/* ===== 科技风设计系统 ===== */
:root {
  --primary: #dc2626;
  --primary-glow: rgba(220, 38, 38, 0.45);
  --primary-dim: rgba(220, 38, 38, 0.15);
  --primary-border: rgba(220, 38, 38, 0.35);
  --primary-dark: #991b1b;
  --accent: #f87171;
  --bg-base: #070b12;
  --bg-surface: #0d1320;
  --bg-card: rgba(13, 19, 32, 0.85);
  --bg-card-hover: rgba(20, 28, 46, 0.95);
  --text-primary: #e8eaed;
  --text-secondary: #8b95a8;
  --text-muted: #5c6678;
  --border: rgba(220, 38, 38, 0.12);
  --border-light: rgba(255, 255, 255, 0.06);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(220, 38, 38, 0.15);
  --radius: 4px;
  --radius-sm: 2px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-height: 68px;
  --font-mono: "Consolas", "SF Mono", "Courier New", monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-base);
  line-height: 1.6;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(220, 38, 38, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(220, 38, 38, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ===== SVG 图标 ===== */
.icon,
[data-icon] svg,
.feature-icon svg,
.info-icon svg,
.product-image svg,
.product-detail-image svg,
.about-image svg {
  width: 100%;
  height: 100%;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.product-image img,
.product-detail-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  position: relative;
  z-index: 1;
  padding: 0;
  background: transparent;
}

.icon {
  width: 36px;
  height: 36px;
  color: var(--primary);
  margin: 0 auto 12px;
}

.feature-icon,
.info-icon {
  color: var(--primary);
}

.feature-icon {
  width: 32px;
  height: 32px;
  margin: 0 auto 20px;
}

.info-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.product-image svg,
.product-detail-image svg,
.about-image svg {
  width: 64px;
  height: 64px;
  color: var(--primary);
  opacity: 0.85;
}

.product-detail-image svg {
  width: 80px;
  height: 80px;
}

.about-image svg {
  width: 72px;
  height: 72px;
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(7, 11, 18, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(7, 11, 18, 0.96);
  box-shadow: 0 1px 0 var(--border), var(--shadow-glow);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-img {
  height: 40px;
  width: auto;
  flex-shrink: 0;
  display: block;
}

.logo-mark {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  display: block;
  image-rendering: auto;
  filter: drop-shadow(0 0 8px var(--primary-glow));
}

.logo-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
  letter-spacing: 0.5px;
}

.logo-text span {
  display: block;
  font-size: 10px;
  font-weight: 400;
  font-family: var(--font-mono);
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-top: 2px;
}

.nav-links {
  display: flex;
  gap: 4px;
}

.nav-links a {
  padding: 8px 16px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
  letter-spacing: 0.3px;
}

.nav-links a::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 16px;
  right: 16px;
  height: 1px;
  background: var(--primary);
  transform: scaleX(0);
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a:hover::before,
.nav-links a.active::before {
  transform: scaleX(1);
}

.nav-links a.active {
  color: var(--primary);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -5px);
}

/* ===== 页面 Banner ===== */
.page-banner {
  margin-top: var(--nav-height);
  padding: 72px 0;
  background: linear-gradient(180deg, rgba(220, 38, 38, 0.08) 0%, transparent 100%);
  border-bottom: 1px solid var(--border);
  text-align: center;
  position: relative;
}

.page-banner::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
}

.page-banner h1 {
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.page-banner p {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

.breadcrumb {
  margin-top: 20px;
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 1px;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  color: var(--text-muted);
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin: 0 10px;
  color: var(--text-muted);
  opacity: 0.6;
}

.breadcrumb li[aria-current="page"] {
  color: var(--text-secondary);
}

.breadcrumb a {
  color: var(--primary);
  transition: var(--transition);
}

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

/* 产品卡片链接 */
.product-card-link {
  display: block;
  color: inherit;
  height: 100%;
}

.product-card-link:hover .card-more {
  color: var(--primary);
}

.card-more {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  letter-spacing: 0.5px;
  transition: var(--transition);
}

.detail-nav {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-light);
}

.detail-nav h3 {
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 24px;
  letter-spacing: 1px;
}

/* ===== 新闻动态 ===== */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 28px 32px;
  transition: var(--transition);
  display: block;
  color: inherit;
}

.news-card:hover {
  border-color: var(--primary-border);
  box-shadow: var(--shadow-glow);
}

.news-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.news-category {
  padding: 3px 10px;
  border: 1px solid var(--primary-border);
  color: var(--primary);
  letter-spacing: 0.5px;
}

.news-card h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.news-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.news-read-more {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--primary);
  letter-spacing: 0.5px;
}

.article-wrap {
  max-width: 800px;
  margin: 0 auto;
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.article-header h1 {
  font-size: 1.8rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.article-content {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.9;
}

.article-content p {
  margin-bottom: 20px;
}

.article-back {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}

.home-news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.home-news-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 24px;
  transition: var(--transition);
  display: block;
  color: inherit;
}

.home-news-item:hover {
  border-color: var(--primary-border);
}

.home-news-item time {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.home-news-item h3 {
  font-size: 1rem;
  color: var(--text-primary);
  margin: 10px 0 8px;
  line-height: 1.5;
}

.home-news-item p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

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

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-bg > img {
  position: absolute;
  top: 0;
  right: 0;
  width: 62%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}

.hero-bg__fade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, var(--bg-base) 0%, rgba(7, 11, 18, 0.92) 38%, rgba(7, 11, 18, 0.45) 58%, rgba(7, 11, 18, 0.2) 100%),
    linear-gradient(0deg, var(--bg-base) 0%, transparent 28%);
}

.hero::before {
  content: "";
  position: absolute;
  top: 20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(220, 38, 38, 0.12) 0%, transparent 65%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary);
  border: 1px solid var(--primary-border);
  padding: 6px 14px;
  margin-bottom: 24px;
  background: var(--primary-dim);
}

.hero-content h1 {
  font-size: 2.6rem;
  line-height: 1.25;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.hero-content h1 em {
  font-style: normal;
  color: var(--primary);
  text-shadow: 0 0 40px var(--primary-glow);
}

.hero-content p {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.85;
  max-width: 520px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.5px;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  position: relative;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
}

.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  pointer-events: none;
}

.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 0 24px var(--primary-glow);
}

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

.btn-outline:hover {
  border-color: var(--primary-border);
  color: var(--primary);
  box-shadow: inset 0 0 20px var(--primary-dim);
}

.hero-visual {
  position: relative;
  z-index: 1;
}

.hero-side-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.hero-services {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: rgba(13, 19, 32, 0.88);
  border: 1px solid var(--border-light);
  padding: 8px;
  backdrop-filter: blur(8px);
}

.hero-service {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid transparent;
  color: inherit;
  transition: var(--transition);
}

.hero-service:hover {
  border-color: var(--border);
  background: rgba(220, 38, 38, 0.06);
}

.hero-service-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-dim);
  border: 1px solid var(--primary-border);
}

.hero-service-icon svg {
  width: 22px;
  height: 22px;
  color: var(--primary);
}

.hero-service-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: left;
}

.hero-service-body strong {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.hero-service-body small {
  font-size: 12px;
  color: var(--text-muted);
}

.hero-service-arrow {
  flex-shrink: 0;
  font-size: 18px;
  color: var(--text-muted);
  transition: var(--transition);
}

.hero-service:hover .hero-service-arrow {
  color: var(--primary);
  transform: translateX(3px);
}

.hero-card {
  background: rgba(13, 19, 32, 0.82);
  border: 1px solid var(--border);
  padding: 32px;
  position: relative;
  backdrop-filter: blur(8px);
}

.hero-card::before,
.hero-card::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border-color: var(--primary);
  border-style: solid;
}

.hero-card::before {
  top: -1px;
  left: -1px;
  border-width: 2px 0 0 2px;
}

.hero-card::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 2px 2px 0;
}

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

.hero-grid-duo {
  grid-template-columns: 1fr 1fr;
}

.hero-item {
  background: rgba(220, 38, 38, 0.06);
  border: 1px solid var(--border);
  padding: 24px 16px;
  text-align: center;
  transition: var(--transition);
  display: block;
  color: inherit;
}

.hero-item-image {
  padding: 0;
  overflow: hidden;
}

.hero-item-image img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  background: var(--bg-surface);
  display: block;
  border-bottom: 1px solid var(--border-light);
}

.hero-item-image h3 {
  padding: 16px 12px;
  margin: 0;
}

.hero-item:hover {
  border-color: var(--primary-border);
  background: rgba(220, 38, 38, 0.12);
  box-shadow: var(--shadow-glow);
}

.hero-item-image:hover img {
  transform: scale(1.03);
  transition: var(--transition);
}

.hero-item h3 {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 1px;
}

/* ===== 通用区块 ===== */
.section {
  padding: 80px 0;
  position: relative;
}

.section-alt {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.section-header p {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  font-size: 14px;
}

.section-header .divider {
  width: 40px;
  height: 2px;
  background: var(--primary);
  margin: 20px auto 0;
  box-shadow: 0 0 12px var(--primary-glow);
}

/* ===== 产品卡片 ===== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

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

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

.product-image {
  aspect-ratio: 1 / 1;
  height: auto;
  background: linear-gradient(145deg, #141c2e 0%, #0d1320 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.product-image::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(220, 38, 38, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(220, 38, 38, 0.04) 1px, transparent 1px);
  background-size: 20px 20px;
}

.product-body {
  padding: 24px;
}

.product-body h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.product-body p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  padding: 3px 10px;
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary-border);
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}

/* ===== 特色卡片 ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  padding: 32px 24px;
  border: 1px solid var(--border-light);
  text-align: center;
  transition: var(--transition);
  position: relative;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 24px;
  right: 24px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-dim), transparent);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--primary-border);
  box-shadow: var(--shadow-glow);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--primary-border);
  background: var(--primary-dim);
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== 统计数据 ===== */
.stats-section {
  background: var(--bg-surface);
  padding: 60px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  position: relative;
}

.stats-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(220, 38, 38, 0.04), transparent);
  pointer-events: none;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.4rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--primary);
  margin-bottom: 6px;
  text-shadow: 0 0 30px var(--primary-glow);
}

.stat-item p {
  color: var(--text-secondary);
  font-size: 13px;
  letter-spacing: 1px;
}

/* ===== 关于 ===== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.about-text h2 {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.85;
  font-size: 14px;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  position: relative;
  z-index: 1;
}

.about-image {
  background: linear-gradient(145deg, #141c2e 0%, #0d1320 100%);
  border: 1px solid var(--border);
  aspect-ratio: 3 / 2;
  height: auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.about-image::before,
.about-image::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border-color: var(--primary);
  border-style: solid;
  opacity: 0.6;
}

.about-image::before {
  top: 12px;
  left: 12px;
  border-width: 2px 0 0 2px;
}

.about-image::after {
  bottom: 12px;
  right: 12px;
  border-width: 0 2px 2px 0;
}

.timeline {
  position: relative;
  padding-left: 30px;
  margin-top: 32px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--primary), var(--border));
}

.timeline-item {
  position: relative;
  margin-bottom: 28px;
  padding-left: 24px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary-glow);
}

.timeline-item h4 {
  color: var(--primary);
  font-size: 13px;
  font-family: var(--font-mono);
  margin-bottom: 4px;
  letter-spacing: 1px;
}

.timeline-item p {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.75;
}

.timeline-item ul {
  margin: 8px 0 12px;
  padding-left: 18px;
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.75;
}

.timeline-item li {
  margin-bottom: 6px;
}

/* ===== 服务 ===== */
.services-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--bg-card);
  padding: 32px 28px;
  border: 1px solid var(--border-light);
  transition: var(--transition);
  position: relative;
}

.service-card:hover {
  border-color: var(--primary-border);
  box-shadow: var(--shadow-glow);
}

.service-number {
  font-size: 2.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: rgba(220, 38, 38, 0.2);
  line-height: 1;
  margin-bottom: 16px;
}

.service-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.service-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== 联系 ===== */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.info-card {
  background: var(--bg-card);
  padding: 20px;
  border: 1px solid var(--border-light);
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: var(--transition);
}

.info-card:hover {
  border-color: var(--primary-border);
}

.info-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--primary-border);
  background: var(--primary-dim);
  flex-shrink: 0;
}

.info-card h4 {
  color: var(--text-primary);
  margin-bottom: 4px;
  font-size: 14px;
  font-weight: 600;
}

.info-card p {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.6;
}

.contact-form {
  background: var(--bg-card);
  padding: 36px;
  border: 1px solid var(--border);
  position: relative;
}

.contact-form::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 24px;
  width: 60px;
  height: 2px;
  background: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
}

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

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border-light);
  font-size: 14px;
  font-family: inherit;
  transition: var(--transition);
  background: var(--bg-base);
  color: var(--text-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-border);
  box-shadow: 0 0 0 2px var(--primary-dim);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group select option {
  background: var(--bg-surface);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ===== 产品详情 ===== */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: start;
  margin-bottom: 60px;
}

.product-detail-image {
  background: linear-gradient(145deg, #141c2e 0%, #0d1320 100%);
  border: 1px solid var(--border);
  aspect-ratio: 1 / 1;
  height: auto;
  width: 100%;
  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(220, 38, 38, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(220, 38, 38, 0.05) 1px, transparent 1px);
  background-size: 30px 30px;
}

.product-detail-info h2 {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.product-detail-info .desc {
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 24px;
  font-size: 14px;
}

.spec-list {
  margin-bottom: 28px;
}

.spec-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  font-size: 13px;
}

.spec-list li span:first-child {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.5px;
}

.spec-list li span:last-child {
  color: var(--text-primary);
}

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, rgba(220, 38, 38, 0.1), rgba(7, 11, 18, 0.8));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
  padding: 60px 0;
}

.cta-section h2 {
  color: var(--text-primary);
  margin-bottom: 12px;
  font-size: 1.6rem;
  letter-spacing: 1px;
}

.cta-section p {
  color: var(--text-secondary);
  margin-bottom: 28px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  font-size: 14px;
}

/* ===== 页脚 ===== */
.footer {
  background: #04070d;
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border-light);
}

.footer-brand p {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-muted);
}

.footer h4 {
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a,
.footer-links li {
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}

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

/* ===== 动画（渐进增强：无 JS 时内容默认可见，供爬虫读取） ===== */
.fade-in {
  opacity: 1;
  transform: none;
}

.js .fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  .js .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  .hero .container,
  .about-content,
  .contact-wrapper,
  .product-detail {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

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

  .hero-visual {
    order: -1;
  }

  .hero-bg > img {
    width: 100%;
    height: 55%;
    top: auto;
    bottom: 0;
    object-position: center bottom;
  }

  .hero-bg__fade {
    background:
      linear-gradient(0deg, var(--bg-base) 0%, rgba(7, 11, 18, 0.75) 45%, rgba(7, 11, 18, 0.95) 100%);
  }
}

@media (max-width: 768px) {
  .logo-img {
    height: 34px;
  }

  .menu-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(7, 11, 18, 0.98);
    flex-direction: column;
    padding: 16px;
    gap: 2px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-links a {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-light);
  }

  .hero-content h1 {
    font-size: 1.9rem;
  }

  .page-banner h1 {
    font-size: 1.6rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  margin-bottom: 12px;
  padding: 0 20px;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  padding: 16px 0;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  padding-bottom: 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 32px;
  font-size: 14px;
}

.pricing-table caption {
  caption-side: top;
  text-align: left;
  padding-bottom: 12px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.pricing-table th,
.pricing-table td {
  border: 1px solid var(--border-light);
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  line-height: 1.65;
}

.pricing-table thead th {
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 600;
}

.pricing-table tbody th {
  color: var(--text-primary);
  font-weight: 600;
  white-space: nowrap;
}

.pricing-table tbody td:last-child {
  color: var(--primary);
  font-weight: 600;
  white-space: nowrap;
}

.pricing-table .pricing-group-row th {
  background: var(--bg-alt, #f0f4f8);
  color: var(--primary, #1a5fb4);
  font-weight: 600;
  text-align: left;
  padding-top: 1rem;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: var(--transition);
}

.pricing-card:hover {
  border-color: var(--primary-border);
}

.pricing-card-head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.pricing-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  border: 1px solid var(--primary-border);
  background: var(--primary-dim);
}

.pricing-card-head h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.pricing-card-head p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

.pricing-card-price {
  padding-top: 4px;
  border-top: 1px solid var(--border-light);
}

.pricing-label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.pricing-card-price strong {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
}

.pricing-card-price em {
  font-style: normal;
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
  margin-right: 4px;
}

.pricing-extra {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.6;
  padding: 10px 12px;
  background: rgba(220, 38, 38, 0.06);
  border-left: 2px solid var(--primary);
}

.pricing-footnote {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.75;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}