:root {
  --primary: #1a5f9e;
  --primary-light: #2a7fd4;
  --primary-dark: #0d3b66;
  --primary-deeper: #0a1628;
  --accent: #4da3ff;
  --accent-glow: rgba(77, 163, 255, 0.4);
  --bg: #f5f8fc;
  --bg-alt: #eef3f9;
  --surface: #ffffff;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --surface-glass-border: rgba(255, 255, 255, 0.5);
  --text: #1a2332;
  --text-secondary: #4a5a6e;
  --text-muted: #7a8a9e;
  --border: #dce5ef;
  --shadow-sm: 0 2px 8px rgba(26, 95, 158, 0.08);
  --shadow-md: 0 8px 24px rgba(26, 95, 158, 0.12);
  --shadow-lg: 0 16px 48px rgba(26, 95, 158, 0.18);
  --shadow-glow: 0 0 40px rgba(42, 127, 212, 0.25);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-fast: 0.2s ease;
  --font: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --max-width: 1200px;
  --header-height: 68px;
}

/* ===== 暗色模式 ===== */
[data-theme="dark"] {
  --bg: #0b1420;
  --bg-alt: #0f1a2a;
  --surface: #14223a;
  --surface-glass: rgba(20, 34, 58, 0.78);
  --surface-glass-border: rgba(77, 163, 255, 0.15);
  --text: #e8eef6;
  --text-secondary: #a8b8cc;
  --text-muted: #6a7e96;
  --border: #1e3050;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(42, 127, 212, 0.15);
}

/* ===== 基础重置 ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input,
textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
  color: inherit;
}

address {
  font-style: normal;
}

/* ===== 无障碍 ===== */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

a[href="#main-content"]:focus {
  position: fixed !important;
  left: 16px !important;
  top: 16px !important;
  z-index: 9999;
  background: var(--primary);
  color: #fff;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

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

/* ===== 顶部导航 ===== */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--surface-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--surface-glass-border);
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}

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

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.logo-area {
  flex-shrink: 0;
}

.logo-area a {
  display: flex;
  align-items: center;
}

.logo-area svg {
  transition: transform var(--transition);
}

.logo-area a:hover svg {
  transform: scale(1.04);
}

/* 主导航 */
.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 20px;
  height: 2px;
  background: var(--primary-light);
  border-radius: 2px;
  transition: transform var(--transition);
}

.main-nav a:hover {
  color: var(--primary-light);
  background: rgba(26, 95, 158, 0.06);
}

.main-nav a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

/* 头部操作按钮 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.header-actions button {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.header-actions button:hover {
  background: rgba(26, 95, 158, 0.1);
  transform: scale(1.08);
}

.header-actions button:active {
  transform: scale(0.95);
}

.header-actions svg {
  transition: stroke var(--transition);
}

[data-theme="dark"] .header-actions svg {
  stroke: var(--text-secondary);
}

.mobile-menu-btn {
  display: none;
}

/* 搜索栏 */
.search-bar {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94), padding 0.4s;
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid transparent;
}

.search-bar.open {
  max-height: 80px;
  border-top-color: var(--border);
}

.search-bar form {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  gap: 10px;
  align-items: center;
}

.search-bar input {
  flex: 1;
  padding: 10px 18px;
  border-radius: 100px;
  background: var(--bg-alt);
  border: 1.5px solid var(--border);
  color: var(--text);
  font-size: 15px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-bar input::placeholder {
  color: var(--text-muted);
}

.search-bar input:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-bar button {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.search-bar button:hover {
  transform: scale(1.06);
  box-shadow: 0 4px 16px var(--accent-glow);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  margin-top: var(--header-height);
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.breadcrumb ol {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: '/';
  color: var(--border);
  font-weight: 300;
}

.breadcrumb a {
  color: var(--text-secondary);
  font-weight: 500;
}

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

/* ===== 首屏 Banner ===== */
.hero {
  position: relative;
  min-height: 560px;
  overflow: hidden;
  background: var(--primary-deeper);
}

.hero-slides {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 560px;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease, visibility 0.8s ease;
  display: flex;
  align-items: center;
}

.hero-slide.active {
  opacity: 1;
  visibility: visible;
  position: relative;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero-slide::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 22, 40, 0.85) 0%, rgba(13, 59, 102, 0.6) 50%, rgba(26, 95, 158, 0.4) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px;
  width: 100%;
}

.hero-content h1,
.hero-content h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.3;
  color: #ffffff;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  max-width: 720px;
}

.hero-content p {
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
  max-width: 640px;
  margin-bottom: 32px;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  border-radius: 100px;
  box-shadow: 0 8px 28px rgba(42, 127, 212, 0.45);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
  position: relative;
  overflow: hidden;
}

.hero-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.hero-btn:hover {
  color: #ffffff;
  transform: translateY(-3px);
  box-shadow: 0 14px 40px rgba(42, 127, 212, 0.6);
}

.hero-btn:hover::before {
  opacity: 1;
}

.hero-btn:active {
  transform: translateY(-1px);
}

/* 轮播指示器 */
.hero-dots {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: 10px;
}

.hero-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  transition: all var(--transition);
  position: relative;
}

.hero-dots .dot.active {
  width: 32px;
  border-radius: 6px;
  background: #ffffff;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.5);
}

.hero-dots .dot:hover {
  background: rgba(255, 255, 255, 0.7);
}

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

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

.section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  position: relative;
  padding-bottom: 18px;
}

.section h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 56px;
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}

.section h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}

.section h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.section-intro {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin-bottom: 40px;
  line-height: 1.8;
}

/* ===== 品牌介绍 ===== */
.brand-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 48px;
  align-items: start;
  margin-top: 32px;
}

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

.brand-text strong {
  color: var(--primary-light);
  font-weight: 600;
}

.brand-visual {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.brand-visual svg {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.brand-visual svg:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-lg);
}

/* 数据统计 */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.stat-item {
  text-align: center;
  padding: 28px 16px;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.stat-number {
  display: block;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--primary-light);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat-unit {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ===== 产品卡片 ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(42, 127, 212, 0.3);
}

.product-card:hover::before {
  transform: scaleX(1);
}

.product-icon {
  margin-bottom: 20px;
  transition: transform var(--transition);
}

.product-card:hover .product-icon {
  transform: scale(1.1) rotate(-3deg);
}

.product-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--text);
}

.product-card > p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

.product-card ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.product-card li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
}

.product-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  opacity: 0.7;
}

/* ===== 解决方案 ===== */
.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.solution-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.solution-card::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.solution-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.solution-card:hover::after {
  opacity: 1;
}

.solution-card h3 {
  font-size: 1.2rem;
  margin-bottom: 14px;
  color: var(--primary-light);
}

.solution-card > p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

.solution-card h4 {
  font-size: 0.95rem;
  margin-bottom: 12px;
  color: var(--text);
}

.solution-card ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.solution-card li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding-left: 22px;
  position: relative;
  line-height: 1.6;
}

.solution-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary-light);
}

/* ===== 行业应用 ===== */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.industry-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  position: relative;
}

.industry-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--surface), rgba(42, 127, 212, 0.06));
}

.industry-item h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--text);
}

.industry-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ===== 客户案例 ===== */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

.case-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.case-card h3 {
  font-size: 1.1rem;
  margin-bottom: 14px;
  color: var(--text);
  line-height: 1.5;
}

.case-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 12px;
  flex: 1;
}

.case-meta {
  font-size: 0.82rem !important;
  color: var(--text-muted) !important;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
  margin-top: auto;
}

/* ===== 客户评价 ===== */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.testimonial {
  background: var(--surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--surface-glass-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}

.testimonial::before {
  content: '"';
  position: absolute;
  top: 12px;
  left: 24px;
  font-size: 4rem;
  line-height: 1;
  color: var(--primary-light);
  opacity: 0.12;
  font-family: Georgia, serif;
}

.testimonial:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.testimonial p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.testimonial footer {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary-light);
}

/* ===== 新闻中心 ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.news-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.news-card time {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  font-weight: 500;
}

.news-card h3 {
  font-size: 1.08rem;
  margin-bottom: 12px;
  line-height: 1.5;
}

.news-card h3 a {
  color: var(--text);
  transition: color var(--transition-fast);
}

.news-card h3 a:hover {
  color: var(--primary-light);
}

.news-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
  flex: 1;
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary-light);
  transition: gap var(--transition), color var(--transition-fast);
  align-self: flex-start;
}

.read-more::after {
  content: '→';
  transition: transform var(--transition);
}

.read-more:hover {
  color: var(--accent);
  gap: 10px;
}

.read-more:hover::after {
  transform: translateX(3px);
}

/* ===== 技术文章列表 ===== */
.article-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.article-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
}

.article-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(42, 127, 212, 0.3);
}

.article-item h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  line-height: 1.5;
  color: var(--text);
}

.article-item time {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  font-weight: 500;
}

.article-summary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
  flex: 1;
}

/* ===== HowTo 教程 ===== */
.howto-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-sm);
}

.howto-content h3 {
  font-size: 1.15rem;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--primary-light);
  padding-left: 16px;
  border-left: 4px solid var(--primary-light);
}

.howto-content h3:first-child {
  margin-top: 0;
}

.howto-content p {
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 12px;
}

.howto-content ul,
.howto-content ol {
  margin-bottom: 16px;
  padding-left: 8px;
}

.howto-content ul li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 8px;
  color: var(--text-secondary);
  line-height: 1.75;
  font-size: 0.95rem;
}

.howto-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  opacity: 0.7;
}

.howto-content ol {
  counter-reset: step;
  list-style: none;
}

.howto-content ol li {
  position: relative;
  padding-left: 44px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.95rem;
  counter-increment: step;
}

.howto-content ol li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.howto-content strong {
  color: var(--text);
  font-weight: 600;
}

/* ===== FAQ ===== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.faq-item:hover {
  border-color: rgba(42, 127, 212, 0.3);
  box-shadow: var(--shadow-sm);
}

.faq-item[open] {
  box-shadow: var(--shadow-md);
  border-color: rgba(42, 127, 212, 0.35);
}

.faq-item summary {
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

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

.faq-item summary::after {
  content: '+';
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-alt);
  color: var(--primary-light);
  font-size: 1.2rem;
  font-weight: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition), background var(--transition);
}

.faq-item[open] summary::after {
  content: '−';
  transform: rotate(180deg);
  background: var(--primary-light);
  color: #fff;
}

.faq-item summary:hover {
  color: var(--primary-light);
  background: rgba(26, 95, 158, 0.04);
}

.faq-answer {
  padding: 0 24px 22px;
  animation: fadeSlideIn 0.35s ease;
}

.faq-answer p {
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.85;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.contact-info h3 {
  font-size: 1.3rem;
  margin-bottom: 20px;
  color: var(--primary-light);
}

.contact-info address p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
  line-height: 1.7;
}

.contact-info address strong {
  color: var(--text);
  font-weight: 600;
}

.contact-info address a {
  color: var(--primary-light);
  font-weight: 500;
}

.contact-info address a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.contact-info h4 {
  margin-top: 24px;
  margin-bottom: 10px;
  font-size: 1rem;
  color: var(--text);
}

.contact-info > p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.contact-info ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.contact-info ul li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding-left: 22px;
  position: relative;
  line-height: 1.6;
}

.contact-info ul li::before {
  content: '✓';
  position: absolute;
  left: 0;
  font-weight: 700;
  color: var(--primary-light);
  font-size: 0.85rem;
}

.contact-map svg {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition), box-shadow var(--transition);
}

.contact-map svg:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* ===== 网站地图 ===== */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.sitemap-grid h3 {
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--primary-light);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border);
}

.sitemap-grid ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sitemap-grid li a {
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}

.sitemap-grid li a:hover {
  color: var(--primary-light);
  padding-left: 6px;
}

/* ===== 法律信息 ===== */
.legal-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-sm);
}

.legal-content h3 {
  font-size: 1.1rem;
  margin-top: 28px;
  margin-bottom: 10px;
  color: var(--primary-light);
  padding-left: 16px;
  border-left: 4px solid var(--primary-light);
}

.legal-content h3:first-child {
  margin-top: 0;
}

.legal-content p {
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 12px;
}

.update-info {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px dashed var(--border);
  font-size: 0.85rem !important;
  color: var(--text-muted) !important;
}

/* ===== 页脚 ===== */
#site-footer {
  background: linear-gradient(180deg, var(--primary-deeper), #060e18);
  color: rgba(255, 255, 255, 0.75);
  padding: 60px 0 0;
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(42, 127, 212, 0.12), transparent 70%);
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  z-index: 1;
}

.footer-brand svg {
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 8px;
}

.footer-links h3,
.footer-contact h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 10px;
}

.footer-links h3::after,
.footer-contact h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-light), var(--accent));
  border-radius: 2px;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}

.footer-links a:hover {
  color: var(--accent);
  padding-left: 6px;
}

.footer-contact address p {
  font-size: 0.88rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.4);
  line-height: 1.8;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.55);
  transition: color var(--transition-fast);
}

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

/* ===== 返回顶部 ===== */
#back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 24px rgba(26, 95, 158, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 10px 36px rgba(42, 127, 212, 0.55);
}

#back-to-top:active {
  transform: translateY(-2px) scale(0.98);
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ===== 响应式 - 平板 ===== */
@media (max-width: 1024px) {
  .main-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--surface-glass);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--surface-glass-border);
    padding: 16px 24px;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: menuSlideDown 0.3s ease;
  }

  .main-nav.open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 4px;
  }

  .main-nav a {
    padding: 12px 16px;
    font-size: 16px;
    border-radius: var(--radius-sm);
  }

  .main-nav a::after {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  @keyframes menuSlideDown {
    from {
      opacity: 0;
      transform: translateY(-12px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

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

  .brand-visual {
    position: static;
    max-width: 480px;
  }

  .product-grid,
  .solution-grid,
  .case-grid,
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* ===== 响应式 - 手机 ===== */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .header-inner {
    padding: 0 16px;
  }

  .section {
    padding: 56px 0;
  }

  .section h2 {
    font-size: 1.4rem;
  }

  .section-intro {
    font-size: 0.95rem;
    margin-bottom: 28px;
  }

  .hero {
    min-height: 480px;
  }

  .hero-slides {
    min-height: 480px;
  }

  .hero-content {
    padding: 60px 16px;
  }

  .hero-content h1,
  .hero-content h2 {
    font-size: 1.5rem;
  }

  .hero-content p {
    font-size: 0.92rem;
  }

  .hero-btn {
    padding: 12px 28px;
    font-size: 15px;
  }

  .hero-dots {
    bottom: 20px;
  }

  .product-grid,
  .solution-grid,
  .case-grid,
  .news-grid,
  .industry-grid,
  .testimonial-grid,
  .article-list {
    grid-template-columns: 1fr;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .stat-item {
    padding: 20px 12px;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .sitemap-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .howto-content,
  .legal-content {
    padding: 28px 20px;
  }

  .howto-content h3,
  .legal-content h3 {
    font-size: 1.05rem;
  }

  .faq-item summary {
    padding: 16px 18px;
    font-size: 0.95rem;
  }

  .faq-answer {
    padding: 0 18px 18px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    padding: 20px 0;
  }

  .footer-bottom p {
    font-size: 0.78rem;
  }

  #back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }

  .product-card,
  .solution-card,
  .case-card,
  .news-card {
    padding: 24px 20px;
  }

  .testimonial {
    padding: 24px 20px;
  }

  .article-item {
    padding: 22px 18px;
  }
}

/* ===== 响应式 - 小手机 ===== */
@media (max-width: 400px) {
  .hero-content h1,
  .hero-content h2 {
    font-size: 1.3rem;
  }

  .hero {
    min-height: 440px;
  }

  .hero-slides {
    min-height: 440px;
  }

  .stats-row {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .stat-item {
    padding: 16px 8px;
  }

  .stat-number {
    font-size: 1.3rem;
  }

  .stat-label {
    font-size: 0.78rem;
  }

  .breadcrumb ol {
    padding: 10px 16px;
    font-size: 12px;
  }
}

/* ===== 打印样式 ===== */
@media print {
  #site-header,
  #back-to-top,
  .hero,
  .search-bar,
  .mobile-menu-btn,
  .dark-toggle,
  .search-toggle {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .section {
    padding: 20px 0;
    page-break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  .faq-item {
    border: 1px solid #ccc;
  }

  .faq-item[open] summary::after {
    display: none;
  }
}

/* ===== 减少动画偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ===== 高对比度模式 ===== */
@media (prefers-contrast: high) {
  :root {
    --border: #000;
    --text-secondary: #000;
    --text-muted: #333;
  }

  .product-card,
  .solution-card,
  .case-card,
  .news-card,
  .faq-item {
    border-width: 2px;
  }
}

/* ===== 暗色模式细节 ===== */
[data-theme="dark"] .hero-slide::after {
  background: linear-gradient(135deg, rgba(5, 12, 22, 0.9) 0%, rgba(10, 30, 55, 0.75) 50%, rgba(15, 45, 80, 0.5) 100%);
}

[data-theme="dark"] .product-card,
[data-theme="dark"] .solution-card,
[data-theme="dark"] .case-card,
[data-theme="dark"] .news-card,
[data-theme="dark"] .article-item,
[data-theme="dark"] .industry-item {
  background: var(--surface);
}

[data-theme="dark"] .testimonial {
  background: var(--surface-glass);
}

[data-theme="dark"] .howto-content,
[data-theme="dark"] .legal-content {
  background: var(--surface);
}

[data-theme="dark"] .faq-item summary::after {
  background: var(--bg-alt);
}

[data-theme="dark"] .faq-item[open] summary::after {
  background: var(--primary-light);
}

[data-theme="dark"] .search-bar input {
  background: var(--bg);
}

[data-theme="dark"] #site-footer {
  background: linear-gradient(180deg, #060e18, #030810);
}

[data-theme="dark"] .breadcrumb {
  background: var(--bg-alt);
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-alt);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--primary-light));
  border-radius: 5px;
  border: 2px solid var(--bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-light);
}

/* Firefox 滚动条 */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--primary) var(--bg-alt);
}

/* ===== 选中文字 ===== */
::selection {
  background: var(--primary-light);
  color: #ffffff;
}

::-moz-selection {
  background: var(--primary-light);
  color: #ffffff;
}

/* ===== 焦点可见 ===== */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

button:focus-visible,
a:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

/* ===== 毛玻璃增强 ===== */
@supports not (backdrop-filter: blur(1px)) {
  #site-header {
    background: var(--surface);
  }

  .search-bar {
    background: var(--surface);
  }

  .testimonial {
    background: var(--surface);
  }
}

/* ===== 网格布局兼容 ===== */
@supports not (display: grid) {
  .product-grid,
  .solution-grid,
  .case-grid,
  .news-grid,
  .industry-grid,
  .testimonial-grid,
  .article-list,
  .stats-row,
  .brand-grid,
  .contact-grid,
  .sitemap-grid,
  .footer-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
  }

  .product-card,
  .solution-card,
  .case-card,
  .news-card,
  .industry-item,
  .testimonial,
  .article-item,
  .stat-item {
    flex: 1 1 280px;
  }
}