:root {
  --bg: #0d0d0d;
  --surface: #141414;
  --text: #f3f4f6;
  --muted: #9ca3af;
  --accent: #71d4ff;
  --accent-2: #71d4ff;
  --accent-gold: #f6c453;
  --border: rgba(255, 255, 255, 0.12);
  --max: 980px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.36);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
  scroll-padding-top: 1rem;
}

html,
body {
  margin: 0;
  padding: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(113, 212, 255, 0.13), transparent 26%),
    radial-gradient(circle at 88% 18%, rgba(246, 196, 83, 0.1), transparent 22%),
    linear-gradient(60deg, rgba(113, 212, 255, 0.055) 1px, transparent 1px),
    linear-gradient(120deg, rgba(246, 196, 83, 0.04) 1px, transparent 1px),
    var(--bg);
  background-size: auto, auto, 86px 86px, 86px 86px, auto;
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-2);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1.5rem;
}

.title {
  font-size: clamp(1.75rem, 2.6vw, 2.4rem);
  margin: 0 0 0.4rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.subtitle {
  margin: 0;
  color: var(--muted);
}

.section-head {
  margin-bottom: 1rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}

.card {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.035), transparent 42%),
    var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  box-shadow: 0 14px 42px rgba(0, 0, 0, 0.18);
  transition: transform 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0;
  background:
    radial-gradient(circle at 85% 12%, rgba(113, 212, 255, 0.17), transparent 28%),
    linear-gradient(135deg, transparent 0 46%, rgba(113, 212, 255, 0.16) 46% 47%, transparent 47% 100%),
    linear-gradient(45deg, transparent 0 58%, rgba(246, 196, 83, 0.12) 58% 59%, transparent 59% 100%);
  transition: opacity 220ms ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 58%, var(--accent-gold));
  box-shadow: var(--shadow);
}

.card:hover::before,
.card:focus-within::before {
  opacity: 1;
}

.card:focus-within {
  border-color: color-mix(in srgb, var(--accent) 58%, var(--accent-gold));
}

.card h2,
.card h3 {
  margin-top: 0;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  font-size: 0.8rem;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.025);
}

.tag--language {
  border-color: color-mix(in srgb, var(--accent) 70%, var(--border));
  color: var(--accent);
  background: rgba(113, 212, 255, 0.08);
  font-weight: 800;
  letter-spacing: 0.08em;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.2rem 0 1rem;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  font-size: 0.82rem;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.02);
}

.diagram {
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  background:
    linear-gradient(60deg, rgba(113, 212, 255, 0.04) 1px, transparent 1px),
    linear-gradient(120deg, rgba(246, 196, 83, 0.035) 1px, transparent 1px),
    #0a0a0a;
  background-size: 34px 34px;
}

.metrics {
  width: 100%;
  border-collapse: collapse;
}

.metrics th,
.metrics td {
  border-bottom: 1px solid var(--border);
  text-align: left;
  padding: 0.5rem;
}

.note-content pre {
  overflow-x: auto;
  padding: 0.8rem;
  border-radius: 10px;
  background: #0a0a0a;
  border: 1px solid var(--border);
}

.note-content h2,
.note-content h3,
.note-content h4 {
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
}

.note-content ul,
.note-content ol {
  margin: 0.8rem 0 1rem 1.25rem;
  padding: 0;
}

.note-content ul {
  list-style: disc;
}

.note-content ol {
  list-style: decimal;
}

.note-content li {
  margin-bottom: 0.45rem;
}

.card ul,
.card ol {
  padding-left: 1.25rem;
}

.card li {
  margin-bottom: 0.45rem;
}

.related-section {
  margin-top: 1.5rem;
}

.note-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  color: var(--text);
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
  box-shadow: 0 0 22px rgba(113, 212, 255, 0.16);
}

.btn:focus-visible {
  border-color: var(--accent-gold);
  color: var(--text);
  text-decoration: none;
}

@media (prefers-reduced-motion: reduce) {
  .card,
  .card::before,
  .btn {
    transition: none;
  }

  .card:hover {
    transform: none;
  }
}

.footer {
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  html,
  body {
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
  }

  .page {
    width: auto;
    max-width: none;
    margin: 0;
    padding-inline: 1rem;
    overflow: visible;
  }

  .topbar {
    display: grid;
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }

  .grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .card {
    width: auto;
    max-width: 100%;
    min-width: 0;
    border-radius: 12px;
    overflow-wrap: anywhere;
  }

  .title,
  .subtitle,
  .meta,
  .card p,
  .card li {
    overflow-wrap: anywhere;
  }

  .metrics {
    display: table;
    table-layout: fixed;
    width: 100%;
    max-width: 100%;
    overflow-x: visible;
    white-space: normal;
  }

  .metrics th,
  .metrics td {
    padding: 0.45rem 0.35rem;
    font-size: 0.82rem;
    overflow-wrap: anywhere;
  }

  .diagram {
    max-width: 100%;
  }

  .note-content pre {
    max-width: 100%;
  }

  .tag-row {
    gap: 0.35rem;
  }
}