:root {
  --primary: #0284c7;
  --primary-light: #0ea5e9;
  --primary-glow: #e0f2fe;
  --accent: #f59e0b;
  --accent-light: #fef3c7;
  --text-main: #0f172a;
  --text-muted: #475569;
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 20px -2px rgba(14, 165, 233, 0.08), 0 2px 6px -1px rgba(0,0,0,0.04);
  --shadow-hover: 0 12px 30px -4px rgba(14, 165, 233, 0.15), 0 4px 12px -2px rgba(0,0,0,0.05);
  --transition: all 0.28s ease;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-box {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-box img {
  height: 38px;
  width: auto;
  display: block;
}

.brand-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  color: #ffffff !important;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(2, 132, 199, 0.35);
}

.btn-outline {
  border-color: var(--primary);
  color: var(--primary) !important;
  background: #ffffff;
}

.btn-outline:hover {
  background: var(--primary-glow);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-main);
  cursor: pointer;
  padding: 4px;
}

/* 首屏 Hero (无图，纯CSS渐变几何) */
.hero-section {
  position: relative;
  padding: 90px 0 70px;
  background: radial-gradient(circle at 80% 20%, #e0f2fe 0%, #f0f9ff 40%, #f8fafc 100%);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.hero-content {
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 2.6rem;
  line-height: 1.25;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-actions .btn {
  padding: 14px 32px;
  font-size: 1.05rem;
}

.hero-highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  text-align: left;
}

.highlight-card {
  background: #ffffff;
  border: 1px solid var(--border);
  padding: 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.highlight-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.highlight-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
  display: block;
}

.highlight-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* 模块通用样式 */
.section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border);
}

.section-alt {
  background-color: #ffffff;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
}

/* 平台介绍 */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.intro-text h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.intro-text p {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.intro-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.intro-list li {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.intro-list li::before {
  content: "✓";
  color: var(--primary);
  font-weight: 800;
}

.intro-visual {
  background: linear-gradient(135deg, #e0f2fe, #bae6fd);
  padding: 30px;
  border-radius: var(--radius-lg);
  border: 1px solid #7dd3fc;
}

.model-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.model-tag {
  background: #ffffff;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

/* 服务矩阵与场景 */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--primary-glow);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  flex-grow: 1;
}

/* 素材图展示容器 */
.media-preview-box {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #ffffff;
  margin-top: 30px;
}

.media-gallery {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 16px;
  padding: 16px;
}

.media-gallery img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
  display: block;
}

/* 标准流程 */
.flow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}

.step-box {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  position: relative;
}

.step-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--primary-light);
  line-height: 1;
  margin-bottom: 12px;
  opacity: 0.7;
}

.step-box h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-box p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 对比评测 */
.score-badge-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-bottom: 30px;
  background: linear-gradient(135deg, #fef3c7, #fffbeb);
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid #fde68a;
}

.score-badge-item {
  text-align: center;
}

.score-badge-item .val {
  font-size: 1.8rem;
  font-weight: 900;
  color: #b45309;
}

.score-badge-item .lbl {
  font-size: 0.85rem;
  color: #78350f;
  font-weight: 600;
}

.table-wrap {
  overflow-x: auto;
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.table-custom {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 600px;
}

.table-custom th, .table-custom td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.table-custom th {
  background-color: #f8fafc;
  font-weight: 700;
  color: var(--text-main);
}

.table-custom td.highlight-col {
  background-color: #f0fdf4;
  font-weight: 600;
  color: #166534;
}

/* 客户评论 */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.testimonial-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  font-style: italic;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 12px;
}

.avatar-circle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--primary-glow);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.user-info h5 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

.user-info span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* FAQ 手风琴 */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  padding: 16px 20px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question::after {
  content: "+";
  font-size: 1.2rem;
  color: var(--primary);
  transition: var(--transition);
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  padding: 0 20px;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 16px;
}

/* 资讯与百科 */
.articles-section {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 30px;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.article-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition);
}

.article-item:hover {
  border-color: var(--primary);
  background: var(--primary-glow);
  color: var(--primary);
}

.article-item span {
  font-size: 0.9rem;
  font-weight: 500;
}

.article-item time {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* 宣传海报展播区 */
.banner-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 30px;
}

.banner-gallery img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  display: block;
}

/* 表单与联系区 */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 30px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 20px;
}

.contact-item-icon {
  font-weight: 700;
  color: var(--primary);
  font-size: 1.1rem;
}

.contact-item-detail h5 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.contact-item-detail p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.contact-qr {
  margin-top: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--bg-main);
  border-radius: var(--radius-sm);
}

.contact-qr img {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.form-box {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 30px;
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-main);
  outline: none;
  transition: var(--transition);
  background: #ffffff;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

textarea.form-control {
  resize: vertical;
  min-height: 90px;
}

/* 友情链接与页脚 */
.site-footer {
  background-color: #0f172a;
  color: #94a3b8;
  padding: 60px 0 30px;
  border-top: 1px solid #1e293b;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid #1e293b;
}

.footer-brand h4 {
  color: #ffffff;
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.6;
  max-width: 360px;
}

.footer-col h5 {
  color: #f1f5f9;
  font-size: 0.95rem;
  margin-bottom: 14px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.85rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: #ffffff;
}

.friend-links-box {
  padding: 24px 0;
  border-bottom: 1px solid #1e293b;
}

.friend-links-title {
  color: #cbd5e1;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.friend-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.friend-links-list a {
  color: #64748b;
  text-decoration: none;
  font-size: 0.8rem;
  transition: var(--transition);
}

.friend-links-list a:hover {
  color: #38bdf8;
}

.footer-bottom {
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: #64748b;
}

.footer-bottom a {
  color: #64748b;
  text-decoration: none;
}

.footer-bottom a:hover {
  color: #94a3b8;
}

/* 浮动客服 */
.floating-widget {
  position: fixed;
  right: 20px;
  bottom: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.float-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  cursor: pointer;
  text-decoration: none;
  font-size: 1.2rem;
  border: none;
  transition: var(--transition);
}

.float-btn:hover {
  transform: scale(1.08);
  background: var(--primary-light);
}

/* 响应式断点 */
@media (max-width: 992px) {
  .hero-highlights, .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3, .flow-steps, .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .intro-grid, .contact-wrap, .articles-section, .footer-top {
    grid-template-columns: 1fr;
  }
  .banner-gallery {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn-outline {
    display: none;
  }
  .nav-toggle {
    display: block;
  }
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    padding: 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }
  .hero-title {
    font-size: 2rem;
  }
  .hero-highlights, .grid-3, .grid-4, .flow-steps, .testimonials-grid, .faq-grid {
    grid-template-columns: 1fr;
  }
  .media-gallery {
    grid-template-columns: 1fr;
  }
  .banner-gallery {
    grid-template-columns: 1fr 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }
}