:root {
    --bg: #0f1113;
    --bg-body: #ffffff;
    --panel: #1e1e1e;
    --panel-2: #2b2b2b;
    --muted: #ffffff;
    --accent: #0ea5a4;
    --code-font: "Consolas", "Courier New", monospace;
    --ui-font: Ginto, ui-serif, system-ui, sans-serif;
    --radius: 10px;
  }

  html, body {
    height: 100%;
    margin: 0;
    background: var(--bg-body);
    color: #0b1220;
    font-family: var(--ui-font);
    font-size: 14px;
    line-height: 1.45;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  /* Header */
  header.site-header {
    background: var(--panel);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    position: sticky;
    top: 0;
    z-index: 1000;
  }

  .navbar-brand {
    font-weight: 700;
    letter-spacing: 0.2px;
    color: #fff;
  }

  .nav-link {
    color: var(--muted);
    transition: color 0.15s ease;
  }
  .nav-link:hover { color: #fff; }

  /* Hero */
  .hero {
    padding: 56px 16px;
    text-align: center;
    background: var(--panel-2);
  }
  .hero h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
    color: #fff;
  }
  .hero p {
    color: var(--muted);
    max-width: 900px;
    margin: 0 auto;
  }

  /* Content Container */
  .content {
    max-width: 1100px;
    margin: 32px auto;
    padding: 0 16px 48px;
  }

  /* Code Card */
  .code-card {
    background: var(--panel);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 20px;
    border: 1px solid rgba(255, 255, 255, 0.03);
    box-shadow: 0 6px 18px rgba(2, 6, 23, 0.6);
  }

  .code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 12px;
    background: linear-gradient(90deg, var(--panel-2), rgba(255, 255, 255, 0.02));
  }

  .code-header-left {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .lang-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 64px;
    padding: 6px 10px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
    color: #fff;
    font-weight: 600;
    font-size: 13px;
  }
  .lang-badge small {
    color: var(--muted);
    font-weight: 500;
  }

  .collapse-toggle,
  .copy-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 36px;
    height: 36px;
    padding: 6px 10px;
    border-radius: 8px;
    background: transparent;
    color: #dfe7ee;
    border: 1px solid rgba(255, 255, 255, 0.03);
    transition: background 0.15s ease;
  }
  .collapse-toggle:hover,
  .copy-btn:hover {
    background: rgba(255, 255, 255, 0.02);
  }

  pre {
    margin: 0;
    padding: 16px;
    background: #0b0b0b;
    color: #e6eef6;
    font-family: var(--code-font);
    font-size: 14px;
    overflow: auto;
    white-space: pre;
  }

  /* Footer */
  footer.site-footer {
    background: var(--panel);
    color: var(--muted);
    padding: 28px 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
  }
  footer .legal a {
    color: var(--muted);
    text-decoration: none;
    margin-left: 12px;
  }
  footer .legal a:hover { color: #fff; }

  /* Responsive */
  @media (max-width: 767px) {
    .hero h1 { font-size: 1.6rem; }
    .code-header { padding: 8px; }
    .lang-badge { padding: 6px 8px; font-size: 12px; min-width: 56px; }
    .collapse-toggle, .copy-btn { width: 36px; height: 36px; padding: 6px; }
    pre { padding: 12px; font-size: 13px; }
  }

  /* Focus outline */
  button:focus {
    outline: 2px solid rgba(14, 165, 164, 0.18);
    outline-offset: 2px;
  }

  /* Navbar toggler icon */
  .navbar-toggler-icon {
    width: 1.5em;
    height: 1.5em;
    display: inline-block;
    vertical-align: middle;
    background-color: #ffffff;
    background-repeat: no-repeat;
    -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'><path d='M4 7h22v2H4zM4 14h22v2H4zM4 21h22v2H4z'/></svg>") center / 100% no-repeat;
    mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'><path d='M4 7h22v2H4zM4 14h22v2H4zM4 21h22v2H4z'/></svg>") center / 100% no-repeat;
  }