/* roulang page: index */
:root {
      --primary: #E8452D;
      --primary-dark: #C0392B;
      --secondary: #1A1C2B;
      --secondary-light: #2A2D3E;
      --accent-gold: #FFB81C;
      --accent-teal: #00B4A6;
      --bg: #F7F5F2;
      --white: #FFFFFF;
      --gray-100: #F0F0F0;
      --gray-200: #E0E0E0;
      --gray-600: #6B7280;
      --gray-800: #2D2D2D;
      --text-primary: #1A1C2B;
      --text-secondary: #4B5563;
      --font-sans: 'PingFang SC', 'Noto Sans SC', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      --font-mono: 'Inter', 'DIN', 'SF Mono', monospace;
      --radius-lg: 16px;
      --radius-full: 40px;
      --shadow-card: 0 4px 20px rgba(26, 28, 43, 0.08);
      --shadow-card-hover: 0 8px 30px rgba(232, 69, 45, 0.15);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.04);
      --transition: 0.25s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      box-shadow: var(--shadow-nav);
      transition: background var(--transition);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 68px;
    }

    .logo {
      font-weight: 800;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--secondary);
      display: flex;
      align-items: center;
      gap: 6px;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      color: var(--text-secondary);
    }

    .nav-links a {
      transition: color var(--transition);
      font-size: 0.95rem;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-weight: 600;
      border-radius: var(--radius-full);
      transition: all var(--transition);
      cursor: pointer;
      border: none;
      font-family: var(--font-sans);
      font-size: 0.95rem;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 12px rgba(232,69,45,0.3);
    }

    .btn-primary:hover {
      background: #D93E28;
      transform: scale(1.03);
      filter: brightness(1.1);
    }

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

    .btn-outline:hover {
      background: var(--secondary);
      color: white;
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 16px;
        left: 50%;
        transform: translateX(-50%);
        width: calc(100% - 32px);
        max-width: 420px;
        background: rgba(255,255,255,0.92);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-radius: 40px;
        box-shadow: 0 8px 30px rgba(0,0,0,0.12);
        padding: 6px 8px;
        z-index: 110;
        justify-content: space-around;
        align-items: center;
        border: 1px solid rgba(255,255,255,0.5);
      }
      .mobile-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        font-weight: 500;
        color: var(--gray-600);
        padding: 6px 8px;
        border-radius: 30px;
        transition: all var(--transition);
      }
      .mobile-nav a i {
        font-size: 1.2rem;
        margin-bottom: 2px;
      }
      .mobile-nav .cta-mobile {
        background: var(--primary);
        color: white;
        width: 48px;
        height: 48px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        margin-top: -18px;
        box-shadow: 0 6px 18px rgba(232,69,45,0.4);
        animation: pulse 2s infinite;
      }
      @keyframes pulse {
        0% { box-shadow: 0 0 0 0 rgba(232,69,45,0.5); }
        70% { box-shadow: 0 0 0 12px rgba(232,69,45,0); }
        100% { box-shadow: 0 0 0 0 rgba(232,69,45,0); }
      }
      .site-header {
        background: rgba(255,255,255,0.9);
      }
    }

    /* Hero */
    .hero {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #1A1C2B 0%, #2E1F2E 60%, #4A1E1E 100%);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="transparent"/><circle cx="50" cy="50" r="1.5" fill="rgba(255,255,255,0.08)"/></svg>');
      opacity: 0.5;
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-content h1 {
      font-size: 2.8rem;
      font-weight: 800;
      color: white;
      line-height: 1.3;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .hero-content .sub {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 28px;
    }

    .badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 32px;
    }

    .badge {
      background: var(--accent-gold);
      color: var(--secondary);
      padding: 8px 16px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 0.9rem;
      font-family: var(--font-mono);
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .hero-visual {
      background: rgba(255,255,255,0.06);
      border-radius: 24px;
      overflow: hidden;
      backdrop-filter: blur(4px);
    }

    .hero-visual img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 32px;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
      .badge-group {
        justify-content: center;
      }
    }

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

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--secondary);
    }

    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 1.05rem;
    }

    /* 核心优势 左图右文 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }

    .advantage-image img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }

    .advantage-list {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .advantage-item {
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .advantage-item i {
      font-size: 1.8rem;
      color: var(--primary);
      width: 40px;
      text-align: center;
    }

    .advantage-item h3 {
      font-weight: 700;
      margin-bottom: 4px;
    }

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

    /* 功能矩阵卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      border: 1px solid transparent;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-card-hover);
      border-top: 3px solid var(--primary);
    }

    .feature-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .feature-card h3 {
      font-weight: 700;
      margin-bottom: 12px;
    }

    .feature-list {
      list-style: none;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }

    .feature-list li {
      margin-bottom: 6px;
      font-size: 0.9rem;
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 场景横向滚动 */
    .scrolling-wrapper {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
      -webkit-overflow-scrolling: touch;
    }

    .scrolling-wrapper::-webkit-scrollbar {
      display: none;
    }

    .scene-card {
      flex: 0 0 300px;
      scroll-snap-align: start;
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .scene-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .scene-info {
      padding: 16px;
    }

    /* 案例数据看板 */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .case-cards {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .case-item {
      background: white;
      padding: 20px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }

    .kpi-wall {
      background: var(--secondary);
      border-radius: var(--radius-lg);
      padding: 24px;
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 20px;
    }

    .kpi-item {
      text-align: center;
      color: white;
    }

    .kpi-number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-gold);
    }

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

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      border: 1px solid var(--gray-200);
    }

    .faq-question {
      padding: 18px 20px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      background: none;
      width: 100%;
      border: none;
      text-align: left;
      font-family: var(--font-sans);
    }

    .faq-answer {
      padding: 0 20px 18px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active {
      background: #FFF5F3;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--secondary);
      text-align: center;
      padding: 64px 24px;
      border-radius: 24px;
      margin: 60px 0;
    }

    .cta-banner h2 {
      color: white;
      font-size: 2rem;
    }

    .cta-buttons {
      display: flex;
      justify-content: center;
      gap: 20px;
      margin-top: 24px;
      flex-wrap: wrap;
    }

    /* 页脚 */
    .site-footer {
      background: white;
      padding: 48px 0 24px;
      border-top: 1px solid var(--gray-200);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

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