/* roulang page: index */
/* 全局设计变量与重置 */
    :root {
      --primary: #2B4C3B;
      --primary-soft: #E8EDE6;
      --primary-light: rgba(43,76,59,0.08);
      --accent: #C87E1E;
      --accent-gold: #E8A838;
      --accent-gradient: linear-gradient(135deg, #E8A838, #D4952A);
      --bg-cream: #F5F2EB;
      --bg-faq: #FAF8F5;
      --card-bg: #FFFFFF;
      --text-dark: #1E2B22;
      --text-muted: #5A6A5D;
      --border-sub: #E0D9CC;
      --shadow-card: 0 4px 20px rgba(43,76,59,0.06);
      --shadow-hover: 0 8px 30px rgba(43,76,59,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-nav: 40px;
      --font-sans: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-mono: 'Inter', 'Noto Sans SC', sans-serif;
      --transition-base: all 0.2s ease;
      --transition-card: transform 0.25s ease, box-shadow 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-cream);
      color: var(--text-dark);
      line-height: 1.5;
      font-weight: 400;
      font-size: 16px;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
      width: 100%;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 48px;
      line-height: 1.15;
      margin-bottom: 1.25rem;
      font-weight: 700;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 1rem;
      color: var(--primary);
    }

    h3 {
      font-size: 24px;
      line-height: 1.35;
      font-weight: 500;
      margin-bottom: 0.75rem;
      color: var(--text-dark);
    }

    p {
      font-size: 16px;
      line-height: 1.7;
      margin-bottom: 1rem;
      color: var(--text-muted);
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }

    img {
      max-width: 100%;
      display: block;
      object-fit: cover;
    }

    button, .btn {
      font-family: var(--font-sans);
      cursor: pointer;
      border: none;
      background: none;
      font-weight: 500;
    }

    input, select, textarea {
      font-family: var(--font-sans);
    }

    /* 导航栏 - 白底平台 */
    #main-nav {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(l);
      height: 72px;
      border-bottom: 1px solid rgba(43,76,59,0.08);
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
      display: flex;
      align-items: center;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.75rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }

    .logo i {
      font-size: 2.1rem;
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 40px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      font-size: 1rem;
      padding-bottom: 6px;
      border-bottom: 3px solid transparent;
      transition: border-color 0.2s, color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom: 3px solid var(--accent-gold);
    }

    .mobile-trigger {
      display: none;
      font-size: 1.8rem;
      background: none;
    }

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

    /* 板块通用间距 */
    section {
      padding: 90px 0;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      h2 { font-size: 30px; }
    }

    @media (max-width: 768px) {
      .container { padding: 0 20px; }
      h1 { font-size: 34px; }
      h2 { font-size: 28px; }
      section { padding: 60px 0; }
      .nav-links { display: none; }

      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 16px;
        left: 16px;
        right: 16px;
        background: white;
        border-radius: 40px;
        padding: 10px 20px;
        box-shadow: 0 4px 20px rgba(0,0,0,0.1);
        z-index: 80;
        justify-content: space-around;
        align-items: center;
        border: 1px solid var(--border-sub);
      }
      .mobile-bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        color: var(--text-muted);
        gap: 4px;
      }
      .mobile-bottom-nav i { font-size: 1.2rem; }
    }

    /* 首屏 Hero */
    #hero {
      background: linear-gradient(135deg, #F5F2EB 0%, #E8EDE6 100%);
      display: flex;
      align-items: center;
      overflow: hidden;
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }

    .hero-text {
      max-width: 500px;
    }

    .hero-btn {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      background: var(--accent-gradient);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1.1rem;
      box-shadow: 0 8px 18px rgba(200,126,30,0.25);
      margin-top: 8px;
      transition: var(--transition-base);
    }
    .hero-btn:hover { filter: brightness(1.08); transform: translateY(-2px); }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      background-color: rgba(43,76,59,0.15);
      border-radius: 20px;
      height: 420px;
      box-shadow: 0 5px 25px rgba(0,0,0,0.1);
    }

    /* 数据看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: white;
      border-radius: 16px;
      padding: 32px 20px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: var(--transition-card);
    }
    .stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 44px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    .stat-label { font-size: 14px; color: var(--text-muted); }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-card);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
    .card-accent-left { border-left: 4px solid var(--accent-gold); }
    .card-circle-icon { background: var(--primary-light); border-radius: 50%; width: 60px; height: 60px; display: flex; align-items: center; justify-content: center; margin-bottom: 20px; }
    .card-img { width: 100%; height: 140px; border-radius: 8px; object-fit: cover; margin-bottom: 20px; }
    
    /* 对比区 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      align-items: center;
      gap: 20px;
    }
    .compare-card {
      padding: 32px;
      border-radius: 16px;
    }
    .bg-before { background: #F0EDE6; }
    .bg-after { background: #E8EDE6; }
    .compare-val { font-family: var(--font-mono); font-size: 36px; font-weight: 700; }

    /* FAQ */
    .faq-list { max-width: 800px; margin: 0 auto; }
    .faq-item {
      background: white;
      border-radius: 12px;
      padding: 18px 28px;
      margin-bottom: 16px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      display: flex;
      align-items: flex-start;
      gap: 20px;
      cursor: pointer;
    }
    .faq-number {
      background: var(--accent);
      color: white;
      border-radius: 50%;
      width: 30px; height: 30px;
      display: flex; align-items: center; justify-content: center;
      font-weight: 700; font-size: 14px; flex-shrink: 0; margin-top: 4px;
    }

    /* 表单区 */
    #contact {
      background: var(--primary);
      color: white;
    }
    .contact-grid {
      display: grid;
      grid-template-columns: 7fr 5fr;
      gap: 48px;
&:align-items: center;
    }
    .form-card {
      background: white;
      border-radius: 16px;
      padding: 40px;
      color: var(--text-dark);
    }
    .input-field {
      width: 100%; padding: 14px 16px; border: 1px solid var(--border-sub);
      border-radius: 8px; margin-bottom: 20px; font-size: 1rem;
    }
    .input-field:focus { outline: none; border-color: var(--primary); }
    .submit-btn {
      background: var(--accent-gradient); color: white; font-weight: 700;
      padding: 14px; width: 100%; border-radius: 8px; font-size: 1.1rem;
    }

    /* 页脚 */
    #footer {
      background: #1E2B22; color: #B8C4BB; padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px;
    }

    @media (max-width: 992px) {
      .hero-grid { grid-template-columns: 1fr; }
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: 1fr 1fr; }
      .comparison-wrapper { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 640px) {
      .dashboard-grid, .services-grid { grid-template-columns: 1fr; }
    }