/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary: #1D3557;
      --secondary-light: #264b73;
      --accent: #F4A261;
      --bg: #F8F9FA;
      --text: #2B2D42;
      --text-light: #6C757D;
      --border: #DEE2E6;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --radius-lg: 12px;
      --radius-md: 8px;
      --transition: 0.2s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background: var(--white);
      color: var(--text);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: clamp(2.5rem, 6vw, 4rem);
      font-weight: 800;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: clamp(2rem, 5vw, 2.75rem);
      margin-bottom: 1rem;
    }

    h3 {
      font-size: clamp(1.3rem, 3vw, 1.75rem);
      font-weight: 600;
    }

    p {
      color: var(--text-light);
      margin-bottom: 1rem;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
      border: none;
      min-height: 48px;
      min-width: 120px;
      text-align: center;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 10px rgba(230, 57, 70, 0.2);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: scale(1.03);
      box-shadow: 0 8px 20px rgba(230, 57, 70, 0.3);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
      transform: scale(1.03);
    }

    .btn-accent {
      background: var(--accent);
      color: var(--secondary);
      font-weight: 700;
    }

    .btn-accent:hover {
      background: #e08620;
      transform: scale(1.03);
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: white;
      box-shadow: 0 2px 8px rgba(0,0,0,0.05);
      transition: box-shadow 0.2s;
    }

    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
      padding: 0 20px;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--secondary);
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }

    .logo i {
      color: var(--primary);
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
      align-items: center;
    }

    .nav-links a {
      color: var(--text);
      font-weight: 500;
      transition: color var(--transition);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      cursor: pointer;
      background: none;
      border: none;
      padding: 10px;
    }

    .hamburger span {
      width: 25px;
      height: 3px;
      background: var(--secondary);
      margin: 3px 0;
      border-radius: 3px;
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        box-shadow: var(--shadow-md);
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        z-index: 99;
      }
      .nav-links.active {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
      .navbar {
        height: 56px;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, var(--secondary) 0%, #15304a 50%, var(--primary) 100%);
      position: relative;
      min-height: 90vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: white;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.2;
      mix-blend-mode: overlay;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      padding: 2rem;
    }

    .hero h1 {
      margin-bottom: 1.5rem;
      text-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }

    .hero .subtitle {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.9);
      margin-bottom: 2.5rem;
      line-height: 1.6;
    }

    .hero-buttons {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    @media (max-width: 576px) {
      .hero {
        min-height: 80vh;
      }
      .hero-buttons {
        flex-direction: column;
        align-items: center;
      }
    }

    /* 板块通用 */
    .section {
      padding: 80px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    .section-title h2 {
      color: var(--secondary);
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }

    /* 卡片 */
    .card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition);
    }

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

    .card-icon {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 1rem;
    }

    .card h3 {
      color: var(--secondary);
      margin-bottom: 0.75rem;
    }

    /* 功能分组交替 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }

    .feature-row.reverse {
      flex-direction: row-reverse;
    }

    .feature-text {
      flex: 1;
    }

    .feature-image {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .feature-image img {
      width: 100%;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    .feature-list {
      list-style: none;
      margin-top: 1rem;
    }

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin-bottom: 0.75rem;
      color: var(--text);
    }

    .feature-list li i {
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse {
        flex-direction: column;
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
    }

    /* 场景卡片 */
    .scenario-card {
      text-align: left;
    }

    .scenario-card img {
      border-radius: var(--radius-md) var(--radius-md) 0 0;
      aspect-ratio: 16/10;
      object-fit: cover;
      width: 100%;
    }

    .tag {
      background: var(--accent);
      color: var(--secondary);
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin: 0.5rem 0;
    }

    /* 案例数据卡 */
    .case-card {
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .case-number {
      font-family: var(--font-number);
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1;
    }

    .industry-tag {
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 2px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* 价格卡 */
    .pricing-card {
      position: relative;
      text-align: center;
    }

    .pricing-card.recommended {
      border: 2px solid var(--primary);
    }

    .badge {
      background: var(--primary);
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
      position: absolute;
      top: -15px;
      left: 50%;
      transform: translateX(-50%);
    }

    .price {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 800;
      color: var(--secondary);
      margin: 1rem 0;
    }

    .feature-list-check li {
      list-style: none;
      margin: 0.75rem 0;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: var(--text);
    }

    .feature-list-check i {
      color: var(--primary);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 1.2rem 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--secondary);
      font-size: 1.15rem;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      color: var(--text-light);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 1rem;
    }

    .faq-icon {
      color: var(--primary);
    }

    /* CTA 横幅 */
    .cta-band {
      background: var(--secondary);
      color: white;
      text-align: center;
      padding: 4rem 1rem;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: rgba(255,255,255,0.8);
      padding: 3rem 0 1rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 2rem;
      margin-bottom: 2rem;
    }

    .footer h4 {
      color: white;
      margin-bottom: 1rem;
      font-size: 1.1rem;
    }

    .footer a {
      color: rgba(255,255,255,0.7);
      transition: color var(--transition);
      display: block;
      margin-bottom: 0.5rem;
    }

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

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.2);
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
    }

    @media (max-width: 576px) {
      .section {
        padding: 60px 0;
      }
      .case-card {
        flex-direction: column;
        text-align: center;
      }
    }