------------------------------------------------------------------------- */
.breadcrumb {
  padding: 16px 0 0;
  font-size: 0.86rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

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

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

.breadcrumb span.sep {
  color: var(--border);
  user-select: none;
}

/* --------------------------------------------------------------------------
   7. Hero 首屏（渐变 Banner）
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 64px 0 72px;
  background: var(--gradient-hero);
}

/* 装饰性光斑 */
.hero::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -120px;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--brand-glow) 0%, transparent 68%);
  pointer-events: none;
  z-index: 0;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -220px;
  left: -140px;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 68%);
  pointer-events: none;
  z-index: 0;
  opacity: 0.7;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

/* Hero 徽章（毛玻璃） */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 7px 18px 7px 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
  animation: fadeInUp 0.6s ease both;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px var(--brand-glow);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: 0 0 0 4px var(--brand-glow);
  }
  50% {
    box-shadow: 0 0 0 8px transparent;
  }
}

/* Hero 标题 */
.hero h1 {
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 22px;
  animation: fadeInUp 0.6s 0.08s ease both;
}

.hero h1 em {
  font-style: normal;
  color: var(--brand);
  position: relative;
  z-index: 1;
  white-space: nowrap;
}

.hero h1 em::after {
  content: "";
  position: absolute;
  left: -2px;
  right: -2px;
  bottom: 4px;
  height: 10px;
  background: var(--accent);
  opacity: 0.5;
  border-radius: 4px;
  z-index: -1;
  transform: scaleX(0);
  transform-origin: left;
  animation: underlineIn 0.7s 0.4s var(--ease-bounce) forwards;
}

@keyframes underlineIn {
  to {
    transform: scaleX(1);
  }
}

.hero p.lead {
  font-size: 1.08rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 30px;
  animation: fadeInUp 0.6s 0.16s ease both;
}

/* Hero 按钮组 */
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 36px;
  animation: fadeInUp 0.6s 0.24s ease both;
}

/* 按钮通用 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.96rem;
  transition: transform var(--transition), box-shadow var(--transition),
    background var(--transition), border-color var(--transition),
    color var(--transition);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn svg {
  transition: transform var(--transition);
}

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

.btn-primary {
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: var(--shadow-brand);
  background-size: 160% 160%;
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(43, 110, 79, 0.38);
  background-position: 100% 50%;
}

.btn-primary:active {
  transform: translateY(-1px);
}

.btn-outline {
  background: var(--card-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--brand);
  color: var(--brand);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  background: var(--card);
}

.btn-outline:active {
  transform: translateY(-1px);
}

/* Hero 数据统计 */
.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s 0.32s ease both;
}

.stat-item {
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -20px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 36px;
  background: var(--border);
}

.stat-item .num {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--brand);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.stat-item .num small {
  font-size: 1rem;
  font-weight: 600;
}

.stat-item .label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Hero 视觉区 */
.hero-visual {
  position: relative;
  animation: fadeInUp 0.7s 0.2s ease both;
}

/* --------------------------------------------------------------------------
   8. 轮播组件
   -------------------------------------------------------------------------- */
.carousel {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
  background: var(--card);
  border: 1px solid var(--border);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.carousel:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 48px rgba(30, 60, 45, 0.18);
}

body.dark .carousel:hover {
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.55);
}

.carousel-track {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.7s ease, visibility 0.7s ease;
  display: grid;
  place-items: center;
  padding: 24px;
}

.slide.active {
  opacity: 1;
  visibility: visible;
}

.slide svg {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-sm);
}

/* 轮播指示点 */
.carousel-dots {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 3;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.carousel-dots button {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
  transition: background var(--transition), transform var(--transition),
    width var(--transition);
}

.carousel-dots button:hover {
  background: rgba(255, 255, 255, 0.85);
}

.carousel-dots button.active {
  background: var(--accent);
  transform: scale(1.25);
  box-shadow: 0 0 8px var(--accent-glow);
}

/* --------------------------------------------------------------------------
   9. 通用区块
   -------------------------------------------------------------------------- */
section {
  padding: 80px 0;
  position: relative;
}

section.alt {
  background: var(--bg-alt);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-head .eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand);
  background: var(--brand-light);
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
  transition: transform var(--transition);
}

.section-head .eyebrow:hover {
  transform: translateY(-2px);
}

.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
  line-height: 1.35;
  color: var(--text);
}

.section-head p {
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.85;
}

/* --------------------------------------------------------------------------
   10. 品牌介绍区
   -------------------------------------------------------------------------- */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 52px;
  align-items: start;
}

.intro-text h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
  position: relative;
  padding-left: 16px;
}

.intro-text h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 4px;
  border-radius: 2px;
  background: var(--gradient-brand);
}

.intro-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.9;
}

.intro-text p:last-child {
  margin-bottom: 0;
}

/* 优势卡片 */
.intro-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.intro-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand);
}

.intro-card h4 {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
}

.intro-card h4 svg {
  color: var(--brand);
  flex-shrink: 0;
}

.intro-list {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.intro-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.75;
  transition: transform var(--transition), color var(--transition);
}

.intro-list li:hover {
  transform: translateX(4px);
  color: var(--text);
}

.intro-list li .tick {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--brand-light);
  color: var(--brand);
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  margin-top: 3px;
  transition: background var(--transition), color var(--transition),
    transform var(--transition);
}

.intro-list li:hover .tick {
  background: var(--brand);
  color: #fff;
  transform: scale(1.1);
}

/* --------------------------------------------------------------------------
   11. 产品优势 / 功能卡片
   -------------------------------------------------------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 26px;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition), background var(--transition);
  position: relative;
  overflow: hidden;
}

/* 顶部渐变条 */
.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
  background: var(--gradient-card-hover), var(--card);
}

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

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: 15px;
  background: var(--brand-light);
  color: var(--brand);
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  transition: background var(--transition), color var(--transition),
    transform var(--transition), box-shadow var(--transition);
}

.feature-card:hover .feature-icon {
  background: var(--gradient-brand);
  color: #fff;
  transform: scale(1.08) rotate(-4deg);
  box-shadow: var(--shadow-brand);
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
  transition: color var(--transition);
}

.feature-card:hover h3 {
  color: var(--brand);
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.85;
}

/* --------------------------------------------------------------------------
   12. 解决方案 / 行业应用
   -------------------------------------------------------------------------- */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 26px;
}

.solution-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.solution-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand);
}

.solution-thumb {
  aspect-ratio: 16 / 9;
  background: var(--brand-light);
  display: grid;
  place-items: center;
  padding: 24px;
  overflow: hidden;
  transition: background var(--transition);
}

.solution-card:hover .solution-thumb {
  background: var(--brand-light);
}

.solution-thumb svg {
  max-height: 100%;
  width: auto;
  transition: transform var(--transition-slow);
}

.solution-card:hover .solution-thumb svg {
  transform: scale(1.06);
}

.solution-body {
  padding: 24px 26px 28px;
}

.solution-body h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
  transition: color var(--transition);
}

.solution-card:hover .solution-body h3 {
  color: var(--brand);
}

.solution-body p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.85;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 0.78rem;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: var(--brand-light);
  color: var(--brand);
  font-weight: 600;
  transition: background var(--transition), color var(--transition),
    transform var(--transition);
}

.tag:hover {
  background: var(--brand);
  color: #fff;
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   13. 客户案例
   -------------------------------------------------------------------------- */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 26px;
}

.case-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.case-card::before {
  content: "\201C";
  position: absolute;
  top: -10px;
  right: 20px;
  font-size: 6rem;
  line-height: 1;
  color: var(--brand-light);
  font-family: Georgia, serif;
  pointer-events: none;
  transition: color var(--transition), transform var(--transition);
}

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand);
}

.case-card:hover::before {
  color: var(--brand);
  opacity: 0.18;
  transform: scale(1.1);
}

.case-quote {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-style: italic;
  line-height: 1.9;
  position: relative;
  z-index: 1;
}

.case-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: auto;
  position: relative;
  z-index: 1;
}

.case-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 1.05rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px var(--brand-glow);
  transition: transform var(--transition);
}

.case-card:hover .case-avatar {
  transform: scale(1.08);
}

.case-meta .name {
  font-weight: 700;
  font-size: 0.94rem;
  color: var(--text);
}

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

/* --------------------------------------------------------------------------
   14. 文章列表
   -------------------------------------------------------------------------- */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 26px;
}

.article-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 13px;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand);
}

.article-card:hover::after {
  transform: scaleX(1);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.article-meta .cat {
  background: var(--brand-light);
  color: var(--brand);
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  transition: background var(--transition), color var(--transition);
}

.article-card:hover .article-meta .cat {
  background: var(--brand);
  color: #fff;
}

.article-card h3 {
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.55;
}

.article-card h3 a {
  color: var(--text);
  transition: color var(--transition);
}

.article-card h3 a:hover {
  color: var(--brand);
}

.article-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex: 1;
  line-height: 1.85;
}

.read-more {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--brand);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition), color var(--transition);
  align-self: flex-start;
}

.read-more:hover {
  gap: 12px;
  color: var(--accent-dark);
}

/* --------------------------------------------------------------------------
   15. FAQ 手风琴
   -------------------------------------------------------------------------- */
.faq-list {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition),
    background var(--transition);
}

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

.faq-item.open {
  border-color: var(--brand);
  box-shadow: var(--shadow-md);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 26px;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  transition: background var(--transition), color var(--transition);
  line-height: 1.6;
}

.faq-question:hover {
  background: var(--bg-alt);
  color: var(--brand);
}

.faq-question .icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--brand-light);
  color: var(--brand);
  display: grid;
  place-items: center;
  transition: transform var(--transition-slow), background var(--transition),
    color var(--transition);
  font-size: 1.1rem;
  line-height: 1;
  font-weight: 400;
}

.faq-item.open .faq-question .icon {
  transform: rotate(45deg);
  background: var(--gradient-brand);
  color: #fff;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1),
    padding var(--transition), opacity var(--transition);
  padding: 0 26px;
  opacity: 0;
}

.faq-item.open .faq-answer {
  max-height: 600px;
  padding: 0 26px 24px;
  opacity: 1;
}

.faq-answer p {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.9;
  padding-top: 4px;
  border-top: 1px dashed var(--border);
  padding-top: 16px;
}

/* --------------------------------------------------------------------------
   16. HowTo 使用教程
   -------------------------------------------------------------------------- */
.howto-wrap {
  max-width: 920px;
  margin: 0 auto;
}

.howto-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.howto-step {
  display: flex;
  gap: 24px;
  padding-bottom: 36px;
  position: relative;
}

.howto-step:last-child {
  padding-bottom: 0;
}

/* 连接线 */
.howto-step::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 48px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--brand), var(--border));
  opacity: 0.35;
}

.howto-step:last-child::before {
  display: none;
}

.step-num {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 1.08rem;
  z-index: 1;
  box-shadow: 0 0 0 6px var(--bg), 0 4px 12px var(--brand-glow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.howto-step:hover .step-num {
  transform: scale(1.1);
  box-shadow: 0 0 0 6px var(--bg), 0 6px 20px var(--brand-glow);
}

.step-body {
  padding-top: 4px;
}

.step-body h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
  transition: color var(--transition);
}

.howto-step:hover .step-body h3 {
  color: var(--brand);
}

.step-body p {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.9;
}

/* --------------------------------------------------------------------------
   17. 新闻中心
   -------------------------------------------------------------------------- */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 920px;
  margin: 0 auto;
}

.news-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 28px;
  padding: 24px 16px;
  border-bottom: 1px solid var(--border);
  border-radius: var(--radius-xs);
  transition: background var(--transition), transform var(--transition),
    padding-left var(--transition);
}

.news-item:first-child {
  border-top: 1px solid var(--border);
}

.news-item:hover {
  background: var(--card);
  transform: translateX(4px);
  padding-left: 22px;
}

.news-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}

.news-body h3 {
  font-size: 1.04rem;
  font-weight: 700;
  margin-bottom: 6px;
  line-height: 1.55;
}

.news-body h3 a {
  color: var(--text);
  transition: color var(--transition);
}

.news-body h3 a:hover {
  color: var(--brand);
}

.news-body p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* --------------------------------------------------------------------------
   18. 联系我们
   -------------------------------------------------------------------------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 26px;
}

.contact-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 26px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

.contact-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--brand);
}

.contact-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--brand-light);
  color: var(--brand);
  display: grid;
  place-items: center;
  margin: 0 auto 18px;
  transition: background var(--transition), color var(--transition),
    transform var(--transition), box-shadow var(--transition);
}

.contact-card:hover .contact-icon {
  background: var(--gradient-brand);
  color: #fff;
  transform: scale(1.1) rotate(-6deg);
  box-shadow: var(--shadow-brand);
}

.contact-card h3 {
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.contact-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  word-break: break-all;
  line-height: 1.8;
}

.contact-card a {
  font-weight: 600;
  color: var(--brand);
  transition: color var(--transition);
}

.contact-card a:hover {
  color: var(--accent-dark);
}

/* --------------------------------------------------------------------------
   19. 页脚
   -------------------------------------------------------------------------- */
.site-footer {
  background: linear-gradient(160deg, #1f523a 0%, #163d2b 100%);
  color: rgba(255, 255, 255, 0.82);
  padding: 64px 0 32px;
  margin-top: 0;
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -100px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74, 168, 122, 0.16) 0%, transparent 68%);
  pointer-events: none;
}

body.dark .site-footer {
  background: linear-gradient(160deg, #12241b 0%, #0d1a13 100%);
}

.footer-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
  gap: 44px;
  margin-bottom: 44px;
}

.footer-brand .logo {
  color: #fff;
  margin-bottom: 18px;
  font-size: 1.2rem;
}

.footer-brand .logo:hover {
  color: #fff;
}

.footer-brand .logo span {
  color: var(--accent);
}

.footer-brand .logo svg {
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.95;
  color: rgba(255, 255, 255, 0.68);
  max-width: 330px;
}

.footer-col h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 11px;
}

.footer-col a {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.68);
  transition: color var(--transition), padding-left var(--transition);
  display: inline-block;
}

.footer-col a:hover {
  color: var(--accent);
  padding-left: 4px;
}

.footer-contact li {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.68);
  display: flex;
  gap: 10px;
  align-items: flex-start;
  line-height: 1.75;
}

.footer-contact li svg {
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--accent);
}

.footer-bottom {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 26px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.55);
}

.footer-bottom-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-bottom-links a {
  color: rgba(255, 255, 255, 0.55);
  transition: color var(--transition);
}

.footer-bottom-links a:hover {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   20. 返回顶部按钮
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #fff;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-brand);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition), visibility var(--transition),
    transform var(--transition), box-shadow var(--transition);
  z-index: 900;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 14px 32px rgba(43, 110, 79, 0.42);
}

.back-to-top:active {
  transform: translateY(-2px) scale(0.98);
}

/* --------------------------------------------------------------------------
   21. 滚动动画
   -------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.75s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.75s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: opacity, transform;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 关键帧动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* --------------------------------------------------------------------------
   22. 响应式布局
   -------------------------------------------------------------------------- */

/* 大屏平板 / 小桌面 */
@media (max-width: 1080px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .hero-visual {
    max-width: 580px;
    margin: 0 auto;
    width: 100%;
  }

  .hero p.lead {
    max-width: 100%;
  }

  .intro-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

/* 平板 */
@media (max-width: 900px) {
  .main-nav {
    display: none;
  }

  .menu-toggle {
    display: grid;
  }

  .search-box {
    display: none;
  }

  section {
    padding: 64px 0;
  }

  .hero {
    padding: 48px 0 56px;
  }

  .section-head {
    margin-bottom: 44px;
  }
}

/* 手机横屏 / 大手机 */
@media (max-width: 640px) {
  :root {
    --header-h: 62px;
  }

  body {
    font-size: 15px;
  }

  section {
    padding: 52px 0;
  }

  .hero {
    padding: 40px 0 48px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-item:not(:last-child)::after {
    right: -12px;
    height: 28px;
  }

  .stat-item .num {
    font-size: 1.55rem;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
    min-width: 140px;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 20px 12px;
  }

  .news-item:hover {
    padding-left: 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-brand p {
    max-width: 100%;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .carousel-dots {
    bottom: 12px;
  }
}

/* 小手机 */
@media (max-width: 480px) {
  :root {
    --header-h: 58px;
  }

  .container {
    width: 94%;
  }

  .logo {
    font-size: 1.1rem;
  }

  .logo svg {
    width: 32px;
    height: 32px;
  }

  .hero h1 {
    font-size: 1.65rem;
  }

  .hero h1 em {
    white-space: normal;
  }

  .hero p.lead {
    font-size: 0.98rem;
  }

  .hero-badge {
    font-size: 0.78rem;
    padding: 6px 14px 6px 10px;
  }

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .btn {
    flex: 1 1 100%;
    padding: 12px 22px;
  }

  .hero-stats {
    gap: 18px;
  }

  .stat-item:not(:last-child)::after {
    display: none;
  }

  .stat-item .num {
    font-size: 1.4rem;
  }

  .stat-item .label {
    font-size: 0.78rem;
  }

  .section-head h2 {
    font-size: 1.4rem;
  }

  .section-head p {
    font-size: 0.94rem;
  }

  .feature-card,
  .solution-body,
  .case-card,
  .article-card,
  .contact-card {
    padding: 24px 20px;
  }

  .faq-question {
    padding: 18px 20px;
    font-size: 0.94rem;
  }

  .faq-answer {
    padding: 0 20px;
  }

  .faq-item.open .faq-answer {
    padding: 0 20px 20px;
  }

  .howto-step {
    gap: 18px;
  }

  .howto-step::before {
    left: 19px;
  }

  .step-num {
    width: 40px;
    height: 40px;
    font-size: 0.98rem;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 46px;
    height: 46px;
  }

  .carousel-track {
    aspect-ratio: 3 / 2.4;
  }

  .slide {
    padding: 16px;
  }
}

/* --------------------------------------------------------------------------
   23. 无障碍与偏好设置
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* 键盘焦点样式 */
:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  .feature-card,
  .solution-card,
  .article-card,
  .case-card,
  .contact-card {
    border-width: 2px;
  }
}

/* 打印样式 */
@media print {
  .site-header,
  .mobile-nav,
  .back-to-top,
  .carousel-dots,
  .hero-actions {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .hero {
    background: none;
    padding: 20px 0;
  }

  section {
    padding: 24px 0;
    page-break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}
```