/* roulang page: index */
:root {
      --primary-deep: #1E2D2F;
      --accent-gold: #C8A96E;
      --accent-gold-hover: #B8944F;
      --bg-warm: #F7F5F0;
      --bg-card: #FDFCF9;
      --border-subtle: #E8E5DF;
      --text-primary: #1A1A1A;
      --text-body: #2C2C2C;
      --text-muted: #6b6b6b;
      --copper-green: #7A9A8B;
      --copper-green-hover: #5f7d6e;
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', serif;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-data: 'Inter', 'Roboto', sans-serif;
      --radius-sm: 6px;
      --radius-md: 8px;
      --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
      --shadow-card-hover: 0 6px 20px rgba(0, 0, 0, 0.07);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, .serif-title {
      font-family: var(--font-serif);
      color: var(--text-primary);
      font-weight: 600;
      letter-spacing: 0.3px;
    }

    h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
    }

    h2 {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
      color: #1A1A1A;
    }

    .section-subtitle {
      font-family: var(--font-sans);
      color: var(--text-muted);
      font-size: 1rem;
      letter-spacing: 0.2px;
    }

    .text-gold {
      color: var(--accent-gold);
    }

    .bg-primary-deep {
      background-color: var(--primary-deep);
    }

    .btn-gold {
      background-color: var(--accent-gold);
      border: none;
      color: white;
      font-weight: 500;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-sm);
      transition: background-color 0.25s ease, transform 0.15s;
      font-family: var(--font-sans);
      letter-spacing: 0.3px;
    }

    .btn-gold:hover, .btn-gold:focus {
      background-color: var(--accent-gold-hover);
      color: white;
      outline: none;
      box-shadow: 0 4px 10px rgba(200,169,110,0.3);
    }

    .btn-outline-copper {
      background: transparent;
      border: 1.5px solid var(--copper-green);
      color: var(--copper-green);
      font-weight: 500;
      padding: 0.65rem 1.7rem;
      border-radius: var(--radius-sm);
      transition: all 0.25s;
      font-family: var(--font-sans);
    }

    .btn-outline-copper:hover {
      background-color: var(--copper-green);
      color: white;
      border-color: var(--copper-green);
    }

    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航 */
    .navbar {
      background-color: transparent;
      transition: background-color 0.3s, box-shadow 0.3s;
      padding: 0.8rem 0;
      z-index: 1000;
    }

    .navbar.scrolled {
      background-color: rgba(247, 245, 240, 0.96);
      backdrop-filter: blur(6px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }

    .navbar-brand {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo-icon {
      color: var(--accent-gold);
      font-size: 1.8rem;
    }

    .nav-link {
      font-size: 0.95rem;
      color: #2C2C2C !important;
      margin: 0 0.4rem;
      font-weight: 500;
      transition: color 0.2s;
      letter-spacing: 0.3px;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--copper-green) !important;
      text-decoration: underline;
      text-underline-offset: 6px;
    }

    .lang-badge {
      font-size: 0.8rem;
      border: 1px solid #ccc;
      padding: 2px 8px;
      border-radius: 20px;
      color: #4a4a4a;
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(90deg, rgba(247,245,240,0.9) 0%, rgba(247,245,240,0.7) 70%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      padding-top: 5rem;
    }

    /* 数据看板卡片 */
    .dashboard-card {
      background: var(--bg-card);
      border: none;
      border-bottom: 3px solid var(--accent-gold);
      border-radius: var(--radius-md);
      padding: 1.8rem 1.2rem;
      box-shadow: var(--shadow-card);
      transition: 0.2s;
    }

    .data-number {
      font-family: var(--font-data);
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--accent-gold);
    }

    /* 服务卡片 */
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }

    .service-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-3px);
    }

    .service-icon {
      font-size: 2.4rem;
      color: var(--copper-green);
      margin-bottom: 1rem;
    }

    /* 对比卡片 */
    .compare-card {
      background: #f2efe8;
      border-radius: var(--radius-md);
      padding: 2rem;
    }

    .compare-card.u8 {
      background: var(--bg-card);
      border-left: 5px solid var(--accent-gold);
      box-shadow: var(--shadow-card);
    }

    /* FAQ */
    .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      background: transparent;
      color: var(--text-primary);
      border-bottom: 1px solid var(--border-subtle);
      padding: 1.2rem 0;
    }

    .accordion-button:not(.collapsed) {
      color: var(--copper-green);
      background: transparent;
      box-shadow: none;
      border-left: 4px solid var(--accent-gold);
      padding-left: 1rem;
    }

    .accordion-body {
      font-size: 1rem;
      color: #3a3a3a;
    }

    /* 表单 */
    .form-control {
      border: 1px solid #D9D5CD;
      border-radius: var(--radius-sm);
      background: white;
      padding: 0.8rem 1rem;
    }

    .form-control:focus {
      border-color: var(--accent-gold);
      box-shadow: 0 0 0 0.2rem rgba(200,169,110,0.2);
    }

    footer a {
      color: #C5C0B5;
      text-decoration: none;
    }

    footer a:hover {
      color: var(--accent-gold);
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .navbar-collapse { background: rgba(247,245,240,0.98); padding: 1rem; border-radius: 8px; }
    }