/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --secondary: #00F0FF;
      --bg-deep: #0D0F14;
      --surface: #161B24;
      --text-primary: #EDF0F5;
      --text-secondary: #8892A6;
      --border-dim: rgba(123, 47, 247, 0.15);
      --border-glow: rgba(0, 240, 255, 0.4);
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
      --radius-lg: 16px;
      --radius-pill: 50px;
      --transition: 0.3s ease;
      --container-max: 1280px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 40px;
    }

    @media (max-width: 1024px) {
      .container {
        padding: 0 32px;
      }
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(13, 15, 20, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-dim);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      color: var(--text-secondary);
      font-weight: 500;
    }

    .nav-links a {
      font-size: 0.95rem;
    }

    .nav-links a:hover {
      color: var(--secondary);
    }

    .cta-btn {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: all var(--transition);
      box-shadow: 0 0 12px rgba(123, 47, 247, 0.4);
    }

    .cta-btn:hover {
      filter: brightness(1.2);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 25px;
      height: 3px;
      background: var(--secondary);
      border-radius: 3px;
      transition: var(--transition);
    }

    @media (max-width: 1024px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    .mobile-menu {
      position: fixed;
      top: 72px;
      right: 0;
      width: 70%;
      max-width: 320px;
      height: calc(100vh - 72px);
      background: var(--bg-deep);
      border-left: 1px solid var(--border-dim);
      padding: 2rem;
      display: flex;
      flex-direction: column;
      gap: 2rem;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }

    .mobile-menu.active {
      transform: translateX(0);
    }

    .mobile-menu a {
      font-size: 1.2rem;
      color: var(--text-secondary);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding-bottom: 1rem;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding-top: 72px;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(13, 15, 20, 0.75);
      backdrop-filter: blur(2px);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      width: 100%;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
    }

    .hero .subtitle {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }

    .micro-stats {
      display: flex;
      justify-content: center;
      gap: 3rem;
      margin: 2rem 0;
      flex-wrap: wrap;
    }

    .micro-stat span {
      display: block;
      font-weight: 700;
      color: var(--secondary);
      font-size: 1.8rem;
    }

    .micro-stat small {
      color: var(--text-secondary);
      font-size: 0.9rem;
    }

    .hero-actions {
      display: flex;
      gap: 1.5rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: all var(--transition);
    }

    .btn-primary:hover {
      filter: brightness(1.2);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
    }

    .btn-outline {
      border: 2px solid var(--secondary);
      color: var(--secondary);
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: all var(--transition);
      background: transparent;
    }

    .btn-outline:hover {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      border-color: transparent;
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 36px;
      }
      .micro-stats {
        gap: 1.5rem;
      }
    }

    section {
      padding: 120px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 64px 0;
      }
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 2rem;
      text-align: center;
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 28px;
      }
    }

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

    @media (max-width: 768px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    .stat-card {
      background: #1a1f2b;
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-lg);
      padding: 2rem 1.5rem;
      text-align: center;
      box-shadow: var(--shadow-card);
    }

    .stat-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--secondary);
    }

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

    @media (max-width: 1024px) {
      .grid-services {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .grid-services {
        grid-template-columns: 1fr;
      }
    }

    .service-card {
      background: var(--surface);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: all var(--transition);
      box-shadow: var(--shadow-card);
    }

    .service-card:hover {
      border-color: var(--border-glow);
      transform: translateY(-4px);
      box-shadow: 0 8px 30px rgba(0,0,0,0.5);
    }

    .service-img {
      width: 64px;
      height: 64px;
      background: rgba(123,47,247,0.1);
      border-radius: 12px;
      margin-bottom: 1.5rem;
    }

    .comparison {
      display: flex;
      gap: 2rem;
      align-items: stretch;
    }

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

    .compare-card {
      flex: 1;
      background: var(--surface);
      border-radius: var(--radius-lg);
      padding: 2rem;
      border: 1px solid var(--border-dim);
    }

    .compare-card.recommended {
      border-color: var(--primary);
      box-shadow: 0 0 20px rgba(123,47,247,0.3);
      position: relative;
    }

    .badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--primary);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    .compare-row {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .faq-item {
      background: var(--surface);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-lg);
      margin-bottom: 1rem;
      overflow: hidden;
    }

    .faq-question {
      padding: 1.5rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 1.5rem 1.5rem;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .form-group {
      margin-bottom: 1.5rem;
    }

    .form-input {
      width: 100%;
      background: #0b0e14;
      border: 1px solid rgba(123,47,247,0.3);
      border-radius: 12px;
      padding: 14px;
      color: white;
      transition: var(--transition);
    }

    .form-input:focus {
      border-color: var(--secondary);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }

    .footer {
      background: var(--bg-deep);
      border-top: 1px solid rgba(123,47,247,0.2);
      padding: 4rem 0 2rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    .footer-links a {
      display: block;
      color: var(--text-secondary);
      margin-bottom: 0.5rem;
    }

    .footer-links a:hover {
      color: var(--secondary);
    }