/* roulang page: index */
:root {
      --primary: #C43E2C;
      --primary-soft: #FDF2F0;
      --secondary: #1E1E1E;
      --accent: #E8A840;
      --accent-hover: #D4952E;
      --bg: #FAF7F4;
      --card-bg: #FFFFFF;
      --border: #E8E2DA;
      --text: #3A3A3A;
      --muted: #6B6B6B;
      --success: #2D6A4F;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 6px 20px rgba(0,0,0,0.08);
      --font-title: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: var(--font-title);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 浮动 Dock 导航 */
    .float-dock {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 720px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: 40px;
      box-shadow: 0 4px 24px rgba(0,0,0,0.06);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 8px 24px;
      z-index: 1000;
      border: 1px solid rgba(255,255,255,0.5);
    }

    .dock-logo {
      font-weight: 700;
      font-size: 1.3rem;
      color: var(--primary);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }

    .dock-nav {
      display: flex;
      gap: 24px;
      align-items: center;
      list-style: none;
    }

    .dock-nav a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--secondary);
      padding: 6px 4px;
      border-bottom: 2px solid transparent;
      transition: all var(--transition);
      white-space: nowrap;
    }

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

    .dock-cta {
      background: var(--accent);
      color: var(--secondary) !important;
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 0.9rem;
      transition: background var(--transition);
      white-space: nowrap;
      border: none;
      cursor: pointer;
    }

    .dock-cta:hover {
      background: var(--accent-hover);
    }

    .hamburger {
      display: none;
      font-size: 1.6rem;
      cursor: pointer;
      color: var(--secondary);
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    @media (max-width: 1024px) {
      section {
        padding: 70px 0;
      }
    }

    @media (max-width: 640px) {
      section {
        padding: 60px 0;
      }
      .float-dock {
        width: 95%;
        max-width: none;
        justify-content: space-between;
      }
      .dock-nav {
        display: none;
      }
      .dock-cta.desktop {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 80px;
        left: 5%;
        width: 90%;
        background: rgba(255,255,255,0.96);
        backdrop-filter: blur(16px);
        border-radius: 24px;
        box-shadow: var(--shadow-md);
        flex-direction: column;
        gap: 18px;
        padding: 28px;
        z-index: 999;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        font-size: 1.1rem;
        font-weight: 500;
        color: var(--secondary);
      }
    }

    /* Hero */
    .hero {
      min-height: 75vh;
      display: flex;
      align-items: center;
      background: linear-gradient(180deg, #FAF7F4 0%, #FFFFFF 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 400px;
    }
    .hero-right {
      flex: 1 1 400px;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .hero-right img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    h1 {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--secondary);
      letter-spacing: -0.5px;
      line-height: 1.3;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--muted);
      margin: 20px 0 28px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: var(--secondary);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 40px;
      border: none;
      font-size: 1rem;
      transition: background var(--transition);
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 40px;
      transition: background var(--transition);
    }
    .btn-secondary:hover {
      background: var(--primary-soft);
    }

    @media (max-width: 640px) {
      h1 {
        font-size: 2rem;
      }
      .hero-right {
        order: -1;
      }
    }

    /* 优势不对称栅格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .adv-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .adv-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 18px;
    }
    .adv-title {
      font-weight: 600;
      font-size: 1.2rem;
      margin-bottom: 12px;
    }
    @media (max-width: 1024px) {
      .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 功能交替 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }
    .feature-text {
      flex: 1 1 300px;
    }
    .feature-img {
      flex: 1 1 300px;
      border-radius: var(--radius-md);
      overflow: hidden;
      height: 280px;
    }
    .feature-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .feature-list {
      list-style: none;
      margin-top: 18px;
    }
    .feature-list li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text);
    }
    .feature-list i {
      color: var(--primary);
    }
    @media (max-width: 640px) {
      .feature-row {
        flex-direction: column;
      }
    }

    /* 场景大卡片 */
    .scenario-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      display: flex;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      margin-bottom: 32px;
    }
    .scenario-img {
      width: 35%;
      min-height: 240px;
      object-fit: cover;
    }
    .scenario-content {
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .tag {
      background: var(--primary-soft);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-top: 12px;
    }
    @media (max-width: 640px) {
      .scenario-card {
        flex-direction: column;
      }
      .scenario-img {
        width: 100%;
        height: 200px;
      }
    }

    /* 案例网格 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-img {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }
    .case-body {
      padding: 24px;
    }
    .case-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent);
    }
    @media (max-width: 1024px) {
      .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 价格卡片 */
    .pricing-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .price-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      flex: 1 1 220px;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .price-card.featured {
      border: 2px solid var(--accent);
      background: #FFF9ED;
    }
    .price {
      font-size: 2rem;
      font-weight: 700;
      margin: 16px 0;
    }

    /* FAQ */
    .accordion-title {
      background: #FAF7F4;
      border-radius: var(--radius-sm);
      padding: 16px 20px;
      font-weight: 600;
      cursor: pointer;
      transition: background var(--transition);
    }
    .accordion-title:hover {
      background: #F0EBE4;
    }
    .accordion-content {
      padding: 0 20px 16px;
    }

    /* 联系表单 */
    .contact-form input,
    .contact-form textarea {
      border-radius: 30px;
      border: 1px solid var(--border);
      padding: 14px 20px;
      margin-bottom: 16px;
      width: 100%;
      background: white;
    }
    .contact-form button {
      background: var(--accent);
      border: none;
      font-weight: 600;
      padding: 14px 36px;
    }

    footer {
      background: var(--secondary);
      color: #B0B0B0;
      padding: 40px 0;
    }