/* roulang page: index */
:root {
      --primary-green: #0FA954;
      --accent-orange: #F5A623;
      --bg: #F7F8FC;
      --card-bg: #FFFFFF;
      --text: #1A1A1A;
      --text-secondary: #6B7280;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(15,169,84,0.08);
      --transition: 250ms ease-out;
      --container: 1200px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    /* 导航 Header */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      background: transparent;
      transition: background 300ms ease, box-shadow 300ms ease;
    }

    .header.scrolled {
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }

    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text);
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 18px;
    }

    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }

    .nav-menu a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary-green);
    }

    .nav-menu a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-green);
      border-radius: 2px;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text);
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(12px);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 28px;
      z-index: 999;
      font-size: 20px;
    }
    .mobile-menu a {
      font-weight: 600;
      color: var(--text);
    }

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
    }
    .hero-image-card {
      background: var(--card-bg);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(15,169,84,0.08);
      transition: transform 0.3s ease;
    }
    .hero-image-card img {
      width: 100%;
      height: auto;
      display: block;
    }
    .hero-title {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: var(--text);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .cta-group {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-green);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: background 0.2s, transform 0.1s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #0d9447;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-green);
      color: var(--primary-green);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: background 0.2s;
    }
    .btn-outline:hover {
      background: #E8F5EE;
    }
    .stats-row {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary-green);
      line-height: 1.2;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-secondary);
      margin-top: 4px;
    }

    /* 通用区块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 48px;
      color: var(--text);
    }

    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .adv-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 16px;
      color: var(--primary-green);
    }
    .adv-title {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .adv-desc {
      color: var(--text-secondary);
      font-size: 15px;
    }

    /* 服务方案 杂志分栏 */
    .service-panel {
      display: flex;
      gap: 40px;
      align-items: flex-start;
    }
    .service-tabs {
      flex: 0 0 30%;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .tab-item {
      padding: 14px 20px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-weight: 500;
      color: var(--text-secondary);
      transition: 0.2s;
      border-left: 3px solid transparent;
    }
    .tab-item.active {
      background: #E8F5EE;
      color: var(--primary-green);
      border-left-color: var(--primary-green);
      font-weight: 600;
    }
    .service-detail {
      flex: 1;
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .service-card-title {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-card-desc {
      color: var(--text-secondary);
      margin-bottom: 16px;
    }
    .text-link {
      color: var(--primary-green);
      font-weight: 500;
    }

    /* 数据案例 瀑布流 */
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      margin-bottom: 24px;
      break-inside: avoid;
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-info {
      padding: 20px;
    }
    .case-title {
      font-weight: 600;
      margin-bottom: 8px;
    }
    .case-stat {
      color: var(--accent-orange);
      font-weight: 700;
    }

    /* 对比表 */
    .comparison-table {
      display: grid;
      grid-template-columns: 1fr 1fr;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .comp-col {
      padding: 24px;
    }
    .comp-left {
      background: #f9fafb;
    }
    .comp-right {
      background: #E8F5EE;
    }
    .comp-header {
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 20px;
    }
    .comp-row {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
    }
    .faq-question {
      padding: 20px;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      font-weight: 500;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F9FAFB;
      padding: 0 20px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px 20px;
    }

    /* CTA */
    .cta-banner {
      background: linear-gradient(135deg, #0FA954 0%, #F5A623 100%);
      text-align: center;
      padding: 80px 0;
      color: white;
      border-radius: 0;
    }
    .cta-banner h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    .btn-white {
      background: white;
      color: var(--primary-green);
      padding: 14px 40px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      display: inline-block;
      margin-top: 24px;
    }

    /* Footer */
    .footer {
      background: #1A1A1A;
      color: #9CA3AF;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      color: white;
      font-weight: 700;
      font-size: 20px;
    }
    .copyright {
      border-top: 1px solid #222;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
    }

    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .cases-masonry { columns: 2; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-title { font-size: 32px; }
      .advantages-grid { grid-template-columns: 1fr; }
      .service-panel { flex-direction: column; }
      .service-tabs { flex-direction: row; flex-wrap: wrap; }
      .cases-masonry { columns: 1; }
      .comparison-table { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }