/* roulang page: index */
:root {
      --primary: #00C9A7;
      --primary-dark: #00B294;
      --secondary: #1A0F2E;
      --secondary-dark: #0D0818;
      --accent: #FF6B35;
      --bg-light: #F4FAF8;
      --bg-white: #FFFFFF;
      --text-primary: #1A1A2E;
      --text-secondary: #4A4A5E;
      --text-muted: #7A7A8E;
      --text-on-dark: #E6F7F3;
      --border-light: rgba(0,0,0,0.04);
      --border-medium: rgba(0,0,0,0.08);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-btn: 50px;
      --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      --font-mono: 'SF Mono', 'Roboto Mono', 'Courier New', monospace;
      --max-width: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-white);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
      transition: all var(--transition);
      white-space: nowrap;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      height: var(--header-height);
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-light);
      transition: box-shadow 0.3s;
    }

    .header.scrolled {
      box-shadow: 0 8px 24px rgba(0,0,0,0.06);
    }

    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.5rem;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }

    .logo svg {
      width: 36px;
      height: 36px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

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

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-size: 0.95rem;
      box-shadow: 0 4px 12px rgba(0,201,167,0.3);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 20px rgba(0,201,167,0.4);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 10px 28px;
    }

    .btn-outline:hover {
      background: rgba(0,201,167,0.06);
      transform: translateY(-1px);
    }

    .btn-accent {
      background: var(--accent);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-size: 1rem;
      box-shadow: 0 8px 20px rgba(255,107,53,0.3);
    }

    .btn-accent:hover {
      background: #E85A2C;
      box-shadow: 0 12px 24px rgba(255,107,53,0.45);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: none;
      border: none;
      width: 32px;
    }

    .hamburger span {
      display: block;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 4px;
      transition: all 0.3s;
    }

    /* 移动端导航 */
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: linear-gradient(135deg, #00C9A7 0%, #1A0F2E 100%);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 40px;
        transform: translateX(100%);
        transition: transform 0.4s ease;
        z-index: 999;
      }
      .mobile-menu.active {
        transform: translateX(0);
      }
      .mobile-menu a {
        color: white;
        font-size: 1.6rem;
        font-weight: 700;
      }
      .mobile-menu .btn-primary {
        background: white;
        color: var(--primary);
      }
    }

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

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .container {
        padding: 0 20px;
      }
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--secondary);
    }

    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(180deg, #FFFFFF 0%, #F4FAF8 100%);
      position: relative;
      overflow: hidden;
    }

    .hero .container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      color: var(--secondary);
      margin-bottom: 20px;
    }

    .hero-highlight {
      color: var(--primary);
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }

    .hero-stats {
      display: flex;
      gap: 36px;
      margin-top: 40px;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-visual img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-hover);
    }

    @media (max-width: 1024px) {
      .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-stats {
        justify-content: center;
      }
      .hero-visual {
        order: -1;
      }
    }

    /* 价值主张 */
    .value-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .value-card {
      background: var(--bg-white);
      padding: 40px 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: all var(--transition);
    }

    .value-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover), 0 0 0 2px rgba(0,201,167,0.15);
    }

    .value-icon {
      font-size: 2.4rem;
      color: var(--primary);
      margin-bottom: 20px;
    }

    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--bg-white);
      padding: 36px 28px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: all var(--transition);
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover), 0 0 0 2px rgba(0,201,167,0.2);
    }

    @media (max-width: 768px) {
      .value-grid, .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .scenario-card img {
      border-radius: var(--radius-sm);
      transition: transform 0.4s ease;
    }

    .scenario-card:hover img {
      transform: scale(1.03);
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--bg-white);
      padding: 28px;
      border-radius: var(--radius-sm);
      text-align: center;
    }

    @media (max-width: 1024px) {
      .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-medium);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #1A0F2E 0%, #0D0818 100%);
      color: white;
      text-align: center;
      position: relative;
    }

    .footer {
      background: #1A0F2E;
      color: #B0C7C0;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .scenarios-grid, .cases-grid {
        grid-template-columns: 1fr;
      }
    }