/* roulang page: index */
:root {
      --primary-black: #1C1E21;
      --accent-orange: #F15A24;
      --accent-orange-dark: #D94A1A;
      --warm-gray: #F5F3EF;
      --white: #FFFFFF;
      --text-body: #3A3C40;
      --text-muted: #7A7C80;
      --gold: #C9A96E;
      --border-light: #E5E3DF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-number: 'DIN Alternate', 'Bebas Neue', 'Oswald', sans-serif;
      --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--warm-gray);
      color: var(--text-body);
      line-height: 1.75;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-img);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, input, textarea {
      font-family: inherit;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(245, 243, 239, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
      height: 72px;
    }
    .navbar.scrolled {
      background: rgba(245, 243, 239, 0.98);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary-black);
      letter-spacing: 0.5px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--accent-orange);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 20px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-body);
      font-size: 15px;
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--accent-orange);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--accent-orange);
      transition: width 0.2s;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent-orange);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 4px 10px rgba(241,90,36,0.25);
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--accent-orange-dark);
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(241,90,36,0.3);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .hamburger span {
      display: block;
      width: 28px;
      height: 3px;
      background: var(--primary-black);
      border-radius: 2px;
      transition: 0.3s;
    }
    .hamburger span.short {
      width: 20px;
      margin-left: 8px;
    }
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--warm-gray);
        flex-direction: column;
        align-items: flex-start;
        padding: 24px;
        gap: 20px;
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-light);
      }
      .nav-menu.active {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        width: 100%;
        text-align: center;
        padding: 14px 24px;
      }
      .navbar {
        height: 64px;
      }
      .nav-container {
        height: 64px;
      }
    }
    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: var(--warm-gray);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-family: var(--font-title);
      font-size: 56px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.03em;
      color: var(--primary-black);
      margin-bottom: 20px;
    }
    .hero-content .subtitle {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 28px;
      max-width: 90%;
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 38px;
      font-weight: 700;
      color: var(--accent-orange);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 4px 12px rgba(241,90,36,0.2);
    }
    .btn-primary:hover {
      background: var(--accent-orange-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(241,90,36,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-orange);
      color: var(--accent-orange);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
    }
    .btn-outline:hover {
      background: rgba(241,90,36,0.06);
      transform: translateY(-2px);
    }
    .hero-image img {
      width: 100%;
      border-radius: 16px;
      box-shadow: var(--shadow-md);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-content h1 {
        font-size: 40px;
      }
    }
    @media (max-width: 520px) {
      .hero-content h1 {
        font-size: 34px;
      }
      .hero-stats {
        gap: 20px;
      }
    }
    /* 板块通用 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-family: var(--font-title);
      font-size: 40px;
      font-weight: 700;
      color: var(--primary-black);
      margin-bottom: 16px;
      letter-spacing: -0.02em;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 17px;
    }
    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      font-size: 36px;
      color: var(--accent-orange);
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--primary-black);
    }
    /* 场景 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .scenario-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition);
    }
    .scenario-card:hover {
      transform: translateY(-4px);
    }
    .scenario-img {
      height: 240px;
      overflow: hidden;
    }
    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .scenario-card:hover .scenario-img img {
      transform: scale(1.03);
    }
    .scenario-text {
      padding: 24px;
    }
    /* 案例横向滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .cases-scroll::-webkit-scrollbar {
      display: none;
    }
    .case-card {
      flex: 0 0 300px;
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      scroll-snap-align: start;
    }
    .case-card img {
      width: 100%;
      height: 160px;
      object-fit: cover;
      margin-bottom: 16px;
    }
    /* 价格卡 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .pricing-card {
      background: var(--white);
      padding: 36px 24px;
      border-radius: var(--radius-card);
      text-align: center;
      box-shadow: var(--shadow-sm);
      border: 2px solid transparent;
      transition: transform var(--transition);
    }
    .pricing-card.featured {
      border-color: var(--accent-orange);
      transform: scale(1.02);
    }
    .pricing-card:hover {
      transform: translateY(-4px);
    }
    .price {
      font-family: var(--font-number);
      font-size: 44px;
      color: var(--accent-orange);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 0;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--primary-black);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }
    .faq-answer.open {
      max-height: 300px;
      padding-bottom: 16px;
    }
    /* CTA尾板 */
    .cta-dark {
      background: var(--primary-black);
      color: white;
      padding: 80px 0;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .cta-form input {
      flex: 1;
      padding: 14px;
      border-radius: var(--radius-btn);
      border: none;
    }
    .footer {
      background: #1C1E21;
      color: #B0B2B5;
      padding: 60px 0 20px;
    }
    @media (max-width: 768px) {
      .features-grid, .scenarios-grid, .pricing-grid {
        grid-template-columns: 1fr;
      }
    }