:root {
  color-scheme: dark;
  --bg: #070a12;
  --panel: rgba(13, 18, 32, 0.88);
  --panel-strong: rgba(18, 25, 43, 0.96);
  --border: rgba(148, 163, 184, 0.22);
  --border-strong: rgba(125, 211, 252, 0.55);
  --text: #e5edf7;
  --muted: #94a3b8;
  --muted-2: #64748b;
  --accent: #38bdf8;
  --accent-2: #a78bfa;
  --surface: rgba(15, 23, 42, 0.78);
  --surface-hover: rgba(30, 41, 59, 0.86);
  --code-bg: #020617;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  --radius: 24px;
  --sidebar-width: 320px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 32rem),
    radial-gradient(circle at bottom right, rgba(167, 139, 250, 0.13), transparent 30rem),
    linear-gradient(135deg, #050816 0%, #08111f 45%, #020617 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.12) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, black, transparent 72%);
}

.site-shell {
  position: relative;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  gap: 0;
  width: min(1480px, calc(100vw - 48px));
  min-height: calc(100vh - 48px);
  margin: 24px auto;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(2, 6, 23, 0.48);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.sidebar {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 28px 22px;
  border-right: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.94), rgba(2, 6, 23, 0.88));
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}

.brand-mark {
  display: inline-grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  color: var(--accent);
  background: rgba(56, 189, 248, 0.1);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-weight: 700;
}

.brand h1 {
  margin: 0;
  font-size: 1.55rem;
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.brand p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.project-nav {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding-top: 28px;
}

.nav-home,
.nav-group h2 {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-group h2 {
  margin: 0 0 10px;
  color: var(--text);
}

.nav-group ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 9px 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  color: var(--muted);
  text-decoration: none;
  transition: 160ms ease;
}

.nav-group .nav-link {
  margin-left: 10px;
  padding-left: 18px;
  position: relative;
}

.nav-group .nav-link::before {
  content: "";
  width: 6px;
  height: 6px;
  margin-right: 10px;
  border-radius: 999px;
  background: var(--muted-2);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--text);
  border-color: var(--border);
  background: var(--surface-hover);
  outline: none;
}

.nav-link.active {
  color: #e0f2fe;
  border-color: rgba(56, 189, 248, 0.36);
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.18), rgba(167, 139, 250, 0.1));
}

.nav-link.active::before {
  background: var(--accent);
}

.nav-section {
  display: grid;
  gap: 14px;
}

.nav-section-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid rgba(125, 211, 252, 0.24);
  border-radius: 14px;
  color: var(--text);
  background: rgba(56, 189, 248, 0.06);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-align: left;
  text-transform: uppercase;
  cursor: pointer;
  transition: 160ms ease;
}

.nav-section-toggle:hover,
.nav-section-toggle:focus-visible {
  border-color: var(--border-strong);
  background: rgba(56, 189, 248, 0.11);
  outline: none;
}

.nav-section-icon {
  color: var(--accent);
  font-size: 0.9rem;
  transition: transform 160ms ease;
}

.nav-section:not(.is-open) .nav-section-icon {
  transform: rotate(-90deg);
}

.nav-section-content {
  display: grid;
  gap: 22px;
  padding: 14px 0 0 14px;
  border-left: 1px solid var(--border);
}

.nav-section:not(.is-open) .nav-section-content {
  display: none;
}

.content-panel {
  min-width: 0;
  padding: 30px;
  background: rgba(2, 6, 23, 0.28);
}

.content-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 26px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel);
}

.eyebrow {
  display: block;
  margin-bottom: 5px;
  color: var(--accent);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.content-toolbar h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2vw, 2rem);
  letter-spacing: -0.04em;
}

.source-link {
  flex: 0 0 auto;
  padding: 10px 14px;
  border: 1px solid rgba(56, 189, 248, 0.34);
  border-radius: 999px;
  color: #bae6fd;
  background: rgba(56, 189, 248, 0.08);
  text-decoration: none;
  font-size: 0.9rem;
}

.source-link:hover,
.source-link:focus-visible {
  border-color: rgba(56, 189, 248, 0.72);
  outline: none;
}

.markdown-content {
  min-height: calc(100vh - 200px);
  padding: clamp(24px, 4vw, 52px);
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--panel-strong);
  line-height: 1.72;
}

.markdown-content > :first-child {
  margin-top: 0;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3 {
  line-height: 1.2;
  letter-spacing: -0.04em;
}

.markdown-content h1 {
  margin: 0 0 22px;
  font-size: clamp(2rem, 4vw, 3.6rem);
}

.markdown-content h2 {
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: clamp(1.45rem, 2.4vw, 2.1rem);
}

.markdown-content h3 {
  margin-top: 30px;
  font-size: 1.22rem;
}

.markdown-content p,
.markdown-content li {
  color: #cbd5e1;
}

.markdown-content a {
  color: #7dd3fc;
  text-underline-offset: 4px;
}

.markdown-content code {
  padding: 0.17em 0.38em;
  border: 1px solid rgba(148, 163, 184, 0.16);
  border-radius: 7px;
  color: #bfdbfe;
  background: var(--code-bg);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.markdown-content pre {
  overflow: auto;
  padding: 18px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 16px;
  background: var(--code-bg);
}

.markdown-content pre code {
  padding: 0;
  border: 0;
  background: transparent;
}

.markdown-content blockquote {
  margin: 28px 0;
  padding: 18px 22px;
  border-left: 4px solid var(--accent);
  border-radius: 0 14px 14px 0;
  background: rgba(56, 189, 248, 0.08);
}

.markdown-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.markdown-content th,
.markdown-content td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

.markdown-content th {
  color: var(--text);
  background: rgba(15, 23, 42, 0.95);
}

.empty-state,
.error-state {
  display: grid;
  min-height: 360px;
  place-items: center;
  color: var(--muted);
  text-align: center;
}

.error-state {
  color: #fecaca;
}

@media (max-width: 860px) {
  .site-shell {
    grid-template-columns: 1fr;
    width: min(100vw - 24px, 760px);
    margin: 12px auto;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .project-nav {
    gap: 16px;
  }

  .content-panel {
    padding: 18px;
  }

  .content-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .markdown-content {
    min-height: 420px;
  }
}