/* roulang page: index */
:root {
      --primary: #1A3C2A;
      --primary-deep: #0F261B;
      --accent: #FF6B35;
      --accent-hover: #e55a2b;
      --warm-yellow: #FFD166;
      --bg-light: #F5F7F5;
      --bg-white: #FFFFFF;
      --text-main: #0F261B;
      --text-body: #2D3A30;
      --text-muted: #5A6B5E;
      --border-light: rgba(15, 38, 27, 0.08);
      --shadow-card: 0 2px 12px rgba(15,38,27,0.06);
      --shadow-hover: 0 8px 24px rgba(15,38,27,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(6px);
      z-index: 100;
      border-bottom: 1px solid var(--border-light);
      transition: box-shadow 0.3s;
    }
    .header.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
      font-size: 1rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--primary);
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: var(--primary);
      padding: 24px;
      flex-direction: column;
      gap: 20px;
      z-index: 99;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.2rem;
      font-weight: 500;
    }
    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: radial-gradient(circle at 20% 30%, #1A3C2A 0%, #0F261B 100%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.12;
      mix-blend-mode: overlay;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }
    .hero-left h1 {
      font-size: 3rem;
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-left .subtitle {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2rem;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 1.5rem;
    }
    .trust-badge {
      display: flex;
      align-items: center;
      gap: 12px;
      color: rgba(255,255,255,0.8);
    }
    .stars {
      color: var(--warm-yellow);
    }
    .hero-right img {
      max-width: 360px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .section-desc {
      color: var(--text-muted);
      max-width: 600px;
      margin-bottom: 40px;
    }
    /* 亮点网格 非对称 */
    .features-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .feature-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 2rem;
      margin-bottom: 16px;
      color: var(--accent);
    }
    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .metric {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
      margin-top: 12px;
    }
    /* 产品横向滚动 */
    .scroll-container {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .scroll-container::-webkit-scrollbar {
      height: 6px;
    }
    .scroll-container::-webkit-scrollbar-thumb {
      background: var(--primary);
      border-radius: 10px;
    }
    .product-card {
      flex: 0 0 280px;
      scroll-snap-align: start;
      background: white;
      border-radius: var(--radius-card);
      padding: 20px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }
    .product-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .product-card img {
      width: 100%;
      height: 140px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 12px;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin: 10px 0;
    }
    .tag {
      font-size: 0.75rem;
      padding: 4px 10px;
      border: 1px solid var(--accent);
      color: var(--accent);
      border-radius: 20px;
      font-weight: 500;
    }
    /* 案例瀑布 */
    .masonry {
      column-count: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .masonry-item:hover {
      transform: scale(1.01);
      box-shadow: var(--shadow-hover);
    }
    .masonry-item img {
      width: 100%;
      display: block;
    }
    .case-content {
      padding: 16px;
    }
    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 0;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .compare-col {
      flex: 1;
      padding: 32px 24px;
    }
    .compare-col.left {
      background: #f0f2f0;
    }
    .compare-col.right {
      background: var(--primary);
      color: white;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .right .compare-item {
      border-bottom: 1px solid rgba(255,255,255,0.2);
    }
    /* FAQ */
    .faq-group {
      margin-bottom: 32px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
      overflow: hidden;
    }
    .faq-question {
      display: flex;
      align-items: center;
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #f9fbf9;
      padding: 0 24px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }
    /* CTA 尾屏 */
    .cta-section {
      background: radial-gradient(circle at 30% 40%, #1A3C2A, #0A1E14);
      color: white;
      text-align: center;
      padding: 80px 24px;
    }
    .footer {
      background: var(--primary-deep);
      color: #d0d7d3;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 1024px) {
      .features-grid { grid-template-columns: 1fr 1fr; }
      .masonry { column-count: 2; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-left h1 { font-size: 2.4rem; }
      .features-grid { grid-template-columns: 1fr; }
      .compare-table { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .masonry { column-count: 1; }
      .section { padding: 48px 0; }
    }
    @media (max-width: 480px) {
      .container { padding: 0 16px; }
      .hero-buttons .btn-primary, .hero-buttons .btn-outline { width: 100%; }
    }