/* roulang page: index */
:root {
      --primary: #0B2B26;
      --primary-light: #1B4D45;
      --accent: #E85D04;
      --accent-hover: #C94A00;
      --bg: #F7F8FA;
      --card-bg: #FFFFFF;
      --text-primary: #0B2B26;
      --text-body: #2D3748;
      --text-muted: #718096;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-img: 12px;
      --radius-btn: 8px;
      --radius-badge: 40px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --transition: 0.2s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    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;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      z-index: 1000;
      transition: box-shadow 0.3s ease;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .navbar.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 1.75rem;
      letter-spacing: -0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--accent);
      font-size: 1.9rem;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      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%;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 1rem;
      min-width: 120px;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      min-width: 120px;
    }
    .btn-outline:hover {
      background: rgba(11,43,38,0.05);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      gap: 3rem;
      position: relative;
    }
    .hero-left {
      flex: 5;
    }
    .hero-right {
      flex: 7;
      position: relative;
    }
    .hero-right img {
      border-radius: 24px;
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .hero-badge-group {
      display: flex;
      gap: 16px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .badge-capsule {
      background: rgba(232,93,4,0.1);
      color: var(--accent);
      padding: 8px 18px;
      border-radius: var(--radius-badge);
      font-weight: 600;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .floating-badge {
      position: absolute;
      bottom: 24px;
      right: 24px;
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
    }
    h1 {
      font-size: clamp(2.5rem, 5vw, 3.2rem);
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--text-primary);
    }
    h2 {
      font-size: 2rem;
      font-weight: 600;
      line-height: 1.3;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .advantage-card {
      background: var(--card-bg);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }
    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-image: linear-gradient(90deg, var(--primary), var(--accent)) 1;
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: rgba(11,43,38,0.06);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 1.8rem;
      transition: 0.2s;
    }
    .advantage-card:hover .icon-circle {
      background: rgba(232,93,4,0.15);
      color: var(--accent);
    }

    /* 产品瀑布流 */
    .product-row {
      display: flex;
      gap: 24px;
      margin-bottom: 32px;
      align-items: center;
    }
    .product-row.reverse {
      flex-direction: row-reverse;
    }
    .product-img {
      flex: 1;
      border-radius: var(--radius-img);
      overflow: hidden;
      transition: transform 0.25s;
    }
    .product-img img {
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
    }
    .product-text {
      flex: 1;
      padding: 16px 0;
    }
    .tag {
      display: inline-block;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      margin-top: 12px;
    }
    .product-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: 0.2s;
    }
    .product-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .product-card:hover .product-img img {
      transform: scale(1.03);
    }

    /* 数据横栏 */
    .trust-bar {
      background: #F0F4F3;
      border-radius: var(--radius-card);
      padding: 48px;
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .big-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: 12px;
      padding: 18px 24px;
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: 0.2s;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .faq-item.active {
      border-left: 4px solid var(--accent);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 120px;
      margin-top: 12px;
    }

    /* CTA 横幅 */
    .cta-band {
      background: linear-gradient(135deg, #0B2B26 0%, #1B4D45 100%);
      border-radius: 24px;
      padding: 64px 32px;
      text-align: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .cta-band::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.05) 0%, transparent 30%);
      pointer-events: none;
    }
    .input-group {
      display: flex;
      max-width: 480px;
      margin: 24px auto 0;
      gap: 12px;
    }
    .input-group input {
      flex: 1;
      padding: 14px 18px;
      border-radius: 8px;
      border: none;
      font-size: 1rem;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #CBD5E0;
      padding: 64px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 16px;
      color: #CBD5E0;
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--accent);
    }

    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        padding: 120px 0 60px;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .trust-bar {
        flex-direction: column;
        text-align: center;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .grid-3, .faq-grid {
        grid-template-columns: 1fr;
      }
      .product-row, .product-row.reverse {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .mobile-menu {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.7);
      backdrop-filter: blur(8px);
      display: none;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 999;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.5rem;
      margin: 16px 0;
    }