/* roulang page: index */
:root {
      --primary: #7B2FBE;
      --primary-glow: #9b4de0;
      --accent: #3D1CE5;
      --gold: #F5A623;
      --gold-soft: #f7b84c;
      --bg-deep: #0D0D0D;
      --bg-card: #1A1A2E;
      --bg-section: #10101a;
      --text-primary: #F0F0F5;
      --text-secondary: #B0B0C0;
      --text-muted: #6B6B80;
      --border-subtle: rgba(125, 47, 190, 0.3);
      --border-glow: rgba(125, 47, 190, 0.6);
      --shadow-card: 0 8px 28px rgba(125, 47, 190, 0.18);
      --shadow-glow: 0 0 18px rgba(125, 47, 190, 0.4);
      --radius-sm: 8px;
      --radius-btn: 6px;
      --radius-card: 12px;
      --font-heading: 'Segoe UI', 'SF Pro Display', 'Inter', system-ui, -apple-system, sans-serif;
      --font-body: 'Segoe UI', 'Inter', 'SF Pro Text', system-ui, -apple-system, sans-serif;
      --font-mono: 'Roboto Mono', 'Cascadia Code', 'Fira Code', monospace;
      --max-width: 1280px;
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-body);
      line-height: 1.5;
      letter-spacing: 0.2px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 - 透明玻璃沉浸 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(13, 13, 13, 0.6);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(125, 47, 190, 0.2);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .site-header.scrolled {
      background: rgba(13, 13, 13, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
      text-decoration: none;
      letter-spacing: 1px;
    }
    .logo i {
      color: var(--gold);
      font-size: 1.8rem;
      text-shadow: 0 0 10px var(--gold);
    }
    .logo span {
      background: linear-gradient(135deg, #e0c3ff 0%, #b380ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-primary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--gold);
    }
    .btn-nav {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: all 0.2s;
      font-size: 0.9rem;
      margin-left: 8px;
      text-decoration: none;
      box-shadow: 0 0 12px rgba(125,47,190,0.5);
    }
    .btn-nav:hover {
      background: #8b3fd6;
      box-shadow: 0 0 20px rgba(154, 77, 224, 0.7);
      color: white;
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 20%, rgba(61,28,229,0.25) 0%, transparent 45%),
                  radial-gradient(circle at 80% 50%, rgba(125,47,190,0.3) 0%, transparent 55%),
                  var(--bg-deep);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      position: relative;
      padding-top: 80px;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(13,13,13,0.65);
      z-index: 1;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .hero-content {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-family: var(--font-heading);
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: white;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .hero h1 .highlight {
      color: var(--gold);
      text-shadow: 0 0 15px var(--gold);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #d0cce0;
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      transition: all 0.25s;
      box-shadow: 0 4px 18px rgba(125,47,190,0.5);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: #9340e6;
      box-shadow: 0 8px 28px rgba(154,77,224,0.8);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-outline:hover {
      background: var(--primary);
      box-shadow: 0 0 18px rgba(125,47,190,0.7);
    }

    .hero-stats {
      flex: 0 0 320px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .stat-card {
      background: rgba(26,26,46,0.8);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 18px 20px;
      display: flex;
      align-items: center;
      gap: 14px;
      box-shadow: var(--shadow-card);
    }
    .stat-icon {
      font-size: 2rem;
      color: var(--gold);
    }
    .stat-value {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 700;
      color: white;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-secondary);
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: white;
      position: relative;
    }
    .section-title i {
      color: var(--gold);
      margin-right: 10px;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .metric-item {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      padding: 28px 16px;
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--gold);
    }

    /* 优势区 - 不对称网格 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 24px;
      margin-top: 32px;
    }
    .large-card {
      background: linear-gradient(145deg, #1f1b33, #16132b);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      position: relative;
    }
    .large-card img {
      width: 100%;
      height: 260px;
      object-fit: cover;
      display: block;
    }
    .large-content {
      padding: 24px;
    }
    .small-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .small-card {
      background: var(--bg-card);
      border-radius: var(--radius-sm);
      padding: 22px;
      border: 1px solid var(--border-subtle);
      transition: 0.2s;
    }
    .small-card:hover {
      border-color: var(--border-glow);
      box-shadow: 0 0 18px rgba(125,47,190,0.35);
    }

    /* 对比表 */
    .compare-table {
      display: flex;
      gap: 0;
      margin-top: 32px;
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .compare-col {
      flex: 1;
      padding: 28px;
    }
    .compare-left {
      background: #21212e;
      color: #aaa;
    }
    .compare-right {
      background: #2a1e4a;
      border-left: 2px solid var(--primary);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 32px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid rgba(125,47,190,0.25);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    /* 表单 */
    .form-wrap {
      max-width: 480px;
      margin: 0 auto;
      background: var(--bg-card);
      padding: 36px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-subtle);
    }
    .form-wrap input {
      width: 100%;
      padding: 12px;
      margin: 12px 0;
      background: #0e0e1a;
      border: 1px solid var(--border-subtle);
      color: white;
      border-radius: 6px;
    }
    .form-wrap input:focus {
      border-color: var(--primary);
      outline: none;
    }

    /* 页脚 */
    .footer {
      background: #08080f;
      padding: 48px 0 24px;
      border-top: 1px solid var(--border-subtle);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 28px;
    }

    @media (max-width: 768px) {
      .header-inner {
        flex-wrap: wrap;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background: #0d0d0df0;
        padding: 20px;
      }
      .nav-links.open {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero .container {
        flex-direction: column;
      }
      .metrics-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .advantage-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 480px) {
      .metrics-grid {
        grid-template-columns: 1fr;
      }
    }