/* roulang page: index */
:root {
      --primary: #5B7FA5;
      --primary-dark: #4A6A8A;
      --secondary: #C0C5CE;
      --accent: #D4A843;
      --accent-hover: #b8922f;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --text-main: #1E2A38;
      --text-secondary: #5F6B7A;
      --text-weak: #8E99A8;
      --border-light: #E5E9F0;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
      --font-number: "Inter", "SF Pro Text", system-ui, sans-serif;
      --transition: 0.2s ease;
    }

    * {
      box-sizing: border-box;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    .grid-container {
      max-width: 1200px;
    }

    /* 导航玻璃沉浸 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 99;
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
      transition: background 0.25s ease, box-shadow 0.25s ease;
    }

    .site-header.scrolled {
      background: var(--primary);
      border-bottom: none;
      box-shadow: 0 2px 12px rgba(0,0,0,0.1);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      padding: 0 1.5rem;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: var(--text-main);
      transition: color 0.25s;
      white-space: nowrap;
    }
    .logo i {
      color: var(--accent);
      margin-right: 6px;
      font-size: 1.6rem;
      vertical-align: middle;
    }
    .scrolled .logo {
      color: #fff;
    }
    .scrolled .logo i {
      color: #fff;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
      font-weight: 500;
    }
    .nav-links a {
      color: var(--text-main);
      transition: color 0.2s;
      font-size: 0.95rem;
      padding: 0.25rem 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
    .scrolled .nav-links a {
      color: #fff;
    }
    .scrolled .nav-links a:hover {
      color: #FFE9B0;
      border-bottom-color: #FFE9B0;
    }

    .btn-cta-nav {
      background: var(--accent);
      color: #fff !important;
      padding: 0.5rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      margin-left: 0.5rem;
      transition: background 0.2s;
      white-space: nowrap;
    }
    .btn-cta-nav:hover {
      background: var(--accent-hover);
      color: #fff !important;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-main);
      cursor: pointer;
    }
    .scrolled .menu-toggle {
      color: #fff;
    }

    @media (max-width: 840px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: #fff;
        box-shadow: 0 8px 20px rgba(0,0,0,0.08);
        padding: 1.5rem;
        gap: 1.2rem;
        border-top: 1px solid var(--border-light);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .scrolled .nav-links {
        background: var(--primary);
      }
    }

    /* 板块通用 */
    section {
      padding: 70px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 2.5rem;
    }
    .section-title h2 {
      font-size: 2rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 0.5rem;
    }
    .section-title p {
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto;
    }

    /* Hero */
    #hero {
      padding-top: 140px;
      padding-bottom: 70px;
      background-color: var(--bg);
      background-image: radial-gradient(circle at 20% 30%, rgba(91,127,165,0.03) 0%, transparent 40%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1rem;
    }
    .hero-text .sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: #fff;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      border: none;
      cursor: pointer;
      transition: background 0.2s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      color: #fff;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #fff;
    }
    .hero-image {
      flex: 1;
      text-align: right;
    }
    .hero-image img {
      border-radius: 20px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.06);
      max-height: 380px;
      object-fit: cover;
    }

    /* 亮点卡片 */
    .highlights-grid {
      display: flex;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .highlight-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      flex: 1 1 250px;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .icon-place {
      width: 64px;
      height: 64px;
      background: #EDF1F7;
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.2rem;
      color: var(--primary);
      font-size: 2rem;
    }
    .highlight-card h3 {
      font-size: 1.4rem;
      margin-bottom: 0.5rem;
    }

    /* 案例瀑布流 */
    .cases-masonry {
      columns: 2;
      column-gap: 1.8rem;
    }
    .case-card {
      break-inside: avoid;
      background: #fff;
      border-radius: var(--radius-card);
      margin-bottom: 1.8rem;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-md);
    }
    .case-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
      border-radius: 12px 12px 0 0;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img {
      transform: scale(1.02);
    }
    .case-content {
      padding: 1.2rem 1.5rem;
    }
    .tag {
      background: var(--secondary);
      color: #1E2A38;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 500;
      display: inline-block;
      margin-bottom: 0.5rem;
    }

    /* 方案对比 */
    .solutions-row {
      display: flex;
      gap: 1.5rem;
      flex-wrap: wrap;
      justify-content: center;
    }
    .plan-card {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      flex: 1 1 280px;
      display: flex;
      flex-direction: column;
    }
    .plan-card.featured {
      border-left: 5px solid var(--accent);
      background: #F7F9FC;
      box-shadow: var(--shadow-sm);
    }
    .plan-price {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary);
    }
    .feature-list {
      list-style: none;
      margin: 1.5rem 0;
      padding: 0;
    }
    .feature-list li {
      margin-bottom: 0.5rem;
      color: var(--text-secondary);
    }

    /* FAQ */
    .accordion {
      background: #fff;
      border-radius: var(--radius-card);
    }
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      font-weight: 600;
      color: var(--text-main);
    }

    /* 联系 */
    .contact-cta {
      text-align: center;
      background: #fff;
      border-radius: 24px;
      padding: 3rem;
      margin-bottom: 2rem;
    }
    .footer {
      background: #1E2A38;
      color: #C0C5CE;
      padding: 3rem 0 1.5rem;
    }
    .footer a {
      color: #C0C5CE;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .cases-masonry {
        columns: 1;
      }
    }