/* ============================================
   QIPUSEMI Website Design System
   科技蓝 · 硬核工业风
   ============================================ */

/* ---- CSS Variables ---- */
:root {
  /* Brand Colors · V2.0 (2026-08-31 升级到品牌手册定稿色) */
  --bg-dark: #0A2540;
  --bg-darker: #061A2E;
  --bg-light: #F5F7FA;
  --bg-white: #FFFFFF;
  --primary: #1565C0;
  --primary-light: #1E88E5;
  --accent: #00B4D8;
  --accent-glow: #00D9F0;
  --gold: #D4AF37;  /* 品牌最终未启用金色，本地变量保留作 legacy 兼容；UI 上不应再使用 */
  --gold-soft: #E8C558;  /* legacy */

  /* Text */
  --text-light: #E0E6ED;
  --text-light-muted: #8A9BAE;
  --text-dark: #1A1A2E;
  --text-dark-muted: #5A6A7E;
  --text-white: #FFFFFF;

  /* Borders & Effects */
  --border-dark: rgba(0, 188, 212, 0.15);
  --border-dark-strong: rgba(0, 188, 212, 0.3);
  --border-light: rgba(10, 31, 61, 0.1);
  --shadow-card: 0 4px 24px rgba(10, 31, 61, 0.08);
  --shadow-card-hover: 0 8px 40px rgba(10, 31, 61, 0.15);
  --shadow-glow: 0 0 30px rgba(0, 188, 212, 0.15);

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;
  --radius: 4px;
  --radius-lg: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Reset ---- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Chakra Petch', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-white);
  color: var(--text-dark);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ---- Typography ---- */
h1, h2, h3, h4 {
  font-family: 'Chakra Petch', 'Noto Sans SC', sans-serif;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.5px;
}

.section-title {
  font-size: 2.4rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  position: relative;
}

.section-title .accent { color: var(--accent); }

.section-subtitle {
  font-size: 1rem;
  color: var(--text-dark-muted);
  letter-spacing: 1px;
  margin-bottom: 48px;
  text-transform: uppercase;
}

.section-title.light { color: var(--text-light); }
.section-subtitle.light { color: var(--text-light-muted); }

/* ---- Layout Helpers ---- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

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

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

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

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

/* ---- Tech Grid Background ---- */
.tech-grid-bg {
  position: relative;
  background: var(--bg-dark);
}

.tech-grid-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 188, 212, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 188, 212, 0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
}

.tech-grid-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 50%, transparent 0%, var(--bg-dark) 70%);
  pointer-events: none;
}

/* ---- Navigation ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(6, 21, 37, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-dark);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(6, 21, 37, 0.95);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-inner {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo (SVG text logo - 方案A) */
.nav-logo {
  display: flex;
  align-items: center;
  color: var(--text-white);
  text-decoration: none;
}

.nav-logo .logo-svg {
  height: 36px;
  width: auto;
  display: block;
}

/* Nav Menu */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-light-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  position: relative;
  transition: var(--transition);
  cursor: pointer;
}

.nav-link:hover, .nav-link.active {
  color: var(--accent);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

/* Language Toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border: 1px solid var(--border-dark-strong);
  border-radius: var(--radius);
  font-size: 0.8rem;
  cursor: pointer;
}

.lang-toggle span {
  color: var(--text-light-muted);
  transition: var(--transition);
  padding: 2px 6px;
}

.lang-toggle span.active {
  color: var(--accent);
  background: rgba(0, 188, 212, 0.1);
  border-radius: 2px;
}

/* Mobile Menu Button */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-light);
  transition: var(--transition);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-family: 'Chakra Petch', 'Noto Sans SC', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-dark);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.btn-primary:hover {
  background: var(--accent-glow);
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.4);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-light);
  border: 2px solid var(--border-dark-strong);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0, 188, 212, 0.05);
}

.btn-dark {
  background: var(--bg-dark);
  color: var(--text-white);
}

.btn-dark:hover {
  background: var(--primary);
  transform: translateY(-2px);
}

/* ---- Hero Sections ---- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

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

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
}

.hero-tag {
  display: inline-block;
  font-family: 'Chakra Petch', 'Noto Sans SC', sans-serif;
  font-size: 0.85rem;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent);
  padding: 6px 16px;
  border: 1px solid var(--border-dark-strong);
  margin-bottom: 28px;
}

.hero h1 {
  font-size: 3.8rem;
  font-weight: 700;
  color: var(--text-white);
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: 1px;
}

.hero h1 .accent {
  color: var(--accent);
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-light-muted);
  max-width: 600px;
  margin-bottom: 40px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Page Hero (smaller) */
.page-hero {
  padding: 160px 0 80px;
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 188, 212, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 188, 212, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
}

.page-hero .container {
  position: relative;
  z-index: 2;
}

.page-hero h1 {
  font-size: 3rem;
  color: var(--text-white);
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 1.1rem;
  color: var(--text-light-muted);
  max-width: 600px;
}

/* Breadcrumb */
.breadcrumb {
  font-size: 0.85rem;
  color: var(--text-light-muted);
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { margin: 0 8px; }

/* ---- Stats Bar ---- */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 60px 0;
}

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

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 48px;
  background: var(--border-dark);
}

.stat-number {
  font-family: 'Chakra Petch', 'Noto Sans SC', sans-serif;
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-light-muted);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-top: 8px;
}

/* ---- Product Cards ---- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.product-card {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  position: relative;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--accent);
}

.product-card-image {
  height: 240px;
  background: var(--bg-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-card-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 188, 212, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 188, 212, 0.05) 1px, transparent 1px);
  background-size: 20px 20px;
}

.product-card-image svg {
  position: relative;
  z-index: 2;
}

.product-card-body {
  padding: 28px;
}

.product-card .product-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.product-card h3 {
  font-size: 1.4rem;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.product-card p {
  font-size: 0.9rem;
  color: var(--text-dark-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.product-card .product-link {
  font-family: 'Chakra Petch', 'Noto Sans SC', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.product-card .product-link:hover {
  color: var(--accent);
  gap: 12px;
}

/* ---- Feature/Advantage Cards ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 40px 28px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.02);
  transition: var(--transition);
  position: relative;
}

.feature-card:hover {
  border-color: var(--accent);
  background: rgba(0, 188, 212, 0.03);
  transform: translateY(-4px);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  border: 1px solid var(--border-dark-strong);
  position: relative;
}

.feature-icon::before {
  content: '';
  position: absolute;
  inset: 4px;
  border: 1px solid var(--border-dark);
}

.feature-card h3 {
  font-size: 1.2rem;
  color: var(--text-light);
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-light-muted);
  line-height: 1.7;
}

/* ---- Content Blocks ---- */
.content-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.content-block.reverse {
  direction: rtl;
}

.content-block.reverse > * {
  direction: ltr;
}

.content-text h2 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--text-dark);
}

.content-text p {
  color: var(--text-dark-muted);
  margin-bottom: 16px;
  line-height: 1.8;
}

.content-text .btn { margin-top: 16px; }

.content-visual {
  position: relative;
  min-height: 400px;
  background: var(--bg-dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.content-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 188, 212, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 188, 212, 0.05) 1px, transparent 1px);
  background-size: 30px 30px;
}

/* ---- Timeline ---- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}

.timeline-item {
  padding-left: 40px;
  padding-bottom: 48px;
  position: relative;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -7px;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--bg-dark);
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.timeline-year {
  font-family: 'Chakra Petch', 'Noto Sans SC', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.timeline-item h4 {
  font-size: 1.1rem;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.timeline-item p {
  font-size: 0.9rem;
  color: var(--text-dark-muted);
}

/* ---- Specs Table ---- */
.specs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.specs-table th,
.specs-table td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.specs-table th {
  background: var(--bg-light);
  font-weight: 600;
  color: var(--text-dark);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.specs-table td {
  color: var(--text-dark-muted);
}

.specs-table tr:hover td {
  background: rgba(0, 188, 212, 0.02);
}

.specs-note {
  margin-top: 16px;
  padding: 12px 20px;
  background: rgba(0, 188, 212, 0.06);
  border-left: 3px solid var(--accent-cyan);
  font-size: 0.85rem;
  color: var(--text-dark-muted);
  border-radius: 0 4px 4px 0;
}

/* ---- Product Detail Layout ---- */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  margin-bottom: 80px;
  align-items: start;
}

.product-detail-image {
  background: var(--bg-dark);
  border-radius: var(--radius-lg);
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.product-detail-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 188, 212, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 188, 212, 0.05) 1px, transparent 1px);
  background-size: 30px 30px;
  z-index: 1;
}

.product-detail-image img.product-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 2;
  border-radius: var(--radius-lg);
}

/* ---- Product Image Gallery ---- */
.product-gallery {
  width: 100%;
}

.product-gallery-main {
  background: var(--bg-dark);
  border-radius: var(--radius-lg);
  min-height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  margin-bottom: 12px;
}

.product-gallery-main::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 188, 212, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 188, 212, 0.05) 1px, transparent 1px);
  background-size: 30px 30px;
  z-index: 1;
}

.product-gallery-main img.product-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 2;
  border-radius: var(--radius-lg);
  transition: opacity 0.3s ease;
}

.product-gallery-thumbs {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.product-gallery-thumb {
  width: 96px;
  height: 72px;
  border-radius: var(--radius);
  border: 2px solid transparent;
  overflow: hidden;
  cursor: pointer;
  opacity: 0.7;
  transition: all 0.2s ease;
  background: var(--bg-dark);
}

.product-gallery-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-gallery-thumb:hover {
  opacity: 0.9;
  border-color: rgba(0, 188, 212, 0.4);
}

.product-gallery-thumb.active {
  opacity: 1;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 188, 212, 0.15);
}

.product-gallery-label {
  font-size: 0.7rem;
  color: var(--text-light-muted);
  text-align: center;
  margin-top: 4px;
}

.product-detail-info h3 {
  font-size: 1.8rem;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.product-detail-info .product-subtitle {
  font-size: 0.9rem;
  color: var(--accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.product-detail-info p {
  color: var(--text-dark-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}

.product-detail-info h4 {
  font-size: 1.1rem;
  color: var(--text-dark);
  margin: 32px 0 16px;
  padding-left: 16px;
  border-left: 3px solid var(--accent);
}

/* ---- Application Tags ---- */
.app-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.app-tag {
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--primary);
  background: rgba(21, 101, 192, 0.08);
  border: 1px solid rgba(21, 101, 192, 0.15);
  border-radius: 20px;
}

/* ---- Contact Form ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
}

.contact-info-item {
  display: flex;
  gap: 20px;
  margin-bottom: 32px;
}

.contact-info-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-light);
}

.contact-info-text h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-dark-muted);
  margin-bottom: 6px;
}

.contact-info-text p {
  font-size: 1rem;
  color: var(--text-dark);
  line-height: 1.6;
}

/* 联系电话：与「统一社会信用代码」框同用品牌字体，等宽感更强、数字更易读 */
.contact-info-text .tel-link {
  color: var(--primary);
  text-decoration: none;
  font-family: 'Chakra Petch', 'Noto Sans SC', sans-serif;
  letter-spacing: 0.5px;
  transition: color 0.2s ease;
}

.contact-info-text .tel-link:hover {
  color: var(--accent);
}

/* ---- Email List in Contact ---- */
.email-list {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 10px 14px;
  font-size: 0.95rem;
  line-height: 1.5;
}

/* display:contents 使 .email-label 与邮箱链接成为 .email-list 网格的直接子项，
   列宽自动取“最宽的标签”，中英文下邮箱均能严格左对齐。
   （原来每个 .email-item 各自 flex + min-width:90px，英文长标签会溢出导致错位） */
.email-item {
  display: contents;
}

.email-item .email-label {
  color: var(--text-dark-muted);
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
}

.email-item a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
  word-break: break-all;
}

.email-item a:hover {
  color: var(--accent);
}

.contact-form {
  background: var(--bg-light);
  padding: 48px;
  border-radius: var(--radius-lg);
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dark);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--bg-white);
  color: var(--text-dark);
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 188, 212, 0.1);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

/* ---- CTA Section ---- */
.cta-section {
  padding: 100px 0;
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 188, 212, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 188, 212, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
}

.cta-content {
  position: relative;
  z-index: 2;
  text-align: center;
}

.cta-content h2 {
  font-size: 2.8rem;
  color: var(--text-white);
  margin-bottom: 20px;
}

.cta-content p {
  font-size: 1.1rem;
  color: var(--text-light-muted);
  margin-bottom: 40px;
}

/* ---- Footer ---- */
.footer {
  background: var(--bg-darker);
  color: var(--text-light-muted);
  padding: 80px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .nav-logo {
  margin-bottom: 20px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 20px;
}

.footer-col h4 {
  font-size: 0.9rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 20px;
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--accent);
}

.footer-col ul li a.footer-tel {
  font-family: 'Chakra Petch', 'Noto Sans SC', sans-serif;
  letter-spacing: 0.5px;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--border-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

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

/* ---- Footer Record (备案信息) ---- */
.footer-record {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-record a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease;
}

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

/* 公安联网备案徽标 —— 公安部官方原图自托管（源图 62x67 含透明通道，按 20px 高等比显示） */
.beian-icon {
  display: block;
  height: 20px;
  width: auto;
  flex-shrink: 0;
}

.record-pending {
  font-size: 0.72rem;
  padding: 1px 6px;
  background: rgba(255, 193, 7, 0.15);
  color: #ffc107;
  border-radius: 3px;
  margin-left: 4px;
  font-style: italic;
}

@media (max-width: 600px) {
  .footer-record {
    flex-direction: column;
    gap: 10px;
  }
}

/* ---- Scroll Animations ---- */
.fade-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-up:nth-child(2) { transition-delay: 0.1s; }
.fade-up:nth-child(3) { transition-delay: 0.2s; }
.fade-up:nth-child(4) { transition-delay: 0.3s; }

/* ---- Decorative Elements ---- */
.corner-deco {
  position: absolute;
  width: 40px;
  height: 40px;
  border: 2px solid var(--accent);
  opacity: 0.5;
}

.corner-deco.tl { top: 20px; left: 20px; border-right: none; border-bottom: none; }
.corner-deco.tr { top: 20px; right: 20px; border-left: none; border-bottom: none; }
.corner-deco.bl { bottom: 20px; left: 20px; border-right: none; border-top: none; }
.corner-deco.br { bottom: 20px; right: 20px; border-left: none; border-top: none; }

/* ---- Responsive ---- */
@media (max-width: 968px) {
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-darker);
    flex-direction: column;
    padding: 32px;
    gap: 24px;
    transform: translateY(-150%);
    transition: transform 0.4s ease;
    border-bottom: 1px solid var(--border-dark);
  }

  .nav-menu.open { transform: translateY(0); }
  .nav-toggle { display: flex; }
  .nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(7px, -7px); }

  .hero h1 { font-size: 2.4rem; }
  .section { padding: 64px 0; }
  .section-title { font-size: 1.8rem; }

  .product-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .stats-bar { grid-template-columns: 1fr 1fr; gap: 32px; }
  .stat-item:nth-child(2)::after { display: none; }
  .content-block { grid-template-columns: 1fr; gap: 40px; }
  .content-block.reverse { direction: ltr; }
  .product-detail { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
}

@media (max-width: 600px) {
  .feature-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: 1fr; }
  .stat-item::after { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
  .cta-content h2 { font-size: 2rem; }
  .contact-form { padding: 32px 24px; }
  .nav-logo .logo-svg { height: 28px; }
}

/* ===== 产品分类锚点导航 (2026-08-29) ===== */
.cat-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}
.cat-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid rgba(0, 188, 212, 0.35);
  border-radius: 8px;
  background: rgba(10, 31, 61, 0.03);
  color: var(--text-dark, #16283C);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: all 0.25s ease;
}
.cat-nav-link:hover {
  border-color: #00B4D8;
  background: rgba(0, 188, 212, 0.08);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 188, 212, 0.15);
}
.cat-nav-num {
  font-family: 'Chakra Petch', 'Noto Sans SC', sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: #00B4D8;
  letter-spacing: 1px;
}
.cat-desc {
  max-width: 680px;
  margin: 14px auto 0;
  font-size: 14.5px;
  color: #5A7085;
  line-height: 1.7;
}
@media (max-width: 768px) {
  .cat-nav { gap: 8px; }
  .cat-nav-link { padding: 9px 14px; font-size: 13px; }
}