/* ─── Tokens ───────────────────────────────────────────────── */
:root {
  --color-bg:       #edeae0;
  --color-surface:  #f4f1e8;
  --color-border:   #d9d2c2;
  --color-text:     #1c1a17;
  --color-muted:    #7a7060;
  --color-accent:   #c4725a;
  --color-code-bg:  #e4dfd3;

  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans:  'DM Sans', system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', 'Courier New', monospace;

  --width-prose: 720px;
  --width-toc:   220px;
  --gap-toc:     48px;
}

/* ─── Reset ────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--color-accent); }

img { max-width: 100%; height: auto; display: block; }

/* ─── Layout ───────────────────────────────────────────────── */
.site-header,
.site-main,
.site-footer {
  max-width: calc(var(--width-prose) + var(--gap-toc) + var(--width-toc) + 96px);
  margin: 0 auto;
  padding: 0 48px;
}

/* ─── Nav ──────────────────────────────────────────────────── */
.site-header {
  padding-top: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 56px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-style: italic;
  font-size: 1.75rem;
  text-decoration: none;
  color: var(--color-accent);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 28px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-muted);
  letter-spacing: 0.02em;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--color-text); }
.nav-links a.active { color: var(--color-accent); }

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-muted);
  padding: 2px;
  display: flex;
  align-items: center;
  transition: color 0.15s;
}

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

/* Icon visibility — show moon in light mode, sun in dark mode */
[data-theme="light"] .icon-sun,
[data-theme="dark"]  .icon-moon { display: none; }

/* ─── Footer ───────────────────────────────────────────────── */
.site-footer {
  margin-top: 80px;
  padding-top: 28px;
  padding-bottom: 28px;
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-muted);
}

.site-footer a { color: var(--color-muted); }
.site-footer a:hover { color: var(--color-accent); }

/* ─── Page two-column grid ─────────────────────────────────── */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--width-prose)) var(--width-toc);
  gap: var(--gap-toc);
  align-items: start;
}

@media (max-width: 1100px) {
  .page-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
}

/* ─── Post list (home + list pages) ───────────────────────── */
.post-list { max-width: var(--width-prose); }

.post-item {
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.post-item:first-child { border-top: 1px solid var(--color-border); }

.post-item time {
  display: block;
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}

.post-item a {
  font-size: 1.2rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--color-text);
  line-height: 1.3;
}

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

.post-item p {
  margin-top: 6px;
  font-size: 0.9rem;
  color: var(--color-muted);
  font-family: var(--font-serif);
  font-style: italic;
}

/* ─── List page title ──────────────────────────────────────── */
.list-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 40px;
  color: var(--color-text);
}

/* ─── Prose ─────────────────────────────────────────────────── */
.prose { min-width: 0; }

.post-header { margin-bottom: 48px; }

.post-header h1 {
  font-size: 2.4rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.post-description {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.post-meta {
  font-size: 0.8rem;
  color: var(--color-muted);
}

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

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

/* Featured image */
.post-cover {
  width: 100%;
  border-radius: 6px;
  margin-bottom: 48px;
  border: 1px solid var(--color-border);
}

/* Headings */
.prose h2 {
  font-size: 1.5rem;
  font-weight: 500;
  margin: 48px 0 16px;
  line-height: 1.3;
}

.prose h3 {
  font-size: 1.2rem;
  font-weight: 500;
  margin: 36px 0 12px;
  line-height: 1.3;
}

/* Body */
.prose p { margin-bottom: 20px; }

/* Italic accent — the key typographic move */
.prose em, .prose i {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-accent);
}

/* Bold stays in sans */
.prose strong { font-weight: 600; }

/* Highlight ==text== */
.prose mark {
  background: color-mix(in srgb, var(--color-accent) 18%, transparent);
  color: inherit;
  border-radius: 2px;
  padding: 1px 3px;
}

/* Horizontal rule */
.prose hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 40px 0;
}

/* Blockquote */
.prose blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 4px 0 4px 20px;
  margin: 28px 0;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-muted);
}

.prose blockquote strong {
  font-family: var(--font-sans);
  font-style: normal;
  color: var(--color-text);
}

/* Lists */
.prose ul, .prose ol {
  margin: 0 0 20px 24px;
}

.prose li { margin-bottom: 6px; }

/* Inline code */
.prose code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-code-bg);
  border-radius: 3px;
  padding: 1px 5px;
  color: var(--color-text);
}

/* Code blocks */
.prose pre {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 20px 20px 16px;
  margin: 28px 0;
  overflow-x: auto;
}

.prose pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Code block language label */
.code-lang {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 12px;
}

/* Copy button */
.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 3px 8px;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  color: var(--color-muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
}

.prose pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--color-accent); border-color: var(--color-accent); }
.copy-btn.copied { color: var(--color-accent); opacity: 1; }

/* Tables */
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.9rem;
}

.prose th {
  text-align: left;
  font-weight: 600;
  padding: 8px 12px;
  border-bottom: 2px solid var(--color-border);
}

.prose td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border);
}

/* Images in prose */
.prose img {
  border-radius: 6px;
  margin: 28px 0;
  border: 1px solid var(--color-border);
  cursor: zoom-in;
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 100;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}

.lightbox.open { display: flex; }

.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: 4px;
  object-fit: contain;
  box-shadow: 0 8px 48px rgba(0, 0, 0, 0.6);
  cursor: zoom-out;
}

/* Links in prose */
.prose a { color: var(--color-accent); }
.prose a:hover { color: var(--color-text); }

/* ─── ToC ───────────────────────────────────────────────────── */
.toc {
  position: sticky;
  top: 32px;
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  padding-left: 24px;
  border-left: 1px solid var(--color-border);
}

.toc-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin-bottom: 4px; }

.toc a {
  font-size: 0.8rem;
  color: var(--color-muted);
  text-decoration: none;
  line-height: 1.4;
  display: block;
  transition: color 0.15s;
}

.toc a:hover { color: var(--color-text); }
.toc a.active { color: var(--color-accent); font-weight: 500; }

/* Nested ToC */
.toc ul ul { padding-left: 12px; }

/* ─── Chroma syntax highlight ───────────────────────────────── */
.chroma { background: transparent; }

/* Keywords */
.chroma .k, .chroma .kd, .chroma .kn, .chroma .kr, .chroma .kt { color: #8b5e3c; font-weight: 500; }

/* Strings */
.chroma .s, .chroma .s1, .chroma .s2, .chroma .sb, .chroma .sc, .chroma .dl { color: #5a7a3a; }

/* Comments */
.chroma .c, .chroma .c1, .chroma .cm, .chroma .cs { color: #9a9080; font-style: italic; }

/* Numbers */
.chroma .m, .chroma .mb, .chroma .mf, .chroma .mi, .chroma .mo { color: #7a5ea0; }

/* Function names, built-ins */
.chroma .nf, .chroma .nb { color: #3a6ea0; }

/* Punctuation, operators */
.chroma .p, .chroma .o { color: var(--color-muted); }

/* ─── 404 ───────────────────────────────────────────────────── */
.not-found {
  text-align: center;
  padding: 80px 0;
}

.not-found h1 {
  font-size: 4rem;
  font-weight: 600;
  color: var(--color-accent);
  font-family: var(--font-serif);
  font-style: italic;
  margin-bottom: 16px;
}

.not-found p {
  color: var(--color-muted);
  margin-bottom: 32px;
}

/* ─── Dark mode ─────────────────────────────────────────────── */
[data-theme="dark"] {
  --color-bg:      #131210;
  --color-surface: #1c1a17;
  --color-border:  #2a2620;
  --color-text:    #c0b8a8;
  --color-muted:   #6a6050;
  --color-accent:  #c4725a;
  --color-code-bg: #191714;
}

[data-theme="dark"] .chroma .k,
[data-theme="dark"] .chroma .kd,
[data-theme="dark"] .chroma .kn,
[data-theme="dark"] .chroma .kr,
[data-theme="dark"] .chroma .kt  { color: #d4905a; }

[data-theme="dark"] .chroma .s,
[data-theme="dark"] .chroma .s1,
[data-theme="dark"] .chroma .s2,
[data-theme="dark"] .chroma .sb,
[data-theme="dark"] .chroma .sc,
[data-theme="dark"] .chroma .dl  { color: #8ab870; }

[data-theme="dark"] .chroma .c,
[data-theme="dark"] .chroma .c1,
[data-theme="dark"] .chroma .cm,
[data-theme="dark"] .chroma .cs  { color: #4a4538; font-style: italic; }

[data-theme="dark"] .chroma .m,
[data-theme="dark"] .chroma .mb,
[data-theme="dark"] .chroma .mf,
[data-theme="dark"] .chroma .mi,
[data-theme="dark"] .chroma .mo  { color: #9a80c0; }

[data-theme="dark"] .chroma .nf,
[data-theme="dark"] .chroma .nb  { color: #6090c0; }

[data-theme="dark"] .chroma .p,
[data-theme="dark"] .chroma .o   { color: var(--color-muted); }

/* ─── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
  .site-header,
  .site-main,
  .site-footer { padding: 0 20px; }

  .site-header { padding-top: 20px; padding-bottom: 20px; margin-bottom: 36px; }

  .post-header h1 { font-size: 1.8rem; }
}