/* roulang page: index */
:root {
      --primary: #7C3AED;
      --primary-glow: #8B5CF6;
      --accent: #00F0B5;
      --accent-glow: rgba(0, 240, 181, 0.5);
      --warm: #FF6B35;
      --bg-deep: #0F0F1A;
      --bg-alt: #1A1525;
      --card-bg: rgba(25, 20, 40, 0.85);
      --text-primary: #FFFFFF;
      --text-body: #C4B5E0;
      --text-muted: #8B7AA0;
      --border-light: rgba(124, 58, 237, 0.25);
      --border-glow: rgba(0, 240, 181, 0.4);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-pill: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(124, 58, 237, 0.15) inset;
      --shadow-elevated: 0 16px 48px rgba(124, 58, 237, 0.3);
      --transition: all 0.3s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Noto Sans SC', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(15, 15, 26, 0.8);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(124, 58, 237, 0.2);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }

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

    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 8px 0;
    }

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

    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(124, 58, 237, 0.4);
      text-align: center;
    }

    .btn-primary:hover {
      background: var(--primary-glow);
      box-shadow: 0 0 24px rgba(124, 58, 237, 0.6);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid rgba(255, 255, 255, 0.3);
      color: white;
      font-weight: 600;
      font-size: 16px;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-outline:hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 28px;
      height: 2px;
      background: white;
      transition: var(--transition);
    }

    /* Hero */
    .hero {
      padding: 100px 0 80px;
      background: radial-gradient(circle at 30% 30%, #1E1635 0%, #0F0F1A 70%);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 450px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }

    .hero-metrics {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }

    .metric-item {
      display: flex;
      flex-direction: column;
    }

    .metric-number {
      font-family: 'Inter', 'DIN Alternate', sans-serif;
      font-size: 24px;
      font-weight: 700;
      color: var(--accent);
      text-shadow: 0 0 12px rgba(0, 240, 181, 0.5);
    }

    .metric-label {
      font-size: 13px;
      color: var(--text-muted);
    }

    .hero-image {
      background: rgba(25, 20, 40, 0.7);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 0 40px rgba(124, 58, 237, 0.35);
      border: 1px solid var(--border-light);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 通用区块 */
    .section {
      padding: 100px 0;
    }

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      color: white;
      margin-bottom: 16px;
      text-align: center;
    }

    .title-decor {
      width: 64px;
      height: 4px;
      background: var(--primary);
      margin: 0 auto 48px;
      border-radius: 2px;
    }

    /* 数据看板 */
    .data-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .data-card {
      background: rgba(26, 21, 37, 0.7);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-md);
      padding: 32px 16px;
      border: 1px solid rgba(255,255,255,0.05);
    }

    .data-number {
      font-family: 'Inter', 'DIN Alternate', sans-serif;
      font-size: 56px;
      font-weight: 700;
      color: var(--accent);
      text-shadow: 0 0 20px var(--accent-glow);
      line-height: 1.1;
    }

    .data-label {
      color: var(--text-muted);
      margin-top: 8px;
      font-size: 15px;
    }

    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-elevated);
      border-color: var(--border-glow);
    }

    .card-icon {
      font-size: 40px;
      margin-bottom: 20px;
      color: var(--accent);
    }

    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: white;
      margin-bottom: 12px;
    }

    .service-card p {
      color: var(--text-body);
      margin-bottom: 24px;
      flex: 1;
    }

    .text-link {
      color: var(--accent);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .text-link:hover {
      text-decoration: underline;
    }

    /* 对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-card {
      background: rgba(20, 20, 35, 0.8);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid rgba(255,255,255,0.1);
    }

    .compare-card.recommended {
      background: rgba(30, 22, 53, 0.9);
      border: 2px solid var(--primary);
      box-shadow: 0 0 30px rgba(124, 58, 237, 0.3);
      position: relative;
    }

    .badge {
      background: var(--warm);
      color: white;
      font-size: 13px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 16px;
    }

    .compare-title {
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin: 12px 0 20px;
    }

    .compare-list {
      list-style: none;
    }

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      color: var(--text-body);
    }

    .check-green {
      color: var(--accent);
      font-weight: bold;
      font-size: 18px;
    }

    .cross-muted {
      color: var(--text-muted);
      font-weight: bold;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    details.faq-item {
      background: rgba(26, 21, 37, 0.8);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      padding: 20px 24px;
      border-left: 4px solid var(--accent);
      cursor: pointer;
      transition: var(--transition);
    }

    details.faq-item[open] {
      background: rgba(30, 25, 45, 0.9);
    }

    summary {
      font-size: 18px;
      font-weight: 600;
      color: white;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    summary::-webkit-details-marker {
      display: none;
    }

    .faq-icon {
      font-size: 24px;
      color: var(--accent);
      transition: var(--transition);
    }

    details[open] .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      margin-top: 16px;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(180deg, #1E1635 0%, #0F0F1A 100%);
    }

    .cta-box {
      text-align: center;
    }

    .cta-box h2 {
      font-size: 36px;
      color: white;
      margin-bottom: 16px;
    }

    .cta-form {
      display: flex;
      max-width: 560px;
      margin: 32px auto 12px;
      gap: 12px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .cta-input {
      flex: 1;
      min-width: 220px;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: var(--radius-pill);
      padding: 14px 24px;
      color: white;
      font-size: 16px;
      transition: var(--transition);
    }

    .cta-input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 12px rgba(0,240,181,0.4);
    }

    .privacy-note {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Footer */
    .footer {
      background: #0A0A13;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }

    .footer-desc {
      color: var(--text-muted);
      margin-bottom: 20px;
    }

    .social-icons {
      display: flex;
      gap: 16px;
    }

    .social-circle {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      border: 1px solid rgba(255,255,255,0.2);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      transition: var(--transition);
    }

    .social-circle:hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer-col a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 10px;
      font-size: 15px;
    }

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

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      text-align: center;
      color: var(--text-muted);
      font-size: 14px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .cards-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .data-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        background: #0F0F1A;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        z-index: 40;
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        font-size: 20px;
        color: white;
      }
      .cards-grid, .compare-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 32px;
      }
      .section-title {
        font-size: 26px;
      }
      .data-number {
        font-size: 40px;
      }
    }

    @media (max-width: 520px) {
      .hero-buttons {
        flex-direction: column;
      }
      .btn-primary, .btn-outline {
        width: 100%;
        justify-content: center;
      }
    }