/* roulang page: index */
:root {
      --primary-cyan: #00F0FF;
      --secondary-purple: #BD00FF;
      --accent-red: #FF003C;
      --bg-deep: #0A0A0F;
      --bg-card: #14141F;
      --text-body: #E0E0E0;
      --text-muted: #8888AA;
      --text-white: #FFFFFF;
      --border-glow: rgba(0,240,255,0.15);
      --border-purple: rgba(189,0,255,0.2);
      --shadow-cyan: 0 4px 24px rgba(0,240,255,0.08);
      --shadow-hover: 0 8px 32px rgba(0,240,255,0.2);
      --radius: 8px;
      --radius-pill: 20px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      background-image: radial-gradient(circle at 25% 25%, rgba(0,240,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    .grid-container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-sans);
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 1rem;
    }
    h1 {
      font-size: 3rem;
      letter-spacing: 1px;
    }
    h2 {
      font-size: 2.25rem;
      margin-bottom: 2.5rem;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -10px;
      width: 60px;
      height: 3px;
      background: var(--primary-cyan);
      box-shadow: 0 0 12px var(--primary-cyan);
    }
    h3 {
      font-size: 1.5rem;
      color: var(--text-white);
    }
    a {
      color: var(--primary-cyan);
      text-decoration: none;
      transition: color var(--transition);
    }
    a:hover {
      color: #00D4E0;
    }
    button, .button {
      font-family: var(--font-sans);
      cursor: pointer;
      border-radius: 6px;
      font-weight: 600;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      min-height: 44px;
      padding: 0 24px;
    }
    .btn-primary {
      background: var(--primary-cyan);
      color: var(--bg-deep);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }
    .btn-primary:hover {
      background: #00D4E0;
      box-shadow: 0 0 20px rgba(0,240,255,0.5);
      color: var(--bg-deep);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--primary-cyan);
      color: var(--primary-cyan);
    }
    .btn-secondary:hover {
      background: rgba(0,240,255,0.1);
      border-color: var(--primary-cyan);
    }
    .btn-accent {
      background: var(--accent-red);
      color: #FFFFFF;
      box-shadow: 0 0 16px rgba(255,0,60,0.3);
    }
    .btn-accent:hover {
      background: #E00035;
      box-shadow: 0 0 24px rgba(255,0,60,0.5);
    }
    .header-sticky {
      position: sticky;
      top: 0;
      z-index: 40;
      background: var(--bg-deep);
      border-bottom: 1px solid var(--primary-cyan);
      box-shadow: 0 2px 12px rgba(0,240,255,0.1);
    }
    .nav-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
    }
    .logo-text {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-cyan);
      text-shadow: 0 0 10px var(--primary-cyan);
      letter-spacing: 2px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      display: inline-block;
      width: 28px;
      height: 28px;
      background: var(--primary-cyan);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><rect x="2" y="2" width="8" height="8" fill="white"/><rect x="14" y="2" width="8" height="8" fill="white"/><rect x="2" y="14" width="8" height="8" fill="white"/><rect x="14" y="14" width="8" height="8" fill="white"/></svg>') no-repeat center;
      mask-size: contain;
      background-color: var(--primary-cyan);
    }
    .search-icon {
      background: none;
      border: none;
      color: var(--primary-cyan);
      font-size: 1.4rem;
      margin-right: 16px;
      cursor: pointer;
    }
    .channel-tabs {
      display: flex;
      gap: 24px;
      padding: 8px 0 12px;
      overflow-x: auto;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: thin;
      scrollbar-color: var(--primary-cyan) var(--bg-card);
    }
    .channel-tabs a {
      color: var(--text-muted);
      font-weight: 600;
      font-size: 0.95rem;
      padding-bottom: 6px;
      border-bottom: 2px solid transparent;
      transition: all var(--transition);
    }
    .channel-tabs a:hover, .channel-tabs a.active {
      color: var(--primary-cyan);
      border-bottom-color: var(--primary-cyan);
      text-shadow: 0 0 6px var(--primary-cyan);
    }
    .hero-section {
      min-height: 90vh;
      background: linear-gradient(135deg, rgba(10,10,15,0.85) 0%, rgba(20,20,31,0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      max-width: 700px;
      position: relative;
      z-index: 2;
    }
    .hero h1 {
      text-shadow: 0 0 20px rgba(0,240,255,0.6);
      margin-bottom: 1.2rem;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-body);
      margin-bottom: 2rem;
    }
    .circuit-decor {
      position: absolute;
      right: 40px;
      bottom: 40px;
      width: 180px;
      height: 180px;
      opacity: 0.25;
      background: radial-gradient(circle at 20% 30%, var(--primary-cyan) 2px, transparent 2px),
                  linear-gradient(90deg, transparent 49%, var(--primary-cyan) 49%, var(--primary-cyan) 51%, transparent 51%),
                  linear-gradient(0deg, transparent 49%, var(--primary-cyan) 49%, var(--primary-cyan) 51%, transparent 51%);
      background-size: 20px 20px, 100% 4px, 4px 100%;
      background-position: 0 0, 0 50%, 50% 0;
      transform: rotate(15deg);
    }
    .stats-dashboard {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      margin: 60px 0;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-cyan);
      text-shadow: 0 0 12px var(--primary-cyan);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 1rem;
      letter-spacing: 1px;
    }
    .feature-row {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 80px;
    }
    .feature-img {
      flex: 1;
      background: #1A1A2E;
      border-radius: var(--radius);
      border: 1px solid var(--border-glow);
      overflow: hidden;
    }
    .feature-img img {
      width: 100%;
      height: auto;
      display: block;
    }
    .feature-text {
      flex: 1;
    }
    .tech-tag {
      display: inline-block;
      background: rgba(0,240,255,0.1);
      color: var(--primary-cyan);
      font-family: var(--font-mono);
      font-size: 0.8rem;
      padding: 4px 10px;
      border-radius: 4px;
      margin-right: 8px;
      margin-top: 8px;
    }
    .scroll-cards {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: thin;
      scrollbar-color: var(--primary-cyan) var(--bg-card);
    }
    .scene-card {
      min-width: 280px;
      background: var(--bg-card);
      border-radius: var(--radius);
      border: 1px solid var(--border-glow);
      transition: all var(--transition);
      flex-shrink: 0;
    }
    .scene-card:hover {
      border-color: var(--primary-cyan);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .scene-card img {
      width: 100%;
      height: 160px;
      object-fit: cover;
      border-radius: var(--radius) var(--radius) 0 0;
    }
    .scene-card h4 {
      margin: 16px 16px 4px;
    }
    .scene-card p {
      margin: 0 16px 16px;
      color: var(--text-muted);
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--bg-card);
      border: 1px solid var(--border-purple);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      box-shadow: 0 4px 16px rgba(189,0,255,0.06);
    }
    .case-logo {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      border: 2px solid var(--secondary-purple);
      margin: 0 auto 16px;
      background: #1A1A2E;
    }
    .case-quote {
      font-style: italic;
      color: var(--text-body);
      margin-bottom: 12px;
    }
    .case-highlight {
      font-family: var(--font-mono);
      font-size: 1.8rem;
      color: var(--primary-cyan);
      text-shadow: 0 0 8px var(--primary-cyan);
    }
    .pricing-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .pricing-card {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius);
      padding: 32px 24px;
      flex: 1;
      min-width: 260px;
      max-width: 320px;
      text-align: center;
      position: relative;
    }
    .pricing-card.popular {
      border: 2px solid var(--primary-cyan);
      box-shadow: 0 0 20px rgba(0,240,255,0.15);
    }
    .popular-badge {
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--accent-red);
      color: white;
      padding: 4px 20px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
    }
    .price {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      color: var(--text-white);
      margin: 20px 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-glow);
      margin-bottom: 8px;
    }
    .faq-question {
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      padding: 18px 8px;
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-white);
      display: flex;
      align-items: center;
      gap: 10px;
      cursor: pointer;
      transition: color var(--transition);
    }
    .faq-question:hover {
      color: var(--primary-cyan);
    }
    .faq-icon {
      color: var(--primary-cyan);
      transition: transform 0.4s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: rgba(0,240,255,0.03);
      padding: 0 16px;
      color: var(--text-body);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(90deg);
    }
    .cta-bottom {
      background: var(--bg-deep);
      border-top: 1px solid var(--primary-cyan);
      border-bottom: 1px solid var(--primary-cyan);
      padding: 64px 0;
      text-align: center;
    }
    .footer {
      background: var(--bg-deep);
      border-top: 1px solid var(--primary-cyan);
      padding: 48px 0 24px;
    }
    .footer a {
      color: var(--text-muted);
    }
    .footer a:hover {
      color: var(--primary-cyan);
    }
    .social-icons svg {
      fill: var(--text-muted);
      width: 24px;
      height: 24px;
      margin-right: 16px;
      transition: fill var(--transition);
    }
    .social-icons svg:hover {
      fill: var(--primary-cyan);
    }
    @media (max-width: 1024px) {
      .feature-row {
        flex-direction: column;
      }
      .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
      .channel-tabs {
        gap: 16px;
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
      .pricing-grid {
        flex-direction: column;
        align-items: center;
      }
      .nav-row {
        flex-wrap: wrap;
      }
      .hamburger {
        display: block;
        background: none;
        border: none;
        color: var(--primary-cyan);
        font-size: 1.8rem;
      }
    }
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: var(--bg-card);
      padding: 16px;
      border-radius: var(--radius);
    }
    .mobile-menu a {
      padding: 12px 0;
      border-bottom: 1px solid var(--border-glow);
    }