/* roulang page: index */
:root {
      --primary: #7C3AED;
      --primary-glow: rgba(124, 58, 237, 0.25);
      --accent: #06D6A0;
      --accent-soft: rgba(6, 214, 160, 0.18);
      --bg-deep: #0F0F1A;
      --bg-card: #FFFFFF;
      --bg-glass: rgba(15, 15, 26, 0.7);
      --text-primary: #FFFFFF;
      --text-secondary: #B0B0C0;
      --text-dark: #1E1E2F;
      --text-muted: #8888A0;
      --border-light: rgba(255, 255, 255, 0.08);
      --border-card: rgba(255, 255, 255, 0.05);
      --shadow-card: 0 12px 32px rgba(124, 58, 237, 0.12);
      --shadow-hover: 0 20px 44px rgba(124, 58, 237, 0.3);
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-full: 50px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition: all 0.25s ease;
      --spacing-section: 5rem;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-secondary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, textarea {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 导航：卡片化面板 + 毛玻璃 */
    .nav-panel {
      position: sticky;
      top: 1.25rem;
      z-index: 50;
      margin: 1.25rem auto 0;
      max-width: 1200px;
      background: rgba(15, 15, 26, 0.8);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid rgba(124, 58, 237, 0.18);
      border-radius: var(--radius-xl);
      padding: 0.75rem 1.8rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 10px 28px rgba(0,0,0,0.6), 0 0 0 1px rgba(124,58,237,0.25);
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.7rem;
      letter-spacing: -0.3px;
      color: white;
    }
    .logo-icon {
      font-size: 2rem;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.5rem;
    }
    .nav-item {
      display: flex;
      align-items: center;
      gap: 0.4rem;
      color: #CCCCDD;
      font-weight: 500;
      font-size: 1rem;
      transition: var(--transition);
      padding: 0.5rem 0.2rem;
      border-bottom: 2px solid transparent;
    }
    .nav-item i {
      font-size: 1.2rem;
      color: var(--accent);
    }
    .nav-item:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
    .cta-btn-sm {
      background: linear-gradient(135deg, var(--primary), #5B21B6);
      color: white;
      padding: 0.65rem 1.8rem;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 0.95rem;
      transition: var(--transition);
      box-shadow: 0 6px 18px rgba(124,58,237,0.4);
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }
    .cta-btn-sm:hover {
      filter: brightness(1.15);
      transform: scale(1.04);
      box-shadow: 0 10px 24px var(--primary-glow);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--accent);
      border-radius: 4px;
      transition: 0.2s;
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(circle at 30% 40%, rgba(124,58,237,0.25) 0%, transparent 55%), var(--bg-deep);
      padding: 3rem 0 2rem;
    }
    .hero-content {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 3rem;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero-badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      margin: 1.8rem 0 2.2rem;
    }
    .badge {
      background: rgba(124, 58, 237, 0.18);
      color: var(--accent);
      padding: 0.45rem 1.2rem;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.9rem;
      backdrop-filter: blur(4px);
    }
    h1 {
      font-size: clamp(2.8rem, 5vw, 3.8rem);
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: #B0B0C0;
      max-width: 600px;
    }
    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
      margin-top: 2.2rem;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), #5B21B6);
      border: none;
      color: white;
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-full);
      font-weight: 700;
      font-size: 1.1rem;
      transition: var(--transition);
      box-shadow: 0 10px 22px rgba(124,58,237,0.45);
      cursor: pointer;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      padding: 0.9rem 2.4rem;
      border-radius: var(--radius-full);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(6,214,160,0.12);
      border-color: white;
      color: white;
    }
    .hero-visual {
      flex: 1 1 400px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-xl);
      min-height: 360px;
      box-shadow: 0 24px 48px rgba(124,58,237,0.35);
      border: 1px solid rgba(255,255,255,0.1);
    }

    /* 数据看板 */
    .data-dashboard {
      padding: var(--spacing-section) 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 650;
      color: white;
      margin-bottom: 2.8rem;
      text-align: center;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.8rem;
    }
    .stat-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      border: 1px solid rgba(124,58,237,0.25);
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-6px);
      border-color: var(--accent);
      box-shadow: 0 18px 40px rgba(124,58,237,0.3);
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--accent);
      display: flex;
      align-items: baseline;
      gap: 0.3rem;
    }
    .trend {
      font-size: 1rem;
      color: #06D6A0;
      margin-left: 0.3rem;
    }
    .stat-label {
      color: #ccc;
      margin-top: 0.5rem;
    }

    /* 服务矩阵 */
    .features {
      padding: var(--spacing-section) 0;
    }
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .feature-card {
      background: rgba(255,255,255,0.03);
      border-radius: var(--radius-lg);
      padding: 2.5rem 1.8rem;
      border: 1px solid transparent;
      transition: all 0.3s;
      backdrop-filter: blur(4px);
    }
    .feature-card:hover {
      border-color: var(--primary);
      box-shadow: 0 20px 44px rgba(124,58,237,0.35);
      transform: translateY(-8px);
    }
    .icon-box {
      width: 64px;
      height: 64px;
      background: linear-gradient(135deg, var(--primary), #4C1D95);
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 2rem;
      margin-bottom: 1.6rem;
    }
    .feature-card h3 {
      color: white;
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }
    .link-more {
      color: var(--accent);
      font-weight: 600;
      margin-top: 1.2rem;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }

    /* 对比区 */
    .compare {
      padding: var(--spacing-section) 0;
    }
    .compare-row {
      display: flex;
      gap: 2.5rem;
      flex-wrap: wrap;
    }
    .compare-col {
      flex: 1;
      background: rgba(255,255,255,0.02);
      border-radius: var(--radius-lg);
      padding: 2.2rem;
    }
    .progress-item {
      margin: 1.5rem 0;
    }
    .progress-bar {
      height: 8px;
      background: #2D2D3A;
      border-radius: 8px;
      margin-top: 0.3rem;
    }
    .fill {
      height: 100%;
      background: var(--accent);
      border-radius: 8px;
      width: 0%;
    }

    /* FAQ */
    .faq {
      padding: var(--spacing-section) 0;
    }
    .accordion-item {
      border-bottom: 1px solid rgba(255,255,255,0.07);
      padding: 1.4rem 0;
    }
    .accordion-header {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      color: white;
      cursor: pointer;
      font-size: 1.2rem;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #1E1035, #0B0B1A);
      padding: 4rem 2rem;
      border-radius: var(--radius-xl);
      margin: 3rem 0;
    }
    .form-line {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .input-field {
      background: rgba(255,255,255,0.07);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 14px;
      padding: 0.9rem 1.2rem;
      color: white;
      flex: 1;
    }
    .input-field:focus {
      border-color: var(--accent);
    }
    .trust-badges {
      display: flex;
      gap: 2rem;
      margin-top: 1.5rem;
      color: #aaa;
    }

    footer {
      background: #0A0A13;
      padding: 3rem 0;
      color: #999;
    }

    @media (max-width: 1024px) {
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .card-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .stats-grid, .card-grid { grid-template-columns: 1fr; }
      .hero-visual { min-height: 260px; }
    }