/**
 * 碳途未来 — 碳中和解决方案企业官网
 * Carbon Neutrality Enterprise Website
 * 蓝绿渐变深色主题 + 毛玻璃卡片 + 未来感设计
 * 纯原生 CSS，无框架依赖
 */

/* ============================================================
   CSS 变量体系 — 碳主题色彩
   ============================================================ */
:root {
  /* 基底色 — 深邃蓝黑 */
  --bg-deep: #060E18;
  --bg-night: #0A1628;
  --bg-card: rgba(255, 255, 255, 0.025);
  --bg-card-hover: rgba(255, 255, 255, 0.05);
  --bg-input: rgba(255, 255, 255, 0.04);

  /* 碳主题色 — 蓝绿渐变 */
  --carbon-blue: #0A4A7A;
  --carbon-teal: #1A8A5A;
  --carbon-green: #00C853;
  --carbon-green-dim: rgba(0, 200, 83, 0.12);
  --carbon-gold: #FFB300;
  --carbon-gradient: linear-gradient(135deg, #0A4A7A 0%, #1A8A5A 100%);
  --carbon-gradient-bright: linear-gradient(135deg, #0D6FB8 0%, #00C853 100%);
  --carbon-gradient-h: linear-gradient(90deg, #0A4A7A, #1A8A5A);

  /* 文字色阶 */
  --text-primary: #E8ECF4;
  --text-secondary: #8892A4;
  --text-muted: #4A5468;

  /* 边框 */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-glow: rgba(26, 138, 90, 0.2);
  --border-carbon: rgba(0, 200, 83, 0.2);

  /* 阴影 */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow-green: 0 0 30px rgba(0, 200, 83, 0.12);
  --shadow-glow-blue: 0 0 30px rgba(10, 74, 122, 0.15);

  /* 圆角 — 大小混用 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* 间距 */
  --section-py: 100px;
  --container-max: 1200px;
  --header-h: 72px;

  /* 过渡 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;

  /* 字体 */
  --font-heading: 'Noto Sans SC', 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'Inter', 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg-deep);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 碳主题深邃渐变背景 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(10, 74, 122, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 75% 25%, rgba(26, 138, 90, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 70% 50% at 50% 80%, rgba(0, 200, 83, 0.03) 0%, transparent 60%),
    linear-gradient(180deg, #060E18 0%, #0A1628 40%, #0D1A2E 100%);
  pointer-events: none;
}

::selection { background: rgba(0, 200, 83, 0.25); color: #fff; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

a { color: inherit; text-decoration: none; transition: color var(--duration-fast) var(--ease-out); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

input, textarea, select, button { font-family: inherit; font-size: inherit; }
input::placeholder, textarea::placeholder { color: var(--text-muted); opacity: 1; }

/* ============================================================
   排版
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.02em;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--carbon-green);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.5rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: 0.03em;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
}

/* ============================================================
   布局容器
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: var(--section-py) 0; }

/* ============================================================
   渐变分割线
   ============================================================ */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,200,83,0.2), var(--carbon-teal), rgba(10,74,122,0.2), transparent);
  border: none;
  margin: 0;
}

/* ============================================================
   Header 头部 — 深色实底
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.header.scrolled {
  background: rgba(10, 22, 40, 0.98);
  box-shadow: 0 1px 30px rgba(0, 0, 0, 0.5);
}

.header__inner {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  margin-right: auto;
}

.header__logo-icon {
  width: 42px;
  height: 42px;
  background: var(--carbon-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: #fff;
}

.header__logo-text { display: flex; flex-direction: column; line-height: 1.2; }

.header__logo-name {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.header__logo-sub {
  font-size: 0.58rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--carbon-green);
}

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

.header__nav-link {
  padding: 8px 16px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.header__nav-link:hover,
.header__nav-link.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

/* 导航下拉 */
.header__nav-item { position: relative; }

.header__nav-item:hover .header__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.header__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 170px;
  padding: 8px 0;
  background: rgba(10, 22, 40, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--duration-normal) var(--ease-out);
  z-index: 60;
}

.header__dropdown a {
  display: block;
  padding: 10px 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}

.header__dropdown a:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

/* Header 右侧操作区 */
.header__actions { display: flex; align-items: center; gap: 8px; margin-left: 20px; }

/* 碳咨询 CTA 按钮 */
.header__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 20px;
  background: var(--carbon-gradient);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.header__cta:hover {
  color: #fff;
  box-shadow: var(--shadow-glow-green);
  transform: translateY(-1px);
}

/* ============================================================
   汉堡菜单（移动端）
   ============================================================ */
.hamburger {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 110;
  margin-left: 8px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all var(--duration-normal) var(--ease-out);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* 移动端侧滑菜单 */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 80%;
  max-width: 360px;
  background: rgba(10, 22, 40, 0.98);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  z-index: 120;
  transform: translateX(-100%);
  transition: transform var(--duration-normal) var(--ease-out);
  overflow-y: auto;
}

.mobile-nav.open { transform: translateX(0); }
.mobile-nav__inner { padding: 24px; padding-top: 80px; }

.mobile-nav__link {
  display: block;
  padding: 14px 16px;
  font-size: 1rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
}

.mobile-nav__link:hover { color: var(--text-primary); background: rgba(255,255,255,0.03); }

.mobile-nav__sub { padding-left: 16px; display: none; }
.mobile-nav__sub.open { display: block; }

.mobile-nav__sub a {
  display: block;
  padding: 10px 16px;
  font-size: 0.9rem;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
}

.mobile-nav__overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 115;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.mobile-nav__overlay.show { opacity: 1; pointer-events: auto; }

/* ============================================================
   内页 Banner
   ============================================================ */
.inner-banner {
  position: relative;
  height: 320px;
  overflow: hidden;
  background: var(--bg-night);
}

.inner-banner__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

.inner-banner__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,22,40,0.7) 0%, rgba(10,22,40,0.5) 50%, var(--bg-deep) 100%);
}

.inner-banner__content {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.inner-banner__title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.inner-banner__subtitle { font-size: 1.05rem; color: var(--text-secondary); }

/* 面包屑 */
.breadcrumb-bar {
  background: var(--bg-night);
  border-bottom: 1px solid var(--border-subtle);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 14px 24px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-secondary); transition: color var(--duration-fast); }
.breadcrumb a:hover { color: var(--carbon-green); }
.breadcrumb i { font-size: 0.65rem; color: var(--text-muted); }

/* ============================================================
   按钮系统
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  white-space: nowrap;
}

.btn--primary {
  background: var(--carbon-gradient);
  color: #fff;
}

.btn--primary:hover {
  box-shadow: var(--shadow-glow-green);
  transform: translateY(-2px);
  color: #fff;
}

.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-glow);
}

.btn--outline:hover {
  border-color: var(--carbon-green);
  background: rgba(0, 200, 83, 0.06);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
}

.btn--white-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
}

.btn--white-outline:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.1);
  color: #fff;
}

.btn--pulse {
  animation: btnPulse 2s infinite;
}

/* ============================================================
   毛玻璃卡片系统
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
  position: relative;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-card), var(--shadow-glow-green);
  transform: translateY(-2px);
}

.card__image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.card:hover .card__image img { transform: scale(1.05); }

.card__body { padding: 20px; }

.card__tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--carbon-green);
  background: var(--carbon-green-dim);
  border-radius: 4px;
  margin-bottom: 8px;
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 渐变边框发光卡片 */
.card-glow-border::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--carbon-blue), var(--carbon-teal), var(--carbon-green), var(--carbon-teal), var(--carbon-blue));
  background-size: 300% 100%;
  z-index: -1;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.card-glow-border:hover::before { opacity: 1; animation: borderGlowRotate 3s linear infinite; }

/* ============================================================
   Hero Banner 首页大屏
   ============================================================ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
}

.hero .swiper {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background:
    linear-gradient(180deg, rgba(10, 22, 40, 0.35) 0%, rgba(10, 22, 40, 0.15) 40%, rgba(10, 22, 40, 0.88) 100%);
}

.hero__content {
  position: relative;
  z-index: 3;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-bottom: 100px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
  text-align: center;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 1rem;
  text-shadow: 0 2px 30px rgba(0,0,0,0.5);
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: rgba(255,255,255,0.75);
  margin-bottom: 2rem;
  font-weight: 300;
}

.hero__actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Hero Swiper 分页器 */
.hero-pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 24px;
}

.hero-pagination .swiper-pagination-bullet {
  width: 40px;
  height: 2px;
  border-radius: 1px;
  background: rgba(255,255,255,0.3);
  opacity: 1;
  transition: all var(--duration-normal);
}

.hero-pagination .swiper-pagination-bullet-active {
  width: 60px;
  background: var(--carbon-green);
  box-shadow: 0 0 10px var(--carbon-green);
}

/* 滚动指示器 */
.hero__scroll-indicator {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.4);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  animation: scrollFloat 2s ease-in-out infinite;
}

.hero__scroll-line {
  width: 1px;
  height: 32px;
  background: linear-gradient(180deg, var(--carbon-green), transparent);
}

@keyframes scrollFloat {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   数据统计 — 碳数字滚动
   ============================================================ */
.stats-section {
  background: rgba(10, 22, 40, 0.5);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}

.stats-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--carbon-green), var(--carbon-teal), transparent);
  opacity: 0.3;
}

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }

.stat-item { text-align: center; }

.stat-item__icon {
  font-size: 1.5rem;
  color: var(--carbon-green);
  margin-bottom: 12px;
  opacity: 0.7;
}

.stat-item__number {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: #fff;
  line-height: 1;
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

.stat-item__number span {
  background: var(--carbon-gradient-bright);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

/* ============================================================
   核心方案 — 四列毛玻璃卡片
   ============================================================ */
.features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  text-align: center;
  padding: 40px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--duration-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: var(--carbon-gradient-h);
  opacity: 0;
  transition: opacity var(--duration-normal);
}

.feature-card:hover {
  border-color: var(--border-carbon);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.feature-card:hover::before { opacity: 1; }

.feature-card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: var(--radius-md);
  background: var(--carbon-green-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--carbon-green);
  transition: all var(--duration-normal) var(--ease-out);
  animation: iconGlow 3s ease-in-out infinite;
}

.feature-card:nth-child(1) .feature-card__icon { color: #00C853; background: rgba(0, 200, 83, 0.12); }
.feature-card:nth-child(2) .feature-card__icon { color: #00D4FF; background: rgba(0, 212, 255, 0.12); animation-delay: 0.5s; }
.feature-card:nth-child(3) .feature-card__icon { color: #FFB300; background: rgba(255, 179, 0, 0.12); animation-delay: 1s; }
.feature-card:nth-child(4) .feature-card__icon { color: #8B5CF6; background: rgba(139, 92, 246, 0.12); animation-delay: 1.5s; }

.feature-card:hover .feature-card__icon {
  transform: scale(1.1);
  box-shadow: var(--shadow-glow-green);
}

.feature-card__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.feature-card__desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

@keyframes iconGlow {
  0%, 100% { box-shadow: 0 0 8px rgba(0, 200, 83, 0.15); }
  50% { box-shadow: 0 0 24px rgba(0, 200, 83, 0.35); }
}

/* ============================================================
   主推方案 — 三列
   ============================================================ */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ============================================================
   碳数据预览
   ============================================================ */
.data-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.data-preview__visual {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  min-height: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.data-preview__visual i {
  font-size: 4rem;
  color: var(--carbon-green);
  opacity: 0.4;
  margin-bottom: 16px;
}

.data-preview__metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.data-preview__metric {
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  text-align: center;
}

.data-preview__metric-value {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--carbon-green);
}

.data-preview__metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============================================================
   案例展示 — 四列图片叠加
   ============================================================ */
.case-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.case-item {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 3/4;
  cursor: pointer;
}

.case-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.case-item:hover img { transform: scale(1.08); }

.case-item__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(transparent 40%, rgba(6, 14, 24, 0.9) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 20px;
}

.case-item__title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 4px;
}

.case-item__reduction {
  font-size: 0.82rem;
  color: var(--carbon-green);
}

/* ============================================================
   实施路径 — 四步骤
   ============================================================ */
.path-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}

.path-step {
  text-align: center;
  padding: 32px 20px;
  position: relative;
}

.path-step__number {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--carbon-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  position: relative;
  z-index: 2;
}

.path-step__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.path-step__desc { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; }

/* 步骤连接线 */
.path-step::after {
  content: '';
  position: absolute;
  top: 60px;
  left: 60%;
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, var(--carbon-teal), var(--carbon-blue));
  z-index: 1;
  opacity: 0.3;
}

.path-step:last-child::after { display: none; }

/* ============================================================
   新闻列表 — 左图右文
   ============================================================ */
.news-list-item {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--duration-normal) var(--ease-out);
  margin-bottom: 16px;
}

.news-list-item:hover {
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
}

.news-list-item__thumb {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 16/10;
  background: var(--bg-input);
}

.news-list-item__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.news-list-item__info { display: flex; flex-direction: column; justify-content: center; }

.news-list-item__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.4;
}

.news-list-item__date {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.news-list-item__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================================
   底部 CTA
   ============================================================ */
.cta-section {
  text-align: center;
  padding: 80px 0 100px;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--carbon-green), rgba(10,74,122,0.5), transparent);
}

.cta-section::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(10, 74, 122, 0.08) 0%, rgba(0, 200, 83, 0.04) 40%, transparent 70%);
  pointer-events: none;
}

.cta-section__title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: 1rem;
  position: relative;
}

/* ============================================================
   列表页 — 网格布局
   ============================================================ */
.list-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.list-header {
  text-align: center;
  margin-bottom: 48px;
}

.list-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 0.5rem;
}

/* 子栏目过滤栏 */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: 36px;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.filter-bar::-webkit-scrollbar { display: none; }

.filter-bar a {
  display: inline-flex;
  padding: 8px 18px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  white-space: nowrap;
  transition: all var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
}

.filter-bar a:hover,
.filter-bar a.active {
  color: var(--carbon-green);
  border-color: var(--carbon-green);
  background: var(--carbon-green-dim);
}

/* ============================================================
   详情页
   ============================================================ */
.detail {
  max-width: 900px;
  margin: 0 auto;
}

.detail-gallery {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 40px;
}

.detail-gallery .swiper-slide { aspect-ratio: 16/9; }
.detail-gallery .swiper-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail__header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
}

.detail__title { font-size: clamp(1.5rem, 3vw, 2.25rem); margin-bottom: 12px; }

.detail__meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.detail__meta-row i { margin-right: 4px; color: var(--carbon-green); }

.detail__params {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 32px;
}

.detail__param {
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  text-align: center;
}

.detail__param-label { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 4px; }
.detail__param-value { font-size: 1rem; font-weight: 600; color: var(--text-primary); }

.detail__body {
  color: var(--text-secondary);
  line-height: 2;
  font-size: 0.95rem;
  letter-spacing: 0.015em;
}

.detail__body img {
  border-radius: var(--radius-md);
  margin: 24px 0;
  max-width: 100%;
}

.detail__body p { margin-bottom: 16px; }

.detail__body h2, .detail__body h3, .detail__body h4 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  margin-top: 32px;
  margin-bottom: 16px;
}

/* 上下篇导航 */
.detail__pager {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-muted);
}

.detail__pager a { color: var(--text-secondary); transition: color var(--duration-fast); }
.detail__pager a:hover { color: var(--carbon-green); }

/* 相关推荐 */
.related-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 56px 0 24px;
  color: var(--text-primary);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* ============================================================
   方案详情 Tab 系统
   ============================================================ */
.solution-tabs {
  margin-top: 40px;
}

.tab-nav {
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 32px;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.tab-nav::-webkit-scrollbar { display: none; }

.tab-nav button {
  padding: 12px 24px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--duration-fast) var(--ease-out);
}

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

.tab-nav button.active {
  color: var(--carbon-green);
  border-bottom-color: var(--carbon-green);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }
.tab-panel.hidden { display: none; }

/* ============================================================
   联系我们 / 咨询页
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info__item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  transition: all var(--duration-fast) var(--ease-out);
}

.contact-info__item:hover { border-color: var(--border-carbon); }

.contact-info__icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--carbon-green-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--carbon-green);
  flex-shrink: 0;
}

.contact-info__label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.contact-info__value { font-size: 0.88rem; color: var(--text-secondary); }

/* 联系表单 */
.contact-form-card {
  padding: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.form-group { margin-bottom: 18px; }

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group label .required { color: #EC4899; }

.form-control {
  width: 100%;
  padding: 13px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all var(--duration-fast) var(--ease-out);
}

.form-control:focus {
  outline: none;
  border-color: var(--carbon-green);
  box-shadow: 0 0 0 3px var(--carbon-green-dim);
}

textarea.form-control { resize: vertical; min-height: 100px; }

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%234A5468' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

/* ============================================================
   搜索页
   ============================================================ */
.search-box { max-width: 700px; margin: 0 auto; }

.search-form-row { display: flex; gap: 10px; }

.search-input-wrap { position: relative; flex: 1; }

.search-input-wrap i {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.95rem;
}

.search-form-row input {
  flex: 1;
  padding: 15px 20px;
  padding-left: 44px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.search-form-row input:focus {
  outline: none;
  border-color: var(--carbon-green);
  box-shadow: 0 0 0 3px var(--carbon-green-dim);
}

.search-result-item {
  display: flex;
  gap: 16px;
  padding: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
  margin-bottom: 10px;
}

.search-result-item:hover {
  border-color: var(--border-carbon);
  background: var(--bg-card-hover);
}

.search-result-item__thumb {
  width: 100px;
  height: 80px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-input);
}

.search-result-item__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.search-result-item__info { flex: 1; min-width: 0; }

.search-result-item__title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-result-item__date { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 4px; }

.search-result-item__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================================
   分页
   ============================================================ */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 4px;
  margin-top: 48px;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
}

.pagination a:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); }
.pagination .active { background: var(--carbon-gradient); color: #fff; font-weight: 600; }
.pagination .disabled { color: var(--text-muted); pointer-events: none; }

/* ============================================================
   空状态
   ============================================================ */
.empty-state {
  text-align: center;
  padding: 60px 20px;
}

.empty-state i {
  font-size: 3rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: block;
  opacity: 0.4;
}

.empty-state p { color: var(--text-muted); font-size: 0.95rem; }

/* ============================================================
   Footer 底部
   ============================================================ */
.footer {
  background: var(--bg-night);
  border-top: 1px solid var(--border-subtle);
}

.footer__top-line {
  height: 2px;
  background: var(--carbon-gradient-h);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding: 60px 0 40px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.footer__brand-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 16px 0;
}

.footer__social { display: flex; gap: 10px; }

.footer__social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.95rem;
  transition: all var(--duration-fast) var(--ease-out);
}

.footer__social a:hover { background: var(--carbon-gradient); color: #fff; }

.footer__col-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.footer__links { display: flex; flex-direction: column; gap: 10px; }

.footer__links a {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color var(--duration-fast);
}

.footer__links a:hover { color: var(--carbon-green); }

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.footer__contact-item i {
  color: var(--carbon-green);
  margin-top: 3px;
  flex-shrink: 0;
}

.footer__qrcode {
  width: 120px;
  height: 120px;
  background: #fff;
  border-radius: var(--radius-sm);
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: #999;
}

.footer__bottom {
  border-top: 1px solid var(--border-subtle);
  padding: 20px 0;
}

.footer__bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 8px;
}

.footer__bottom a { color: var(--text-muted); transition: color var(--duration-fast); }
.footer__bottom a:hover { color: var(--carbon-green); }

/* ============================================================
   友情链接
   ============================================================ */
.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  padding: 16px 0;
}

.friend-links__label {
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.friend-links a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color var(--duration-fast);
}

.friend-links a:hover { color: var(--carbon-green); }

/* ============================================================
   在线客服按钮
   ============================================================ */
.online-service {
  position: fixed;
  right: 20px;
  bottom: 130px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--carbon-gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  cursor: pointer;
  z-index: 80;
  box-shadow: 0 4px 20px rgba(0, 200, 83, 0.3);
  animation: btnPulse 2s infinite;
  transition: all var(--duration-normal) var(--ease-out);
}

.online-service:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 30px rgba(0, 200, 83, 0.5);
}

/* ============================================================
   返回顶部
   ============================================================ */
.back-top {
  position: fixed;
  right: 20px;
  bottom: 80px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  cursor: pointer;
  z-index: 80;
  opacity: 0;
  pointer-events: none;
  transition: all var(--duration-normal) var(--ease-out);
}

.back-top.show { opacity: 1; pointer-events: auto; }

.back-top:hover {
  background: var(--carbon-gradient);
  color: #fff;
  border-color: transparent;
}

/* ============================================================
   动画系统 — 碳主题
   ============================================================ */

/* 渐变流动 */
@keyframes gradientFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes borderGlowRotate {
  0% { background-position: 0% 0%; }
  100% { background-position: 300% 0%; }
}

@keyframes btnPulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 200, 83, 0.4); }
  70% { box-shadow: 0 0 0 12px rgba(0, 200, 83, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 200, 83, 0); }
}

@keyframes shimmer {
  0% { transform: translateX(-100%) skewX(-15deg); }
  100% { transform: translateX(200%) skewX(-15deg); }
}

@keyframes floatUpDown {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes fadeInUp {
  0% { opacity: 0; transform: translateY(30px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* 图片流光扫过 */
.shimmer-overlay { position: relative; overflow: hidden; }

.shimmer-overlay::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.03) 40%,
    rgba(255, 255, 255, 0.06) 50%,
    rgba(255, 255, 255, 0.03) 60%,
    transparent 100%
  );
  transform: translateX(-100%) skewX(-15deg);
  pointer-events: none;
}

.shimmer-overlay:hover::after { animation: shimmer 0.8s ease-in-out; }

/* Hero 入场动画 */
.hero__title { animation: fadeInUp 1s var(--ease-out) both; }
.hero__subtitle { animation: fadeInUp 1s var(--ease-out) 0.2s both; }
.hero__actions { animation: fadeInUp 0.8s var(--ease-out) 0.4s both; }

/* 碳数据呼吸光晕 */
@keyframes dataGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 200, 83, 0.05); }
  50% { box-shadow: 0 0 40px rgba(0, 200, 83, 0.15), 0 0 80px rgba(10, 74, 122, 0.08); }
}

/* AOS 覆盖 */
[data-aos] { transition-timing-function: var(--ease-out); }

/* ============================================================
   结构性工具类 — 从模板内联样式抽离而来
   内联样式优先级高于媒体查询, 抽成类后手机端才能覆盖它们。
   ★ 本段必须位于「响应式断点」之前、且在各组件规则之后,
     与 .container / .btn / .form-control 等同优先级靠后生效。
   ============================================================ */

/* --- 通用 --- */
.c-green { color: var(--carbon-green); }
.btn--lg { font-size: 1rem; padding: 15px 36px; }
.btn--block { width: 100%; justify-content: center; }
.btn--block-lg { width: 100%; justify-content: center; padding: 15px; }

/* --- head.html 导航 --- */
.header__nav-caret { font-size: 0.6rem; margin-left: 4px; }
.mobile-nav__brand { display: flex; align-items: center; gap: 10px; margin-bottom: 24px; }
.mobile-nav__brand-name {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}
.mobile-nav__link--toggle { display: flex; align-items: center; justify-content: space-between; }
.mobile-nav__chevron { font-size: 0.65rem; color: var(--text-muted); }
.mobile-nav__foot { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border-subtle); }

/* --- 区块标题与页脚按钮 --- */
.section--tint { background: rgba(10, 22, 40, 0.3); }
.section-head--center { text-align: center; margin-bottom: 48px; }
.section-subtitle--center { margin: 0 auto; }
.section-bar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 48px;
  flex-wrap: wrap;
  gap: 16px;
}
.section-foot { text-align: center; margin-top: 32px; }
.section-foot--tight { text-align: center; margin-top: 36px; }
.section-cta {
  text-align: center;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-subtle);
}
.section-cta__text { color: var(--text-secondary); margin-bottom: 16px; }
.section--pt-tight { padding-top: 40px; }
.cta-section__desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 32px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* --- 窄栏容器 --- */
.container--narrow { max-width: 900px; }
.container--narrow-sm { max-width: 800px; }

/* --- 内页 Banner 变体 --- */
.inner-banner--xs { height: 280px; }
.inner-banner--sm { height: 300px; }
.inner-banner--lg { height: 360px; }
.inner-banner__tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--carbon-green);
  margin-bottom: 8px;
}

/* --- 数据看板 --- */
.data-preview--mb { margin-bottom: 60px; }
.data-preview__visual--card {
  padding: 48px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  min-height: 280px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.data-preview__visual .data-preview__visual-icon {
  font-size: 3.5rem;
  color: var(--carbon-green);
  opacity: 0.5;
  margin-bottom: 16px;
}
.data-preview__visual-title { color: var(--text-secondary); font-size: 1.1rem; font-weight: 600; }
.data-preview__visual-sub { font-size: 0.85rem; color: var(--text-muted); margin-top: 8px; }
.data-preview__metric-unit { color: var(--carbon-green); font-size: 0.7em; }
.data-preview__metric-unit--sm { font-size: 0.5em; }

/* --- 图片框 --- */
.media-frame { border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 48px; }
.media-frame--tight { margin-bottom: 32px; }
.media-frame__img { width: 100%; display: block; }

/* --- 数据统计 --- */
.stats--mt { margin-top: 48px; }

/* --- 详情页 --- */
.detail-gallery__img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
}
.detail-actions { display: flex; gap: 12px; margin-bottom: 40px; flex-wrap: wrap; }
.inquiry-card {
  margin-top: 56px;
  padding: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}
.inquiry-card__title { margin-bottom: 8px; }
.card__meta-date { font-size: 0.8rem; color: var(--text-muted); }
.list-header__desc { color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* --- 表单 --- */
.form-grid--2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid--3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 14px; }
.form-inline-row { display: flex; align-items: center; gap: 12px; }
.form-inline-row--mb { margin-bottom: 14px; }
.form-control--code { width: 140px; }
.form-control--code-sm { width: 130px; }
.form-control--mb { margin-bottom: 14px; }
.form-captcha { height: 44px; cursor: pointer; border-radius: var(--radius-sm); }
.form-captcha--sm { height: 42px; }
.form-intro { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 24px; }
.form-privacy { text-align: center; font-size: 0.78rem; color: var(--text-muted); margin-top: 12px; }
.contact-lead { color: var(--text-secondary); margin-bottom: 28px; }
.contact-form-card__title { font-size: 1.35rem; margin-bottom: 6px; }
.contact-coverage {
  margin-top: 28px;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  text-align: center;
}
.contact-coverage__icon {
  font-size: 3rem;
  color: var(--carbon-green);
  margin-bottom: 12px;
  display: block;
  opacity: 0.4;
}
.contact-coverage__title { color: var(--text-muted); font-size: 0.85rem; }
.contact-coverage__desc { color: var(--text-secondary); font-size: 0.8rem; margin-top: 4px; }

/* --- 搜索页 --- */
.search-hero {
  padding-top: 100px;
  padding-bottom: 32px;
  background: var(--bg-night);
  border-bottom: 1px solid var(--border-subtle);
}
.search-hero__title { text-align: center; font-size: 1.75rem; margin-bottom: 24px; }
.search-form-row__btn { flex-shrink: 0; }

/* --- 子栏目过滤栏 (sticky) --- */
.filter-bar-wrap {
  background: var(--bg-night);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 72px;
  z-index: 40;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* --- footer --- */
.footer__brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer__brand-name {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  line-height: 1.2;
}
.footer__brand-sub {
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--carbon-green);
}
.footer__qrcode-note { font-size: 0.8rem; color: var(--text-muted); margin-top: 10px; }
.footer__links-bar { padding-bottom: 20px; }
.footer__bottom-links { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.footer__sep { color: var(--border-subtle); }

/* ============================================================
   手机端专属元素 — 桌面隐藏 (PC 布局不受影响)
   ============================================================ */
.footer__col-chevron { display: none; }
.action-bar { display: none; }

/* ============================================================
   响应式断点 — 平板 (768px - 1023px)
   ============================================================ */
@media (max-width: 1023px) {
  :root { --section-py: 70px; }

  .container { padding: 0 20px; }
  .header__inner { padding: 0 20px; }
  .header__nav,
  .header__actions { display: none; }
  .hamburger { display: flex; }

  /* 侧滑菜单改由右侧滑出, 与右上汉堡键同侧 */
  .mobile-nav {
    left: auto;
    right: 0;
    transform: translateX(100%);
  }

  .hero__content { padding-left: 20px; padding-right: 20px; }

  .features { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 32px 16px; }
  .featured-grid { grid-template-columns: repeat(2, 1fr); }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .path-steps { grid-template-columns: repeat(2, 1fr); }
  .path-step::after { display: none; }
  .data-preview { grid-template-columns: 1fr; gap: 32px; }
  .list-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; padding-left: 20px; padding-right: 20px; }
  .detail__pager { flex-direction: column; gap: 8px; text-align: center; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .news-list-item { grid-template-columns: 180px 1fr; }

  /* 平板触控尺寸 (最小 44px 点击区) */
  .pagination a,
  .pagination span { min-width: 44px; height: 44px; }
  .filter-bar a { padding: 10px 18px; }
  .footer__links a { min-height: 44px; display: inline-flex; align-items: center; }
  .friend-links a { min-height: 44px; display: inline-flex; align-items: center; }
  .footer__social a { width: 44px; height: 44px; }
  .detail__pager a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
  }
}

/* ============================================================
   响应式断点 — 手机端 (< 768px)
   ★ 手机端为独立排版, 不是 PC 的等比缩小
   ============================================================ */
@media (max-width: 767px) {
  :root {
    --section-py: 48px;
    --container-max: 100%;
    --header-h: 60px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --gutter: 16px;
  }

  /* ---------- 全局 ---------- */
  html { -webkit-text-size-adjust: 100%; }
  html, body { width: 100%; max-width: 100vw; overflow-x: hidden; }
  body {
    display: block;              /* 去掉旧的 flex 居中 hack */
    font-size: 16px;             /* 正文不小于 16px */
    line-height: 1.75;
    padding-bottom: calc(58px + env(safe-area-inset-bottom));
  }
  .container { width: 100%; padding: 0 var(--gutter); margin: 0 auto; }
  .section { width: 100%; padding: var(--section-py) 0; }

  /* ---------- Header ---------- */
  .header__inner { padding: 0 var(--gutter); }
  .header__logo { flex: 1; min-width: 0; min-height: 44px; }
  .header__logo-icon { width: 34px; height: 34px; font-size: 0.95rem; }
  .header__logo-name { font-size: 0.95rem; }
  .header__logo-sub { display: none; }
  .hamburger { width: 44px; height: 44px; margin-right: -10px; }

  /* ---------- 抽屉导航 ---------- */
  .mobile-nav { width: min(84vw, 320px); max-width: none; }
  .mobile-nav__inner {
    padding: 0 var(--gutter) calc(24px + env(safe-area-inset-bottom));
    padding-top: 76px;
  }
  .mobile-nav__link {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 0 12px;
    font-size: 0.98rem;
  }
  .mobile-nav__link--toggle { justify-content: space-between; }
  .mobile-nav__sub { padding-left: 0; }
  .mobile-nav__sub a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 0 14px 0 26px;
  }
  .mobile-nav__brand { min-height: 44px; }
  .mobile-nav__foot { margin-top: 18px; padding-top: 16px; }
  .mobile-nav__foot .btn { width: 100%; justify-content: center; min-height: 46px; }

  /* ---------- Hero ---------- */
  .hero { height: 72vh; height: 72svh; min-height: 460px; max-height: 640px; width: 100%; }
  .hero__content {
    padding-bottom: 56px;
    padding-left: var(--gutter);
    padding-right: var(--gutter);
    text-align: center;
  }
  .hero__title { font-size: 1.72rem; line-height: 1.3; margin-bottom: 12px; }
  .hero__subtitle { font-size: 0.92rem; margin-bottom: 0; }
  .hero__actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    width: 100%;
    margin-top: 24px;
  }
  .hero__actions .btn {
    width: 100%;
    min-height: 46px;
    justify-content: center;
    padding: 12px 8px;
    font-size: 0.84rem;
  }
  .hero__scroll-indicator,
  .hero__music { display: none; }

  /* ---------- 内页 Banner / 面包屑 ---------- */
  .inner-banner { height: 190px; }
  .inner-banner--xs { height: 170px; }
  .inner-banner--sm { height: 180px; }
  .inner-banner--lg { height: 200px; }
  .inner-banner__content { padding: 0 var(--gutter); text-align: center; }
  .inner-banner__title { font-size: 1.35rem; }
  .inner-banner__tag { font-size: 0.76rem; }
  .breadcrumb { padding: 11px var(--gutter); font-size: 0.78rem; gap: 6px; }

  /* ---------- 区块标题 ---------- */
  .section-tag { font-size: 0.76rem; }
  .section-title { font-size: 1.34rem; line-height: 1.35; }
  .section-subtitle { font-size: 0.9rem; max-width: 100%; }
  .section-head--center,
  .list-header { margin-bottom: 26px; }
  .list-header__desc { font-size: 0.88rem; }
  .section-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 22px;
  }
  .section-bar .btn--ghost { display: none; }   /* 区块底部已有整行入口, 去掉重复 */
  .section-foot,
  .section-foot--tight { margin-top: 24px; }
  .section-foot .btn,
  .section-cta .btn { width: 100%; justify-content: center; min-height: 46px; }
  .section-cta { margin-top: 36px; padding-top: 26px; }
  .section-cta__text { font-size: 0.92rem; }
  .cta-section { padding: 48px var(--gutter) 52px; }
  .cta-section__title { font-size: 1.38rem; }
  .cta-section__desc { font-size: 0.92rem; margin-bottom: 22px; }
  .cta-section .btn--lg { width: 100%; justify-content: center; font-size: 0.95rem; padding: 14px 18px; }
  .media-frame { margin-bottom: 24px; }
  .media-frame--tight { margin-bottom: 20px; }

  /* ---------- 数据统计 → 田字格 ---------- */
  .stats {
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.02);
    overflow: hidden;
  }
  .stat-item {
    padding: 20px 10px;
    border-right: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
  }
  .stat-item:nth-child(2n) { border-right: none; }
  .stat-item:nth-last-child(-n + 2) { border-bottom: none; }
  .stat-item__number { font-size: 1.85rem; line-height: 1.15; margin-bottom: 6px; }
  .stat-item__label { font-size: 0.8rem; line-height: 1.45; }
  .stats--mt { margin-top: 28px; }

  /* ---------- 核心方案 2×2 ---------- */
  .features { grid-template-columns: 1fr 1fr; gap: 12px; }
  .feature-card { padding: 20px 14px; }
  .feature-card__icon { width: 46px; height: 46px; margin-bottom: 14px; font-size: 1.15rem; }
  .feature-card__title { font-size: 0.96rem; margin-bottom: 6px; }
  .feature-card__desc { font-size: 0.8rem; line-height: 1.6; }

  /* ---------- 卡片网格 ---------- */
  .list-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .featured-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .related-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .card__image { aspect-ratio: 4 / 3; }
  .card__body { padding: 12px; }
  .card__tag { font-size: 0.76rem; padding: 3px 9px; }
  .card__title { font-size: 0.94rem; line-height: 1.4; }
  .card__desc { font-size: 0.8rem; line-height: 1.6; }
  .card__meta { font-size: 0.76rem; gap: 6px; flex-wrap: wrap; }
  .card__meta-date { font-size: 0.76rem; }

  /* ---------- 典型案例 ---------- */
  .case-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .case-item__overlay {
    padding: 12px;
    background: linear-gradient(transparent 30%, rgba(6, 14, 24, 0.94) 100%);
  }
  .case-item__title { font-size: 0.9rem; line-height: 1.35; }
  .case-item__reduction { font-size: 0.76rem; }

  /* ---------- 实施路径 2×2 ---------- */
  .path-steps { grid-template-columns: 1fr 1fr; gap: 12px; }
  .path-step {
    padding: 20px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
  }
  .path-step::after { display: none; }
  .path-step__number { width: 44px; height: 44px; margin-bottom: 12px; font-size: 1rem; }
  .path-step__title { font-size: 0.98rem; margin-bottom: 6px; }
  .path-step__desc { font-size: 0.8rem; line-height: 1.6; }

  /* ---------- 数据看板 ---------- */
  .data-preview { grid-template-columns: 1fr; gap: 16px; }
  .data-preview--mb { margin-bottom: 40px; }
  .data-preview__visual,
  .data-preview__visual--card { min-height: 0; padding: 26px 18px; }
  .data-preview__visual .data-preview__visual-icon { font-size: 2.4rem; margin-bottom: 10px; }
  .data-preview__visual-title { font-size: 0.98rem; }
  .data-preview__visual-sub { font-size: 0.8rem; margin-top: 6px; }
  .data-preview__metrics { grid-template-columns: 1fr 1fr; gap: 10px; }
  .data-preview__metric { padding: 16px 10px; }
  .data-preview__metric-value { font-size: 1.3rem; }
  .data-preview__metric-label { font-size: 0.76rem; }

  /* ---------- 新闻列表 → 左图右文 ---------- */
  .news-list-item {
    grid-template-columns: 104px 1fr;
    gap: 12px;
    padding: 12px;
    margin-bottom: 10px;
    align-items: flex-start;
  }
  .news-list-item__thumb { aspect-ratio: 1 / 1; max-height: none; border-radius: var(--radius-md); }
  .news-list-item__info { justify-content: flex-start; }
  .news-list-item__title { font-size: 0.95rem; line-height: 1.45; margin-bottom: 4px; }
  .news-list-item__date { font-size: 0.76rem; margin-bottom: 6px; }
  .news-list-item__desc {
    font-size: 0.8rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  /* ---------- 搜索结果 ---------- */
  .search-result-item { gap: 12px; padding: 12px; margin-bottom: 10px; }
  .search-result-item__thumb { width: 96px; height: 96px; }
  .search-result-item__title { font-size: 0.94rem; }
  .search-result-item__desc { font-size: 0.8rem; }

  /* ---------- 筛选栏 ---------- */
  .filter-bar-wrap { top: 60px; }
  .filter-bar { gap: 6px; margin-bottom: 22px; padding-bottom: 6px; }
  .filter-bar a { padding: 9px 16px; font-size: 0.8rem; min-height: 38px; }

  /* ---------- 详情页 ---------- */
  .detail { max-width: 100%; }
  .detail__title { font-size: 1.28rem; line-height: 1.38; }
  .detail__meta-row { gap: 10px 16px; font-size: 0.78rem; }
  .detail__params { grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 24px; }
  .detail__param { padding: 12px 10px; }
  .detail__param-label { font-size: 0.76rem; }
  .detail__param-value { font-size: 0.92rem; }
  .detail__body { font-size: 0.92rem; line-height: 1.85; }
  .detail__body img { margin: 16px 0; }
  .detail__pager { flex-direction: column; align-items: stretch; gap: 12px; text-align: left; font-size: 0.82rem; margin-top: 32px; padding-top: 20px; }
  .detail__pager a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 44px;
    align-self: flex-start;
  }
  .detail-gallery__img { aspect-ratio: 4 / 3; }
  .detail-actions { gap: 10px; margin-bottom: 28px; }
  .detail-actions .btn { flex: 1; min-width: 0; justify-content: center; min-height: 44px; padding: 10px 8px; font-size: 0.84rem; }
  .inquiry-card { margin-top: 36px; padding: 20px 16px; }
  .related-title { font-size: 1.15rem; margin: 36px 0 18px; }
  .tab-nav { margin-bottom: 22px; }
  .tab-nav button { padding: 12px 16px; font-size: 0.84rem; min-height: 44px; }

  /* ---------- 表单 ---------- */
  .form-grid--2,
  .form-grid--3 { grid-template-columns: 1fr; gap: 12px; margin-bottom: 12px; }
  .form-inline-row { gap: 10px; }
  .form-inline-row--mb { margin-bottom: 12px; }
  .form-control--code,
  .form-control--code-sm { width: 100%; min-width: 0; flex: 1; }
  .form-control--mb { margin-bottom: 12px; }
  .form-group label { font-size: 0.84rem; }
  .form-control {
    padding: 13px 14px;
    font-size: 16px;   /* 防止 iOS 聚焦缩放 */
    min-height: 48px;
  }
  .form-captcha,
  .form-captcha--sm { height: 48px; flex-shrink: 0; width: 104px; object-fit: cover; }
  .form-intro { font-size: 0.86rem; margin-bottom: 18px; }
  .form-privacy { font-size: 0.76rem; }
  .contact-form-card { padding: 20px 16px; }
  .contact-form-card__title { font-size: 1.2rem; }
  .contact-lead { font-size: 0.9rem; margin-bottom: 20px; }
  .contact-grid { grid-template-columns: 1fr; gap: 28px; }
  .contact-info__item { gap: 12px; }
  .contact-coverage { margin-top: 22px; padding: 24px 16px; }
  .contact-coverage__icon { font-size: 2.4rem; margin-bottom: 10px; }
  .search-hero { padding-top: 90px; padding-bottom: 24px; }
  .search-hero__title { font-size: 1.45rem; margin-bottom: 18px; }
  .search-form-row { gap: 8px; }
  .search-form-row .btn { min-height: 48px; padding: 10px 18px; }
  /* 输入框可收缩, 避免窄屏把按钮挤出视口 */
  .search-input-wrap { min-width: 0; }
  .search-form-row .form-control { min-width: 0; }
  .search-form-row__btn { flex-shrink: 0; }
  .subscribe-card { padding: 22px 16px; }
  .empty-state { padding: 44px 16px; }
  .empty-state i { font-size: 2.4rem; }
  .empty-state p { font-size: 0.88rem; }

  /* ---------- 分页 / 按钮 ---------- */
  .pagination { gap: 4px; margin-top: 32px; flex-wrap: wrap; }
  .pagination a,
  .pagination span { min-width: 44px; height: 44px; font-size: 0.84rem; }
  .btn { padding: 11px 20px; font-size: 0.86rem; min-height: 44px; }

  /* ---------- Footer ---------- */
  .footer__grid {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 24px var(--gutter) 0;
    text-align: left;
  }
  .footer__grid > div:first-child { text-align: center; padding-bottom: 18px; }
  .footer__brand { justify-content: center; margin-bottom: 12px; }
  .footer__brand-sub { font-size: 0.7rem; letter-spacing: 0.12em; }
  .footer__brand-desc { font-size: 0.82rem; line-height: 1.7; margin: 10px 0 14px; }
  .footer__social { justify-content: center; }
  .footer__social a { width: 44px; height: 44px; }

  .footer__col { border-top: 1px solid var(--border-subtle); }
  .footer__col-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 52px;
    margin-bottom: 0;
    font-size: 0.95rem;
    cursor: pointer;
  }
  .footer__col-chevron {
    display: inline-block;
    font-size: 0.76rem;
    color: var(--text-muted);
    transition: transform var(--duration-fast) var(--ease-out);
  }
  .footer__col.is-open .footer__col-chevron { transform: rotate(180deg); }
  .footer__col-body { padding-bottom: 16px; }
  .footer__links { gap: 0; }
  .footer__links a {
    display: flex;
    align-items: center;
    min-height: 44px;
    font-size: 0.86rem;
    color: var(--text-secondary);
  }
  .footer__contact-item { font-size: 0.84rem; margin-bottom: 12px; padding-right: 8px; }
  .footer__qrcode-note { font-size: 0.78rem; }
  /* 无 JS 时保持展开, 有 JS 时折叠为手风琴 */
  .js .footer__col-body { display: none; }
  .js .footer__col.is-open .footer__col-body { display: block; }

  .friend-links { display: none; }
  .footer__links-bar { padding-bottom: 0; }
  .footer__bottom { padding: 18px var(--gutter); }
  .footer__bottom-inner {
    flex-direction: column;
    gap: 10px;
    padding: 0;
    text-align: center;
    font-size: 0.76rem;
    line-height: 1.7;
  }
  .footer__bottom-links { justify-content: center; gap: 8px; }

  /* 底部悬浮键让位于底部操作栏 */
  .online-service,
  .back-top { display: none; }

  /* ---------- 手机端底部操作栏 ---------- */
  .action-bar {
    display: flex;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 95;
    background: rgba(6, 14, 24, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-subtle);
    padding-bottom: env(safe-area-inset-bottom);
  }
  .action-bar__item {
    flex: 1;
    min-width: 0;
    min-height: 58px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    font-size: 0.72rem;
    line-height: 1.2;
    color: var(--text-muted);
    background: none;
    border: none;
    font-family: inherit;
    transition: color var(--duration-fast) var(--ease-out);
  }
  .action-bar__item i { font-size: 1.05rem; }
  .action-bar__item:active { color: var(--carbon-green); }
  .action-bar__item--primary { color: var(--carbon-green); font-weight: 600; }
  .action-bar__item--primary i {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--carbon-gradient);
    color: #fff;
    font-size: 0.86rem;
  }

  /* ---------- 触摸反馈 ---------- */
  .card:active,
  .case-item:active,
  .feature-card:active,
  .news-list-item:active,
  .search-result-item:active,
  .filter-bar a:active { opacity: 0.75; }
}

/* ============================================================
   响应式断点 — 小屏手机 (< 375px)
   ============================================================ */
@media (max-width: 374px) {
  :root { --section-py: 42px; --gutter: 13px; }

  body { font-size: 15px; }
  .container { padding: 0 var(--gutter); }

  .hero { min-height: 420px; }
  .hero__title { font-size: 1.5rem; }
  .hero__actions { grid-template-columns: 1fr; }
  .hero__actions .btn { font-size: 0.86rem; }

  .section-title { font-size: 1.22rem; }
  .cta-section__title { font-size: 1.24rem; }

  .stats { grid-template-columns: 1fr; }
  .stat-item { border-right: none; }
  .stat-item:not(:last-child) { border-bottom: 1px solid var(--border-subtle); }

  .features,
  .list-grid,
  .featured-grid,
  .related-grid,
  .case-grid,
  .path-steps { grid-template-columns: 1fr; }

  .news-list-item { grid-template-columns: 88px 1fr; gap: 10px; padding: 10px; }
  .news-list-item__title { font-size: 0.9rem; }
  .search-result-item__thumb { width: 80px; height: 80px; }

  .detail__params { grid-template-columns: 1fr; }
  .detail-actions { flex-direction: column; }
  .detail-actions .btn { width: 100%; }

  .form-captcha,
  .form-captcha--sm { width: 88px; }

  .pagination a,
  .pagination span { min-width: 38px; height: 40px; font-size: 0.78rem; }
  .action-bar__item { font-size: 0.68rem; }
  .action-bar__item i { font-size: 1rem; }
}

/* ============================================================
   偏好：减少动画
   ============================================================ */
@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;
  }
}