/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --neon-cyan: #00F0FF;
      --deep-space: #0B0C10;
      --dark-navy: #1F1B2D;
      --victory-gold: #FFB800;
      --text-title: #FFFFFF;
      --text-body: #B0B8D0;
      --card-bg: rgba(31, 27, 45, 0.85);
      --card-border: rgba(0, 240, 255, 0.25);
      --card-shadow: 0 8px 32px rgba(0, 240, 255, 0.08);
      --radius-lg: 16px;
      --radius-full: 50px;
      --transition: 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1280px;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--deep-space);
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-space);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      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, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

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

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(11, 12, 16, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.1);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      height: 72px;
      position: relative;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, var(--primary-purple), var(--neon-cyan));
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      color: white;
      font-size: 16px;
    }

    .logo-text {
      font-weight: 700;
      font-size: 20px;
      letter-spacing: 1px;
      background: linear-gradient(to right, #fff, #c0e0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-left, .nav-right {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-link {
      color: var(--text-body);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--neon-cyan);
      box-shadow: 0 0 8px var(--neon-cyan);
      transition: width var(--transition);
    }

    .nav-link:hover {
      color: var(--neon-cyan);
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 1100;
    }

    .hamburger span {
      display: block;
      width: 26px;
      height: 2px;
      background: var(--neon-cyan);
      border-radius: 4px;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(11, 12, 16, 0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      z-index: 1050;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu .nav-link {
      font-size: 24px;
      color: #fff;
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: radial-gradient(circle at 30% 40%, #1a1030 0%, #0B0C10 80%);
      overflow: hidden;
      padding-top: 80px;
    }

    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      z-index: 0;
    }

    .grid-overlay {
      position: absolute;
      inset: 0;
      background-image: 
        linear-gradient(rgba(0,240,255,0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,240,255,0.08) 1px, transparent 1px);
      background-size: 40px 40px;
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 800px;
      padding: 0 24px;
    }

    .hero-content h1 {
      font-size: clamp(36px, 7vw, 56px);
      font-weight: 900;
      color: #fff;
      text-shadow: 0 0 20px rgba(0,240,255,0.5);
      margin-bottom: 24px;
      line-height: 1.2;
    }

    .hero-content .subtitle {
      font-size: 18px;
      font-weight: 300;
      color: #cbd5e0;
      max-width: 600px;
      margin: 0 auto 40px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #7B2FF7, #00F0FF);
      color: white;
      padding: 14px 40px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 18px;
      box-shadow: 0 4px 20px rgba(123,47,247,0.4);
      transition: all 0.3s ease;
      display: inline-block;
    }

    .btn-primary:hover {
      background: linear-gradient(180deg, #7B2FF7, #00F0FF);
      box-shadow: 0 0 28px rgba(0,240,255,0.6);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      padding: 10px 28px;
      border-radius: 50px;
      font-weight: 500;
      transition: all 0.3s;
    }

    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 16px rgba(0,240,255,0.3);
    }

    .section {
      padding: 100px 0;
    }

    .section h2 {
      font-size: clamp(28px, 5vw, 40px);
      font-weight: 800;
      color: #fff;
      margin-bottom: 16px;
      text-align: center;
    }

    .section .section-desc {
      text-align: center;
      color: #a0aec0;
      max-width: 700px;
      margin: 0 auto 48px;
    }

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

    .card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }

    .card:hover {
      border-color: rgba(0,240,255,0.6);
      box-shadow: 0 8px 48px rgba(0,240,255,0.15);
      transform: translateY(-4px);
    }

    .pain-icon {
      width: 48px;
      height: 48px;
      background: rgba(255,184,0,0.15);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--victory-gold);
      font-size: 24px;
    }

    .card h3 {
      color: var(--neon-cyan);
      font-weight: 700;
      margin-bottom: 12px;
      font-size: 20px;
    }

    .cover-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 20px;
      border-top: 4px solid var(--neon-cyan);
    }

    .feature-list {
      list-style: none;
      padding: 0;
      margin: 12px 0;
    }

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 8px;
      color: #cbd5e0;
    }

    .feature-list li::before {
      content: '';
      width: 8px;
      height: 8px;
      background: var(--victory-gold);
      border-radius: 50%;
      display: inline-block;
    }

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

    .stat-item {
      background: rgba(31,27,45,0.7);
      border-radius: 24px;
      padding: 32px 16px;
      border: 1px solid rgba(0,240,255,0.2);
    }

    .stat-number {
      font-size: 48px;
      font-weight: 800;
      background: linear-gradient(135deg, #00F0FF, #7B2FF7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 8px;
    }

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

    .testimonial-card {
      background: rgba(31,27,45,0.9);
      border: 1px solid rgba(0,240,255,0.25);
      border-radius: 24px;
      padding: 28px;
      position: relative;
    }

    .testimonial-card:nth-child(2) {
      margin-top: -20px;
    }

    .testimonial-card:nth-child(1),
    .testimonial-card:nth-child(3) {
      margin-top: 10px;
    }

    .avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      border: 2px solid var(--neon-cyan);
      margin-bottom: 16px;
      background: #2d2a3a;
    }

    .faq-item {
      border-bottom: 1px solid rgba(0,240,255,0.15);
      margin-bottom: 8px;
    }

    .faq-question {
      width: 100%;
      background: transparent;
      color: #fff;
      font-weight: 600;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
      border: none;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #b0b8d0;
      padding: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 150px;
      padding-bottom: 16px;
    }

    .cta-section {
      background: radial-gradient(circle at center, #7B2FF7, #0B0C10);
      padding: 100px 24px;
      text-align: center;
    }

    .footer {
      background: #0B0C10;
      padding: 48px 24px;
      border-top: 1px solid rgba(0,240,255,0.2);
    }

    @media (max-width: 768px) {
      .nav-left, .nav-right {
        display: none;
      }
      .hamburger {
        display: flex;
        margin-left: auto;
      }
      .logo-area {
        position: static;
        transform: none;
      }
      .grid-3, .stats-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .testimonial-card:nth-child(2) {
        margin-top: 0;
      }
      .section {
        padding: 60px 0;
      }
    }