/* roulang page: index */
:root {
      --primary: #7B2FFF;
      --secondary: #00F0FF;
      --accent: #FFD700;
      --bg-dark: #0D0D0D;
      --bg-card: #1A1A1A;
      --bg-light-section: #F5F0FF;
      --text-primary: #FFFFFF;
      --text-secondary: #B0A0CC;
      --text-on-accent: #0D0D0D;
      --border-glow: rgba(0, 240, 255, 0.25);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-pill: 50px;
      --shadow-card: 0 12px 28px rgba(0, 0, 0, 0.5);
      --shadow-glow: 0 0 24px rgba(123, 47, 255, 0.5);
      --font-mono: 'DIN Alternate', 'Roboto Mono', 'Courier New', monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-primary);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }

    h1, h2, h3, h4, .display-font {
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    .text-mono {
      font-family: var(--font-mono);
    }

    .bg-dark-section {
      background-color: var(--bg-dark);
    }
    .bg-card {
      background-color: var(--bg-card);
    }
    .bg-light-section {
      background-color: var(--bg-light-section);
    }
    .text-secondary-custom {
      color: var(--text-secondary) !important;
    }
    .text-neon {
      color: var(--secondary);
    }
    .text-purple {
      color: var(--primary);
    }
    .border-neon {
      border-color: var(--secondary) !important;
    }

    /* 导航栏自定义 */
    .navbar-custom {
      background-color: rgba(13, 13, 13, 0.92);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(to right, rgba(0,240,255,0) 0%, rgba(0,240,255,0.15) 50%, rgba(0,240,255,0) 100%);
      background-size: 100% 1px;
      background-position: bottom;
      background-repeat: no-repeat;
      height: 72px;
      padding: 0;
      transition: all 0.25s ease;
    }
    .navbar-brand {
      font-weight: 900;
      font-size: 1.8rem;
      color: var(--primary) !important;
      letter-spacing: -0.5px;
    }
    .navbar-brand i {
      color: var(--accent);
      margin-right: 4px;
    }
    .nav-link {
      color: var(--text-secondary) !important;
      font-weight: 600;
      margin: 0 8px;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--secondary) !important;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary);
      border-radius: 2px;
    }
    .btn-cta-nav {
      background: var(--accent);
      color: var(--text-on-accent);
      font-weight: 700;
      border-radius: var(--radius-pill);
      padding: 10px 28px;
      border: none;
      transition: all 0.25s;
      white-space: nowrap;
    }
    .btn-cta-nav:hover {
      background: #FFE44D;
      box-shadow: 0 0 28px rgba(255, 215, 0, 0.7);
      color: #0D0D0D;
    }

    /* 按钮系统 */
    .btn-gold {
      background: var(--accent);
      color: var(--text-on-accent);
      font-weight: 700;
      border-radius: var(--radius-pill);
      padding: 14px 36px;
      border: none;
      transition: all 0.3s ease;
      box-shadow: 0 0 15px rgba(255,215,0,0.3);
      letter-spacing: 0.5px;
    }
    .btn-gold:hover {
      background: #FFE44D;
      box-shadow: 0 0 32px rgba(255,215,0,0.7);
      transform: translateY(-2px);
      color: #0D0D0D;
    }
    .btn-outline-neon {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 12px 32px;
      transition: all 0.3s;
    }
    .btn-outline-neon:hover {
      background: rgba(0,240,255,0.08);
      border-color: #80f0ff;
      color: #ccf8ff;
    }

    /* hero */
    #hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, transparent 10%, rgba(13,13,13,0.85) 90%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 900px;
    }
    .hero-title {
      font-size: clamp(2.5rem, 7vw, 4.5rem);
      font-weight: 900;
      background: linear-gradient(135deg, #B27FFF, #7B2FFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 1.5rem;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.35rem;
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto 2.5rem;
    }

    /* 卡片 */
    .card-custom {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid rgba(0,240,255,0.15);
      transition: all 0.3s ease;
      height: 100%;
    }
    .card-custom:hover {
      border-color: var(--secondary);
      transform: translateY(-8px);
      box-shadow: 0 20px 40px rgba(123,47,255,0.35);
    }
    .feature-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
    }
    @media (max-width: 768px) {
      .feature-grid {
        grid-template-columns: 1fr;
      }
    }

    .scene-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }
    .scene-card {
      min-width: 300px;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid rgba(0,240,255,0.2);
    }
    .scene-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    .pricing-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 36px 24px;
      border: 1px solid rgba(123,47,255,0.3);
      transition: 0.3s;
      position: relative;
    }
    .pricing-card.recommended {
      border: 2px solid var(--accent);
      transform: scale(1.03);
      box-shadow: 0 0 35px rgba(255,215,0,0.25);
    }
    .badge-popular {
      background: var(--primary);
      color: white;
      border-radius: 30px;
      padding: 4px 18px;
      font-size: 0.8rem;
      font-weight: 700;
    }

    .faq-item {
      background: var(--bg-card);
      border-left: 4px solid var(--primary);
      border-radius: 0 12px 12px 0;
      margin-bottom: 16px;
      transition: 0.2s;
    }
    .faq-item[open] {
      border-left-color: var(--secondary);
    }
    .faq-question {
      font-weight: 700;
      font-size: 1.1rem;
      padding: 20px;
      cursor: pointer;
      color: white;
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-secondary);
    }

    .stat-number {
      font-size: 4rem;
      font-weight: 800;
      font-family: var(--font-mono);
      color: var(--secondary);
      line-height: 1;
    }

    footer {
      background: #050505;
      border-top: 1px solid;
      border-image: linear-gradient(to right, #7B2FFF, #00F0FF) 1;
    }