:root {
  --bg-body: #F4F6F9;
  --bg-card: #FFFFFF;
  --bg-nav: #0B1E33;
  --bg-footer: #0A1628;
  --bg-banner: linear-gradient(135deg, #0B1E33 0%, #1B3A5C 100%);
  --bg-tag: #E8EEF5;
  --bg-faq: #FFFFFF;
  --bg-table-head: #E2E8F0;
  --bg-input: #FFFFFF;
  --text-primary: #17202A;
  --text-secondary: #334155;
  --text-muted: #475569;
  --text-heading: #0B1E33;
  --text-nav: #F0F4F8;
  --text-nav-hover: #FFFFFF;
  --text-footer: #CBD5E1;
  --text-footer-heading: #F8FAFC;
  --text-link: #1D4ED8;
  --text-link-hover: #1E3A8A;
  --text-btn: #FFFFFF;
  --bg-btn: #1D4ED8;
  --bg-btn-hover: #1E3A8A;
  --border-color: #CBD5E1;
  --shadow-color: rgba(0, 0, 0, 0.08);
  --accent: #1D4ED8;
  --accent-dark: #1E3A8A;
  --success: #166534;
  --warning: #92400E;
  --tag-text: #1E293B;
  --placeholder: #64748B;
  --focus-ring: #2563EB;
  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(255, 255, 255, 0.35);
  --glass-shadow: 0 8px 32px rgba(11, 30, 51, 0.12);
  --card-radius: 16px;
  --card-radius-sm: 12px;
  --nav-height: 64px;
  --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-body: #0F172A;
  --bg-card: #1E293B;
  --bg-nav: #0B1220;
  --bg-footer: #0A0F1A;
  --bg-banner: linear-gradient(135deg, #0B1220 0%, #1E293B 100%);
  --bg-tag: #334155;
  --bg-faq: #1E293B;
  --bg-table-head: #334155;
  --bg-input: #1E293B;
  --text-primary: #E5E7EB;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --text-heading: #F8FAFC;
  --text-nav: #E2E8F0;
  --text-nav-hover: #FFFFFF;
  --text-footer: #94A3B8;
  --text-footer-heading: #F1F5F9;
  --text-link: #93C5FD;
  --text-link-hover: #BFDBFE;
  --text-btn: #FFFFFF;
  --bg-btn: #2563EB;
  --bg-btn-hover: #1D4ED8;
  --border-color: #475569;
  --shadow-color: rgba(0, 0, 0, 0.4);
  --accent: #3B82F6;
  --accent-dark: #2563EB;
  --success: #4ADE80;
  --warning: #FBBF24;
  --tag-text: #E2E8F0;
  --placeholder: #94A3B8;
  --focus-ring: #60A5FA;
  --glass-bg: rgba(30, 41, 59, 0.72);
  --glass-border: rgba(148, 163, 184, 0.2);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.75;
  font-size: 16px;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--text-link-hover);
  text-decoration: underline;
}

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============ 导航栏 ============ */
.navbar {
  background-color: var(--bg-nav);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 12px var(--shadow-color);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.navbar::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(96, 165, 250, 0.5), transparent);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  gap: 16px;
}

.nav-logo {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-nav);
  letter-spacing: 0.5px;
  white-space: nowrap;
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.nav-logo:hover {
  transform: scale(1.03);
}

.nav-logo span {
  color: #60A5FA;
  background: linear-gradient(135deg, #60A5FA, #93C5FD);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
  align-items: center;
  flex-wrap: nowrap;
}

.nav-links a {
  color: var(--text-nav);
  font-size: 14.5px;
  padding: 8px 12px;
  border-radius: 8px;
  transition: background-color var(--transition-base), color var(--transition-base), transform var(--transition-base);
  font-weight: 500;
  white-space: nowrap;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: linear-gradient(90deg, #60A5FA, #93C5FD);
  border-radius: 2px;
  transition: transform var(--transition-base);
}

.nav-links a:hover {
  background-color: rgba(255, 255, 255, 0.12);
  color: var(--text-nav-hover);
  text-decoration: none;
  transform: translateY(-1px);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-search {
  display: flex;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 3px 10px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  transition: border-color var(--transition-base), background-color var(--transition-base), box-shadow var(--transition-base);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.nav-search:focus-within {
  border-color: rgba(96, 165, 250, 0.6);
  background-color: rgba(255, 255, 255, 0.16);
  box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.15);
}

.nav-search input {
  background: transparent;
  border: none;
  color: var(--text-nav);
  font-size: 14px;
  outline: none;
  width: 120px;
  padding: 6px 4px;
  transition: width var(--transition-base);
}

.nav-search input:focus {
  width: 160px;
}

.nav-search input::placeholder {
  color: rgba(255, 255, 255, 0.55);
}

.nav-search button {
  background: transparent;
  border: none;
  color: var(--text-nav);
  cursor: pointer;
  font-size: 15px;
  padding: 4px 6px;
  transition: transform var(--transition-base);
  line-height: 1;
}

.nav-search button:hover {
  transform: scale(1.15);
}

.theme-toggle {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--text-nav);
  border-radius: 10px;
  padding: 7px 12px;
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 500;
  transition: background-color var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
  white-space: nowrap;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.theme-toggle:hover {
  background-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.35);
}

.mobile-menu-btn {
  display: none;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--text-nav);
  font-size: 20px;
  padding: 5px 11px;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color var(--transition-base), transform var(--transition-base);
  line-height: 1;
}

.mobile-menu-btn:hover {
  background-color: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

/* ============ Banner ============ */
.banner {
  background: var(--bg-banner);
  padding: 80px 0 72px;
  position: relative;
  overflow: hidden;
}

.banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(96, 165, 250, 0.18) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatGlow 8s ease-in-out infinite;
}

.banner::after {
  content: '';
  position: absolute;
  bottom: -40%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(147, 197, 253, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  animation: floatGlow 10s ease-in-out infinite reverse;
}

@keyframes floatGlow {
  0%, 100% {
    transform: translate(0, 0) scale(1);
    opacity: 0.8;
  }
  50% {
    transform: translate(30px, -20px) scale(1.1);
    opacity: 1;
  }
}

.banner-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
}

.banner h1 {
  font-size: 40px;
  line-height: 1.35;
  color: #FFFFFF;
  font-weight: 800;
  margin-bottom: 20px;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.4);
  letter-spacing: -0.5px;
  animation: fadeUp 0.8s ease-out both;
}

.banner p {
  font-size: 17px;
  color: #E2E8F0;
  margin-bottom: 32px;
  line-height: 1.85;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.3);
  animation: fadeUp 0.8s ease-out 0.15s both;
}

.banner-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  animation: fadeUp 0.8s ease-out 0.3s both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.btn-primary {
  display: inline-block;
  background-color: var(--bg-btn);
  color: var(--text-btn);
  padding: 13px 32px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(29, 78, 216, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  background-color: var(--bg-btn-hover);
  color: var(--text-btn);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(29, 78, 216, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-outline {
  display: inline-block;
  background-color: rgba(255, 255, 255, 0.06);
  color: #FFFFFF;
  border: 2px solid rgba(255, 255, 255, 0.7);
  padding: 11px 30px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-base), border-color var(--transition-base), transform var(--transition-base), backdrop-filter var(--transition-base);
  text-decoration: none;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.18);
  border-color: #FFFFFF;
  color: #FFFFFF;
  text-decoration: none;
  transform: translateY(-2px);
}

/* ============ 面包屑 ============ */
.breadcrumb {
  padding: 18px 0;
  font-size: 14px;
  color: var(--text-muted);
  animation: fadeUp 0.6s ease-out both;
}

.breadcrumb a {
  color: var(--text-link);
  transition: color var(--transition-base);
}

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

.breadcrumb span {
  margin: 0 6px;
  color: var(--text-muted);
}

/* ============ 锚点导航 ============ */
.anchor-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 18px 0;
  animation: fadeUp 0.6s ease-out 0.1s both;
}

.anchor-nav a {
  font-size: 13.5px;
  color: var(--text-link);
  background-color: var(--bg-tag);
  padding: 6px 15px;
  border-radius: 20px;
  transition: background-color var(--transition-base), color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  font-weight: 500;
  border: 1px solid transparent;
}

.anchor-nav a:hover {
  background-color: var(--accent);
  color: #FFFFFF;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(29, 78, 216, 0.25);
}

/* ============ 通用区块 ============ */
.section {
  padding: 64px 0;
  position: relative;
}

.section-title {
  font-size: 29px;
  font-weight: 800;
  color: var(--text-heading);
  margin-bottom: 14px;
  line-height: 1.4;
  letter-spacing: -0.3px;
  position: relative;
  padding-left: 18px;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 5px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 720px;
  line-height: 1.75;
}

/* ============ 卡片 - 毛玻璃效果 ============ */
.card {
  background-color: var(--bg-card);
  border-radius: var(--card-radius);
  padding: 28px;
  box-shadow: 0 2px 12px var(--shadow-color);
  border: 1px solid var(--border-color);
  transition: box-shadow var(--transition-base), transform var(--transition-base), background-color 0.3s ease, border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  box-shadow: 0 12px 36px var(--shadow-color);
  transform: translateY(-4px);
  border-color: rgba(29, 78, 216, 0.25);
}

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

.card h3 {
  font-size: 20px;
  color: var(--text-heading);
  margin-bottom: 12px;
  font-weight: 700;
  line-height: 1.45;
}

.card h4 {
  font-size: 17px;
  color: var(--text-heading);
  margin-bottom: 8px;
  font-weight: 600;
}

.card p {
  color: var(--text-primary);
  font-size: 15.5px;
  line-height: 1.85;
}

/* 毛玻璃卡片变体 */
.card.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

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

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* ============ 品牌介绍 ============ */
.brand-intro p {
  font-size: 16px;
  color: var(--text-primary);
  margin-bottom: 18px;
  line-height: 1.9;
}

.brand-intro strong {
  color: var(--text-heading);
  font-weight: 700;
}

/* ============ 统计数据 ============ */
.stat-number {
  font-size: 38px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1.2;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 15px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ============ 产品优势 ============ */
.advantage-icon {
  width: 52px;
  height: 52px;
  margin-bottom: 16px;
  transition: transform var(--transition-base);
}

.card:hover .advantage-icon {
  transform: scale(1.08) rotate(-3deg);
}

/* ============ 解决方案 ============ */
.solution-item {
  border-left: 4px solid var(--accent);
  padding-left: 18px;
  margin-bottom: 20px;
  transition: border-color var(--transition-base), padding-left var(--transition-base);
}

.solution-item:last-child {
  margin-bottom: 0;
}

.solution-item:hover {
  border-color: var(--accent-dark);
  padding-left: 22px;
}

.solution-item h4 {
  font-size: 16.5px;
  color: var(--text-heading);
  margin-bottom: 6px;
  font-weight: 600;
}

.solution-item p {
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.8;
}

/* ============ 案例卡片 ============ */
.case-card {
  background-color: var(--bg-card);
  border-radius: var(--card-radius);
  padding: 0;
  overflow: hidden;
  box-shadow: 0 2px 12px var(--shadow-color);
  border: 1px solid var(--border-color);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
  position: relative;
}

.case-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), #60A5FA);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.case-card:hover {
  box-shadow: 0 16px 40px var(--shadow-color);
  transform: translateY(-6px);
  border-color: rgba(29, 78, 216, 0.25);
}

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

.case-body {
  padding: 26px;
}

.case-body h4 {
  font-size: 18px;
  color: var(--text-heading);
  margin-bottom: 10px;
  font-weight: 700;
  line-height: 1.45;
}

.case-body p {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.8;
}

.case-meta {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--border-color);
}

/* ============ 客户评价 ============ */
.review-card {
  background-color: var(--bg-card);
  border-radius: var(--card-radius);
  padding: 26px;
  box-shadow: 0 2px 12px var(--shadow-color);
  border: 1px solid var(--border-color);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
  position: relative;
}

.review-card::before {
  content: '"';
  position: absolute;
  top: 8px;
  right: 20px;
  font-size: 64px;
  line-height: 1;
  color: var(--accent);
  opacity: 0.12;
  font-family: Georgia, serif;
  pointer-events: none;
}

.review-card:hover {
  box-shadow: 0 12px 32px var(--shadow-color);
  transform: translateY(-4px);
  border-color: rgba(29, 78, 216, 0.2);
}

.review-text {
  font-size: 15.5px;
  color: var(--text-primary);
  line-height: 1.85;
  margin-bottom: 16px;
  font-style: italic;
}

.review-author {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text-heading);
}

.review-role {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ============ 文章列表 ============ */
.article-card {
  background-color: var(--bg-card);
  border-radius: var(--card-radius);
  padding: 26px;
  box-shadow: 0 2px 12px var(--shadow-color);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.article-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #60A5FA);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.article-card:hover {
  box-shadow: 0 14px 36px var(--shadow-color);
  transform: translateY(-5px);
  border-color: rgba(29, 78, 216, 0.25);
}

.article-card:hover::after {
  transform: scaleX(1);
}

.article-date {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-date::before {
  content: '📅';
  font-size: 12px;
}

.article-card h3 {
  font-size: 18px;
  color: var(--text-heading);
  margin-bottom: 12px;
  font-weight: 700;
  line-height: 1.5;
  transition: color var(--transition-base);
}

.article-card:hover h3 {
  color: var(--accent);
}

.article-summary {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.8;
  flex: 1;
  margin-bottom: 16px;
}

.article-more {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-link);
  transition: color var(--transition-base), transform var(--transition-base);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  align-self: flex-start;
}

.article-more:hover {
  color: var(--text-link-hover);
  transform: translateX(4px);
  text-decoration: none;
}

/* ============ FAQ ============ */
.faq-item {
  background-color: var(--bg-faq);
  border-radius: var(--card-radius-sm);
  margin-bottom: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

.faq-item:hover {
  box-shadow: 0 4px 16px var(--shadow-color);
  border-color: rgba(29, 78, 216, 0.2);
}

.faq-item.active {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(29, 78, 216, 0.12);
}

.faq-question {
  padding: 18px 22px;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--text-heading);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  background-color: var(--bg-faq);
  transition: background-color var(--transition-base), color var(--transition-base);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.faq-question:hover {
  background-color: var(--bg-tag);
}

.faq-item.active .faq-question {
  color: var(--accent);
}

.faq-answer {
  padding: 0 22px 20px;
  font-size: 15.5px;
  color: var(--text-primary);
  line-height: 1.9;
  display: none;
  animation: faqSlide 0.3s ease-out;
}

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

.faq-item.active .faq-answer {
  display: block;
}

.faq-toggle {
  font-size: 22px;
  color: var(--text-muted);
  transition: transform var(--transition-base), color var(--transition-base);
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background-color: var(--bg-tag);
  line-height: 1;
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
  color: var(--accent);
  background-color: rgba(29, 78, 216, 0.12);
}

/* ============ HowTo ============ */
.howto-step {
  display: flex;
  gap: 20px;
  margin-bottom: 26px;
  align-items: flex-start;
  transition: transform var(--transition-base);
}

.howto-step:last-child {
  margin-bottom: 0;
}

.howto-step:hover {
  transform: translateX(6px);
}

.step-num {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 17px;
  box-shadow: 0 4px 12px rgba(29, 78, 216, 0.3);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.howto-step:hover .step-num {
  transform: scale(1.1);
  box-shadow: 0 6px 18px rgba(29, 78, 216, 0.4);
}

.step-content h4 {
  font-size: 17px;
  color: var(--text-heading);
  margin-bottom: 6px;
  font-weight: 600;
}

.step-content p {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.85;
}

/* ============ 表格 ============ */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--card-radius-sm);
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 12px var(--shadow-color);
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

th {
  background-color: var(--bg-table-head);
  color: var(--text-heading);
  font-weight: 700;
  padding: 14px 18px;
  text-align: left;
  border-bottom: 2px solid var(--border-color);
  white-space: nowrap;
}

td {
  padding: 13px 18px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-card);
  transition: background-color var(--transition-base);
}

tr:last-child td {
  border-bottom: none;
}

tbody tr:hover td {
  background-color: var(--bg-tag);
}

/* ============ 标签 ============ */
.tag {
  display: inline-block;
  background-color: var(--bg-tag);
  color: var(--tag-text);
  padding: 5px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  margin: 0 6px 6px 0;
  transition: background-color var(--transition-base), color var(--transition-base), transform var(--transition-base);
  border: 1px solid transparent;
}

.tag:hover {
  background-color: var(--accent);
  color: #FFFFFF;
  transform: translateY(-2px);
}

/* ============ 联系信息 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.contact-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  transition: transform var(--transition-base);
}

.contact-item:hover {
  transform: translateX(4px);
}

.contact-icon {
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--bg-tag), rgba(29, 78, 216, 0.08));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--accent);
  transition: background var(--transition-base), transform var(--transition-base);
  border: 1px solid var(--border-color);
}

.contact-item:hover .contact-icon {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  transform: scale(1.08);
}

.contact-item:hover .contact-icon {
  color: #FFFFFF;
}

.contact-item h4 {
  font-size: 15px;
  color: var(--text-heading);
  margin-bottom: 3px;
  font-weight: 600;
}

.contact-item p {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.65;
  word-break: break-word;
}

/* ============ 表单 ============ */
.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 7px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 15px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-input);
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base);
}

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

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 4px rgba(29, 78, 216, 0.12);
  background-color: var(--bg-card);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.7;
}

.form-hint {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ============ 新闻中心 ============ */
.news-item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-color);
  transition: transform var(--transition-base), background-color var(--transition-base);
}

.news-item:last-child {
  border-bottom: none;
}

.news-item:hover {
  transform: translateX(6px);
}

.news-date {
  flex-shrink: 0;
  width: 96px;
  font-size: 13px;
  color: var(--text-muted);
  padding-top: 3px;
  font-weight: 500;
}

.news-content h4 {
  font-size: 16.5px;
  color: var(--text-heading);
  margin-bottom: 5px;
  font-weight: 600;
  line-height: 1.5;
  transition: color var(--transition-base);
}

.news-item:hover .news-content h4 {
  color: var(--accent);
}

.news-content p {
  font-size: 14.5px;
  color: var(--text-primary);
  line-height: 1.75;
}

/* ============ 资质 ============ */
.cert-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background-color: var(--bg-card);
  border-radius: var(--card-radius-sm);
  border: 1px solid var(--border-color);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
}

.cert-item:hover {
  box-shadow: 0 8px 24px var(--shadow-color);
  transform: translateY(-3px);
  border-color: rgba(29, 78, 216, 0.25);
}

.cert-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--bg-tag), rgba(29, 78, 216, 0.08));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform var(--transition-base), background var(--transition-base);
  border: 1px solid var(--border-color);
}

.cert-item:hover .cert-icon {
  transform: scale(1.1) rotate(-5deg);
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #FFFFFF;
}

.cert-item h4 {
  font-size: 15px;
  color: var(--text-heading);
  margin-bottom: 3px;
  font-weight: 600;
}

.cert-item p {
  font-size: 13.5px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============ 页脚 ============ */
.footer {
  background-color: var(--bg-footer);
  color: var(--text-footer);
  padding: 56px 0 26px;
  margin-top: 48px;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(96, 165, 250, 0.4), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 36px;
  margin-bottom: 36px;
}

.footer h4 {
  font-size: 16px;
  color: var(--text-footer-heading);
  margin-bottom: 18px;
  font-weight: 700;
  position: relative;
  padding-bottom: 10px;
}

.footer h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background: linear-gradient(90deg, #60A5FA, transparent);
  border-radius: 2px;
}

.footer p,
.footer li {
  font-size: 14px;
  color: var(--text-footer);
  line-height: 1.95;
}

.footer ul {
  list-style: none;
}

.footer ul li {
  margin-bottom: 4px;
}

.footer ul li a {
  color: var(--text-footer);
  font-size: 14px;
  transition: color var(--transition-base), padding-left var(--transition-base);
  display: inline-block;
}

.footer ul li a:hover {
  color: var(--text-footer-heading);
  padding-left: 4px;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13.5px;
  color: var(--text-footer);
}

.footer-bottom a {
  color: var(--text-footer);
  transition: color var(--transition-base);
}

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

/* ============ 返回顶部 ============ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #FFFFFF;
  border: none;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(29, 78, 216, 0.35);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transition: background-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base);
  opacity: 0;
}

.back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 10px 28px rgba(29, 78, 216, 0.45);
}

.back-to-top:active {
  transform: translateY(-2px) scale(1);
}

.back-to-top.show {
  display: flex;
  opacity: 1;
  animation: popIn 0.3s ease-out;
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: scale(0.6);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============ 滚动动画 ============ */
.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* ============ 焦点样式 ============ */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ============ 选中文本 ============ */
::selection {
  background-color: rgba(29, 78, 216, 0.2);
  color: var(--text-heading);
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 5px;
  border: 2px solid var(--bg-body);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ============ 响应式 - 平板 ============ */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-links a {
    padding: 8px 10px;
    font-size: 14px;
  }

  .nav-search input {
    width: 100px;
  }

  .nav-search input:focus {
    width: 130px;
  }
}

/* ============ 响应式 - 移动端 ============ */
@media (max-width: 900px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--bg-nav);
    flex-direction: column;
    padding: 16px 20px 20px;
    gap: 4px;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    animation: menuSlide 0.25s ease-out;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }

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

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    padding: 12px 14px;
    border-radius: 8px;
  }

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

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

  .nav-search {
    display: none;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

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

  .banner {
    padding: 56px 0 48px;
  }

  .banner h1 {
    font-size: 27px;
  }

  .banner p {
    font-size: 15px;
  }

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

  .section {
    padding: 44px 0;
  }

  .section-title {
    font-size: 23px;
    padding-left: 14px;
  }

  .section-title::before {
    width: 4px;
  }

  .card {
    padding: 22px;
    border-radius: 14px;
  }

  .article-card {
    padding: 22px;
  }

  .news-item {
    flex-direction: column;
    gap: 6px;
  }

  .news-date {
    width: auto;
  }

  .howto-step {
    gap: 14px;
  }

  .step-num {
    width: 38px;
    height: 38px;
    font-size: 15px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }

  .footer {
    padding: 40px 0 22px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ============ 响应式 - 小屏手机 ============ */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .banner {
    padding: 44px 0 38px;
  }

  .banner h1 {
    font-size: 22px;
    margin-bottom: 14px;
  }

  .banner p {
    font-size: 14.5px;
    margin-bottom: 24px;
  }

  .btn-primary,
  .btn-outline {
    width: 100%;
    text-align: center;
    padding: 12px 20px;
  }

  .banner-btns {
    flex-direction: column;
    gap: 10px;
  }

  .section-title {
    font-size: 20px;
  }

  .section-subtitle {
    font-size: 15px;
  }

  .card {
    padding: 18px;
  }

  .card h3 {
    font-size: 18px;
  }

  .article-card h3 {
    font-size: 17px;
  }

  .faq-question {
    font-size: 15.5px;
    padding: 16px 18px;
  }

  .faq-answer {
    padding: 0 18px 16px;
    font-size: 15px;
  }

  .anchor-nav a {
    font-size: 13px;
    padding: 5px 12px;
  }

  .theme-toggle {
    padding: 6px 10px;
    font-size: 13px;
  }

  .nav-logo {
    font-size: 19px;
  }

  .stat-number {
    font-size: 30px;
  }
}

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

  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* ============ 打印样式 ============ */
@media print {
  .navbar,
  .banner,
  .back-to-top,
  .theme-toggle,
  .mobile-menu-btn,
  .nav-search,
  .anchor-nav,
  .footer {
    display: none !important;
  }

  body {
    background: #FFFFFF;
    color: #000000;
  }

  .card,
  .article-card,
  .case-card,
  .review-card {
    box-shadow: none;
    border: 1px solid #CCCCCC;
  }
}