/* roulang page: index */
:root {
      --primary: #6C3CEC;
      --primary-dark: #5A2DD0;
      --accent-cyan: #00E5A0;
      --accent-amber: #FF7A3D;
      --bg-light: #F9F8FC;
      --bg-white: #FFFFFF;
      --bg-dark: #1E1B2E;
      --text-heading: #1A1530;
      --text-body: #3A3650;
      --text-muted: #8B86A0;
      --border-light: #E5E1F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-container: 16px;
      --shadow-card: 0 4px 20px rgba(108,60,236,0.08);
      --shadow-hover: 0 12px 32px rgba(108,60,236,0.15);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition-default: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      color: var(--text-heading);
      font-weight: 700;
      margin-top: 0;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color var(--transition-default);
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 40;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      height: 72px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 24px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-cyan) 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 2px;
      display: inline-block;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

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

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

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width var(--transition-default);
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .mega-trigger {
      cursor: pointer;
      font-weight: 600;
      color: var(--text-body);
      background: transparent;
      border: none;
      padding: 8px 12px;
      border-radius: var(--radius-btn);
      transition: background 0.2s;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .mega-trigger i {
      transition: transform 0.2s;
    }

    .mega-panel {
      position: absolute;
      top: 72px;
      right: 0;
      width: 600px;
      background: var(--bg-white);
      border-radius: var(--radius-card);
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
      padding: 24px;
      display: none;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 20px;
      border: 1px solid var(--border-light);
      z-index: 50;
    }

    .mega-wrapper {
      position: relative;
    }

    .mega-wrapper:hover .mega-panel,
    .mega-wrapper:focus-within .mega-panel {
      display: grid;
    }

    .mega-wrapper:hover .mega-trigger {
      background: #F0ECFF;
      color: var(--primary);
    }

    .mega-panel .mega-card {
      background: var(--bg-light);
      border-radius: var(--radius-card);
      padding: 12px;
      text-align: center;
    }

    .mega-card img {
      border-radius: 8px;
      margin-bottom: 8px;
    }

    .mobile-menu-icon {
      display: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--primary);
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 16px;
      }
      .mega-panel {
        width: 90vw;
        right: -20px;
      }
    }

    @media (max-width: 640px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        gap: 16px;
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-icon {
        display: block;
      }
      .mega-wrapper {
        display: none;
      }
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
      font-size: 16px;
      letter-spacing: 1px;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: inset 0 0 0 1px var(--accent-cyan);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: all 0.25s;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .btn-cyan {
      background: var(--accent-cyan);
      color: #1A1530;
      font-weight: 700;
    }

    /* Hero */
    #hero {
      min-height: 90vh;
      background: linear-gradient(90deg, rgba(108,60,236,0.75) 0%, rgba(0,0,0,0.1) 80%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
    }

    .hero-content h1 {
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-content .highlight {
      color: var(--accent-cyan);
      text-decoration: underline;
      text-decoration-color: var(--accent-cyan);
    }

    @media (max-width: 640px) {
      .hero-content h1 {
        font-size: 34px;
      }
    }

    /* 板块标题 */
    .section-title {
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 4px;
      background: var(--accent-cyan);
      margin-top: 8px;
    }

    /* 卡片通用 */
    .card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all var(--transition-default);
      padding: 28px;
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .feature-tag {
      width: 48px;
      height: 4px;
      background: var(--accent-cyan);
      margin-bottom: 16px;
      transition: width 0.2s;
    }

    .card:hover .feature-tag {
      width: 64px;
      background: var(--accent-amber);
    }

    /* 场景图文 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }

    .scenario-img img {
      border-radius: var(--radius-container);
      box-shadow: 0 8px 24px rgba(0,0,0,0.08);
    }

    @media (max-width: 768px) {
      .scenario-row {
        flex-direction: column;
      }
    }

    /* 案例卡片 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 12px;
      scrollbar-width: thin;
    }

    .case-card {
      min-width: 280px;
      background: white;
      border-radius: var(--radius-card);
      padding: 20px;
    }

    .stat-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--accent-cyan);
    }

    /* FAQ */
    .accordion-item {
      background: var(--bg-light);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .accordion-title {
      background: #F9F8FC;
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      border-left: 3px solid transparent;
      transition: 0.2s;
    }

    .accordion-content {
      padding: 0 24px 18px;
      display: none;
    }

    .accordion-item.active .accordion-title {
      background: white;
      border-left-color: var(--primary);
    }

    .accordion-item.active .accordion-content {
      display: block;
    }

    /* 价格卡片 */
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      text-align: center;
    }

    .pricing-card.popular {
      border: 2px solid var(--primary);
      box-shadow: 0 15px 30px rgba(108,60,236,0.2);
    }

    .price {
      font-size: 44px;
      font-weight: 800;
      color: var(--primary);
    }

    /* Footer */
    .footer {
      background: var(--bg-dark);
      color: #B5B0C8;
      padding: 60px 0 20px;
    }

    .footer a:hover {
      color: var(--accent-cyan);
    }

    .copyright {
      border-top: 1px solid #3A3650;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
    }

    /* 动画 */
    @keyframes breathe {
      0% { box-shadow: 0 0 0 0 rgba(0,229,160,0.4); }
      70% { box-shadow: 0 0 0 12px rgba(0,229,160,0); }
      100% { box-shadow: 0 0 0 0 rgba(0,229,160,0); }
    }

    .breathe {
      animation: breathe 2s infinite;
    }