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

:root {
  --bg: #f6f1e6;
  --bg-accent: #efe6d3;
  --paper-shadow: rgba(98, 77, 44, 0.08);
  --toggle-track: #eadfca;
  --toggle-track-hover: #e3d5bc;
  --toggle-knob: #8c5a2b;
  --toggle-sun: rgba(140, 90, 43, 0.4);
  --toggle-moon: rgba(111, 98, 83, 0.28);
  --page-texture:
    radial-gradient(circle at top, rgba(255, 252, 245, 0.9), transparent 50%),
    linear-gradient(180deg, rgba(140, 90, 43, 0.03), transparent 22%),
    repeating-linear-gradient(0deg, transparent 0, transparent 31px, rgba(111, 98, 83, 0.035) 32px);
  --quote-bg: rgba(251, 247, 239, 0.75);
  --fg: #2a241c;
  --muted: #6f6253;
  --accent: #8c5a2b;
  --border: #d9ccb8;
  --surface: #fbf7ef;
  --surface-hover: #f4ecde;
  --max-width: 680px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

:root[data-theme="dark"] {
  --bg: #111315;
  --bg-accent: #1a1d20;
  --paper-shadow: rgba(0, 0, 0, 0);
  --toggle-track: #202429;
  --toggle-track-hover: #2a3036;
  --toggle-knob: #f3f4f6;
  --toggle-sun: rgba(125, 211, 252, 0.16);
  --toggle-moon: rgba(243, 244, 246, 0.42);
  --page-texture: none;
  --quote-bg: rgba(26, 29, 32, 0.7);
  --fg: #f3f4f6;
  --muted: #a1a1aa;
  --accent: #7dd3fc;
  --border: #2a2f33;
  --surface: #1a1d20;
  --surface-hover: #24282d;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111315;
    --bg-accent: #1a1d20;
    --paper-shadow: rgba(0, 0, 0, 0);
    --toggle-track: #202429;
    --toggle-track-hover: #2a3036;
    --toggle-knob: #f3f4f6;
    --toggle-sun: rgba(125, 211, 252, 0.16);
    --toggle-moon: rgba(243, 244, 246, 0.42);
    --page-texture: none;
    --quote-bg: rgba(26, 29, 32, 0.7);
    --fg: #f3f4f6;
    --muted: #a1a1aa;
    --accent: #7dd3fc;
    --border: #2a2f33;
    --surface: #1a1d20;
    --surface-hover: #24282d;
  }
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  background-image: var(--page-texture);
  color: var(--fg);
  line-height: 1.7;
  font-size: 1rem;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* Layout */
.site-header, main, .site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header { padding-top: 2rem; padding-bottom: 2rem; }
main { padding-top: 2rem; padding-bottom: 4rem; min-height: calc(100vh - 160px); }
.site-footer { padding-top: 2rem; padding-bottom: 2rem; border-top: 1px solid var(--border); }

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--fg);
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.nav-links a:hover { color: var(--fg); }

.theme-toggle {
  position: relative;
  width: 2.5rem;
  height: 1.4rem;
  border: 1px solid var(--border);
  background: var(--toggle-track);
  border-radius: 999px;
  padding: 0;
  font: inherit;
  cursor: pointer;
  appearance: none;
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

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

.theme-toggle::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0.16rem;
  width: 0.88rem;
  height: 0.88rem;
  border-radius: 50%;
  background: var(--toggle-knob);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.16);
  transform: translateY(-50%);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.theme-toggle::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 0.52rem 50%, var(--toggle-sun) 0 0.13rem, transparent 0.14rem),
    radial-gradient(circle at calc(100% - 0.5rem) 50%, var(--toggle-moon) 0 0.14rem, transparent 0.15rem),
    radial-gradient(circle at calc(100% - 0.43rem) 50%, var(--toggle-track) 0 0.1rem, transparent 0.11rem);
}

.theme-toggle[aria-checked="true"]::before {
  transform: translate(1.08rem, -50%);
}

.theme-toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}

/* Typography */
h1, h2, h3, h4 {
  line-height: 1.3;
  margin-bottom: 0.75rem;
  margin-top: 2rem;
}

h1 { font-size: 1.8rem; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.15rem; }

p { margin-bottom: 1.25rem; }

a { color: var(--accent); }

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.15em 0.35em;
  border-radius: 3px;
}

pre {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: 0 0.4rem 1.2rem var(--paper-shadow);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.25rem;
}

pre code { background: none; padding: 0; }

blockquote {
  border-left: 3px solid var(--border);
  background: var(--quote-bg);
  padding-left: 1rem;
  padding-top: 0.35rem;
  padding-bottom: 0.35rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

/* Post list */
.post-list {
  list-style: none;
  padding: 0;
}

.post-list li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.post-list li:last-child { border-bottom: none; }

.post-list a {
  color: var(--fg);
  text-decoration: none;
  font-weight: 500;
}

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

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

/* Post */
.post-header { margin-bottom: 2rem; }
.post-title { margin-top: 0; }

.post-content h2:first-child { margin-top: 0; }

.post-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.post-footer a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.post-footer a:hover { color: var(--fg); }

/* Tags */
.tag {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1em 0.45em;
  font-size: 0.8rem;
  text-decoration: none;
}

.taxonomy-list {
  list-style: none;
  padding: 0;
}

.taxonomy-list li {
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
}

.taxonomy-list li:last-child {
  border-bottom: none;
}

.taxonomy-count {
  color: var(--muted);
  font-size: 0.9rem;
  margin-left: 0.5rem;
}

.category-dropdown {
  margin-bottom: 0.9rem;
}

.category-dropdown summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  font-weight: 600;
}

.category-dropdown summary::-webkit-details-marker {
  display: none;
}

.category-dropdown summary::after {
  content: "+";
  color: var(--muted);
  margin-left: auto;
}

.category-dropdown[open] summary::after {
  content: "-";
}

.category-dropdown .post-list {
  padding: 0 0 0.7rem;
}

.category-dropdown .post-list li {
  padding: 0.45rem 0;
}

/* Home */
.home h2 { margin-top: 2.5rem; }

/* Footer */
.site-footer {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-footer p {
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.4;
}

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

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

.footer-links {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  font-size: 0.85rem;
  line-height: 1.4;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

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

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.pagination-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.pagination-link:hover {
  color: var(--fg);
}

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