/* roulang page: index */
:root {
      --primary: #0B3B3C;
      --accent: #00B4B4;
      --accent-hover: #009A9A;
      --bg: #F7F9FA;
      --white: #FFFFFF;
      --text: #1e2b2c;
      --text-light: #5f6c6d;
      --border: #e0e5e6;
      --radius-lg: 16px;
      --radius-pill: 30px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 30px rgba(0,0,0,0.04);
      --shadow-hover: 0 16px 40px rgba(0,0,0,0.08);
      --spacing-section: 100px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      margin: 0;
      font-weight: 400;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      margin: 0;
    }

    h1 {
      font-size: 2.8rem;
      letter-spacing: -0.5px;
      font-weight: 700;
    }

    h2 {
      font-size: 2rem;
      margin-bottom: 0.5rem;
    }

    h3 {
      font-size: 1.25rem;
      font-weight: 600;
    }

    p, li {
      font-size: 1rem;
      font-weight: 400;
      color: var(--text-light);
    }

    .text-small {
      font-size: 0.85rem;
      font-weight: 500;
    }

    a {
      color: var(--accent);
      transition: color 0.2s;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--accent);
      color: white;
      border-radius: var(--radius-pill);
      padding: 12px 28px;
      font-weight: 600;
      border: none;
      display: inline-block;
      text-decoration: none;
      transition: background 0.25s, transform 0.2s;
      box-shadow: 0 4px 12px rgba(0,180,180,0.25);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
      color: white;
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      border-radius: var(--radius-pill);
      padding: 12px 28px;
      font-weight: 600;
      display: inline-block;
      text-decoration: none;
      transition: background 0.25s, color 0.25s;
    }

    .btn-secondary:hover {
      background: rgba(0,180,180,0.08);
      color: var(--accent-hover);
    }

    /* 卡片系统 */
    .card {
      background: var(--white);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      padding: 28px 24px;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      height: 100%;
    }

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

    /* 导航 - 卡片化面板 */
    .nav-panel {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      border-radius: 0 0 20px 20px;
      padding: 12px 24px;
      margin-top: 12px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
      justify-content: space-between;
      position: relative;
      z-index: 10;
    }

    .logo-area {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .logo-sub {
      font-size: 0.8rem;
      font-weight: 500;
      color: var(--text-light);
      letter-spacing: 1px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-item {
      padding: 8px 16px;
      border-radius: 8px;
      color: var(--text);
      font-weight: 500;
      transition: background 0.2s;
      text-decoration: none;
    }

    .nav-item:hover {
      background: rgba(0,180,180,0.1);
      color: var(--primary);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
      cursor: pointer;
    }

    /* 移动端导航 */
    @media (max-width: 640px) {
      .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 20px;
        right: 20px;
        background: white;
        border-radius: 20px;
        box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        padding: 20px;
      }
      .nav-menu.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(120deg, #0B3B3C 0%, #005F5F 100%);
      color: white;
      padding: 60px 0 80px;
      margin-top: 20px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-left {
      flex: 1;
    }

    .hero-right {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 320px;
      position: relative;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11,59,60,0.2), rgba(0,180,180,0.15));
    }

    .hero h1 {
      color: white;
      margin-bottom: 1rem;
    }

    .hero .subtitle {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2rem;
    }

    /* 亮点网格 */
    .advantage-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 1rem;
    }

    .metric-badge {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* 数据条 */
    .metrics-bar {
      background: #edf2f2;
      border-radius: 24px;
      padding: 32px 24px;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }

    /* 案例瀑布流 */
    .masonry {
      column-count: 2;
      column-gap: 24px;
    }

    .masonry .card {
      break-inside: avoid;
      margin-bottom: 24px;
    }

    .case-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 16px;
    }

    .tag {
      background: #eef3f3;
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
    }

    /* 方案对比 */
    .compare-card {
      border: 1px solid var(--border);
      background: white;
      border-radius: 20px;
      padding: 28px;
    }

    .compare-card.recommended {
      border: 2px solid var(--accent);
      box-shadow: 0 12px 28px rgba(0,180,180,0.1);
    }

    .badge-recommend {
      background: var(--accent);
      color: white;
      border-radius: 20px;
      padding: 4px 16px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* FAQ */
    .accordion-title {
      font-weight: 600;
      color: var(--primary);
      border-radius: 12px;
      padding: 16px;
      background: white;
      margin-bottom: 8px;
      cursor: pointer;
      transition: 0.2s;
    }

    .accordion-title:hover {
      color: var(--accent);
    }

    /* 联系 */
    .contact-info i {
      color: var(--accent);
      width: 24px;
    }

    input, textarea {
      border-radius: 8px;
      border: 1px solid var(--border);
      padding: 12px;
      width: 100%;
      margin-bottom: 16px;
      transition: border 0.2s;
    }

    input:focus, textarea:focus {
      border-color: var(--accent);
      outline: none;
    }

    footer {
      background: var(--primary);
      color: #ccc;
      padding: 40px 0 20px;
    }

    footer a {
      color: #ddd;
    }

    @media (max-width: 640px) {
      h1 { font-size: 2rem; }
      .hero-grid { flex-direction: column; }
      .masonry { column-count: 1; }
      .metrics-bar { flex-direction: column; gap: 24px; }
      .nav-panel { flex-wrap: wrap; }
    }