/**
 * 鼎丰幕墙型材 — 企业官网主样式
 * 建筑结构感 · 精密制造 · 工程语言
 * 配色：银灰 + 深蓝灰 + 白色 + 亮蓝点缀
 * 技术栈：原生CSS + AOS + Swiper + FA6
 * 遵循PBootCMS AI开发规范附录E全部约束
 */

/* ============================================================
   Web 字体 — Inter (专业现代无衬线)
   ============================================================ */


/* ============================================================
   CSS 变量体系 — 建筑幕墙色彩
   ============================================================ */
:root {
  /* 主色系 — 银灰 / 深蓝灰 / 白色 */
  --color-white: #FFFFFF;
  --color-silver-50: #F8F9FB;
  --color-silver-100: #EFF1F5;
  --color-silver-200: #E2E5EA;
  --color-silver-300: #D1D5DB;
  --color-silver-400: #9CA3AF;
  --color-silver-500: #6B7280;

  --color-bluegray-900: #111827;
  --color-bluegray-800: #1A2129;
  --color-bluegray-700: #232B36;
  --color-bluegray-600: #2C3540;
  --color-bluegray-500: #374151;
  --color-bluegray-400: #4B5563;
  --color-bluegray-300: #6B7280;

  /* 强调色 — 亮蓝（结构线高亮） */
  --color-accent: #2563EB;
  --color-accent-light: #3B82F6;
  --color-accent-dark: #1D4ED8;
  --color-accent-dim: rgba(37, 99, 235, 0.08);
  --color-accent-glow: rgba(37, 99, 235, 0.15);

  /* 文字色阶 */
  --text-heading: #111827;
  --text-body: #374151;
  --text-secondary: #6B7280;
  --text-muted: #9CA3AF;
  --text-inverse: #F8F9FB;

  /* 背景 */
  --bg-page: #F8F9FB;
  --bg-section-alt: #EFF1F5;
  --bg-dark: #1A2129;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8F9FB;

  /* 边框 */
  --border-default: #E2E5EA;
  --border-light: #EFF1F5;
  --border-accent: rgba(37, 99, 235, 0.25);

  /* 圆角 — 小圆角精密感 */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* 阴影 — 克制、精密 */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);

  /* 间距 */
  --section-py: 96px;
  --container-max: 1200px;
  --header-h: 68px;

  /* 过渡 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 600ms;

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

/* ============================================================
   全局重置
   ============================================================ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg-page);
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
::selection { background: rgba(37, 99, 235, 0.15); color: var(--color-accent-dark); }
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg-page); }
::-webkit-scrollbar-thumb { background: var(--color-silver-300); border-radius: 3px; }
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); }

/* ============================================================
   排版
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-heading);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

/* 英文标签 */
.section-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

/* 中文区域标题 */
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
}

/* 区块描述（居中）+ 装饰线 */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header::after {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background: var(--color-accent);
  margin: 16px auto 0;
}

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

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

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

.section--dark {
  background: var(--bg-dark);
  color: var(--text-inverse);
}

.section--dark .section-title { color: #fff; }
.section--dark .section-subtitle { color: var(--color-silver-400); }
.section--dark .section-header::after { background: var(--color-accent-light); }

/* 装饰分割线（建筑结构感） */
.section-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-default), transparent);
}

/* ============================================================
   Header — 白色实底 + 深色文字（13.11铁律）
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow var(--duration-normal) var(--ease-out);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.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: 36px;
  height: 36px;
  background: var(--color-bluegray-800);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-heading);
  letter-spacing: -0.02em;
}

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

.header__logo-name {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-heading);
}

.header__logo-sub {
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  text-transform: uppercase;
}

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

.header__nav-link {
  padding: 8px 14px;
  font-size: 0.88rem;
  color: var(--text-body);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
  font-weight: 500;
}

.header__nav-link:hover,
.header__nav-link.active {
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

/* 导航下拉(13.3: z-index足够高) */
.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: 160px;
  padding: 6px 0;
  background: #fff;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: all var(--duration-normal) var(--ease-out);
  z-index: 60;
}

.header__dropdown a {
  display: block;
  padding: 9px 18px;
  font-size: 0.85rem;
  color: var(--text-body);
  transition: all var(--duration-fast);
}

.header__dropdown a:hover {
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

/* 右侧操作 */
.header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 20px;
}

.header__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.header__cta:hover {
  background: var(--color-accent-dark);
  color: #fff;
  box-shadow: 0 2px 8px var(--color-accent-glow);
}

/* ============================================================
   汉堡菜单 — 独立于header__actions外(13.4)
   ============================================================ */
.hamburger {
  display: none;
  width: 38px;
  height: 38px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 110;
  margin-left: 4px;
}

.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-heading);
  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;
}
.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: 88%;
  max-width: 400px;
  background: #fff;
  z-index: 120;
  transform: translateX(-100%);
  transition: transform var(--duration-normal) var(--ease-out);
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.mobile-nav.open { transform: translateX(0); }

.mobile-nav__inner {
  padding: 28px 24px;
  padding-top: 80px;
}

.mobile-nav__link {
  display: block;
  padding: 13px 14px;
  font-size: 0.95rem;
  color: var(--text-body);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.mobile-nav__link:hover {
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

.mobile-nav__sub {
  padding-left: 14px;
  display: none;
}

.mobile-nav__sub.open { display: block; }

.mobile-nav__sub a {
  display: block;
  padding: 10px 14px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
}

.mobile-nav__overlay {
  position: fixed;
  inset: 0;
  background: rgba(17, 24, 39, 0.5);
  z-index: 115;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal);
}

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

/* ============================================================
   按钮系统
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.9rem;
  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(--color-accent);
  color: #fff;
}
.btn--primary:hover {
  background: var(--color-accent-dark);
  color: #fff;
  box-shadow: 0 4px 16px var(--color-accent-glow);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--text-heading);
  border: 1px solid var(--border-default);
}
.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn--ghost:hover {
  color: var(--color-accent);
}

.btn--white-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.25);
}
.btn--white-outline:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.06);
  color: #fff;
}

.btn--lg { padding: 14px 32px; font-size: 1rem; }

/* ============================================================
   卡片系统 — 银灰底 + 白边精密感
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
  border-color: var(--color-silver-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card__image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--bg-section-alt);
}

.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(1.04);
}

.card__body {
  padding: 20px;
}

.card__tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-dim);
  border-radius: 3px;
  margin-bottom: 8px;
}

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

.card__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border-light);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.card__meta i { color: var(--color-accent); font-size: 0.7rem; }

/* 产品卡片特有样式 */
.card--product .card__image {
  aspect-ratio: 1/1;
  background: linear-gradient(135deg, #F8F9FB 0%, #EFF1F5 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card--product .card__image img {
  object-fit: contain;
  max-height: 80%;
}

/* 案例卡片 — 大图 */
.card--case .card__image { aspect-ratio: 16/10; }

/* ============================================================
   首页 — Hero Banner（建筑结构感）
   ============================================================ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 620px;
  overflow: hidden;
  background: var(--bg-dark);
}

/* Swiper背景 */
.hero .swiper {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

/* 深灰遮罩 */
.hero__overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(180deg,
    rgba(26, 33, 41, 0.55) 0%,
    rgba(26, 33, 41, 0.35) 40%,
    rgba(26, 33, 41, 0.8) 100%);
}

/* 文字内容 */
.hero__content {
  position: relative;
  z-index: 3;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 建筑结构线装饰 */
.hero__content::before {
  content: '';
  display: block;
  width: 60px;
  height: 2px;
  background: var(--color-accent-light);
  margin-bottom: 28px;
  opacity: 0.8;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5.5vw, 3.5rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: clamp(0.95rem, 1.8vw, 1.15rem);
  color: rgba(255,255,255,0.7);
  margin-bottom: 2rem;
  font-weight: 300;
  letter-spacing: 0.04em;
}

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

/* Swiper分页器 */
.hero-pagination {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  gap: 6px;
}

.hero-pagination .swiper-pagination-bullet {
  width: 36px;
  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: 48px;
  background: #fff;
  box-shadow: 0 0 8px rgba(255,255,255,0.3);
}

/* 滚动指示 */
.hero__scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,0.4);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.hero__scroll-line {
  width: 1px;
  height: 28px;
  background: linear-gradient(180deg, rgba(255,255,255,0.5), transparent);
}

/* ============================================================
   首页 — 结构数据区（深灰背景 + 亮蓝数字）
   ============================================================ */
.stats-section {
  background: var(--bg-dark);
  padding: 64px 0;
}

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

.stat-item {
  padding: 24px 12px;
}

.stat-item__number {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  font-weight: 700;
  color: #fff;
  line-height: 1;
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}

.stat-item__number span {
  color: var(--color-accent-light);
}

.stat-item__label {
  font-size: 0.85rem;
  color: var(--color-silver-400);
  letter-spacing: 0.02em;
}

.stat-item__unit {
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--color-accent-light);
}

/* ============================================================
   首页 — 产品分类网格
   ============================================================ */
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.product-cat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 36px 20px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all var(--duration-normal) var(--ease-out);
}

.product-cat-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.product-cat-card__icon {
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-section-alt);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: 2rem;
  color: var(--color-bluegray-600);
  transition: all var(--duration-normal);
}

.product-cat-card:hover .product-cat-card__icon {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.product-cat-card__name {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 4px;
}

.product-cat-card__desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ============================================================
   首页 — 工程案例横排
   ============================================================ */
.cases-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.case-featured {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4/3;
}

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

.case-featured:hover img {
  transform: scale(1.05);
}

.case-featured__info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px 20px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: #fff;
}

.case-featured__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.case-featured__data {
  font-size: 0.8rem;
  color: var(--color-silver-300);
  font-family: var(--font-mono);
}

/* ============================================================
   首页 — CTA区（深灰底 + 亮蓝边框）
   ============================================================ */
.cta-section {
  background: var(--bg-dark);
  padding: 80px 0;
  text-align: center;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent-dark), transparent);
}

.cta-box {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 40px;
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.02);
}

.cta-box__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: #fff;
  margin-bottom: 0.5rem;
}

.cta-box__desc {
  color: var(--color-silver-400);
  margin-bottom: 28px;
  font-size: 0.95rem;
}

/* ============================================================
   首页 — 型材规格速查表
   ============================================================ */
.specs-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.specs-table thead th {
  background: var(--color-bluegray-800);
  color: var(--text-inverse);
  padding: 14px 16px;
  font-weight: 600;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.specs-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-body);
}

.specs-table tbody tr:hover td {
  background: var(--color-accent-dim);
}

.specs-table .specs-table__series {
  font-weight: 600;
  color: var(--text-heading);
  font-family: var(--font-mono);
}

.specs-table .specs-table__value {
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-weight: 500;
}

/* ============================================================
   首页 — 左图右文指南区
   ============================================================ */
.guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.guide-image {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4/3;
  border: 1px solid var(--border-default);
}

.guide-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.guide-text {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.guide-text p {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ============================================================
   内页 Banner（建筑结构感）
   ============================================================ */
.inner-banner {
  position: relative;
  height: 300px;
  overflow: hidden;
  background: var(--bg-dark);
}

.inner-banner__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.45;
}

.inner-banner__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg,
    rgba(26, 33, 41, 0.6) 0%,
    rgba(26, 33, 41, 0.5) 50%,
    rgba(26, 33, 41, 0.9) 100%);
}

.inner-banner__content {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-bottom: 36px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.inner-banner__breadcrumb {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.55);
  margin-bottom: 8px;
}

.inner-banner__breadcrumb a { color: rgba(255,255,255,0.7); }
.inner-banner__breadcrumb a:hover { color: #fff; }
.inner-banner__breadcrumb i { margin: 0 6px; font-size: 0.6rem; }

.inner-banner__title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: #fff;
}

.inner-banner__subtitle {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}

/* 面包屑（正文区域） */
.breadcrumb-bar {
  background: #fff;
  border-bottom: 1px solid var(--border-light);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 12px 24px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb i { font-size: 0.55rem; color: var(--color-silver-300); }

/* ============================================================
   子栏目过滤栏
   ============================================================ */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  padding: 14px 0;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

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

.filter-bar a {
  display: inline-flex;
  padding: 7px 16px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-body);
  border: 1px solid var(--border-default);
  border-radius: 100px;
  white-space: nowrap;
  transition: all var(--duration-fast);
  flex-shrink: 0;
}

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

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

.list-header {
  margin-bottom: 36px;
}

.list-header h1 {
  font-size: 1.75rem;
  margin-bottom: 4px;
}

/* ============================================================
   详情页
   ============================================================ */
.detail {
  max-width: 860px;
  margin: 0 auto;
}

/* 详情图轮播 */
.detail-gallery {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 36px;
  border: 1px solid var(--border-light);
}

.detail-gallery .swiper-slide {
  aspect-ratio: 16/9;
}

.detail-gallery .swiper-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail__header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.detail__title {
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  margin-bottom: 10px;
}

.detail__meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.detail__meta-row i { margin-right: 3px; color: var(--color-accent); }

/* 参数卡片区 */
.detail__params {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin-bottom: 32px;
}

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

.detail__param-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  letter-spacing: 0.02em;
}

.detail__param-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-heading);
  font-family: var(--font-mono);
}

.detail__body {
  color: var(--text-body);
  line-height: 2;
  font-size: 0.93rem;
}

.detail__body p { margin-bottom: 14px; }
.detail__body img { border-radius: var(--radius-md); margin: 20px 0; }
.detail__body h2, .detail__body h3, .detail__body h4 {
  font-family: var(--font-heading);
  color: var(--text-heading);
  margin-top: 28px;
  margin-bottom: 12px;
}

/* Tab切换 */
.detail__tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border-light);
  margin-bottom: 28px;
}

.detail__tab-btn {
  padding: 12px 22px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: all var(--duration-fast);
}

.detail__tab-btn:hover { color: var(--text-body); }
.detail__tab-btn.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

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

/* 上下篇导航 */
.detail__pager {
  display: flex;
  justify-content: space-between;
  margin-top: 44px;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.detail__pager a { color: var(--text-secondary); }
.detail__pager a:hover { color: var(--color-accent); }

/* 相关推荐 */
.related-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 52px 0 20px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

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

.contact-info__item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
  transition: all var(--duration-fast);
}

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

.contact-info__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  flex-shrink: 0;
}

.contact-info__label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 2px;
}

.contact-info__value {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* 联系表单 */
.contact-form-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  color: var(--text-body);
  font-weight: 500;
  margin-bottom: 5px;
}

.form-group label .required { color: #DC2626; }

.form-control {
  width: 100%;
  padding: 11px 14px;
  background: var(--bg-page);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--text-heading);
  font-size: 0.88rem;
  transition: all var(--duration-fast);
}

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

textarea.form-control {
  resize: vertical;
  min-height: 90px;
}

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='%236B7280' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 34px;
}

/* ============================================================
   经销商页
   ============================================================ */
.dealer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.dealer-card {
  text-align: center;
  padding: 36px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all var(--duration-normal);
}

.dealer-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.dealer-card__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--color-accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--color-accent);
}

.dealer-card__title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 6px;
}

.dealer-card__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================================
   搜索页
   ============================================================ */
.search-box {
  max-width: 640px;
  margin: 0 auto;
}

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

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

.search-input-wrap i {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-input-wrap input {
  width: 100%;
  padding: 13px 16px 13px 40px;
  background: #fff;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--text-heading);
  font-size: 0.92rem;
}

.search-input-wrap input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}

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

.search-result-item:hover {
  border-color: var(--border-accent);
}

.search-result-item__thumb {
  width: 100px;
  height: 76px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-section-alt);
}

.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: 0.95rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 3px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.search-result-item__date { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 4px; }
.search-result-item__desc {
  font-size: 0.82rem;
  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: 38px;
  height: 38px;
  padding: 0 6px;
  font-size: 0.85rem;
  color: var(--text-body);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  transition: all var(--duration-fast);
  background: #fff;
}

.pagination a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.pagination .active {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  font-weight: 600;
}

.pagination .disabled {
  color: var(--text-muted);
  pointer-events: none;
}

/* ============================================================
   空状态
   ============================================================ */
.empty-state {
  text-align: center;
  padding: 56px 20px;
}

.empty-state i {
  font-size: 2.5rem;
  color: var(--color-silver-300);
  margin-bottom: 14px;
}

.empty-state p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ============================================================
   Footer — 深灰色四列
   ============================================================ */
.footer {
  background: var(--bg-dark);
  color: var(--text-inverse);
}

.footer__top-line {
  height: 2px;
  background: var(--color-accent);
  opacity: 0.5;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding: 56px 0 36px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.footer__brand-desc {
  font-size: 0.85rem;
  color: var(--color-silver-400);
  line-height: 1.7;
  margin: 14px 0;
}

.footer__col-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 18px;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer__links a {
  font-size: 0.84rem;
  color: var(--color-silver-400);
  transition: color var(--duration-fast);
}

.footer__links a:hover { color: var(--color-accent-light); }

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 0.82rem;
  color: var(--color-silver-400);
  margin-bottom: 9px;
}

.footer__contact-item i {
  color: var(--color-accent-light);
  margin-top: 3px;
  flex-shrink: 0;
  font-size: 0.75rem;
}

.footer__qrcode {
  width: 110px;
  height: 110px;
  background: #fff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.68rem;
  color: #999;
}

/* 友情链接 */
.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  padding: 0 0 24px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.friend-links__label {
  font-size: 0.78rem;
  color: var(--color-silver-400);
  flex-shrink: 0;
}

.friend-links a {
  font-size: 0.78rem;
  color: var(--color-silver-500);
  transition: color var(--duration-fast);
}

.friend-links a:hover { color: var(--color-accent-light); }

/* 底部版权 */
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 18px 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: 0.78rem;
  color: var(--color-silver-500);
  flex-wrap: wrap;
  gap: 8px;
}

.footer__bottom a { color: var(--color-silver-500); }
.footer__bottom a:hover { color: var(--color-accent-light); }

/* ============================================================
   返回顶部
   ============================================================ */
.back-top {
  position: fixed;
  right: 18px;
  bottom: 72px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: #fff;
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  cursor: pointer;
  z-index: 80;
  opacity: 0;
  pointer-events: none;
  transition: all var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-sm);
}

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

.back-top:hover {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

/* ============================================================
   动画系统 — 建筑结构感
   ============================================================ */

/* 亮蓝线条扫描 */
@keyframes lineScan {
  0% { width: 0; left: 0; }
  50% { width: 100%; left: 0; }
  100% { width: 0; left: 100%; }
}

/* 边框发光 */
@keyframes borderPulse {
  0%, 100% { border-color: var(--color-accent); box-shadow: 0 0 0 0 var(--color-accent-glow); }
  50% { box-shadow: 0 0 0 6px transparent; }
}

/* 结构线条装饰动画 */
.structure-line {
  position: relative;
}

.structure-line::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.3;
}

/* 数字跳动动画 */
@keyframes countUp {
  0% { opacity: 0; transform: translateY(12px); }
  100% { opacity: 1; transform: translateY(0); }
}

.countup-animate {
  animation: countUp 0.6s var(--ease-out) both;
}

/* Hero建筑结构装饰线 */
@keyframes buildLine {
  0% { transform: scaleX(0); }
  100% { transform: scaleX(1); }
}

.hero__content::before {
  animation: buildLine 1s var(--ease-out) 0.3s both;
  transform-origin: center;
}

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

/* ============================================================
   响应式 — 平板 (768px - 1023px)
   ============================================================ */
@media (max-width: 1023px) {
  :root { --section-py: 72px; }

  .header__nav,
  .header__actions { display: none; }

  .hamburger { display: flex; }

  .container { padding: 0 20px; }

  .hero { height: 90vh; min-height: 500px; }

  .section-title { font-size: 1.6rem; }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px 16px;
  }

  .products-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .cases-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

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

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

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

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

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

  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================
   响应式 — 移动端 (< 768px)
   ============================================================ */
@media (max-width: 767px) {
  :root {
    --section-py: 56px;
    --header-h: 60px;
    --container-max: 100%;
  }

  body { font-size: 16px; }

  .container { padding: 0 16px; }

  .section-header { margin-bottom: 36px; }

  .hero {
    height: 100vh;
    min-height: 520px;
  }

  .hero__title { font-size: 2rem; }
  .hero__subtitle { font-size: 1rem; }
  .hero__actions { flex-direction: column; align-items: center; }
  .hero__actions .btn { width: 100%; max-width: 300px; justify-content: center; font-size: 1rem; }

  .inner-banner { height: 240px; }
  .inner-banner__title { font-size: 1.6rem; }

  .section-title { font-size: 1.5rem; }
  .section-tag { font-size: 0.75rem; }

  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .stat-item__number { font-size: 2rem; }
  .stat-item__label { font-size: 0.8rem; }

  .products-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .product-cat-card {
    padding: 28px 12px 22px;
  }
  .product-cat-card__icon {
    width: 56px; height: 56px;
    font-size: 1.5rem;
    margin-bottom: 12px;
  }
  .product-cat-card__name { font-size: 0.88rem; }
  .product-cat-card__desc { font-size: 0.75rem; }

  .list-grid { grid-template-columns: 1fr; gap: 16px; }
  .card__body { padding: 16px; }
  .card__title { font-size: 1rem; }

  .cases-row { grid-template-columns: 1fr; gap: 16px; }
  .case-featured { aspect-ratio: 3/2; }

  .dealer-grid { grid-template-columns: 1fr; gap: 16px; }
  .dealer-card { padding: 32px 20px; }
  .dealer-card__icon { width: 48px; height: 48px; font-size: 1.2rem; }

  .guide-grid { gap: 24px; }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer__bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  .detail__title { font-size: 1.3rem; }
  .detail__params {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  .detail__param { padding: 14px 10px; }
  .detail__param-value { font-size: 0.9rem; }
  .detail__pager { flex-direction: column; gap: 6px; }
  .related-grid { grid-template-columns: 1fr; gap: 14px; }

  .contact-grid { gap: 24px; }
  .contact-form-card { padding: 24px 16px; }
  .contact-info__item { padding: 14px; }

  .search-result-item { flex-direction: column; }
  .search-result-item__thumb { width: 100%; height: 160px; }

  .back-top { right: 12px; bottom: 60px; }
  .cta-box { padding: 36px 20px; }
  .cta-box__title { font-size: 1.3rem; }

  .specs-table-wrap { margin: 0 -16px; }
  .specs-table thead th,
  .specs-table tbody td { padding: 10px 12px; font-size: 0.78rem; }

  .breadcrumb { padding: 12px 16px; }
  .filter-bar a { padding: 8px 14px; font-size: 0.78rem; }

  .pagination a, .pagination span {
    min-width: 34px; height: 34px;
    font-size: 0.8rem;
  }

  /* 移动端菜单 — 全宽大字号 */
  .mobile-nav {
    width: 100%;
    max-width: 100%;
  }
  .mobile-nav__inner {
    padding: 28px 24px;
    padding-top: 80px;
  }
  .mobile-nav__link {
    padding: 16px 14px;
    font-size: 1.1rem;
    font-weight: 500;
  }
  .mobile-nav__sub a {
    padding: 14px 14px;
    font-size: 1rem;
  }
  .mobile-nav__sub {
    padding-left: 20px;
  }
}

/* ============================================================
   响应式 — 小屏手机 (< 375px)
   ============================================================ */
@media (max-width: 374px) {
  :root { --section-py: 44px; }
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .product-cat-card { padding: 20px 8px 16px; }
  .product-cat-card__icon { width: 44px; height: 44px; font-size: 1.2rem; }
  .stats { gap: 14px; }
  .stat-item__number { font-size: 1.6rem; }
  .btn { padding: 10px 20px; font-size: 0.85rem; }
  .btn--lg { padding: 12px 24px; font-size: 0.95rem; }
}

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