/**
 * VoltCore 伏核能源 — 主样式表
 * 电芯→PACK→系统 垂直整合 精密制造
 * 深色基底 + 铜色点缀 + 小圆角精密感
 * 字体: Inter + Noto Sans SC (Google Fonts)
 * 纯原生 CSS，无框架依赖
 */


/* ============================================================
   CSS 变量体系
   ============================================================ */
:root {
  /* 基底色 — 工业深黑 */
  --bg-deep: #0A0A0A;
  --bg-base: #111111;
  --bg-card: #1A1A1A;
  --bg-card-hover: #222222;
  --bg-input: #1A1A1A;
  --bg-overlay: rgba(0, 0, 0, 0.75);

  /* 铜色系 — 仅作点缀（电芯外壳隐喻） */
  --copper: #B87333;
  --copper-dim: rgba(184, 115, 51, 0.12);
  --copper-glow: rgba(184, 115, 51, 0.25);
  --copper-bright: #D4884A;
  --copper-dark: #8B5A2A;

  /* 金属银系 — 次级元素 */
  --silver: #A8A8A8;
  --silver-dim: rgba(168, 168, 168, 0.08);
  --silver-border: rgba(168, 168, 168, 0.12);

  /* 文字色阶 */
  --text-primary: #F0F0F0;
  --text-secondary: #A0A0A0;
  --text-muted: #606060;
  --text-white: #FFFFFF;

  /* 功能色 */
  --success: #2ECC71;
  --warning: #E67E22;
  --danger: #E74C3C;

  /* 边框 — 精密细线 */
  --border-thin: rgba(255, 255, 255, 0.06);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-copper: rgba(184, 115, 51, 0.3);
  --border-active: rgba(184, 115, 51, 0.5);

  /* 圆角 — 精密小圆角 */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* 间距 */
  --section-py: 100px;
  --section-py-sm: 60px;
  --container-max: 1200px;
  --header-h: 68px;

  /* 过渡 */
  --ease-fast: 0.15s ease;
  --ease-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --ease-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.5);
  --shadow-copper: 0 0 0 1px var(--copper-dim), 0 0 16px rgba(184, 115, 51, 0.08);

  /* 字体 — Inter(拉丁/数字) + Noto Sans SC(中文) + JetBrains Mono(等宽) */
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-heading: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Cascadia 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-deep);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 微妙网格纹理背景 */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(180deg, #0A0A0A 0%, #111111 30%, #0D0D0D 100%);
  pointer-events: none;
}

::selection {
  background: rgba(184, 115, 51, 0.3);
  color: #fff;
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--ease-fast);
}

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;
}

.section-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--copper);
  margin-bottom: 0.75rem;
  position: relative;
}
.section-tag::before {
  content: '▎';
  margin-right: 6px;
  color: var(--copper);
}

.section-title {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}

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

.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header--left {
  text-align: left;
}

/* ============================================================
   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--sm {
  padding: var(--section-py-sm) 0;
}

/* 精密分割线 */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-thin), transparent);
  margin: 0;
}
.divider--copper {
  background: linear-gradient(90deg, transparent, var(--border-copper), transparent);
  height: 1px;
}

/* ============================================================
   Header 头部 — 深色固定
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(17, 17, 17, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-thin);
  transition: all var(--ease-normal);
}

.header.scrolled {
  background: rgba(10, 10, 10, 0.97);
  border-bottom-color: var(--border-copper);
}

.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: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.header__logo-icon i {
  font-size: 1.6rem;
  color: var(--copper);
}
/* 电芯logo图标 — SVG铜色几何 */
.header__logo-icon::after {
  content: '';
  position: absolute;
  inset: 2px;
  border: 1.5px solid var(--copper);
  border-radius: var(--radius-xs);
  opacity: 0.5;
}

.header__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.header__logo-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}
.header__logo-sub {
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--copper);
  font-weight: 500;
}

/* 主导航 */
.header__nav {
  display: flex;
  align-items: center;
  gap: 0;
}

.header__nav-link {
  padding: 8px 15px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--ease-fast);
  white-space: nowrap;
  position: relative;
}

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

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 15px;
  right: 15px;
  height: 1px;
  background: var(--copper);
  transform: scaleX(0);
  transition: transform var(--ease-normal);
}
.header__nav-link:hover::after,
.header__nav-link.active::after {
  transform: scaleX(1);
}

/* 导航下拉 */
.header__nav-item {
  position: relative;
}
/* PC端: hover展开 + click也能展开 */
.header__nav-item:hover .header__dropdown,
.header__nav-item.dropdown-open .header__dropdown,
.header__nav-item .header__nav-link:focus + .header__dropdown,
.header__dropdown:hover {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}
/* 移动端: 点击展开 */
.header__nav-item.dropdown-open-mobile .header__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}
/* 下拉菜单显示时,确保链接可点击 */
.header__dropdown a {
  pointer-events: auto;
  position: relative;
  z-index: 61;
}

.header__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 170px;
  padding: 6px 0;
  background: rgba(26, 26, 26, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-sm);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
  z-index: 60;
}
/* 用伪元素填补hover间隙，防止鼠标移动时下拉消失 */
.header__nav-item::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 12px;
  background: transparent;
  z-index: 59;
}

.header__dropdown a {
  display: block;
  padding: 10px 18px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--ease-fast);
  border-left: 2px solid transparent;
}
.header__dropdown a:hover {
  color: var(--text-primary);
  background: rgba(184, 115, 51, 0.06);
  border-left-color: var(--copper);
}

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

.header__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 20px;
  background: transparent;
  color: var(--copper);
  font-size: 0.84rem;
  font-weight: 600;
  border: 1px solid var(--border-copper);
  border-radius: var(--radius-sm);
  transition: all var(--ease-normal);
  white-space: nowrap;
}
.header__cta:hover {
  background: var(--copper-dim);
  color: var(--copper-bright);
  border-color: var(--copper);
}

/* ============================================================
   汉堡菜单
   ============================================================ */
.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: 1.5px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: all var(--ease-normal);
}
.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
  background: var(--copper);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
  background: var(--copper);
}

/* 移动端侧滑菜单 */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 80%;
  max-width: 340px;
  background: rgba(17, 17, 17, 0.98);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  z-index: 120;
  transform: translateX(-100%);
  transition: transform var(--ease-normal);
  overflow-y: auto;
  border-right: 1px solid var(--border-thin);
}
.mobile-nav.open { transform: translateX(0); }
.mobile-nav__inner { padding: 24px; padding-top: 80px; }

.mobile-nav__link {
  display: block;
  padding: 14px 16px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--ease-fast);
  border-left: 2px solid transparent;
}
.mobile-nav__link:hover { color: var(--text-primary); border-left-color: var(--copper); }

.mobile-nav__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
}
.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: 0.88rem;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
}
.mobile-nav__sub a:hover { color: var(--text-secondary); border-left-color: var(--copper); }

.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(--ease-normal);
}
.mobile-nav__overlay.show { opacity: 1; pointer-events: auto; }

/* ============================================================
   按钮系统
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--ease-normal);
  white-space: nowrap;
  text-decoration: none;
}

.btn--primary {
  background: var(--copper);
  color: #fff;
}
.btn--primary:hover {
  background: var(--copper-bright);
  box-shadow: 0 0 24px rgba(184, 115, 51, 0.3);
  transform: translateY(-1px);
  color: #fff;
}

.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-copper);
}
.btn--outline:hover {
  border-color: var(--copper);
  background: var(--copper-dim);
  color: var(--copper-bright);
  transform: translateY(-1px);
}

.btn--ghost {
  background: rgba(255,255,255,0.03);
  color: var(--text-secondary);
  border: 1px solid var(--border-thin);
}
.btn--ghost:hover {
  background: rgba(255,255,255,0.06);
  color: var(--text-primary);
  border-color: var(--silver-border);
}

.btn--lg {
  padding: 15px 36px;
  font-size: 1rem;
}

/* ============================================================
   卡片系统 — 深色+铜色细边框
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--ease-normal);
  position: relative;
}

.card:hover {
  border-color: var(--border-copper);
  box-shadow: var(--shadow-copper), 0 4px 20px rgba(0,0,0,0.5);
  transform: translateY(-2px);
}

/* 卡片精密封边效果 */
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid transparent;
  transition: border-color var(--ease-normal);
  pointer-events: none;
  z-index: 0;
}
/* 确保卡片内所有内容在伪元素上方可点击 */
.card > * {
  position: relative;
  z-index: 1;
}
.card:hover::before {
  border-color: rgba(184, 115, 51, 0.2);
}

.card__image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/10;
  background: var(--bg-base);
}
.card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--ease-slow);
}
.card:hover .card__image img { transform: scale(1.03); }

/* 图片未加载占位 */
.card__image-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-base);
  color: var(--text-muted);
  font-size: 2rem;
}

.card__body { padding: 18px 20px; position: relative; z-index: 2; }

.card__tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--copper);
  background: var(--copper-dim);
  border-radius: var(--radius-xs);
  margin-bottom: 8px;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1rem;
  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: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 12px;
}

.card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-thin);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  margin-top: 10px;
  border-top: 1px solid var(--border-thin);
}

/* 产品参数卡片变体 */
.card--product .card__specs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.card--product .card__spec {
  padding: 3px 8px;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--silver);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-xs);
  white-space: nowrap;
}

/* ============================================================
   首页 — Hero Banner
   ============================================================ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 620px;
  max-height: 900px;
  overflow: hidden;
  background: var(--bg-deep);
}

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

.hero__slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* 深色工业遮罩 */
.hero__overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background:
    linear-gradient(180deg, rgba(10,10,10,0.35) 0%, rgba(10,10,10,0.15) 35%, rgba(10,10,10,0.85) 100%);
}

/* 铜色扫描线装饰 */
.hero__scanline {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--copper);
  opacity: 0.3;
  z-index: 3;
  animation: scanlineMove 8s ease-in-out infinite;
}
@keyframes scanlineMove {
  0%, 100% { top: 30%; opacity: 0.15; }
  50% { top: 55%; opacity: 0.4; }
}

.hero__content {
  position: relative;
  z-index: 3;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  padding-top: var(--header-h);
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5.5vw, 3.5rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 1rem;
  max-width: 700px;
  text-shadow: 0 2px 30px rgba(0,0,0,0.5);
}
.hero__title span {
  color: var(--copper);
}

.hero__subtitle {
  font-size: clamp(0.95rem, 1.8vw, 1.15rem);
  color: rgba(255,255,255,0.65);
  margin-bottom: 2rem;
  max-width: 520px;
  font-weight: 300;
  line-height: 1.7;
}

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

/* Hero分页器 */
.hero__pagination {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: 8px;
}
.hero__pagination .swiper-pagination-bullet {
  width: 40px;
  height: 2px;
  border-radius: 0;
  background: rgba(255,255,255,0.3);
  opacity: 1;
  transition: all var(--ease-normal);
}
.hero__pagination .swiper-pagination-bullet-active {
  width: 60px;
  background: var(--copper);
  box-shadow: 0 0 8px var(--copper-glow);
}

/* 滚动指示器 */
.hero__scroll {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  color: rgba(255,255,255,0.3);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  animation: scrollHint 2s ease-in-out infinite;
}
.hero__scroll::after {
  content: '';
  width: 1px;
  height: 24px;
  background: linear-gradient(180deg, var(--copper), transparent);
}
@keyframes scrollHint {
  0%, 100% { opacity: 0.3; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.7; transform: translateX(-50%) translateY(6px); }
}

/* ============================================================
   首页 — 垂直整合三步展示
   ============================================================ */
.integration-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border-thin);
  position: relative;
}
.integration-grid::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--copper);
  opacity: 0.4;
  z-index: 1;
}
.integration-step {
  background: var(--bg-card);
  padding: 48px 32px;
  text-align: center;
  position: relative;
  transition: all var(--ease-normal);
}
.integration-step:hover {
  background: var(--bg-card-hover);
}
.integration-step__num {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 300;
  color: var(--copper);
  opacity: 0.15;
  line-height: 1;
  margin-bottom: -20px;
}
.integration-step__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  border: 1px solid var(--border-copper);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--copper);
  background: var(--copper-dim);
  transition: all var(--ease-normal);
}
.integration-step:hover .integration-step__icon {
  box-shadow: 0 0 20px var(--copper-glow);
  border-color: var(--copper);
}
.integration-step__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.integration-step__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 12px;
}
.integration-step__data {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--copper);
  border: 1px solid var(--border-copper);
  padding: 4px 12px;
  border-radius: var(--radius-xs);
}

/* 步骤连接箭头 */
.integration-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--copper);
  opacity: 0.3;
  font-size: 1.5rem;
}

/* ============================================================
   首页 — 数字指标区
   ============================================================ */
.metrics-section {
  background: var(--bg-card);
  border-top: 1px solid var(--border-thin);
  border-bottom: 1px solid var(--border-thin);
  position: relative;
}
.metrics-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--copper);
  opacity: 0.2;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.metrics-grid .metric-item {
  text-align: center;
  padding: 48px 20px;
  position: relative;
}
.metrics-grid .metric-item + .metric-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 20%;
  bottom: 20%;
  width: 1px;
  background: var(--border-thin);
}

.metric-item__num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  color: #fff;
  line-height: 1;
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}
.metric-item__num .copper {
  color: var(--copper);
  font-weight: 400;
}
.metric-item__label {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ============================================================
   首页 — 智造产线流程
   ============================================================ */
.process-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--border-thin);
}
.process-step {
  background: var(--bg-card);
  padding: 32px 16px;
  text-align: center;
  transition: all var(--ease-normal);
  position: relative;
}
.process-step:hover {
  background: var(--bg-card-hover);
}
.process-step__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--copper);
  width: 24px;
  height: 24px;
  line-height: 24px;
  text-align: center;
  border: 1px solid var(--border-copper);
  border-radius: var(--radius-xs);
  margin: 0 auto 12px;
}
.process-step__icon {
  font-size: 1.5rem;
  color: var(--silver);
  margin-bottom: 10px;
}
.process-step__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.process-step__precision {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--copper);
  opacity: 0.7;
}

/* ============================================================
   首页 — 案例网格
   ============================================================ */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.case-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
  cursor: pointer;
  transition: all var(--ease-normal);
}
.case-item:hover {
  border-color: var(--border-copper);
}
.case-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--ease-slow);
}
.case-item:hover img { transform: scale(1.04); }
.case-item__info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 32px 24px;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  color: #fff;
}
.case-item__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.case-item__sub {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
}

/* ============================================================
   首页 — OEM 铜色模块
   ============================================================ */
.oem-card {
  background: var(--bg-card);
  border: 1px solid var(--border-copper);
  border-radius: var(--radius-md);
  padding: 48px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all var(--ease-normal);
}
.oem-card:hover {
  box-shadow: var(--shadow-copper);
}
.oem-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--copper), transparent);
}
.oem-card__services {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  margin: 24px 0;
}
.oem-card__service {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  padding: 10px 20px;
  border: 1px solid var(--border-copper);
  border-radius: var(--radius-sm);
  transition: all var(--ease-normal);
}
.oem-card__service:hover {
  background: var(--copper-dim);
  color: var(--copper);
}

/* ============================================================
   新闻条目 — 左图右文
   ============================================================ */
.news-item {
  display: flex;
  gap: 20px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-md);
  transition: all var(--ease-normal);
}
.news-item:hover {
  border-color: var(--border-copper);
  background: var(--bg-card-hover);
}
.news-item__thumb {
  width: 200px;
  height: 140px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-base);
}
.news-item__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.news-item__info {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.news-item__date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--copper);
  margin-bottom: 6px;
}
.news-item__title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  transition: color var(--ease-fast);
}
.news-item:hover .news-item__title { color: var(--copper-bright); }
.news-item__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============================================================
   CTA 区块
   ============================================================ */
.cta-section {
  text-align: center;
  padding: 80px 0;
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-copper);
  margin: 0 24px 80px;
  border-radius: var(--radius-md);
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--copper), transparent);
}
.cta-section__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}
.cta-section__tags {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin: 20px 0 28px;
}
.cta-section__tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--silver);
  display: flex;
  align-items: center;
  gap: 6px;
}
.cta-section__tag::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--copper);
  border-radius: 50%;
}

/* ============================================================
   订阅区
   ============================================================ */
.subscribe-card {
  max-width: 520px;
  margin: 0 auto;
  padding: 42px;
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-md);
  text-align: center;
}
.subscribe-form {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}
.subscribe-form input {
  flex: 1;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: border-color var(--ease-fast);
}
.subscribe-form input:focus {
  outline: none;
  border-color: var(--copper);
  box-shadow: 0 0 0 3px var(--copper-dim);
}

/* ============================================================
   内页 Banner
   ============================================================ */
.inner-banner {
  position: relative;
  height: 320px;
  overflow: hidden;
  background: var(--bg-base);
}
.inner-banner__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.inner-banner__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,10,10,0.65) 0%, rgba(10,10,10,0.4) 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(1.6rem, 3.5vw, 2.5rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}
.inner-banner__subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* 面包屑 */
.breadcrumb-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-thin);
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 12px 24px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-secondary); transition: color var(--ease-fast); }
.breadcrumb a:hover { color: var(--copper); }
.breadcrumb i { font-size: 0.6rem; color: var(--text-muted); }

/* ============================================================
   过滤栏（产品/案例列表页子栏目导航）
   ============================================================ */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
  border-bottom: 1px solid var(--border-thin);
  margin-bottom: 36px;
}
.filter-bar::-webkit-scrollbar { display: none; }
.filter-bar a {
  display: inline-flex;
  padding: 7px 16px;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--ease-fast);
}
.filter-bar a:hover,
.filter-bar a.active {
  color: var(--copper);
  border-color: var(--border-copper);
  background: var(--copper-dim);
}

/* ============================================================
   列表网格
   ============================================================ */
.list-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.list-grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

.list-header {
  text-align: center;
  margin-bottom: 42px;
}
.list-header h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 0.5rem;
}

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

.detail-gallery {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 36px;
  background: var(--bg-base);
}
.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-thin);
}
.detail__title {
  font-size: clamp(1.3rem, 2.5vw, 1.85rem);
  margin-bottom: 10px;
}
.detail__meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.detail__meta-row i { margin-right: 4px; color: var(--copper); }

/* 产品参数卡片 */
.detail__params {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 8px;
  margin-bottom: 32px;
}
.detail__param {
  padding: 14px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-sm);
  text-align: center;
  transition: all var(--ease-fast);
}
.detail__param:hover {
  border-color: var(--border-copper);
}
.detail__param-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  letter-spacing: 0.05em;
}
.detail__param-value {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}
.detail__param-value.copper {
  color: var(--copper);
}

/* 正文内容 */
.detail__body {
  color: var(--text-secondary);
  line-height: 1.9;
  font-size: 0.93rem;
}
.detail__body img {
  border-radius: var(--radius-sm);
  margin: 24px 0;
  max-width: 100%;
}
.detail__body p { margin-bottom: 16px; }
.detail__body h2, .detail__body h3, .detail__body h4 {
  color: var(--text-primary);
  margin-top: 32px;
  margin-bottom: 14px;
  font-family: var(--font-heading);
}

/* Tab 切换 (产品详情页) */
.detail-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-thin);
  margin-bottom: 28px;
  gap: 0;
}
.detail-tab-btn {
  padding: 12px 22px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all var(--ease-fast);
}
.detail-tab-btn:hover { color: var(--text-secondary); }
.detail-tab-btn.active {
  color: var(--copper);
  border-bottom-color: var(--copper);
}
.tab-panel { display: block; }
.tab-panel.hidden { display: none; }

/* 上下篇导航 */
.detail__pager {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--border-thin);
  font-size: 0.85rem;
  color: var(--text-muted);
}
.detail__pager a {
  color: var(--text-secondary);
  transition: color var(--ease-fast);
}
.detail__pager a:hover { color: var(--copper); }

/* 相关推荐 */
.related-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 52px 0 20px;
  color: var(--text-primary);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* ============================================================
   单页内容（关于/智造/参数/OEM/联系）
   ============================================================ */
.page-content {
  max-width: 860px;
  margin: 0 auto;
}

/* 关于我们 — 技术路线 */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 60px;
}
.about-intro__image {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
}
.about-intro__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* R&D 卡片 */
.rd-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 32px 0;
}
.rd-card {
  padding: 28px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-sm);
  text-align: center;
  transition: all var(--ease-normal);
}
.rd-card:hover { border-color: var(--border-copper); }
.rd-card__icon {
  font-size: 1.8rem;
  color: var(--copper);
  margin-bottom: 12px;
}
.rd-card__title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

/* 产线全流程 */
.production-flow {
  position: relative;
}
.production-phase {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 36px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border-thin);
  align-items: center;
}
.production-phase:last-child { border-bottom: none; }
.production-phase__image {
  aspect-ratio: 16/10;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
}
.production-phase__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.production-phase__title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.production-phase__precision {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--copper);
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid var(--border-copper);
  border-radius: var(--radius-xs);
  margin-bottom: 10px;
}

/* 参数表 */
.specs-table {
  width: 100%;
  border-collapse: collapse;
}
.specs-table tr {
  border-bottom: 1px solid var(--border-thin);
}
.specs-table tr:hover {
  background: var(--bg-card);
}
.specs-table td {
  padding: 14px 18px;
  font-size: 0.9rem;
}
.specs-table td:first-child {
  color: var(--text-secondary);
  width: 200px;
  font-weight: 500;
}
.specs-table td:last-child {
  color: var(--text-primary);
  font-family: var(--font-mono);
}

/* 联系我们 */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  transition: all var(--ease-fast);
}
.contact-info-item:hover { border-color: var(--border-copper); }
.contact-info-item__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--copper-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--copper);
  flex-shrink: 0;
}
.contact-info-item__label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.contact-info-item__value {
  font-size: 0.9rem;
  color: var(--text-primary);
}

/* 表单 */
.form-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-md);
}
.form-group {
  margin-bottom: 16px;
}
.form-group label {
  display: block;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 5px;
  font-weight: 500;
}
.form-group .required { color: var(--copper); }
.form-control {
  width: 100%;
  padding: 12px 15px;
  background: var(--bg-input);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all var(--ease-fast);
}
.form-control:focus {
  outline: none;
  border-color: var(--copper);
  box-shadow: 0 0 0 3px var(--copper-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='%23606060' 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
   ============================================================ */
.search-box {
  max-width: 640px;
  margin: 0 auto;
}
.search-form-row {
  display: flex;
  gap: 10px;
}
.search-form-row input {
  flex: 1;
  padding: 14px 18px;
  padding-left: 44px;
  background: var(--bg-input);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.93rem;
}
.search-form-row input:focus {
  outline: none;
  border-color: var(--copper);
  box-shadow: 0 0 0 3px var(--copper-dim);
}
.search-input-wrap {
  position: relative;
  flex: 1;
}
.search-input-wrap i {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.search-result-item {
  display: flex;
  gap: 16px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-sm);
  transition: all var(--ease-fast);
  margin-bottom: 8px;
}
.search-result-item:hover { border-color: var(--border-copper); }
.search-result-item__thumb {
  width: 100px;
  height: 75px;
  border-radius: var(--radius-xs);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--bg-base);
}
.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-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.search-result-item__date {
  font-size: 0.75rem;
  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: 3px;
  margin-top: 44px;
}
.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  padding: 0 6px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-sm);
  transition: all var(--ease-fast);
  font-family: var(--font-mono);
}
.pagination a:hover {
  border-color: var(--border-copper);
  color: var(--copper);
  background: var(--copper-dim);
}
.pagination .active {
  background: var(--copper);
  color: #fff;
  border-color: var(--copper);
  font-weight: 600;
}

/* ============================================================
   空状态
   ============================================================ */
.empty-state {
  text-align: center;
  padding: 60px 20px;
}
.empty-state i {
  font-size: 2.5rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  display: block;
  opacity: 0.3;
}
.empty-state p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ============================================================
   Footer 底部
   ============================================================ */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-thin);
}
.footer__top-accent {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--copper), transparent);
  opacity: 0.4;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 36px;
  padding: 56px 0 36px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.footer__brand-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 14px 0;
}
.footer__social {
  display: flex;
  gap: 8px;
}
.footer__social a {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-thin);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: all var(--ease-fast);
}
.footer__social a:hover {
  border-color: var(--copper);
  color: var(--copper);
  background: var(--copper-dim);
}

.footer__col-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
}
.footer__links { display: flex; flex-direction: column; gap: 8px; }
.footer__links a {
  font-size: 0.84rem;
  color: var(--text-secondary);
  transition: color var(--ease-fast);
}
.footer__links a:hover { color: var(--copper); }

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.footer__contact-item i { color: var(--copper); margin-top: 3px; flex-shrink: 0; }

.footer__qrcode {
  width: 100px;
  height: 100px;
  background: #fff;
  border-radius: var(--radius-sm);
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  color: #999;
  text-align: center;
  line-height: 1.4;
}

/* 友情链接 */
.friend-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  padding: 14px 0;
  border-top: 1px solid var(--border-thin);
}
.friend-links__label {
  font-size: 0.78rem;
  color: var(--text-muted);
  flex-shrink: 0;
}
.friend-links a {
  font-size: 0.78rem;
  color: var(--text-muted);
  transition: color var(--ease-fast);
}
.friend-links a:hover { color: var(--copper); }

.footer__bottom {
  border-top: 1px solid var(--border-thin);
  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(--text-muted);
  flex-wrap: wrap;
  gap: 8px;
}
.footer__bottom a { color: var(--text-muted); transition: color var(--ease-fast); }
.footer__bottom a:hover { color: var(--copper); }

/* ============================================================
   返回顶部
   ============================================================ */
.back-top {
  position: fixed;
  right: 16px;
  bottom: 72px;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-thin);
  color: var(--text-muted);
  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(--ease-normal);
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover {
  border-color: var(--copper);
  color: var(--copper);
  background: var(--bg-card-hover);
}

/* ============================================================
   AOS 覆盖
   ============================================================ */
[data-aos] {
  transition-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================================================
   动画
   ============================================================ */

/* 铜色光晕脉冲 */
@keyframes copperPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(184, 115, 51, 0.3); }
  70% { box-shadow: 0 0 0 10px rgba(184, 115, 51, 0); }
}
.btn--primary.pulse {
  animation: copperPulse 2s infinite;
}

/* 精密扫描线 */
@keyframes precisionScan {
  0% { width: 0; left: 0; }
  50% { width: 100%; left: 0; }
  100% { width: 0; left: 100%; }
}

/* 数字浮现 */
@keyframes numberReveal {
  0% { opacity: 0; transform: translateY(10px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* 边框微光 */
@keyframes borderGlow {
  0%, 100% { border-color: rgba(184, 115, 51, 0.15); }
  50% { border-color: rgba(184, 115, 51, 0.35); }
}

/* Hover 铜色光效 */
.card--glow:hover {
  animation: borderGlow 1.5s ease-in-out infinite;
}

/* 淡入上移 */
@keyframes fadeInUp {
  0% { opacity: 0; transform: translateY(24px); }
  100% { opacity: 1; transform: translateY(0); }
}
.anim-fade-up {
  animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* ============================================================
   响应式 — 平板 (768px-1023px)
   ============================================================ */
@media (max-width: 1023px) {
  :root { --section-py: 64px; --section-py-sm: 40px; }

  .header__nav,
  .header__actions {
    display: none;
  }
  .hamburger { display: flex; }

  .hero { height: 80vh; min-height: 480px; }

  .integration-grid { grid-template-columns: 1fr; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(3, 1fr); }
  .case-grid { grid-template-columns: 1fr; }
  .list-grid { grid-template-columns: repeat(2, 1fr); }
  .list-grid--4 { grid-template-columns: repeat(2, 1fr); }

  .about-intro { grid-template-columns: 1fr; gap: 28px; }
  .contact-grid { grid-template-columns: 1fr; }
  .production-phase { grid-template-columns: 1fr; gap: 16px; }
  .rd-grid { grid-template-columns: repeat(2, 1fr); }

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

  .news-item { flex-direction: column; }
  .news-item__thumb { width: 100%; height: 180px; }

  .cta-section { margin: 0 16px 60px; }
  .subscribe-form { flex-direction: column; }

  .detail__pager { flex-direction: column; gap: 8px; text-align: center; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   响应式 — 移动端 (< 768px)
   ============================================================ */
@media (max-width: 767px) {
  :root { --section-py: 48px; --section-py-sm: 32px; }

  .hero {
    height: 85vh;
    min-height: 440px;
  }
  .hero__content { padding-top: 60px; }
  .hero__scroll { display: none; }

  .inner-banner { height: 220px; }

  .integration-grid { grid-template-columns: 1fr; }
  .integration-step { padding: 32px 22px; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .metrics-grid .metric-item { padding: 28px 14px; }
  .metrics-grid .metric-item + .metric-item::before { display: none; }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .list-grid { grid-template-columns: 1fr; }
  .list-grid--4 { grid-template-columns: 1fr; }
  .rd-grid { grid-template-columns: 1fr; }

  .footer__grid { grid-template-columns: 1fr; gap: 28px; }
  .footer__bottom-inner { flex-direction: column; text-align: center; }

  .card__body { padding: 14px 16px; }
  .subscribe-card { padding: 24px 18px; }
  .cta-section { margin: 0 12px 48px; padding: 40px 20px; }

  .detail__params { grid-template-columns: repeat(2, 1fr); }
  .related-grid { grid-template-columns: 1fr; }
  .search-result-item { flex-direction: column; }
  .search-result-item__thumb { width: 100%; height: 140px; }

  .back-top { right: 10px; bottom: 50px; }
  .form-card { padding: 20px 16px; }

  .oem-card { padding: 32px 20px; }
  .oem-card__services { gap: 12px; }
  .oem-card__service { font-size: 0.85rem; padding: 8px 14px; }

  .detail-tabs { overflow-x: auto; }
  .detail-tab-btn { white-space: nowrap; }
}

/* ============================================================
   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;
  }
}