/* Placeholder — will be fleshed out in styling task */
:root {
  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, monospace;
  --c-bg: #ffffff;
  --c-text: #1e293b;
  --c-text-muted: #64748b;
  --c-border: #e2e8f0;
  --c-accent: #2563eb;
  --c-accent-light: #dbeafe;
  --c-code-bg: #f8fafc;
  --c-nav-bg: #f1f5f9;
  --max-width: 1200px;
  --sidebar-width: 220px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --c-bg: #0f172a;
    --c-text: #e2e8f0;
    --c-text-muted: #94a3b8;
    --c-border: #334155;
    --c-accent: #60a5fa;
    --c-accent-light: #1e3a5f;
    --c-code-bg: #1e293b;
    --c-nav-bg: #1e293b;
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.6;
}

.site-layout {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  border-bottom: 1px solid var(--c-border);
  background: var(--c-bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--c-accent);
  text-decoration: none;
  font-family: var(--font-mono);
}

.site-tagline {
  color: var(--c-text-muted);
  font-size: 0.85rem;
}

.menu-toggle {
  display: none;
  cursor: pointer;
  font-size: 1.5rem;
  margin-left: auto;
}

.site-body {
  display: flex;
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

.site-nav {
  width: var(--sidebar-width);
  padding: 16px;
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  gap: 2px;
  position: sticky;
  top: 52px;
  height: calc(100vh - 52px);
  overflow-y: auto;
  flex-shrink: 0;
}

.nav-link {
  display: block;
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--c-text);
  text-decoration: none;
  font-size: 0.875rem;
}

.nav-link:hover {
  background: var(--c-accent-light);
  color: var(--c-accent);
}

.site-content {
  flex: 1;
  padding: 32px 40px;
  min-width: 0;
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

/* Prose styles for rendered markdown */
.prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--c-border);
}

.prose h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.prose p {
  margin-bottom: 1rem;
}

.prose ul, .prose ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.prose li {
  margin-bottom: 0.25rem;
}

.prose a {
  color: var(--c-accent);
  text-decoration: none;
}

.prose a:hover {
  text-decoration: underline;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--c-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
}

.prose pre {
  margin-bottom: 1rem;
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.5;
  background: var(--c-code-bg);
  border: 1px solid var(--c-border);
}

.prose pre code {
  background: none;
  padding: 0;
  border-radius: 0;
}

/* Shiki dual-theme support */
.shiki,
.shiki span {
  color: var(--shiki-light) !important;
  background-color: transparent !important;
}

@media (prefers-color-scheme: dark) {
  .shiki,
  .shiki span {
    color: var(--shiki-dark) !important;
  }
}

.prose table {
  width: 100%;
  margin-bottom: 1rem;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.prose th, .prose td {
  padding: 8px 12px;
  border: 1px solid var(--c-border);
  text-align: left;
}

.prose th {
  font-weight: 600;
  background: var(--c-nav-bg);
}

.prose strong {
  font-weight: 600;
}

.prose blockquote {
  border-left: 3px solid var(--c-accent);
  padding-left: 16px;
  margin-bottom: 1rem;
  color: var(--c-text-muted);
}

.site-footer {
  padding: 24px;
  border-top: 1px solid var(--c-border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--c-text-muted);
}

.site-footer a {
  color: var(--c-accent);
  text-decoration: none;
}

/* Mobile responsive */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 52px;
    left: 0;
    width: 260px;
    height: calc(100vh - 52px);
    background: var(--c-bg);
    border-right: 1px solid var(--c-border);
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    z-index: 20;
  }

  .site-nav.open {
    transform: translateX(0);
  }

  .site-content {
    padding: 24px 16px;
  }

  .page-title {
    font-size: 1.5rem;
  }
}