/* roulang page: index */
:root {
      --neon-cyan: #00E5FF;
      --neon-purple: #B44CFF;
      --deep-space: #0A0E17;
      --card-bg: rgba(15, 25, 45, 0.65);
      --glass-border: rgba(0, 229, 255, 0.25);
      --text-primary: #EAF0F8;
      --text-secondary: #B0C4DE;
      --text-muted: #7B8BA3;
      --btn-gradient: linear-gradient(135deg, #00E5FF 0%, #00B8D4 100%);
      --shadow-neon: 0 4px 20px rgba(0, 229, 255, 0.2), 0 1px 4px rgba(0, 229, 255, 0.15);
      --border-glow: 1px solid rgba(0, 229, 255, 0.35);
      --radius-card: 14px;
      --radius-engineering: 3px;
      --radius-btn: 8px;
      --font-mono: 'Orbitron', 'Rajdhani', sans-serif;
      --transition-speed: 0.3s;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--deep-space);
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      color: var(--text-secondary);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
      background-image: 
        linear-gradient(rgba(0, 229, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 255, 0.02) 1px, transparent 1px);
      background-size: 40px 40px;
    }

    h1, h2, h3, h4, .font-mono {
      font-family: var(--font-mono);
      letter-spacing: -0.01em;
    }

    h1 {
      font-size: 3.6rem;
      font-weight: 700;
      background: linear-gradient(135deg, #00E5FF 0%, #B44CFF 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.2;
    }

    h2 {
      font-size: 2.4rem;
      font-weight: 600;
      color: var(--text-primary);
      position: relative;
      margin-bottom: 1.5rem;
    }
    h2::after {
      content: '';
      display: block;
      width: 48px;
      height: 3px;
      background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
      margin-top: 0.5rem;
      border-radius: 4px;
    }

    .text-neon { color: var(--neon-cyan); }
    .bg-deep { background-color: var(--deep-space); }
    .glass-panel {
      background: var(--card-bg);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-neon);
    }

    .btn-primary-geek {
      background: var(--btn-gradient);
      border: none;
      color: #0A0E17;
      font-weight: 600;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      transition: all var(--transition-speed) ease;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      box-shadow: 0 0 15px rgba(0, 229, 255, 0.5);
    }
    .btn-primary-geek:hover {
      background: linear-gradient(135deg, #33EAFF 0%, #00C6DD 100%);
      box-shadow: 0 0 25px rgba(0, 229, 255, 0.8);
      transform: translateY(-2px);
      color: #0A0E17;
    }
    .btn-outline-geek {
      background: transparent;
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: all var(--transition-speed) ease;
    }
    .btn-outline-geek:hover {
      background: rgba(180, 76, 255, 0.15);
      border-color: var(--neon-purple);
      color: #fff;
      box-shadow: 0 0 18px rgba(180, 76, 255, 0.5);
    }

    /* 导航杂志风格 */
    .navbar-geek {
      background: rgba(8, 12, 20, 0.85);
      backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.2);
    }
    .brand-text {
      font-family: var(--font-mono);
      font-weight: 700;
      font-size: 1.8rem;
      background: linear-gradient(135deg, #00E5FF, #B44CFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .channel-nav .nav-link {
      color: #A0B5CC;
      font-weight: 500;
      padding: 0.5rem 1.2rem;
      position: relative;
      transition: 0.2s;
    }
    .channel-nav .nav-link:hover,
    .channel-nav .nav-link.active {
      color: var(--neon-cyan);
      text-shadow: 0 0 8px rgba(0,229,255,0.4);
    }
    .channel-nav .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 1.2rem;
      right: 1.2rem;
      height: 2px;
      background: var(--neon-cyan);
      transform: scaleX(0);
      transition: 0.25s;
      box-shadow: 0 0 12px var(--neon-cyan);
    }
    .channel-nav .nav-link:hover::after,
    .channel-nav .nav-link.active::after {
      transform: scaleX(1);
    }

    .hero-image-wrapper {
      border-radius: 20px;
      border: 1px solid rgba(0, 229, 255, 0.45);
      box-shadow: 0 0 35px rgba(0, 229, 255, 0.3);
      overflow: hidden;
      transition: 0.4s;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.5rem;
      color: var(--neon-cyan);
      line-height: 1.2;
    }

    .grid-card {
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(0, 229, 255, 0.25);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .grid-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 4px;
      height: 100%;
      background: linear-gradient(180deg, var(--neon-cyan), var(--neon-purple));
    }
    .grid-card:hover {
      transform: translateY(-5px);
      background: rgba(20, 35, 55, 0.75);
      border-color: rgba(0, 229, 255, 0.5);
      box-shadow: 0 8px 28px rgba(0, 229, 255, 0.25);
    }

    .case-card {
      background: #0D111A;
      border-radius: var(--radius-engineering);
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.08);
      transition: 0.3s;
    }
    .case-card:hover {
      border-color: rgba(0,229,255,0.4);
      box-shadow: 0 8px 22px rgba(0,0,0,0.8);
    }
    .case-card img {
      transition: 0.4s ease;
    }
    .case-card:hover img {
      transform: scale(1.04);
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.07);
      padding: 1rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 0.8rem;
    }
    .faq-answer {
      color: #B0C4DE;
      padding-left: 2.2rem;
      margin-top: 0.5rem;
    }

    footer {
      background: #06090F;
      border-top: 1px solid rgba(0,229,255,0.15);
    }

    @media (max-width: 992px) {
      h1 { font-size: 2.6rem; }
      h2 { font-size: 2rem; }
      .channel-nav { flex-wrap: nowrap; overflow-x: auto; }
    }