:root {
  --bg: #f6f5ef;
  --bg-alt: #eae9e3;
  --text: #050505;
  --text-muted: #555;
  --accent: rgba(243, 112, 33, 0.8);
  --accent-light: rgba(243, 112, 33, 0.15);
  --border: #d4d3cd;
  --grid: #ddd;
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --content-width: 750px;
  --color-blue: #3b4cc0;
  --color-red: #b40426;
  --color-orange: #F37021;
  --color-green: #2ca02c;
  --color-success: #2ca02c;
  --color-danger: #b40426;
}

.dark {
  --bg: #1a1a1a;
  --bg-alt: #252525;
  --text: #e0ddd5;
  --text-muted: #999;
  --accent: rgba(243, 112, 33, 0.9);
  --accent-light: rgba(243, 112, 33, 0.15);
  --border: #3a3a3a;
  --grid: #333;
  --color-blue: #6b8de3;
  --color-red: #e05252;
  --color-orange: #F37021;
  --color-green: #4caf50;
  --color-success: #4caf50;
  --color-danger: #e05252;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 18px;
  /* scroll-behavior set dynamically: instant on load, smooth after settling */
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* Header */
.post-header {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.post-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.post-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  font-style: italic;
  margin: 0.5rem 0 1.25rem;
  line-height: 1.5;
}

.post-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.post-meta a {
  color: var(--accent);
  text-decoration: none;
}

/* Dark mode toggle */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  transition: background 0.3s;
}

.theme-toggle:hover {
  background: var(--accent-light);
}

/* Sections */
section {
  margin-bottom: 3rem;
}

h2 {
  font-size: 1.6rem;
  font-weight: 600;
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 1.5rem 0 0.75rem;
}

p {
  margin: 0 0 1rem;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  text-decoration-thickness: 2px;
}

/* Big stat callouts */
.stat-row {
  display: flex;
  gap: 1rem;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}

.stat-card {
  flex: 1;
  min-width: 140px;
  background: var(--bg-alt);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

thead th {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 2px solid var(--accent);
  font-weight: 600;
  white-space: nowrap;
}

tbody td {
  padding: 0.4rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

tbody tr:hover {
  background: var(--accent-light);
}

td.num, th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-alt);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

/* Inline dice faces */
.die-char {
  font-size: 1.5em;
  vertical-align: baseline;
  line-height: 1;
}

/* Code cards (pseudocode + source) */
.code-card {
  margin: 1.25rem 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: visible;
  font-size: 0.72rem;
  line-height: 1;
}

.code-card-header {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0.25rem 0.6rem;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.code-card pre {
  margin: 0;
  padding: 0.3rem 0;
  background: var(--bg-alt);
  border-radius: 0;
  line-height: 1;
  overflow: visible;
}

.code-card code {
  background: none;
  padding: 0;
  font-size: inherit;
  line-height: 1;
  display: block;
}

.code-line {
  display: block;
  line-height: 1.35;
  padding: 0 0.5rem 0 0;
  transition: background 0.1s;
}

.code-line:hover {
  background: rgba(200, 140, 40, 0.12);
}

.dark .code-line:hover {
  background: rgba(220, 170, 60, 0.15);
}

.code-ln {
  display: inline-block;
  width: 2.2ch;
  margin-right: 0.6ch;
  padding: 0 0.4ch 0 0.4ch;
  text-align: right;
  border-right: 1px solid rgba(0, 0, 0, 0.12);
  color: var(--text-muted);
  user-select: none;
  font-size: 0.85em;
  opacity: 0.6;
}

.dark .code-ln {
  border-right-color: rgba(255, 255, 255, 0.1);
}

/* Blockquotes */
blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  font-style: italic;
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* Footnotes / asides */
.aside {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 1rem 0;
  padding-left: 1rem;
  border-left: 2px solid var(--border);
}

/* Section dividers */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 3rem 0;
}

/* ToC */
.toc {
  background: var(--bg-alt);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
}

.toc h3 {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.toc ol {
  margin: 0;
  padding-left: 1.25rem;
}

.toc li {
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
}

.toc a {
  color: var(--text);
  text-decoration: none;
}

.toc a:hover {
  color: var(--accent);
}

/* Concept terms */
.concept {
  text-decoration: underline;
  text-decoration-style: dotted;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
  cursor: pointer;
  transition: background 0.15s;
}

.concept:hover {
  background: var(--accent-light);
  border-radius: 2px;
}

.concept.active {
  background: var(--accent-light);
  border-radius: 2px;
}

/* Concept drawer */
.concept-drawer {
  position: fixed;
  right: 0;
  top: 36px;
  width: 380px;
  height: calc(100vh - 36px);
  background: var(--bg);
  border-left: 1px solid var(--border);
  z-index: 200;
  transform: translateX(100%);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.08);
}

.dark .concept-drawer {
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.3);
}

.concept-drawer.open {
  transform: translateX(0);
}

.concept-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.concept-drawer-title {
  font-weight: 600;
  font-size: 1.1rem;
}

.concept-drawer-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0 0.25rem;
  line-height: 1;
}

.concept-drawer-close:hover {
  color: var(--accent);
}

.concept-drawer-body {
  overflow-y: auto;
  padding: 1.25rem;
  flex: 1;
  font-size: 0.9rem;
  line-height: 1.6;
}

.concept-drawer-body h2 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}

.concept-drawer-body h3 {
  font-size: 1rem;
  margin: 1.25rem 0 0.5rem;
}

.concept-drawer-body p {
  margin: 0 0 0.75rem;
}

.concept-drawer-body ul,
.concept-drawer-body ol {
  padding-left: 1.25rem;
  margin: 0 0 0.75rem;
}

.concept-drawer-body li {
  margin-bottom: 0.3rem;
}

.concept-drawer-body blockquote {
  margin: 0.75rem 0;
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
}

.concept-drawer-body table {
  font-size: 0.8rem;
  margin: 0.75rem 0;
}

.concept-drawer-body code {
  font-size: 0.8em;
}

.concept-drawer-backdrop {
  display: none;
}

/* Responsive */
@media (max-width: 720px) {
  html { font-size: 16px; }
  .post-header h1 { font-size: 1.8rem; }
  .stat-card { min-width: 100px; }
  .stat-value { font-size: 1.5rem; }
  table { font-size: 0.8rem; }
  thead th, tbody td { padding: 0.3rem 0.5rem; }

  .concept-drawer {
    width: 100%;
  }

  .concept-drawer-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 199;
  }

  .concept-drawer-backdrop.open {
    display: block;
  }
}