/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --accent-pink: #F72585;
      --deep-bg: #0B0C10;
      --card-bg: #1A0A2E;
      --neon-cyan: #00F5D4;
      --text-white: #F0F0F0;
      --text-muted: #B0B0C0;
      --border-dim: #2A1A3E;
      --border-glow: #3A2A5E;
      --radius-lg: 24px;
      --radius-pill: 50px;
      --radius-md: 16px;
      --shadow-card: 0 20px 40px rgba(123, 47, 247, 0.25);
      --shadow-glow: 0 0 25px rgba(123, 47, 247, 0.5);
      --transition: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
      --font-head: 'PingFang SC', 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      --font-number: 'Rajdhani', 'Inter', sans-serif;
    }

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

    body {
      background-color: var(--deep-bg);
      color: var(--text-white);
      font-family: 'PingFang SC', 'Noto Sans SC', 'Inter', system-ui, sans-serif;
      line-height: 1.6;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

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

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

    /* 导航 */
    .nav-bar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 12, 16, 0.8);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(123, 47, 247, 0.25);
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      padding: 0 32px;
    }

    .logo {
      font-family: var(--font-head);
      font-weight: 800;
      font-size: 1.9rem;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, var(--primary-purple), var(--accent-pink));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo small {
      font-size: 0.8rem;
      font-weight: 400;
      background: none;
      -webkit-text-fill-color: var(--text-muted);
      color: var(--text-muted);
      letter-spacing: 0.3px;
      margin-left: 4px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
      color: var(--text-muted);
    }

    .nav-links a {
      transition: color 0.2s;
      font-size: 1rem;
    }

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

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-purple), var(--accent-pink));
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: all 0.25s;
      box-shadow: 0 4px 15px rgba(247, 37, 133, 0.4);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      white-space: nowrap;
    }

    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 0 30px rgba(247, 37, 133, 0.7);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--neon-cyan);
      color: var(--neon-cyan);
      padding: 10px 26px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: 0.25s;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: var(--neon-cyan);
      color: #0B0C10;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: radial-gradient(circle at 20% 30%, #3A1A6E 0%, #0B0C10 75%);
      overflow: hidden;
      padding-top: 72px;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      padding: 0 32px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 500px;
    }

    .hero h1 {
      font-size: 3.8rem;
      font-weight: 800;
      letter-spacing: -1px;
      background: linear-gradient(to right, #C084FC, #F72585);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      font-family: var(--font-head);
    }

    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-muted);
      max-width: 550px;
      margin-bottom: 2rem;
    }

    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
      position: relative;
    }

    .data-panel {
      background: rgba(26, 10, 46, 0.8);
      backdrop-filter: blur(12px);
      border-radius: 32px;
      border: 1px solid var(--border-glow);
      padding: 24px 28px;
      box-shadow: var(--shadow-card);
      width: 320px;
      transform: perspective(600px) rotateY(-5deg);
    }

    .stat-big {
      font-family: var(--font-number);
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--neon-cyan);
      line-height: 1;
    }

    .float-cta {
      position: fixed;
      bottom: 30px;
      right: 30px;
      z-index: 99;
    }

    /* sections */
    section {
      padding: 100px 0;
    }

    .section-title h2 {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 15px;
      color: white;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      border: 1px solid var(--border-dim);
      transition: all 0.35s;
    }

    .card:hover {
      border-color: var(--neon-cyan);
      transform: translateY(-8px);
      box-shadow: 0 20px 40px rgba(123, 47, 247, 0.4);
    }

    .icon-neon {
      font-size: 2.2rem;
      color: var(--neon-cyan);
      margin-bottom: 20px;
    }

    .badge-number {
      font-family: var(--font-number);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--neon-cyan);
      margin-top: 16px;
    }

    .testimonial-card {
      background: var(--card-bg);
      border-radius: 24px;
      padding: 32px;
      border-left: 4px solid var(--neon-cyan);
    }

    .faq-item {
      border-bottom: 1px solid var(--border-dim);
      padding: 20px 0;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-item h3 {
      font-weight: 600;
      font-size: 1.3rem;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 15px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 16px;
        left: 10px;
        right: 10px;
        background: rgba(11, 12, 16, 0.9);
        backdrop-filter: blur(20px);
        border-radius: 40px;
        padding: 8px 12px;
        justify-content: space-around;
        border: 1px solid var(--border-glow);
        z-index: 110;
      }
      .mobile-bottom-nav a {
        color: var(--text-muted);
        font-size: 0.8rem;
        display: flex;
        flex-direction: column;
        align-items: center;
      }
      .mobile-bottom-nav .cta-mobile {
        background: linear-gradient(135deg, var(--primary-purple), var(--accent-pink));
        border-radius: 30px;
        padding: 10px 20px;
        color: white;
        margin-top: -20px;
      }
      .hero h1 { font-size: 2.5rem; }
      .hero-content { flex-direction: column; text-align: center; }
      .grid-4 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .float-cta { bottom: 90px; }
    }