/* ==========================================================================
   鑫圣达智能装备 · 官网模板 公共样式
   主题体系：4 套主题（暗色科技 / 浅蓝科技 / 纯白简约 / 浅灰工业）
            通过 <html data-theme="..."> 切换，全部颜色走 CSS 变量。
   说明：本文件被全部 12 个页面引用，请勿删除或重命名。
   ========================================================================== */

/* ==========================================================================
   主题变量
   ========================================================================== */
:root,
html[data-theme="dark"] {
  --radius: 14px;
  --header-h: 76px;
  --primary: #1E6BFF;
  --primary-light: #4F8BFF;
  --primary-dark: #0B3D91;
  --accent: #00D4FF;
  --bg-body: #0B1020;
  --bg-alt: #0a1026;
  --bg-deep: #070a1a;
  --bg-card: #121A33;
  --bg-card-hover: #182247;
  --bg-input: rgba(11, 16, 32, .7);
  --text: #E6ECFF;
  --text-muted: #8A93B7;
  --heading: #FFFFFF;
  --border: rgba(79, 139, 255, 0.18);
  --shadow: 0 10px 30px rgba(0, 40, 120, 0.35);
  --header-bg: rgba(11, 16, 32, 0.88);
  --menu-bg: rgba(11, 16, 32, .98);
  --footer-bg: #070a1a;
  --qrcode-bg: #ffffff;
  --qrcode-color: #000000;
  --btn-outline-text: #ffffff;
  --btn-outline-border: rgba(255, 255, 255, .35);
  --btn-outline-hover: rgba(255, 255, 255, .08);
  --hero-overlay: linear-gradient(110deg, rgba(11,16,32,.92) 0%, rgba(11,16,32,.55) 55%, rgba(11,16,32,.25) 100%);
  --fade-color: rgba(11,16,32,.95);
  --hero-title-from: #ffffff;
  --hero-title-to: #9fc1ff;
  --hero-sub: rgba(255, 255, 255, .78);
}

html[data-theme="light-blue"] {
  --primary: #1E6BFF;
  --primary-light: #2E7BFF;
  --primary-dark: #0B3D91;
  --accent: #0099E8;
  --bg-body: linear-gradient(180deg, #EAF2FF 0%, #F7FAFF 100%);
  --bg-alt: #E3EDFC;
  --bg-deep: #DFEAFF;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F2F7FF;
  --bg-input: #F3F7FE;
  --text: #22334F;
  --text-muted: #5D6F92;
  --heading: #0E1F3D;
  --border: rgba(30, 107, 255, 0.16);
  --shadow: 0 10px 28px rgba(30, 107, 255, 0.12);
  --header-bg: rgba(255, 255, 255, 0.85);
  --menu-bg: rgba(255, 255, 255, .98);
  --footer-bg: #E3EDFC;
  --qrcode-bg: #F3F7FE;
  --qrcode-color: #22334F;
  --btn-outline-text: #1E6BFF;
  --btn-outline-border: rgba(30, 107, 255, .45);
  --btn-outline-hover: rgba(30, 107, 255, .08);
  --hero-overlay: linear-gradient(110deg, rgba(11,16,32,.86) 0%, rgba(11,16,32,.5) 55%, rgba(11,16,32,.18) 100%);
  --fade-color: rgba(11,16,32,.95);
  --hero-title-from: #ffffff;
  --hero-title-to: #bfd6ff;
  --hero-sub: rgba(255, 255, 255, .82);
}


/* ==========================================================================
   基础
   ========================================================================== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-body);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { font-family: inherit; }

.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   图标（内联 SVG 通用样式）
   ========================================================================== */
.icon {
  width: 24px; height: 24px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* ==========================================================================
   头部 / 导航
   ========================================================================== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s ease, background-color .3s ease;
}
.header.scrolled { box-shadow: var(--shadow); }
.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--header-h);
}
.logo {
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--heading);
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}
.logo-mark {
  width: 36px; height: 36px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 0 16px rgba(30, 107, 255, .35);
}
.nav { display: flex; gap: 20px; }
.nav a {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
  transition: color .25s ease;
  position: relative;
  padding: 4px 0;
  white-space: nowrap;
}
.nav a:hover, .nav a.active { color: var(--primary-light); }
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -4px;
  width: 0; height: 2px;
  background: var(--primary-light);
  transition: width .3s ease;
}
.nav a:hover::after, .nav a.active::after { width: 100%; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 6px;
}
.hamburger span {
  width: 28px; height: 3px;
  background: var(--heading);
  border-radius: 2px;
  transition: .3s ease;
}
.hamburger.open span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

.mobile-menu {
  display: none;
  background: var(--menu-bg);
  border-top: 1px solid var(--border);
  padding: 12px 0 24px;
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block;
  padding: 13px 24px;
  color: var(--text-muted);
  font-size: 16px;
  border-bottom: 1px solid var(--border);
}
.mobile-menu a:hover, .mobile-menu a.active { color: var(--primary-light); background: rgba(30, 107, 255, .06); }

/* ==========================================================================
   主题切换按钮 / 下拉面板
   ========================================================================== */
.theme-box { position: relative; margin-left: 8px; flex-shrink: 0; }
.theme-btn {
  width: 42px; height: 42px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all .3s ease;
}
.theme-btn:hover { border-color: var(--primary-light); color: var(--primary-light); }
.theme-btn .icon { width: 20px; height: 20px; }
.theme-btn .icon-sun { display: block; }
.theme-btn .icon-moon { display: none; }
html[data-theme="light-blue"] .theme-btn .icon-sun { display: none; }
html[data-theme="light-blue"] .theme-btn .icon-moon { display: block; }

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 15px;
  transition: all .3s ease;
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
}
.btn-primary {
  background: linear-gradient(120deg, var(--primary), var(--primary-light));
  color: #fff;
  box-shadow: 0 10px 24px rgba(30, 107, 255, .35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 16px 32px rgba(30, 107, 255, .5); }
.btn-outline {
  background: transparent;
  color: var(--btn-outline-text);
  border: 1px solid var(--btn-outline-border);
}
.btn-outline:hover { background: var(--btn-outline-hover); border-color: var(--primary-light); }
.btn-block { width: 100%; }

/* ==========================================================================
   首页 Hero 轮播
   ========================================================================== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 640px;
  overflow: hidden;
  margin-top: var(--header-h);
  display: flex;
  align-items: center;
}
.slides {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1s ease-in-out;
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.slide.active { opacity: 1; }
.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--hero-overlay);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 3;
  width: 100%;
  max-width: 780px;
  padding: 60px 0 0;
}
.hero-tag {
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid var(--primary-light);
  border-radius: 999px;
  color: var(--primary-light);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 24px;
  width: fit-content;
}
.hero h1 {
  font-size: 54px;
  line-height: 1.15;
  font-weight: 800;
  margin-bottom: 24px;
  background: linear-gradient(120deg, var(--hero-title-from) 0%, var(--hero-title-to) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p {
  font-size: 18px;
  color: var(--hero-sub);
  margin-bottom: 36px;
  max-width: 640px;
}
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-indicators {
  position: absolute;
  bottom: 40px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 12px;
  z-index: 4;
}
.dot {
  width: 40px; height: 4px;
  background: rgba(255, 255, 255, .25);
  border-radius: 2px;
  cursor: pointer;
  transition: background .3s ease;
}
.dot.active { background: var(--primary-light); }

/* 幻灯片左右两侧渐隐（融入页面背景色） */
.hero-fade {
  position: absolute;
  top: 0;
  bottom: 0;
  width: min(16vw, 240px);
  z-index: 2;
  pointer-events: none;
}
.hero-fade.l { left: 0; background: linear-gradient(90deg, var(--fade-color) 0%, transparent 100%); }
.hero-fade.r { right: 0; background: linear-gradient(270deg, var(--fade-color) 0%, transparent 100%); }

/* ==========================================================================
   内页标题横幅
   ========================================================================== */
.page-hero {
  position: relative;
  margin-top: var(--header-h);
  padding: 92px 0 84px;
  background:
    linear-gradient(110deg, rgba(11, 16, 32, .9) 0%, rgba(11, 16, 32, .55) 60%, rgba(11, 16, 32, .35) 100%),
    var(--page-bg, url('../assets/hero-2.jpg')) center / cover no-repeat;
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.page-hero h1 {
  font-size: 40px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}
.page-hero .breadcrumb {
  color: rgba(255, 255, 255, .7);
  font-size: 14px;
}
.page-hero .breadcrumb a:hover { color: var(--primary-light); }
.page-hero .breadcrumb .sep { margin: 0 8px; color: rgba(255, 255, 255, .35); }
.page-hero .breadcrumb .cur { color: var(--primary-light); }

/* ==========================================================================
   区块通用
   ========================================================================== */
.section { padding: 96px 0; }
.section.alt { background: var(--bg-alt); }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head.left { text-align: left; }
.section-tag {
  color: var(--primary-light);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--heading);
}
.section-desc {
  max-width: 720px;
  margin: 0 auto;
  color: var(--text-muted);
  font-size: 16px;
}
.section-head.left .section-desc { margin: 0; }
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }
.mb-40 { margin-bottom: 40px; }

/* ==========================================================================
   核心能力卡片
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 26px;
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: linear-gradient(180deg, var(--primary-light), var(--accent));
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .35s ease;
}
.feature-card:hover { background: var(--bg-card-hover); transform: translateY(-6px); box-shadow: var(--shadow); }
.feature-card:hover::before { transform: scaleY(1); }
.feature-icon {
  width: 54px; height: 54px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(30, 107, 255, .2), rgba(0, 212, 255, .15));
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary-light);
}
.feature-card h3 { font-size: 19px; margin-bottom: 10px; color: var(--heading); }
.feature-card p { color: var(--text-muted); font-size: 14px; }

/* ==========================================================================
   数据统计条
   ========================================================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.stat-item {
  text-align: center;
  padding: 30px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.stat-num {
  font-size: 40px;
  font-weight: 800;
  color: var(--primary-light);
  line-height: 1.2;
}
.stat-num em { font-style: normal; font-size: 24px; }
.stat-label { color: var(--text-muted); font-size: 14px; margin-top: 6px; }

/* ==========================================================================
   产品卡片
   ========================================================================== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: all .35s ease;
  display: flex;
  flex-direction: column;
}
.product-card:hover { transform: translateY(-8px); box-shadow: var(--shadow); border-color: var(--primary-light); }
.product-img {
  height: 220px;
  background-size: cover;
  background-position: center;
  position: relative;
}
.product-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(11, 16, 32, .9) 100%);
}
.product-cat {
  position: absolute;
  left: 16px; top: 16px;
  z-index: 1;
  padding: 4px 12px;
  background: rgba(30, 107, 255, .9);
  color: #fff;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}
.product-body { padding: 24px; display: flex; flex-direction: column; flex: 1; }
.product-body h3 { font-size: 21px; margin-bottom: 10px; color: var(--heading); }
.product-body p { color: var(--text-muted); font-size: 14px; margin-bottom: 18px; flex: 1; }
.product-link {
  color: var(--primary-light);
  font-weight: 700;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.product-link:hover { gap: 14px; }

/* ==========================================================================
   案例卡片
   ========================================================================== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.case-card {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  height: 320px;
  border: 1px solid var(--border);
  display: block;
  transition: transform .35s ease;
}
.case-card:hover { transform: translateY(-6px); }
.case-card img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.case-card:hover img { transform: scale(1.08); }
.case-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 16, 32, .1) 40%, rgba(11, 16, 32, .94) 100%);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.case-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary);
  color: #fff;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  width: fit-content;
  margin-bottom: 14px;
}
.case-overlay h3 { font-size: 21px; color: #fff; margin-bottom: 8px; }
.case-overlay p { color: rgba(255, 255, 255, .75); font-size: 14px; }

/* ==========================================================================
   新闻卡片
   ========================================================================== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all .3s ease;
  display: flex;
  flex-direction: column;
}
.news-card:hover { background: var(--bg-card-hover); transform: translateY(-4px); box-shadow: var(--shadow); }
.news-img { height: 190px; background-size: cover; background-position: center; }
.news-body { padding: 22px; display: flex; flex-direction: column; flex: 1; }
.news-date { color: var(--primary-light); font-size: 13px; font-weight: 700; margin-bottom: 10px; }
.news-body h3 { font-size: 18px; margin-bottom: 10px; color: var(--heading); line-height: 1.5; }
.news-body h3 a:hover { color: var(--primary-light); }
.news-body p { color: var(--text-muted); font-size: 14px; flex: 1; }

/* 新闻筛选 tab */
.tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 9px 22px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 999px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all .3s ease;
}
.tab-btn:hover { color: var(--heading); border-color: var(--primary-light); }
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ==========================================================================
   招聘
   ========================================================================== */
.career-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.career-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  transition: all .3s ease;
}
.career-item:hover { background: var(--bg-card-hover); border-color: var(--primary-light); }
.career-item h3 { font-size: 19px; color: var(--heading); margin-bottom: 8px; }
.career-item p { color: var(--text-muted); font-size: 14px; }
.career-meta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 10px; }
.career-meta span {
  font-size: 12px;
  color: var(--text-muted);
  background: rgba(30, 107, 255, .12);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: 999px;
}
.salary {
  color: var(--accent);
  font-weight: 800;
  font-size: 19px;
  white-space: nowrap;
}
.career-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 40px;
}
.career-note a { color: var(--primary-light); }

/* ==========================================================================
   合作 / 支持卡片
   ========================================================================== */
.coop-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.coop-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 38px 28px;
  text-align: center;
  transition: all .35s ease;
}
.coop-card:hover { transform: translateY(-6px); background: var(--bg-card-hover); box-shadow: var(--shadow); }
.coop-icon {
  width: 68px; height: 68px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(30, 107, 255, .25), rgba(0, 212, 255, .18));
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 22px;
  color: var(--primary-light);
}
.coop-card h3 { font-size: 21px; margin-bottom: 12px; color: var(--heading); }
.coop-card p { color: var(--text-muted); font-size: 14px; }

/* 合作流程（时间轴风格） */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.step-item {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 24px;
}
.step-num {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-weight: 800;
  font-size: 17px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.step-item h3 { font-size: 18px; color: var(--heading); margin-bottom: 8px; }
.step-item p { color: var(--text-muted); font-size: 14px; }

/* ==========================================================================
   关于页：两栏
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-img {
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.about-text h2 { font-size: 34px; margin-bottom: 20px; color: var(--heading); }
.about-text p { color: var(--text-muted); margin-bottom: 16px; }
.about-list {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.about-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 15px;
}
.check {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: rgba(30, 107, 255, .18);
  color: var(--primary-light);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* 时间轴（发展历程） */
.timeline { max-width: 860px; margin: 0 auto; }
.tl-row {
  display: grid;
  grid-template-columns: 130px 60px 1fr;
  gap: 0;
}
.tl-year {
  text-align: right;
  color: var(--primary-light);
  font-weight: 800;
  font-size: 18px;
  padding: 0 20px 36px 0;
}
.tl-axis { position: relative; }
.tl-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--primary-light);
  border: 3px solid var(--bg-body);
  box-shadow: 0 0 0 2px var(--primary-light);
  position: absolute;
  left: 50%;
  top: 6px;
  transform: translateX(-50%);
}
.tl-line {
  position: absolute;
  left: 50%;
  top: 22px;
  bottom: 0;
  width: 2px;
  background: var(--border);
  transform: translateX(-50%);
}
.tl-row:last-child .tl-line { display: none; }
.tl-content { padding: 0 0 36px 20px; }
.tl-content h3 { color: var(--heading); font-size: 18px; margin-bottom: 6px; }
.tl-content p { color: var(--text-muted); font-size: 14px; }

/* ==========================================================================
   详情页通用（文章容器）
   ========================================================================== */
.article-wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
}
.article-title { font-size: 30px; color: var(--heading); margin-bottom: 12px; line-height: 1.4; }
.article-meta {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.article-content p { margin-bottom: 18px; color: var(--text); font-size: 16px; line-height: 1.9; }
.article-content h3 { margin: 30px 0 12px; color: var(--heading); font-size: 22px; }
.article-content h4 { margin: 24px 0 10px; color: var(--heading); font-size: 18px; }
.article-content ul { margin: 0 0 18px; padding-left: 4px; }
.article-content ul li {
  position: relative;
  padding-left: 22px;
  color: var(--text);
  font-size: 15px;
  margin-bottom: 8px;
}
.article-content ul li::before {
  content: "";
  position: absolute;
  left: 4px; top: 10px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--primary-light);
}
.article-img {
  border-radius: 12px;
  overflow: hidden;
  margin: 24px 0;
  border: 1px solid var(--border);
}
.article-img figcaption {
  padding: 10px 14px;
  color: var(--text-muted);
  font-size: 13px;
  background: var(--bg-deep);
}

/* ==========================================================================
   产品详情
   ========================================================================== */
.pd-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 44px;
  align-items: start;
}
.pd-gallery {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.pd-info h1 { font-size: 32px; color: var(--heading); margin-bottom: 12px; }
.pd-info .pd-sub { color: var(--primary-light); font-size: 14px; font-weight: 700; letter-spacing: 1px; margin-bottom: 16px; }
.pd-info .pd-desc { color: var(--text-muted); margin-bottom: 24px; }
.pd-params { width: 100%; border-collapse: collapse; margin-bottom: 26px; }
.pd-params th, .pd-params td {
  text-align: left;
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.pd-params th { color: var(--primary-light); font-weight: 700; width: 34%; white-space: nowrap; }
.pd-params td { color: var(--text); }
.pd-contact {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.pd-contact .btn { padding: 11px 24px; }
.pd-contact span { color: var(--text-muted); font-size: 14px; }

/* ==========================================================================
   联系页 / 表单
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
}
.contact-info h3 { font-size: 28px; margin-bottom: 16px; color: var(--heading); }
.contact-info p { color: var(--text-muted); margin-bottom: 28px; }
.info-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
  color: var(--text);
}
.info-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: rgba(30, 107, 255, .15);
  color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.info-list strong { display: block; color: var(--heading); margin-bottom: 4px; font-size: 15px; }
.info-list span { color: var(--text-muted); font-size: 14px; }

.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 38px;
  box-shadow: var(--shadow);
}
.form-card h3 { font-size: 23px; margin-bottom: 22px; color: var(--heading); }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 18px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 13px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  transition: border-color .25s ease;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-light);
}
.form-group textarea { min-height: 130px; resize: vertical; }
.submit-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(120deg, var(--primary), var(--primary-light));
  color: #fff;
  border: none;
  border-radius: 10px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  transition: all .3s ease;
}
.submit-btn:hover { box-shadow: 0 14px 28px rgba(30, 107, 255, .4); transform: translateY(-2px); }

/* 地图占位（联系页） */
.map-placeholder {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 10px;
  color: var(--text-muted);
  background:
    repeating-linear-gradient(45deg, rgba(30, 107, 255, .05) 0 14px, transparent 14px 28px),
    var(--bg-card);
}
.map-placeholder strong { color: var(--text); font-size: 16px; }
.map-placeholder span { font-size: 13px; }

/* ==========================================================================
   页脚
   ========================================================================== */
.footer {
  background: var(--footer-bg);
  border-top: 1px solid var(--border);
  padding: 72px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 0.9fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-about .logo { margin-bottom: 18px; }
.footer-about p { color: var(--text-muted); font-size: 14px; margin-bottom: 20px; max-width: 300px; }
.footer h4 {
  color: var(--heading);
  font-size: 16px;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}
.footer h4::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 30px; height: 2px;
  background: var(--primary-light);
}
.footer-links li { margin-bottom: 11px; }
.footer-links a { color: var(--text-muted); font-size: 14px; transition: color .25s ease; }
.footer-links a:hover { color: var(--primary-light); }
.footer-contact li {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 12px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.footer-contact a:hover { color: var(--primary-light); }
.qrcode {
  width: 104px; height: 104px;
  background: var(--qrcode-bg);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--qrcode-color);
  font-weight: 700;
  font-size: 12px;
  text-align: center;
  margin-bottom: 12px;
  line-height: 1.5;
  border: 1px solid var(--border);
}
.copyright {
  text-align: center;
  padding-top: 26px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.9;
}

/* ==========================================================================
   返回顶部 / Toast
   ========================================================================== */
.back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  width: 46px; height: 46px;
  background: var(--primary);
  color: #fff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all .3s ease;
  z-index: 99;
  box-shadow: var(--shadow);
  border: none;
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--primary-light); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 40px;
  transform: translateX(-50%) translateY(20px);
  background: var(--primary);
  color: #fff;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
  visibility: hidden;
  transition: all .35s ease;
  z-index: 200;
  box-shadow: var(--shadow);
  white-space: nowrap;
}
.toast.show { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }

/* ==========================================================================
   主题切换特效
   ========================================================================== */
/* 特效1：颜色平滑过渡（切换瞬间全局过渡） */
html.theme-anim *,
html.theme-anim *::before,
html.theme-anim *::after {
  transition: background-color .45s ease, border-color .45s ease,
              color .45s ease, box-shadow .45s ease,
              fill .45s ease, stroke .45s ease !important;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1100px) {
  .nav { gap: 14px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 992px) {
  .products-grid, .cases-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .coop-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 44px; }
  .section-title { font-size: 32px; }
  .about-grid, .pd-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  .nav { display: none; }
  .hamburger { display: flex; }

  .hero { height: 88vh; min-height: 540px; }
  .hero h1 { font-size: 32px; }
  .hero p { font-size: 16px; }

  .page-hero { padding: 64px 0 56px; }
  .page-hero h1 { font-size: 30px; }

  .section { padding: 72px 0; }
  .section-title { font-size: 26px; }

  .features-grid, .products-grid, .cases-grid, .news-grid,
  .coop-grid, .steps-grid, .career-list { grid-template-columns: 1fr; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stat-num { font-size: 30px; }

  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-list { grid-template-columns: 1fr; }

  .form-row { grid-template-columns: 1fr; }
  .form-card { padding: 28px 20px; }
  .article-wrap { padding: 24px 20px; }
  .article-title { font-size: 24px; }

  .tl-row { grid-template-columns: 80px 40px 1fr; }
  .tl-year { font-size: 15px; padding-right: 14px; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .career-item { flex-direction: column; align-items: flex-start; gap: 12px; }

}

@media (max-width: 480px) {
  .hero-buttons { flex-direction: column; }
  .btn { width: 100%; }
  .container { padding: 0 18px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}