/* roulang page: index */
:root {
      --primary-deep: #1E2D2F;
      --accent-copper: #C49A6C;
      --accent-copper-hover: #A87D4F;
      --bg-warm: #FAF7F2;
      --accent-cyan: #00B4D8;
      --text-body: #3A4142;
      --text-muted: #6B7172;
      --border-light: #E0E3E2;
      --card-bg: #FFFFFF;
      --shadow-sm: 0 2px 12px rgba(30, 45, 47, 0.06);
      --shadow-md: 0 6px 20px rgba(30, 45, 47, 0.10);
      --radius-card: 10px;
      --radius-btn: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-mono: "Inter", "SF Pro Display", "Helvetica Neue", sans-serif;
      --spacing-section: 80px;
    }

    * {
      box-sizing: border-box;
    }

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

    h1, h2, h3, h4 {
      font-family: var(--font-sans);
      color: var(--primary-deep);
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 42px;
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 1rem;
    }

    h2 {
      font-size: 30px;
      font-weight: 600;
      margin-bottom: 1rem;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }

    p {
      font-size: 16px;
      color: var(--text-body);
      line-height: 1.75;
      margin-bottom: 1.5rem;
    }

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

    a {
      color: var(--accent-copper);
      text-decoration: none;
      transition: color 0.2s ease, border-bottom 0.2s ease;
    }

    a:hover {
      color: var(--accent-cyan);
      border-bottom: 1px solid var(--accent-cyan);
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮重置 */
    .btn-primary-z {
      background-color: var(--accent-copper);
      border: none;
      color: #FFFFFF;
      font-weight: 500;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: background-color 0.25s ease, transform 0.15s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      letter-spacing: 0.3px;
      box-shadow: 0 2px 6px rgba(30,45,47,0.08);
    }
    .btn-primary-z:hover {
      background-color: var(--accent-copper-hover);
      color: #fff;
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(30,45,47,0.12);
    }
    .btn-outline-z {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      font-weight: 500;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      font-size: 16px;
    }
    .btn-outline-z:hover {
      background: rgba(30,45,47,0.05);
      border-color: var(--accent-copper);
      color: var(--accent-copper);
    }
    .btn-link-z {
      color: var(--accent-copper);
      font-weight: 500;
      padding: 0;
      border-bottom: 1px solid transparent;
      text-decoration: none;
    }
    .btn-link-z:hover {
      border-bottom: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
    }

    /* 导航 */
    .navbar-custom {
      background: rgba(250, 247, 242, 0.85);
      backdrop-filter: blur(12px);
      padding: 16px 0;
      border-bottom: 1px solid rgba(224,227,226,0.6);
      position: sticky;
      top: 0;
      z-index: 1020;
      transition: all 0.3s;
    }
    .navbar-brand {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 28px;
      letter-spacing: 1px;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
    }
    .navbar-brand span {
      color: var(--accent-copper);
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--primary-deep) !important;
      margin: 0 8px;
      padding: 6px 2px !important;
      position: relative;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-copper);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .nav-link:hover {
      color: var(--accent-copper) !important;
    }

    /* 底部Tab (移动) */
    .mobile-bottom-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: #FFFFFF;
      border-top: 1px solid var(--border-light);
      display: none;
      justify-content: space-around;
      align-items: center;
      z-index: 1030;
      padding: 0 12px;
      box-shadow: 0 -2px 10px rgba(0,0,0,0.03);
    }
    .mobile-tab {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--text-muted);
      transition: color 0.2s;
      text-decoration: none;
      font-weight: 500;
    }
    .mobile-tab i {
      font-size: 20px;
      margin-bottom: 2px;
    }
    .mobile-tab.active {
      color: var(--accent-copper);
    }

    @media (max-width: 768px) {
      .mobile-bottom-nav {
        display: flex;
      }
      body {
        padding-bottom: 80px;
      }
      h1 {
        font-size: 36px;
      }
      h2 {
        font-size: 26px;
      }
      .navbar-custom .d-flex.align-items-center {
        flex-wrap: wrap;
      }
      .navbar-custom .btn {
        padding: 8px 18px;
        font-size: 14px;
      }
    }

    /* 区块间距 */
    section {
      padding: var(--spacing-section) 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      height: 420px;
      position: relative;
      box-shadow: var(--shadow-md);
    }
    .floating-card {
      position: absolute;
      bottom: 24px;
      left: 20px;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      padding: 14px 20px;
      border-radius: 14px;
      box-shadow: var(--shadow-sm);
      font-weight: 600;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    /* 亮点网格非三列套路 */
    .feature-row {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      justify-content: center;
    }
    .feature-item {
      display: flex;
      align-items: flex-start;
      gap: 20px;
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      width: calc(50% - 15px);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
    }
    .feature-item:hover {
      border-color: var(--accent-copper);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      font-size: 34px;
      color: var(--accent-cyan);
    }

    /* 案例瀑布 */
    .masonry-grid {
      column-count: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      margin-bottom: 24px;
      overflow: hidden;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .case-content {
      padding: 20px;
    }
    .badge-z {
      background: var(--accent-copper);
      color: white;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 20px;
      font-weight: 500;
    }

    /* 对比面板 */
    .compare-panel {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .compare-left {
      background: #f0f2f1;
      border-radius: 14px;
      padding: 28px;
    }
    .compare-right {
      background: rgba(30,45,47,0.04);
      border: 1px solid var(--accent-copper);
      border-radius: 14px;
      padding: 28px;
    }
    .check-icon {
      color: var(--accent-cyan);
    }
    .cross-icon {
      color: #b0b5b5;
    }

    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--primary-deep);
      box-shadow: none;
      font-weight: 600;
    }
    .accordion-button {
      font-weight: 600;
      font-size: 16px;
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
    }

    /* 表单 */
    .form-control {
      border: 1px solid var(--border-light);
      border-radius: 8px;
      padding: 12px 16px;
      background: white;
    }
    .form-control:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 0 3px rgba(0,180,216,0.1);
    }

    footer {
      background: var(--primary-deep);
      color: #C5C9C8;
    }
    footer a {
      color: #C5C9C8;
    }
    footer a:hover {
      color: var(--accent-copper);
    }

    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .masonry-grid {
        column-count: 2;
      }
      .feature-item {
        width: 100%;
      }
    }
    @media (max-width: 576px) {
      .masonry-grid {
        column-count: 1;
      }
      .compare-panel {
        grid-template-columns: 1fr;
      }
    }