/* roulang page: index */
:root {
      --primary: #1E4A6B;
      --primary-light: #2a5f84;
      --accent: #F18F01;
      --accent-hover: #d17b00;
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --bg-lightblue: #E6F0F8;
      --text-main: #0F172A;
      --text-secondary: #475569;
      --text-link: #1E4A6B;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 12px 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;
      --radius-lg: 16px;
      --font-stack: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

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

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

    a {
      color: var(--text-link);
      text-decoration: none;
      transition: color 0.2s;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.25s ease;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      height: 64px;
    }

    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }

    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .logo i {
      color: var(--accent);
      font-size: 1.8rem;
    }
    .logo:hover {
      color: var(--primary-light);
      text-decoration: none;
    }

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

    .nav-menu a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 4px 0;
      border-bottom: 3px solid transparent;
      transition: 0.2s;
      white-space: nowrap;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
      text-decoration: none;
    }

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

    .mobile-drawer {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: white;
      transform: translateX(100%);
      transition: transform 0.3s ease;
      z-index: 100;
      display: flex;
      flex-direction: column;
      padding: 24px;
    }

    .mobile-drawer.open {
      transform: translateX(0);
    }

    .drawer-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 32px;
    }

    .drawer-nav {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .drawer-nav a {
      font-size: 1.2rem;
      font-weight: 500;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
      color: var(--text-main);
      display: block;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      display: inline-block;
      border: none;
      box-shadow: var(--shadow-sm);
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--accent);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
      text-decoration: none;
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      display: inline-block;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
      text-decoration: none;
    }

    .btn-link {
      background: none;
      border: none;
      color: var(--primary);
      font-weight: 500;
      text-decoration: underline;
      padding: 8px 0;
    }
    .btn-link:hover {
      color: var(--accent);
      text-decoration: none;
    }

    .btn-lg {
      padding: 16px 40px;
      font-size: 1.1rem;
    }

    /* Hero */
    .hero {
      padding: 80px 0;
      background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-text {
      flex: 1;
    }
    .hero h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      color: var(--text-main);
    }
    .hero .subtitle {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }
    .hero .pain-desc {
      color: #475569;
      margin-bottom: 28px;
      font-size: 1rem;
      border-left: 4px solid var(--accent);
      padding-left: 16px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    /* 通用区块 */
    section {
      padding: 72px 0;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-subtitle {
      text-align: center;
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto 48px;
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--bg-card);
      padding: 28px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: 0.2s;
    }
    .pain-card i {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 16px;
    }
    .pain-card h3 {
      font-size: 1.25rem;
      margin-bottom: 8px;
    }

    /* 优势卡片 */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: 0.25s;
      display: flex;
      flex-direction: column;
    }
    .adv-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .adv-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .adv-card-body {
      padding: 20px;
    }

    /* 服务体系 左右交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 0 0 40%;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .service-text {
      flex: 1;
    }

    /* 数据仪表盘 */
    .results-bar {
      background: var(--bg-lightblue);
      border-radius: var(--radius-lg);
      padding: 48px 32px;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }
    .stat-item .number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
    }
    .stat-item .unit {
      font-size: 1.2rem;
      color: var(--accent);
      margin-left: 4px;
    }

    /* 证言 */
    .test-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #FAFBFC;
      border-radius: var(--radius-card);
      padding: 24px;
      border-bottom: 3px solid var(--border-light);
      text-align: left;
    }
    .testimonial-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }
    .testimonial-header img {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      object-fit: cover;
    }

    /* FAQ */
    .faq-item {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn);
      margin-bottom: 12px;
      background: white;
    }
    .faq-question {
      padding: 16px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      padding: 0 16px 16px;
      display: none;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open {
      background: #F0F6FC;
    }

    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #E6F0F8 0%, #FFFFFF 100%);
      padding: 64px 0;
      text-align: center;
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      padding: 48px 0;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-light);
      padding: 16px 0;
      text-align: center;
      color: var(--text-secondary);
      font-size: 0.9rem;
    }

    @media (max-width: 1024px) {
      .adv-grid { grid-template-columns: repeat(2, 1fr); }
      .test-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .hero-grid { flex-direction: column; }
      .pain-grid { grid-template-columns: 1fr; }
      .adv-grid { grid-template-columns: 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .test-grid { grid-template-columns: 1fr; }
      .results-bar { flex-direction: column; gap: 24px; }
    }