/* roulang page: index */
:root {
      --bg-deep: #0B0C2A;
      --bg-darker: #0F1423;
      --primary-purple: #A855F7;
      --primary-cyan: #00D2FF;
      --glass-bg: rgba(20, 25, 50, 0.6);
      --glass-border: rgba(168, 85, 247, 0.2);
      --text-bright: #ffffff;
      --text-light: #E2E8F0;
      --text-muted: #94A3B8;
      --radius-card: 20px;
      --radius-pill: 50px;
      --shadow-glow: 0 12px 40px rgba(168, 85, 247, 0.25);
      --font-display: 'Inter', system-ui, -apple-system, 'Microsoft YaHei', sans-serif;
      --transition-bounce: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

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

    body {
      font-family: var(--font-display);
      background: radial-gradient(ellipse at 20% 20%, #101634 0%, #0B0C2A 60%, #06081F 100%);
      color: var(--text-light);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 15, 30, 0.75);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(168, 85, 247, 0.25);
      transition: background 0.3s;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: white;
      text-decoration: none;
      background: linear-gradient(135deg, #A855F7 20%, #00D2FF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      filter: drop-shadow(0 0 8px rgba(168, 85, 247, 0.7));
      white-space: nowrap;
    }

    .logo-icon {
      font-size: 1.9rem;
      filter: drop-shadow(0 0 10px #A855F7);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      color: var(--text-light);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.3s;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: linear-gradient(90deg, #A855F7, #00D2FF);
      border-radius: 50px;
      transition: width 0.3s ease;
      box-shadow: 0 0 12px #A855F7;
    }

    .nav-menu a:hover {
      color: white;
    }

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

    .btn-primary {
      background: linear-gradient(135deg, #A855F7 0%, #00D2FF 100%);
      border: none;
      color: white;
      font-weight: 700;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      cursor: pointer;
      font-size: 0.95rem;
      letter-spacing: 0.5px;
      box-shadow: 0 0 18px rgba(168, 85, 247, 0.6);
      transition: all 0.3s ease;
      text-decoration: none;
      display: inline-block;
    }

    .btn-primary:hover {
      transform: scale(1.06);
      box-shadow: 0 0 28px rgba(0, 210, 255, 0.8);
      filter: brightness(1.1);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid rgba(168, 85, 247, 0.5);
      color: white;
      font-weight: 600;
      padding: 10px 26px;
      border-radius: var(--radius-pill);
      transition: all 0.3s;
      text-decoration: none;
      backdrop-filter: blur(8px);
    }

    .btn-secondary:hover {
      border-color: #00D2FF;
      background: rgba(168, 85, 247, 0.12);
      color: white;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      z-index: 1100;
    }

    .hamburger span {
      width: 28px;
      height: 3px;
      background: white;
      border-radius: 10px;
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: rgba(8, 10, 28, 0.95);
        backdrop-filter: blur(25px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 40px;
        transition: right 0.4s ease;
      }
      .nav-menu.active {
        right: 0;
      }
      .nav-menu a {
        font-size: 1.5rem;
      }
      .btn-primary-mobile {
        display: none;
      }
    }

    section {
      padding: 100px 0;
    }

    h2 {
      font-size: clamp(2rem, 4.5vw, 2.8rem);
      font-weight: 800;
      margin-bottom: 18px;
      color: white;
      letter-spacing: -0.5px;
    }

    .section-tag {
      color: #A855F7;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 2px;
      margin-bottom: 10px;
    }

    /* Hero */
    .hero {
      padding: 140px 0 120px;
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      background-color: rgba(11, 12, 42, 0.5);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }

    .hero h1 {
      font-size: clamp(3rem, 7vw, 4.5rem);
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 24px;
      background: linear-gradient(to right, #ffffff 0%, #cfc9ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      text-shadow: 0 0 50px rgba(168, 85, 247, 0.5);
    }

    .hero p {
      font-size: 1.3rem;
      color: var(--text-light);
      margin-bottom: 36px;
      max-width: 600px;
    }

    .cta-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    /* 卡片网格 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 32px;
      margin-top: 50px;
    }

    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      transition: all 0.35s ease;
      box-shadow: 0 10px 25px rgba(168, 85, 247, 0.1);
    }

    .glass-card:hover {
      transform: translateY(-8px);
      border-color: rgba(0, 210, 255, 0.5);
      box-shadow: 0 20px 45px rgba(168, 85, 247, 0.3);
    }

    .icon-wrap {
      font-size: 2.6rem;
      margin-bottom: 20px;
      color: #A855F7;
      filter: drop-shadow(0 0 12px #A855F7);
    }

    .glass-card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
      color: white;
    }

    /* 场景卡片交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-top: 50px;
      flex-wrap: wrap;
    }

    .scenario-img {
      flex: 1;
      min-width: 280px;
      border-radius: 28px;
      overflow: hidden;
      border: 1px solid rgba(168, 85, 247, 0.3);
    }

    .scenario-img img {
      width: 100%;
      display: block;
      object-fit: cover;
    }

    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: 20px;
      margin-bottom: 18px;
      padding: 20px 26px;
      cursor: pointer;
      transition: 0.3s;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 700;
      color: white;
      font-size: 1.1rem;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.45s ease;
      color: var(--text-muted);
      margin-top: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 8px;
    }

    footer {
      background: #080b1f;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(168, 85, 247, 0.2);
    }

    @media (max-width: 768px) {
      .scenario-row {
        flex-direction: column;
      }
      .hide-mobile {
        display: none;
      }
    }