/* roulang page: index */
:root {
      --primary: #6C3CFC;
      --primary-light: #8B6CFC;
      --accent: #FF4D6A;
      --dark-bg: #1A1A2E;
      --surface: #FFFFFF;
      --bg-light: #F8F7FF;
      --text-primary: #1E1E2F;
      --text-secondary: #5A5A72;
      --text-on-dark: #E8E8F0;
      --border-light: #E9E7F5;
      --shadow-card: 0 8px 28px rgba(108, 60, 252, 0.08);
      --shadow-hover: 0 16px 40px rgba(108, 60, 252, 0.16);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-btn: 14px;
      --transition: all 0.25s ease;
      --font-number: 'DIN Alternate', 'Inter', 'PingFang SC', sans-serif;
      --font-body: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', 'Inter', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }

    /* 导航栏 */
    .header {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 50;
      border-bottom: 1px solid var(--border-light);
      transition: box-shadow 0.3s;
    }
    .header.scrolled {
      box-shadow: 0 6px 20px rgba(0,0,0,0.04);
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      font-size: 2rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 36px;
    }
    .nav-menu a {
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
    }
    .nav-menu a.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.3s;
      box-shadow: 0 4px 14px rgba(108, 60, 252, 0.3);
      display: inline-block;
    }
    .btn-primary:hover {
      transform: scale(1.02);
      box-shadow: 0 8px 22px rgba(108, 60, 252, 0.45);
      background: linear-gradient(135deg, #7B4DFC 0%, #FF5E7A 100%);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(108, 60, 252, 0.06);
    }
    .btn-text {
      color: var(--primary);
      font-weight: 600;
      padding: 8px 4px;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .btn-text:hover {
      border-bottom-color: var(--primary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--primary);
      border-radius: 4px;
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 60px 0 80px;
      position: relative;
      background: radial-gradient(circle at 80% 20%, rgba(108,60,252,0.12) 0%, transparent 55%);
    }
    .hero-content {
      flex: 0 0 50%;
    }
    .hero h1 {
      font-size: 3.4rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 460px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
    }
    .badge-group {
      display: flex;
      gap: 20px;
    }
    .badge {
      background: white;
      border-radius: 40px;
      padding: 8px 18px;
      box-shadow: 0 6px 18px rgba(0,0,0,0.04);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .badge-number {
      font-family: var(--font-number);
      font-size: 1.4rem;
      color: var(--accent);
      font-weight: 700;
    }
    .hero-visual {
      flex: 0 0 45%;
      border-radius: 32px;
      overflow: hidden;
      box-shadow: 0 30px 50px rgba(108,60,252,0.2);
    }
    .hero-visual img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .card {
      background: var(--surface);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(108,60,252,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 1.5rem;
    }
    .card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }

    .bg-alternate {
      background: white;
    }

    /* 功能标签组 */
    .feature-tabs {
      display: flex;
      gap: 12px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }
    .tab-pill {
      padding: 8px 22px;
      border-radius: 40px;
      font-weight: 500;
      background: white;
      border: 1px solid var(--border-light);
      cursor: pointer;
      transition: 0.2s;
    }
    .tab-pill.active {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    .pricing-card {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
    }
    .pricing-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 15px 30px rgba(108,60,252,0.15);
      position: relative;
    }
    .popular-badge {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: white;
      padding: 4px 22px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .cta-dark {
      background: var(--dark-bg);
      color: white;
      text-align: center;
      border-radius: 32px;
      padding: 70px 30px;
      margin: 40px 0;
    }

    .footer {
      background: var(--dark-bg);
      color: var(--text-on-dark);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 992px) {
      .grid-3, .grid-4 { grid-template-columns: repeat(2,1fr); }
      .hero { flex-direction: column; text-align: center; }
      .hero-content { margin-bottom: 40px; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active { display: flex; flex-direction: column; background: white; padding: 20px; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.4rem; }
    }