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

/* dark is the default; light via OS preference or the [light] toggle */
:root {
  --bg: #0a0a0a;
  --bg-raised: #111111;
  --text: #e8e6e3;
  --text-strong: #ffffff;
  --text-muted: #8a8784;
  --text-faint: #4a4846;
  --border: #1e1e1e;
  --border-strong: #2e2e2e;
  --nav-bg: rgba(10, 10, 10, 0.6);
  --heat-1: #7b4dff;
  --heat-2: #ff3d7f;
  --heat-3: #ff6a3d;
  --heat-4: #ffb36b;
  --accent: var(--heat-3);
  --code-inline: var(--heat-4);
  --heat-gradient: linear-gradient(90deg, var(--heat-1), var(--heat-2), var(--heat-3));

  /* ASCII field palette: idle, idle-bright, label, then heat cold → hot */
  --field-0: #262626; --field-1: #3d3d3d; --field-2: #d6d6d6;
  --field-3: #4b3fd1; --field-4: #7b4dff; --field-5: #c04bd6; --field-6: #ff3d7f;
  --field-7: #ff6a3d; --field-8: #ffb36b; --field-9: #fff1d0;
  --field-10: #8a8784;

  /* syntax */
  --syn-comment: #5c5956;
  --syn-keyword: #a08bff;
  --syn-string: #ffb36b;
  --syn-fn: #ff6b9a;
  --syn-number: #ff8a5c;
  --syn-type: #e8c9ff;
  --syn-punct: #6f6c69;

  --max-width: 680px;
  --font-sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) { 
    --bg: #e2d5b9;
    --bg-raised: #d6c8a8;
    --text: #2a2317;
    --text-strong: #000000;
    --text-muted: #62553d;
    --text-faint: #998868;
    --border: #cdbe9d;
    --border-strong: #bba984;
    --nav-bg: rgba(226, 213, 185, 0.72);
    --heat-1: #5b3dff;
    --heat-2: #e0245e;
    --heat-3: #e8501f;
    --heat-4: #b8560a;
    --code-inline: #c0420f;
    --field-0: #d1c3a2; --field-1: #bba984; --field-2: #26231f;
    --field-3: #9d8fff; --field-4: #7b4dff; --field-5: #b23ac9; --field-6: #e8306c;
    --field-7: #f0562a; --field-8: #e07a12; --field-9: #9a3a00;
    --field-10: #7a6b51;
    --syn-comment: #7e7056;
    --syn-keyword: #5b3dd6;
    --syn-string: #b8560a;
    --syn-fn: #c41d55;
    --syn-number: #d4481a;
    --syn-type: #7a2fa0;
    --syn-punct: #74674d;
    color-scheme: light;
   }
}
:root[data-theme="light"] { 
    --bg: #e2d5b9;
    --bg-raised: #d6c8a8;
    --text: #2a2317;
    --text-strong: #000000;
    --text-muted: #62553d;
    --text-faint: #998868;
    --border: #cdbe9d;
    --border-strong: #bba984;
    --nav-bg: rgba(226, 213, 185, 0.72);
    --heat-1: #5b3dff;
    --heat-2: #e0245e;
    --heat-3: #e8501f;
    --heat-4: #b8560a;
    --code-inline: #c0420f;
    --field-0: #d1c3a2; --field-1: #bba984; --field-2: #26231f;
    --field-3: #9d8fff; --field-4: #7b4dff; --field-5: #b23ac9; --field-6: #e8306c;
    --field-7: #f0562a; --field-8: #e07a12; --field-9: #9a3a00;
    --field-10: #7a6b51;
    --syn-comment: #7e7056;
    --syn-keyword: #5b3dd6;
    --syn-string: #b8560a;
    --syn-fn: #c41d55;
    --syn-number: #d4481a;
    --syn-type: #7a2fa0;
    --syn-punct: #74674d;
    color-scheme: light;
   }

html { font-size: 17px; line-height: 1.7; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection { background: var(--heat-2); color: var(--bg); }

a { color: inherit; text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--text-strong); }
:focus-visible { outline: 1px dashed var(--accent); outline-offset: 3px; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

.skip {
  position: absolute; left: 1rem; top: -3rem; z-index: 10;
  font: 0.8rem var(--font-mono); background: var(--accent); color: #000; padding: 0.3rem 0.6rem;
}
.skip:focus { top: 1rem; }

/* ───────────────────────────── field / header ───────────────────────────── */
.field-wrap {
  position: relative;
  height: 128px;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.has-banner .field-wrap { height: 240px; }

.is-home .field-wrap { height: min(72vh, 680px); min-height: 380px; border-bottom: 0; }

/* fade the field into the page */
.field-wrap::after {
  content: "";
  position: absolute; inset: auto 0 0 0; height: 40%;
  background: linear-gradient(to bottom, transparent, var(--bg));
  pointer-events: none;
}

.field {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: block;
  pointer-events: none;
}

.header {
  position: relative; z-index: 2;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  max-width: 1200px; margin: 0 auto;
  padding: 1.25rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.site-title { color: var(--text); font-weight: 500; letter-spacing: -0.01em; }
.site-title .prompt { color: var(--text-faint); }
.caret { color: var(--accent); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.nav { display: flex; gap: 0.25rem; }
.nav a {
  color: var(--text-muted);
  padding: 0.15rem 0.5rem;
  background: var(--nav-bg);
  backdrop-filter: blur(4px);
}
.nav a::before { content: "["; color: var(--text-faint); }
.nav a::after  { content: "]"; color: var(--text-faint); }
.nav a:hover, .nav a[aria-current="page"] { color: var(--text-strong); }
.nav a[aria-current="page"]::before,
.nav a[aria-current="page"]::after { color: var(--accent); }

.theme-toggle {
  font: inherit; color: var(--text-faint); cursor: pointer;
  background: var(--nav-bg); backdrop-filter: blur(4px);
  border: 0; padding: 0.15rem 0.5rem;
}
.theme-toggle::before { content: "("; }
.theme-toggle::after { content: ")"; }
.theme-toggle span { color: var(--text-muted); transition: color 0.15s ease; }
.theme-toggle:hover span { color: var(--accent); }

.field-hint {
  position: absolute; z-index: 4; right: 1.5rem; bottom: 1.25rem;
  display: flex; align-items: center; gap: 0.75rem;
  font: 0.7rem var(--font-mono); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-faint);
}
.field-hint button {
  font: inherit; letter-spacing: inherit; text-transform: inherit;
  color: var(--text-muted); background: var(--nav-bg); backdrop-filter: blur(4px);
  border: 1px solid var(--border-strong); padding: 0.2rem 0.55rem; cursor: pointer;
}
.field-hint button:hover { color: var(--accent); border-color: var(--accent); }

/* ───────────────────────────── layout ───────────────────────────── */
.container {
  flex: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3.5rem 1.5rem 3rem;
  display: flex; flex-direction: column;
}
.is-home .container { margin-top: -4rem; position: relative; z-index: 3; }
.main { flex: 1; }

/* ───────────────────────────── home ───────────────────────────── */
.home-intro {
  font-size: 1.2rem;
  line-height: 1.65;
  color: var(--text-muted);
  margin-bottom: 4rem;
  max-width: 36ch;
}
.hl { color: var(--text); background: var(--heat-gradient) no-repeat 0 100% / 100% 1px; }

.section-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1.25rem;
}
.section-title::before { content: "// "; color: var(--text-faint); }
.section-title a:hover { color: var(--text-strong); }
.count { color: var(--text-faint); }

/* ───────────────────────────── post list ───────────────────────────── */
.post-list { list-style: none; border-top: 1px solid var(--border); }

.post-row {
  position: relative;
  display: flex; align-items: baseline; gap: 1rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.post-idx, .post-row-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  transition: color 0.15s ease;
}

.post-row-title { transition: transform 0.25s cubic-bezier(.2,.7,.2,1), color 0.15s ease; }

.post-leader {
  flex: 1; min-width: 1.5rem;
  border-bottom: 1px dotted var(--border-strong);
  transform: translateY(-0.3em);
  transition: border-color 0.15s ease;
}

.post-row::before {
  content: ""; position: absolute; left: 0; bottom: -1px; height: 1px; width: 100%;
  background: var(--heat-gradient);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.45s cubic-bezier(.2,.7,.2,1);
}

.post-row:hover { color: var(--text-strong); }
.post-row:hover::before { transform: scaleX(1); }
.post-row:hover .post-idx { color: var(--accent); }
.post-row:hover .post-row-title { transform: translateX(0.35rem); }
.post-row:hover .post-row-date { color: var(--text-muted); }
.post-row:hover .post-leader { border-color: var(--text-faint); }

/* ───────────────────────────── tags ───────────────────────────── */
.tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}
.tag::before { content: "#"; color: var(--text-faint); transition: color 0.15s ease; }
.tag:hover { color: var(--text-strong); }
.tag:hover::before { color: var(--accent); }
.tag sup { font-size: 0.65em; color: var(--text-faint); margin-left: 0.15em; }

.tags-list { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; }
.tags-list .tag { font-size: 1rem; }

/* ───────────────────────────── post ───────────────────────────── */
.post-header { margin-bottom: 3rem; }

.post-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.post-meta .sep { color: var(--text-faint); margin: 0 0.5rem; }

.post-title {
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin-bottom: 1.1rem;
}

.post-tags { display: flex; gap: 1rem; flex-wrap: wrap; }

.post-content { font-size: 1.02rem; }

.post-content h2,
.post-content h3 {
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.3;
}
.post-content h2 { font-size: 1.4rem; margin: 3rem 0 1rem; }
.post-content h3 { font-size: 1.12rem; margin: 2.25rem 0 0.75rem; }
.post-content h2::before,
.post-content h3::before {
  font-family: var(--font-mono); font-weight: 400; color: var(--text-faint);
  margin-right: 0.5rem;
}
.post-content h2::before { content: "##"; }
.post-content h3::before { content: "###"; }

.post-content p, .post-content ul, .post-content ol { margin-bottom: 1.4rem; }
.post-content ul, .post-content ol { padding-left: 1.4rem; }
.post-content li { margin-bottom: 0.45rem; }
.post-content li::marker { color: var(--text-faint); font-family: var(--font-mono); }
.post-content strong { color: var(--text-strong); font-weight: 500; }

.post-content a {
  color: var(--text);
  background: var(--heat-gradient) no-repeat 0 100% / 100% 1px;
  padding-bottom: 1px;
  transition: background-size 0.25s ease, color 0.15s ease;
}
.post-content a:hover { color: var(--bg); background-size: 100% 100%; }

.post-content blockquote {
  margin: 2rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 2px solid;
  border-image: linear-gradient(var(--heat-1), var(--heat-3)) 1;
  color: var(--text-muted);
}
.post-content blockquote p:last-child { margin-bottom: 0; }

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  color: var(--code-inline);
  background: var(--bg-raised);
  border: 1px solid var(--border);
  padding: 0.08rem 0.35rem;
  border-radius: 2px;
}

.post-content pre {
  position: relative;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  padding: 1.25rem;
  margin: 1.75rem 0;
  overflow-x: auto;
}
.post-content pre code {
  color: var(--text);
  background: none; border: 0; padding: 0;
  font-size: 0.82rem; line-height: 1.65;
}

.post-content img { max-width: 100%; height: auto; margin: 1.75rem 0; display: block; }

.post-content hr {
  border: 0; margin: 3rem 0; text-align: center; color: var(--text-faint);
  font-family: var(--font-mono); letter-spacing: 0.6em;
}
.post-content hr::after { content: "* * *"; }

.post-content table { width: 100%; border-collapse: collapse; margin: 1.75rem 0; font-size: 0.9rem; }
.post-content th, .post-content td { text-align: left; padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border); }
.post-content th { font-family: var(--font-mono); font-weight: 400; font-size: 0.78rem; color: var(--text-muted); }

.post-back { margin-top: 4rem; font-family: var(--font-mono); font-size: 0.85rem; }
.post-back a { color: var(--text-muted); }
.post-back a:hover { color: var(--accent); }

/* ── syntax (Prism tokens, build-time) ── */
.post-content pre[data-lang] { padding-top: 2.25rem; }
.post-content pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute; top: 0; right: 0;
  font: 0.7rem var(--font-mono); letter-spacing: 0.08em;
  color: var(--text-faint);
  padding: 0.35rem 0.75rem;
  border-left: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.post-content pre[data-lang]::after {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: var(--heat-gradient); opacity: 0.6;
}
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: var(--syn-comment); font-style: italic; }
.token.keyword, .token.selector, .token.important, .token.atrule, .token.tag { color: var(--syn-keyword); }
.token.string, .token.char, .token.attr-value, .token.regex, .token.inserted { color: var(--syn-string); }
.token.function, .token.macro, .token.attr-name { color: var(--syn-fn); }
.token.number, .token.boolean, .token.constant, .token.symbol, .token.deleted { color: var(--syn-number); }
.token.class-name, .token.builtin, .token.namespace, .token.lifetime-annotation { color: var(--syn-type); }
.token.punctuation, .token.operator { color: var(--syn-punct); }
.token.variable, .token.property { color: var(--text); }

/* ── reading progress ── */
.progress {
  position: fixed; z-index: 20; left: 50%; bottom: 1.25rem;
  transform: translate(-50%, 0.75rem);
  font: 0.75rem var(--font-mono); white-space: pre;
  color: var(--text-muted);
  background: var(--nav-bg); backdrop-filter: blur(6px);
  border: 1px solid var(--border);
  padding: 0.3rem 0.7rem;
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.progress.is-visible { opacity: 1; transform: translate(-50%, 0); }
.progress-bar::before { content: "["; color: var(--text-faint); }
.progress-bar::after  { content: "]"; color: var(--text-faint); }
.progress-fill {
  background: var(--heat-gradient);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
[data-progress-rest] { color: var(--text-faint); }

/* ───────────────────────────── about ───────────────────────────── */
.about-content h1 {
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  font-weight: 700; letter-spacing: -0.03em; line-height: 1.12;
  margin-bottom: 2rem;
}
.about-content p { margin-bottom: 1.4rem; }
.about-content strong { color: var(--text-strong); font-weight: 500; }
.about-content a { background: var(--heat-gradient) no-repeat 0 100% / 100% 1px; }
.about-content hr { border: 0; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* ───────────────────────────── footer ───────────────────────────── */
.footer { margin-top: 5rem; font-family: var(--font-mono); font-size: 0.78rem; }
.footer-rule {
  font: inherit; color: var(--text-faint);
  padding-bottom: 1rem; margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.footer-row { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer-links { display: flex; gap: 1.25rem; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--accent); }
.copyright { color: var(--text-faint); }

/* ───────────────────────────── responsive / a11y ───────────────────────────── */
@media (max-width: 560px) {
  html { font-size: 16px; }
  .header { padding: 1rem; }
  .site-title .prompt { display: none; }
  .nav a::before, .nav a::after,
  .theme-toggle::before, .theme-toggle::after { content: none; }
  .container { padding: 2.5rem 1rem 2rem; }
  .has-banner .field-wrap { height: 170px; }
  .is-home .field-wrap { height: 56vh; min-height: 300px; }
  .is-home .container { margin-top: -2.5rem; }
  .home-intro { font-size: 1.08rem; margin-bottom: 3rem; }
  .post-idx, .post-leader { display: none; }
  .post-row { flex-direction: column; gap: 0.15rem; }
  .post-row-date { order: -1; }
  .field-hint { right: 1rem; bottom: 3.25rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* Craft extensions: highlights, callouts, captions */
.post-content mark {
  color: var(--text-strong);
  background: linear-gradient(90deg, color-mix(in srgb, var(--heat-1) 35%, transparent), color-mix(in srgb, var(--heat-3) 35%, transparent));
  padding: 0 0.15em;
  border-radius: 2px;
}
.post-content .callout {
  margin: 2rem 0;
  padding: 1rem 1.25rem;
  background: var(--bg-raised);
  border: 1px solid var(--border-strong);
}
.post-content .callout > :last-child { margin-bottom: 0; }
.post-content .caption {
  margin-top: -1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}