/* roulang page: index */
:root {
      --primary: #FF6B4A;
      --primary-dark: #E55A3B;
      --secondary: #2A3A4A;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --bg: #FDF8F5;
      --card-bg: #FFFFFF;
      --text-primary: #2A3A4A;
      --text-secondary: #86909C;
      --border-light: #F0EDEA;
      --shadow-card: 0px 4px 20px rgba(255, 107, 74, 0.08);
      --shadow-hover: 0px 12px 32px rgba(255, 107, 74, 0.15);
      --radius-card: 16px;
      --radius-button: 12px;
      --radius-badge: 20px;
      --transition-base: all 0.25s cubic-bezier(0.2, 0.9, 0.4, 1);
    }
    * {
      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-primary);
      line-height: 1.6;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      background: none;
    }
    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: #fff;
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      box-sizing: border-box;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-primary);
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--text-primary);
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: var(--bg);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      z-index: 999;
    }
    .mobile-menu a {
      font-size: 20px;
      font-weight: 500;
      color: var(--text-primary);
    }
    /* Hero */
    #hero {
      padding: 120px 0 80px;
      background: linear-gradient(135deg, #FF6B4A 0%, #FF8E6B 100%);
      color: #fff;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .badge {
      display: inline-block;
      background: rgba(255,255,255,0.2);
      backdrop-filter: blur(8px);
      padding: 6px 18px;
      border-radius: var(--radius-badge);
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 24px;
      color: #fff;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero h2 {
      font-size: 20px;
      font-weight: 400;
      opacity: 0.9;
      margin-bottom: 32px;
      line-height: 1.5;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: #fff;
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition-base);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .btn-primary:hover {
      background: rgba(255,255,255,0.9);
      transform: scale(1.02);
    }
    .btn-secondary {
      background: rgba(255,255,255,0.15);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 16px;
      backdrop-filter: blur(4px);
      transition: var(--transition-base);
    }
    .btn-secondary:hover {
      background: rgba(255,255,255,0.25);
    }
    .hero-dashboard-img {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(12px);
      border-radius: 24px;
      padding: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    }
    /* 通用板块 */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .section-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .data-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
    }
    .progress-ring {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: conic-gradient(var(--primary) 0deg 260deg, #eee 260deg 360deg);
      margin-bottom: 12px;
    }
    .arrow-up {
      color: var(--success);
      font-weight: 700;
    }
    /* 服务矩阵 */
    .service-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 20px;
    }
    .link-more {
      color: var(--primary);
      font-weight: 500;
      display: inline-block;
      margin-top: 12px;
      transition: transform 0.2s;
    }
    .link-more:hover {
      transform: translateX(4px);
    }
    /* 对比 */
    .vs-badge {
      background: var(--primary);
      color: #fff;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #FF6B4A, #FF8E6B);
      color: #fff;
      text-align: center;
      border-radius: 32px;
      padding: 70px 40px;
    }
    .cta-block h2 {
      font-size: 36px;
    }
    .footer {
      background: #2A3A4A;
      color: #B0B8C1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .hero h1 { font-size: 40px; }
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero h1 { font-size: 32px; }
      .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .container { padding: 0 20px; }
      section { padding: 60px 0; }
      .footer-grid { grid-template-columns: 1fr; }
    }