/* tautik.me — paper / technical-manual theme, William Morris covers
 * ------------------------------------------------------------------
 * Contents: tokens · cover · layout/masthead · type · home · post lists ·
 *           blog controls · card grid · post · code · work · footer ·
 *           victorian details · transitions · lightbox · copy button ·
 *           progress · toc · prev-next · cmd-k search · responsive
 *
 * Rules (full version in RULES.md):
 *  - ALL colors come from the :root / [data-theme=dark] tokens below.
 *    Never hardcode a hex outside this block — dark mode breaks otherwise.
 *  - Mono (--mono) for UI/labels/headings, serif (--serif) for body prose.
 *  - .label = uppercase mono section marker; reuse it, don't invent new ones.
 */

:root {
  --bg: #f4eedd;
  --bg-grid: rgba(47, 86, 135, 0.07);
  --ink: #23272f;
  --muted: #76715f;
  --accent: #2f5687;
  --accent-soft: rgba(47, 86, 135, 0.12);
  --rule: #d8cfb4;
  --code-bg: #ece4cc;
  --code-border: #ddd3b6;
  --cover-light: block;
  --cover-dark: none;
  --serif: 'Charter', 'Iowan Old Style', 'Georgia', 'Times New Roman', serif;
  --mono: ui-monospace, 'SF Mono', 'Menlo', 'Cascadia Mono', 'Consolas', monospace;
}
[data-theme="dark"] {
  --bg: #161d29;
  --bg-grid: rgba(143, 179, 217, 0.05);
  --ink: #d6e0ea;
  --muted: #8b99a8;
  --accent: #93b8e0;
  --accent-soft: rgba(147, 184, 224, 0.14);
  --rule: #2b3645;
  --code-bg: #1d2634;
  --code-border: #2b3645;
  --cover-light: none;
  --cover-dark: block;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 18px/1.65 var(--serif);
  color: var(--ink);
  background:
    linear-gradient(var(--bg-grid) 1px, transparent 1px) 0 0 / 100% 28px,
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px) 0 0 / 28px 100%,
    var(--bg);
  text-rendering: optimizeLegibility;
}

/* ---------- cover banner (notion-style) ---------- */
.cover {
  width: 100%;
  background-color: var(--bg);
  background-size: cover;
  background-position: center 30%;
  border-bottom: 1px solid var(--rule);
}
.cover-big { height: min(36vh, 300px); }
.cover-small { height: min(20vh, 170px); }
:root .cover { background-image: var(--cov-l, url('/static/covers/marigold-light.webp')); }
[data-theme="dark"] .cover { background-image: var(--cov-d, url('/static/covers/marigold-dark.webp')); }

/* ---------- layout ---------- */
.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px 48px; }

.masthead {
  display: flex; align-items: baseline; justify-content: space-between;
  flex-wrap: wrap; gap: 8px;
  padding: 22px 0 18px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 36px;
}
.site-name {
  font-family: var(--mono);
  font-size: 17px; font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none; color: var(--ink);
}
.masthead nav { display: flex; align-items: center; gap: 18px; }
.masthead nav a {
  font-family: var(--mono); font-size: 13px;
  text-transform: uppercase; letter-spacing: 0.08em;
  text-decoration: none; color: var(--muted);
}
.masthead nav a:hover, .masthead nav a[aria-current="page"] { color: var(--accent); }
.masthead nav a[aria-current="page"] { border-bottom: 2px solid var(--accent); }

#theme-toggle {
  background: none; border: 1px solid var(--rule); border-radius: 50%;
  width: 30px; height: 30px; cursor: pointer; color: var(--ink);
  font-size: 14px; line-height: 1; padding: 0;
}
#theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
:root .moon { display: none; } :root .sun { display: inline; }
[data-theme="dark"] .moon { display: inline; } [data-theme="dark"] .sun { display: none; }

/* ---------- type ---------- */
h1, h2, h3, h4 { font-family: var(--mono); line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: 30px; margin: 0 0 16px; }
h2 { font-size: 21px; margin: 40px 0 12px; }
h3 { font-size: 17px; margin: 32px 0 10px; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
.label {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  color: var(--muted); margin: 0 0 10px;
}
.rule { border-top: 1px solid var(--rule); }

/* ---------- home ---------- */
.intro h1 { font-size: 32px; }
.intro .wave { color: var(--accent); }
section { margin-bottom: 44px; }
.more { font-family: var(--mono); font-size: 14px; }
.ghchart { width: 100%; height: auto; border-radius: 3px; display: block; }

.home-side { display: flex; flex-direction: column; gap: 14px; }
.ghchart { border: 1px solid var(--rule); border-radius: 4px; padding: 10px; background: var(--code-bg); }


/* ---------- post lists ---------- */
.post-list { list-style: none; padding: 0; margin: 0; }
.post-row {
  display: flex; gap: 18px; align-items: baseline;
  padding: 7px 0; border-bottom: 1px dashed var(--rule);
}
.post-row .label { flex: 0 0 64px; margin: 0; white-space: nowrap; }
.post-row a { color: var(--ink); text-decoration: none; }
.post-row a:hover { color: var(--accent); text-decoration: underline; }
.row-tag { font-family: var(--mono); font-size: 11px; color: var(--accent); margin-left: auto; white-space: nowrap; }
.year { margin-top: 36px; color: var(--muted); font-size: 16px; }
.page-title { margin-top: 0; }
.page-sub { color: var(--muted); margin-top: -6px; }

/* ---------- blog controls: chips + view toggle ---------- */
.blog-controls { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin: 20px 0 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em;
  background: none; border: 1px solid var(--rule); border-radius: 99px;
  color: var(--muted); padding: 3px 12px; cursor: pointer;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.on { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.view-toggle { display: flex; flex: 0 0 auto; border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; }
.view-toggle button {
  background: none; border: none; color: var(--muted);
  font-size: 14px; padding: 4px 10px; cursor: pointer; line-height: 1.4;
}
.view-toggle button.on { background: var(--accent-soft); color: var(--accent); }

/* ---------- card grid ---------- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px; margin-top: 14px; }
.pcard {
  display: flex; flex-direction: column; text-decoration: none;
  background: var(--code-bg); border: 1px solid var(--rule); border-radius: 6px;
  overflow: hidden; transition: border-color .15s;
}
.pcard:hover { border-color: var(--accent); }
.pcov { display: block; height: 84px; background-size: cover; background-position: center; }
:root .pcov { background-image: var(--cov-sm-l); }
[data-theme="dark"] .pcov { background-image: var(--cov-sm-d); }
.pbody { padding: 10px 12px 12px; }
.pt { display: block; font-family: var(--serif); font-size: 15px; line-height: 1.4; color: var(--ink); }
.pcard:hover .pt { color: var(--accent); }
.pm { display: block; font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.1em; color: var(--muted); margin-top: 7px; }

/* ---------- post ---------- */
.post-head { margin-bottom: 32px; }
.post-head h1 { margin-bottom: 8px; }
.tags { font-family: var(--mono); font-size: 13px; color: var(--accent); }
.tags span { margin-right: 10px; }
.post img {
  max-width: 100%; height: auto; display: block; margin: 24px auto;
  border: 1px solid var(--rule); border-radius: 4px; background: #fff;
}
.post blockquote {
  margin: 24px 0; padding: 4px 20px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft); color: var(--ink);
}
.post hr { border: none; border-top: 1px dashed var(--rule); margin: 36px 0; }
.post table { border-collapse: collapse; width: 100%; font-size: 16px; margin: 24px 0; display: block; overflow-x: auto; }
.post th, .post td { border: 1px solid var(--rule); padding: 8px 12px; text-align: left; }
.post th { font-family: var(--mono); font-size: 13px; letter-spacing: 0.05em; background: var(--code-bg); }
.post-end { text-align: center; color: var(--accent); font-size: 20px; margin: 44px 0 12px; }
.post-nav { font-family: var(--mono); font-size: 14px; }

/* ---------- code ---------- */
code {
  font-family: var(--mono); font-size: 0.86em;
  background: var(--code-bg); border: 1px solid var(--code-border);
  border-radius: 3px; padding: 1px 5px;
}
.codeblock { position: relative; margin: 24px 0; }
.code-lang {
  position: absolute; top: 0; right: 0;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em;
  color: var(--muted); text-transform: uppercase;
  padding: 6px 10px;
}
.codeblock pre {
  background: var(--code-bg); border: 1px solid var(--code-border);
  border-radius: 4px; padding: 16px; overflow-x: auto; margin: 0;
}
.codeblock pre code { background: none; border: none; padding: 0; font-size: 14px; line-height: 1.55; }

/* hljs — morris palette */
.hljs-comment, .hljs-quote { color: var(--muted); font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-built_in { color: var(--accent); font-weight: 600; }
.hljs-string, .hljs-attr, .hljs-template-tag { color: #7a6520; }
[data-theme="dark"] .hljs-string, [data-theme="dark"] .hljs-attr { color: #c9b46a; }
.hljs-number, .hljs-literal { color: #8a4b2d; }
[data-theme="dark"] .hljs-number, [data-theme="dark"] .hljs-literal { color: #d99a78; }
.hljs-title, .hljs-name, .hljs-function { color: var(--ink); font-weight: 600; }

/* ---------- work ---------- */
.work h3 { margin-top: 36px; border-top: 1px dashed var(--rule); padding-top: 24px; font-size: 17px; }
.work h3:first-child { border-top: none; padding-top: 0; margin-top: 0; }

/* ---------- footer ---------- */
footer { margin-top: 64px; }
.foot-row { display: flex; gap: 18px; align-items: baseline; padding: 18px 0 4px; flex-wrap: wrap; }
.foot-links a { font-family: var(--mono); font-size: 13px; }
.colophon { font-family: var(--mono); font-size: 12px; color: var(--muted); }

/* ---------- victorian print details ---------- */
::selection { background: var(--accent); color: var(--bg); }
.post > p:first-of-type::first-letter {
  font-size: 52px; float: left; line-height: 0.82;
  padding: 5px 8px 0 0; color: var(--accent); font-family: var(--serif);
}
.post hr { border: none; text-align: center; margin: 40px 0; }
.post hr::after { content: "✻ ❦ ✻"; color: var(--accent); letter-spacing: 14px; font-size: 14px; }
.post-end { letter-spacing: 12px; }

/* ---------- smooth page transitions ---------- */
@view-transition { navigation: auto; }
::view-transition-old(root), ::view-transition-new(root) { animation-duration: 0.18s; }

/* ---------- cover slow-pan on hover ---------- */
.pcov { transition: background-position 2.4s ease, filter 0.4s; }
.pcard:hover .pcov { background-position: 65% 60%; filter: saturate(1.15); }

/* ---------- image lightbox ---------- */
.zoomable { cursor: zoom-in; }
.lightbox {
  position: fixed; inset: 0; z-index: 50; display: flex;
  align-items: center; justify-content: center; padding: 4vmin;
  background: rgba(18, 24, 34, 0.88); cursor: zoom-out;
  opacity: 0; pointer-events: none; transition: opacity 0.22s;
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox img { max-width: 100%; max-height: 100%; border-radius: 4px; }

/* ---------- code copy button ---------- */
.copy-btn {
  position: absolute; top: 7px; right: 7px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.05em;
  background: var(--bg); border: 1px solid var(--rule); border-radius: 3px;
  color: var(--accent); padding: 2px 9px; cursor: pointer;
  opacity: 0; transition: opacity 0.18s;
}
.codeblock:hover .copy-btn { opacity: 1; }
.codeblock .code-lang { right: auto; left: 0; }

/* ---------- reading progress ---------- */
.progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--accent); z-index: 60;
}

/* ---------- floating toc ---------- */
.toc-float { display: none; }
@media (min-width: 1160px) {
  .toc-float {
    display: block; position: fixed;
    left: calc(50% + 380px); top: 220px; width: 200px;
  }
  .toc-float a {
    display: block; font-family: var(--mono); font-size: 11.5px; line-height: 1.5;
    color: var(--muted); text-decoration: none; padding: 4px 0 4px 10px;
    border-left: 2px solid var(--rule);
  }
  .toc-float a:hover { color: var(--accent); }
  .toc-float a.on { color: var(--accent); border-left-color: var(--accent); }
}

/* ---------- prev / next ---------- */
.pn { display: flex; gap: 12px; margin: 8px 0 24px; }
.pn a, .pn > span { flex: 1; }
.pn a {
  border: 1px solid var(--rule); border-radius: 6px; padding: 10px 14px;
  background: var(--code-bg); text-decoration: none; color: var(--ink);
  font-size: 14.5px; line-height: 1.4; transition: border-color 0.15s;
}
.pn a:hover { border-color: var(--accent); color: var(--accent); }
.pn .pn-lab { display: block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.15em; color: var(--muted); margin-bottom: 4px; }
.pn .pn-next { text-align: right; }

/* ---------- review mode (recalls only) ---------- */
#review-toggle {
  display: block; margin-top: 14px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em;
  background: none; border: 1px solid var(--accent); color: var(--accent);
  border-radius: 4px; padding: 5px 14px; cursor: pointer;
}
#review-toggle:hover { background: var(--accent); color: var(--bg); }
.review-only > *:not(.post-head):not(.recall) { display: none; }
.review-only .recall { counter-increment: recall; }
.review-only .recall summary::before {
  content: counter(recall, decimal-leading-zero);
  font-family: var(--mono); font-size: 11px; color: var(--muted); margin-right: 8px;
}

/* ---------- recall blocks (mnemonic prompts, pilot) ---------- */
.recall {
  margin: 28px 0; border: 1px dashed var(--accent); border-radius: 6px;
  background: var(--accent-soft);
}
.recall summary { cursor: pointer; padding: 13px 16px; font-size: 16.5px; list-style: none; line-height: 1.5; }
.recall summary::-webkit-details-marker { display: none; }
.recall summary:hover { color: var(--accent); }
.recall-mark { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; color: var(--accent); margin-right: 10px; white-space: nowrap; }
.recall[open] summary { border-bottom: 1px dashed var(--rule); }
.recall > p { padding: 2px 16px; font-size: 16.5px; }

/* ---------- responsive ---------- */
@media (max-width: 540px) {
  body { font-size: 17px; }
  h1, .intro h1 { font-size: 25px; }
  .post-row { flex-direction: row; gap: 12px; }
  .row-tag { display: none; }
  .masthead nav { gap: 12px; }
  /* covers collapse to a thin pattern strip on phones */
  .cover-big, .cover-small { height: 60px; }
  .blog-controls { flex-direction: column-reverse; }
  .card-grid { grid-template-columns: 1fr 1fr; }
}