/* roulang page: index */
:root {
      --primary: #4E6EF2;
      --primary-hover: #3A5CE5;
      --primary-light: #EEF1FE;
      --green: #00B578;
      --orange: #FF9F0A;
      --red: #FA5151;
      --bg: #F5F6FA;
      --card-white: #FFFFFF;
      --text-black: #1F2329;
      --text-gray: #86909C;
      --border-light: #E5E8EF;
      --footer-bg: #1F2329;
      --footer-text: #B0B8C1;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 6px 24px rgba(0,0,0,0.10);
      --transition: 200ms ease;
      --max-width: 1200px;
      --header-height: 60px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text-black);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
      height: auto;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    h1, h2, h3 {
      font-weight: 600;
    }
    h1 {
      font-size: 40px;
      line-height: 1.2;
      font-weight: 700;
    }
    h2 {
      font-size: 32px;
      line-height: 1.3;
    }
    h3 {
      font-size: 20px;
      line-height: 1.4;
    }
    .section-padding {
      padding: 80px 0;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-black);
      transition: color var(--transition);
      white-space: nowrap;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      transition: background var(--transition), box-shadow var(--transition);
      display: inline-block;
      white-space: nowrap;
      box-shadow: 0 2px 8px rgba(78,110,242,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 14px rgba(58,92,229,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-black);
      transition: var(--transition);
      display: block;
    }
    /* Hero */
    .hero {
      padding-top: calc(var(--header-height) + 60px);
      padding-bottom: 80px;
      background: linear-gradient(135deg, #4E6EF2 0%, #7B8FF7 100%);
      position: relative;
      color: white;
      overflow: hidden;
    }
    .hero::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 60px;
      background: var(--bg);
      clip-path: ellipse(70% 100% at 50% 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      position: relative;
      z-index: 2;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: flex-end;
    }
    .hero h1 {
      margin-bottom: 20px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.15);
      color: white;
    }
    .hero-sub {
      font-size: 16px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .data-badge-group {
      display: flex;
      flex-direction: column;
      gap: 20px;
      align-items: flex-end;
    }
    .data-float-card {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      padding: 18px 24px;
      color: white;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      min-width: 140px;
    }
    .data-float-card .number {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.1;
      color: white;
    }
    .data-float-card .label {
      font-size: 12px;
      opacity: 0.8;
    }
    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .adv-card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      transition: box-shadow var(--transition);
    }
    .adv-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .adv-large {
      background: linear-gradient(135deg, #ffffff 0%, #EEF1FE 100%);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    .icon-circle i {
      font-size: 24px;
      color: var(--primary);
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: box-shadow var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
    }
    .service-link {
      margin-top: 16px;
      color: var(--primary);
      font-weight: 500;
      font-size: 14px;
      transition: text-decoration var(--transition);
    }
    .service-link:hover {
      text-decoration: underline;
    }
    /* 案例对比 */
    .case-section {
      background: #F5F6FA;
    }
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .compare-table {
      background: white;
      border-radius: var(--radius-lg);
      padding: 24px;
    }
    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
    }
    .testimonial-cards {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .testimonial {
      background: white;
      border-radius: var(--radius-lg);
      padding: 20px;
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .avatar {
      width: 48px;
      height: 48px;
      background: #E5E8EF;
      border-radius: 50%;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
      overflow: hidden;
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: white;
    }
    .faq-answer {
      padding: 0 20px 16px;
      color: var(--text-gray);
      font-size: 14px;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #4E6EF2 0%, #7B8FF7 100%);
      color: white;
    }
    .cta-form {
      display: flex;
      gap: 12px;
      max-width: 500px;
      margin: 24px auto 0;
    }
    .cta-input {
      flex: 1;
      padding: 12px 16px;
      border-radius: var(--radius-md);
      border: none;
      background: white;
    }
    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 24px;
      margin-top: 20px;
      opacity: 0.8;
    }
    /* Footer */
    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: 1fr 1fr; }
      .services-grid { grid-template-columns: 1fr 1fr; }
      .case-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 24px; }
      .section-padding { padding: 60px 0; }
      .hero-grid { flex-direction: column; }
      .hero-right { justify-content: center; }
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .advantages-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .cta-form { flex-direction: column; }
    }