/* roulang page: index */
:root {
      --primary: #0B2B26;
      --secondary: #E85D04;
      --bg-warm: #F5F3EE;
      --dark-bg: #1A1A1A;
      --text-main: #1E1E1E;
      --text-muted: #5A5A5A;
      --border-light: #E0DCD5;
      --white: #FFFFFF;
      --radius-card: 12px;
      --radius-btn: 6px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
      --spacing-section: 80px;
      --max-width: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    a:hover {
      color: var(--secondary);
    }

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

    button, .button {
      font-family: inherit;
    }

    .grid-container {
      max-width: var(--max-width);
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏 Mega Menu */
    .top-bar {
      background: var(--white);
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      padding: 0.75rem 0;
      position: sticky;
      top: 0;
      z-index: 100;
    }

    .top-bar .menu {
      background: transparent;
    }

    .top-bar .menu a {
      color: var(--text-main);
      font-weight: 500;
      padding: 0.75rem 1rem;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
    }

    .menu .active > a {
      color: var(--secondary);
      font-weight: 600;
    }

    .brand-logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      margin-right: 2rem;
    }

    .mega-trigger {
      background: transparent;
      border: none;
      color: var(--primary);
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 0.95rem;
      padding: 0.75rem 1rem;
      border-radius: var(--radius-btn);
      transition: background 0.2s;
    }

    .mega-trigger:hover {
      background: #f0f0f0;
    }

    .mega-trigger i {
      transition: transform 0.2s ease;
    }

    .mega-panel {
      position: absolute;
      right: 1.5rem;
      top: 100%;
      background: var(--white);
      border-radius: 8px;
      box-shadow: 0 12px 28px rgba(0,0,0,0.08);
      padding: 1.8rem;
      display: none;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      width: 560px;
      z-index: 200;
    }

    .mega-panel.active {
      display: grid;
    }

    .mega-left h4, .mega-right h4 {
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: var(--text-muted);
      margin-bottom: 1rem;
    }

    .service-item {
      display: flex;
      align-items: flex-start;
      gap: 0.8rem;
      margin-bottom: 1.2rem;
    }

    .service-item i {
      color: var(--secondary);
      font-size: 1.4rem;
    }

    .news-card {
      display: flex;
      gap: 0.8rem;
      margin-bottom: 1rem;
    }

    .news-card img {
      width: 60px;
      height: 60px;
      object-fit: cover;
      border-radius: 6px;
    }

    .date {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .mega-panel {
        width: 90%;
        right: 5%;
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 640px) {
      .top-bar .menu {
        flex-direction: column;
      }
      .mega-trigger {
        display: none;
      }
    }

    /* Hero双栏 */
    .hero-section {
      background: var(--white);
      padding: 3rem 0 4rem;
    }

    .hero-left h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--primary);
    }

    .hero-right img {
      border-radius: 18px;
      box-shadow: var(--shadow-sm);
    }

    .data-badge {
      background: rgba(0,0,0,0.65);
      backdrop-filter: blur(10px);
      color: white;
      border-radius: 10px;
      padding: 0.8rem 1.2rem;
      position: absolute;
      bottom: 20px;
      left: 20px;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      border: none;
      transition: background 0.2s;
    }

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

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: 0.2s;
    }

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

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--primary);
    }

    .accent-line {
      width: 60px;
      height: 4px;
      background: var(--secondary);
      margin-bottom: 2rem;
    }

    /* 卡片 */
    .card-modern {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 1.8rem;
      transition: all 0.25s;
    }

    .card-modern:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .footer-dark {
      background: var(--dark-bg);
      color: #ccc;
      padding: 3rem 0 2rem;
    }

    .footer-dark a {
      color: #aaa;
    }

    .footer-dark a:hover {
      color: var(--secondary);
    }

    /* 响应式微调 */
    @media (max-width: 640px) {
      .hero-left h1 {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.8rem;
      }
    }