/* roulang page: index */
:root {
      --primary-blue: #0A66F5;
      --accent-red: #FF3B3B;
      --bg-dark: #0D1117;
      --card-glass: rgba(22, 27, 34, 0.85);
      --secondary-bg: #161B22;
      --text-white: #FFFFFF;
      --text-light: #C9D1D9;
      --text-muted: #8B949E;
      --border-subtle: rgba(255,255,255,0.06);
      --border-light: rgba(255,255,255,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-glow: 0 0 20px rgba(10,102,245,0.3);
      --transition-smooth: all 0.25s ease;
      --font-mono: 'SF Mono', 'Menlo', 'Consolas', monospace;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-light);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    @media (max-width: 1024px) {
      .container {
        padding: 0 24px;
      }
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(13, 17, 23, 0.9);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s;
      height: 64px;
      display: flex;
      align-items: center;
    }
    .site-header.scrolled {
      background: rgba(13, 17, 23, 0.98);
      border-bottom: 1px solid var(--border-subtle);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      background: var(--primary-blue);
      padding: 2px 10px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
      color: white;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-light);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-blue);
    }
    .btn-consult {
      background: var(--primary-blue);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-smooth);
      box-shadow: 0 0 12px rgba(10,102,245,0.4);
      border: none;
      cursor: pointer;
      font-size: 0.9rem;
    }
    .btn-consult:hover {
      box-shadow: 0 0 22px rgba(10,102,245,0.7);
      transform: translateY(-2px);
    }
    .mobile-toggle {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: rgba(13,17,23,0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 24px;
        gap: 24px;
        display: none;
        border-bottom: 1px solid var(--border-subtle);
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        font-size: 1.2rem;
        color: var(--text-white);
      }
    }

    /* 首屏 Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 5;
    }
    .hero-right {
      flex: 7;
      position: relative;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--text-white);
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-blue);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 15px rgba(10,102,245,0.5);
      transition: var(--transition-smooth);
      animation: pulseGlow 2s infinite;
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--primary-blue);
      color: var(--primary-blue);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition-smooth);
    }
    .btn-secondary:hover {
      background: rgba(10,102,245,0.1);
    }
    @keyframes pulseGlow {
      0% { box-shadow: 0 0 15px rgba(10,102,245,0.5); }
      50% { box-shadow: 0 0 28px rgba(10,102,245,0.8); }
      100% { box-shadow: 0 0 15px rgba(10,102,245,0.5); }
    }
    .hero-image {
      width: 100%;
      border-radius: 20px;
      object-fit: cover;
      height: 400px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
    }
    .data-float {
      position: absolute;
      bottom: 20px;
      right: 20px;
      background: var(--card-glass);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 16px 20px;
      color: white;
      font-weight: 600;
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        padding: 100px 0 60px;
        gap: 40px;
      }
      .hero h1 {
        font-size: 2.8rem;
      }
      .hero-image {
        height: 280px;
      }
    }

    /* 亮点网格 */
    .features {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 40px;
    }
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--card-glass);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      transition: var(--transition-smooth);
    }
    .feature-card:hover {
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }
    .feature-card.large {
      grid-column: span 2;
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--primary-blue);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      color: white;
      font-size: 1.4rem;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .feature-grid {
        grid-template-columns: 1fr;
      }
      .feature-card.large {
        grid-column: span 1;
      }
    }

    /* 案例瀑布流 */
    .cases {
      padding: 80px 0;
    }
    .masonry {
      column-count: 3;
      column-gap: 20px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 20px;
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
      background: var(--secondary-bg);
    }
    .case-img {
      width: 100%;
      height: 220px;
      object-fit: cover;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      padding: 20px;
      color: white;
    }
    @media (max-width: 768px) {
      .masonry {
        column-count: 1;
      }
    }

    /* 方案对比 */
    .compare {
      padding: 80px 0;
    }
    .compare-table {
      display: flex;
      gap: 20px;
      overflow-x: auto;
    }
    .compare-col {
      flex: 1;
      background: var(--card-glass);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 24px;
      min-width: 240px;
    }
    .compare-col.featured {
      border-left: 4px solid var(--primary-blue);
      box-shadow: 0 0 18px rgba(10,102,245,0.15);
    }

    /* 数据带 */
    .stats-band {
      background: var(--secondary-bg);
      padding: 70px 0;
      text-align: center;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
    }
    .stat-item {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-blue);
      font-family: var(--font-mono);
    }

    /* FAQ */
    .faq {
      padding: 80px 0;
    }
    .faq-layout {
      display: flex;
      gap: 40px;
    }
    .faq-sidebar {
      flex: 1;
    }
    .faq-content {
      flex: 2;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-subtle);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 700;
      color: white;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .faq-layout {
        flex-direction: column;
      }
    }

    /* CTA */
    .cta-section {
      background: var(--bg-dark);
      padding: 80px 0;
    }
    .cta-grid {
      display: flex;
      gap: 40px;
    }
    .cta-form {
      background: var(--card-glass);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      padding: 32px;
      flex: 1;
    }
    .cta-form input, .cta-form textarea {
      width: 100%;
      background: #0D1117;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      padding: 12px;
      color: white;
      margin-bottom: 16px;
    }
    .btn-submit {
      background: var(--primary-blue);
      border: none;
      color: white;
      padding: 14px;
      width: 100%;
      border-radius: var(--radius-btn);
      font-weight: 700;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .cta-grid {
        flex-direction: column;
      }
    }

    /* 页脚 */
    .footer {
      background: #0D1117;
      border-top: 1px solid var(--border-subtle);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      color: var(--text-muted);
    }