/* roulang page: index */
:root {
      --primary: #0B3B42;
      --primary-dark: #072E33;
      --accent: #E8751A;
      --accent-dark: #C95F0F;
      --signal-green: #00A896;
      --bg-warm: #F5F3EE;
      --card-bg: #FFFFFF;
      --border-light: #E0DDD6;
      --text-main: #1A1A1A;
      --text-muted: #4A4A4A;
      --text-light: #CCCCCC;
      --footer-bg: #0A2A2F;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --shadow-card: 0 2px 12px rgba(11, 59, 66, 0.06);
      --shadow-hover: 0 8px 24px rgba(11, 59, 66, 0.12);
      --border-radius-card: 12px;
      --border-radius-btn: 8px;
      --border-radius-container: 16px;
      --section-padding: 80px 0;
    }

    * {
      box-sizing: border-box;
    }

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

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

    h1 {
      font-size: 2.8rem;
      line-height: 1.25;
    }

    h2 {
      font-size: 2rem;
      font-weight: 600;
      letter-spacing: -0.2px;
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }

    .text-muted-custom {
      color: var(--text-muted) !important;
    }

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

    /* 导航栏自定义 */
    .navbar-custom {
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      padding: 0.6rem 0;
    }

    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary) !important;
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .navbar-brand i {
      font-size: 1.9rem;
      color: var(--accent);
    }

    .nav-chip {
      background: #EEECE6;
      color: var(--primary);
      border-radius: 30px;
      padding: 0.4rem 1.2rem;
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.2s ease;
      white-space: nowrap;
      margin: 0 3px;
    }
    .nav-chip:hover, .nav-chip.active {
      background: var(--primary);
      color: white;
      text-decoration: none;
    }
    .nav-item {
      list-style: none;
    }
    .navbar-nav {
      gap: 6px;
      align-items: center;
    }

    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--border-radius-btn);
      transition: 0.2s;
    }
    .btn-primary-custom:hover {
      background: var(--primary-dark);
      color: white;
    }

    .btn-accent {
      background: var(--accent);
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--border-radius-btn);
      box-shadow: 0 4px 12px rgba(232,117,26,0.25);
      transition: 0.2s;
    }
    .btn-accent:hover {
      background: var(--accent-dark);
      box-shadow: 0 0 18px rgba(232,117,26,0.4);
      color: white;
      transform: translateY(-1px);
    }

    .btn-outline-primary {
      border: 2px solid var(--primary);
      background: transparent;
      color: var(--primary);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--border-radius-btn);
    }
    .btn-outline-primary:hover {
      background: var(--primary);
      color: white;
    }

    section {
      padding: var(--section-padding);
    }

    .section-title {
      margin-bottom: 2.5rem;
      position: relative;
    }
    .section-title h2 {
      display: inline-block;
      border-bottom: 4px solid var(--accent);
      padding-bottom: 6px;
    }

    /* Hero 双栏 */
    .hero-left h1 {
      color: var(--primary);
    }
    .hero-image {
      border-radius: var(--border-radius-container);
      box-shadow: var(--shadow-hover);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 卡片 */
    .card-highlight {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--border-radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
      height: 100%;
    }
    .card-highlight:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
      transform: translateY(-3px);
    }
    .icon-circle {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 1rem;
    }

    /* 瀑布流 */
    .masonry-grid {
      column-count: 3;
      column-gap: 24px;
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
      background: white;
      border-radius: var(--border-radius-card);
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: 0.2s;
      box-shadow: var(--shadow-card);
    }
    .masonry-item:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
    }
    .masonry-item img {
      width: 100%;
      display: block;
    }
    .masonry-content {
      padding: 20px 18px;
    }

    /* 表格对比 */
    .table-compare {
      background: white;
      border-radius: var(--border-radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .table-compare thead {
      background: var(--primary);
      color: white;
    }
    .table-compare th, .table-compare td {
      padding: 16px;
      vertical-align: middle;
      border-bottom: 1px solid var(--border-light);
    }
    .highlight-col {
      background: rgba(232,117,26,0.06);
    }

    /* 案例数字 */
    .stat-number {
      font-size: 2.6rem;
      font-weight: 700;
      color: var(--signal-green);
      line-height: 1.2;
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--primary);
      box-shadow: none;
    }
    .accordion-button {
      background-color: var(--bg-warm);
      font-weight: 600;
      color: var(--text-main);
    }
    .accordion-button:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 2px rgba(232,117,26,0.2);
    }

    .cta-banner {
      background: var(--primary);
      border-radius: var(--border-radius-container);
      padding: 3rem;
    }

    footer {
      background: var(--footer-bg);
      color: var(--text-light);
    }
    footer a {
      color: var(--text-light);
      text-decoration: none;
    }
    footer a:hover {
      color: var(--accent);
    }
    .form-control-custom {
      border-radius: 6px;
      border: 1px solid var(--border-light);
      padding: 10px 14px;
    }

    @media (max-width: 992px) {
      .masonry-grid {
        column-count: 2;
      }
      h1 {
        font-size: 2.2rem;
      }
    }
    @media (max-width: 768px) {
      .masonry-grid {
        column-count: 1;
      }
      .navbar-collapse {
        background: white;
        padding: 1rem;
        border-radius: 12px;
        margin-top: 10px;
      }
      .hero-left, .hero-right {
        width: 100%;
      }
      section {
        padding: 60px 0;
      }
    }
    @media (max-width: 576px) {
      h1 {
        font-size: 1.9rem;
      }
      .nav-chip {
        padding: 0.3rem 0.8rem;
        font-size: 0.8rem;
      }
    }