/* The Ideation Desk - core styles: tokens, base, buttons, and the article body (.prose).
   Ink and marker: deep navy ink on cool paper, with one highlighter-yellow accent. */

:root {
  color-scheme: light;
  --paper: #f4f6fa;
  --card: #ffffff;
  --ink: #0e1a36;
  --muted: #56627a;
  --line: #dde3ee;
  --soft: #e9eef6;
  --accent: #2352e8;
  --accent-soft: #e7edff;
  --marker: #ffdf5d;
  --marker-ink: #0e1a36;
  --btn-bg: #0e1a36;
  --btn-ink: #ffffff;
  --band: #0e1a36;
  --band-ink: #f2f5fc;
  --ok: #12805c;
  --danger: #c6362b;
  --code-bg: #0f1830;
  --code-ink: #e6ebf7;
  --serif: 'Newsreader', 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, serif;
  --sans: 'Instrument Sans', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --page: 1180px;
  --wide: 1040px;
  --measure: 680px;
}

html[data-theme='dark'] {
  color-scheme: dark;
  --paper: #0a1020;
  --card: #111a2e;
  --ink: #e9eefb;
  --muted: #9aa6bf;
  --line: #1f2b46;
  --soft: #17223b;
  --accent: #8aa9ff;
  --accent-soft: #16224a;
  --btn-bg: #e9eefb;
  --btn-ink: #0a1020;
  --band: #16224a;
  --band-ink: #eef2fc;
  --ok: #4cc79a;
  --danger: #ff8a7e;
  --code-bg: #0b1328;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, video, iframe { max-width: 100%; }
img { display: block; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
svg { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex: none; }
::selection { background: var(--marker); color: var(--marker-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 100;
  background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: 10px;
}
.skip-link:focus { top: 12px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border: 1px solid transparent; border-radius: 999px;
  font: 600 0.92rem/1.2 var(--sans); text-decoration: none; white-space: nowrap;
  transition: background 0.15s, border-color 0.15s, filter 0.15s;
}
.btn svg { width: 16px; height: 16px; }
.btn-primary, .btn-solid { background: var(--btn-bg); color: var(--btn-ink); }
.btn-primary:hover, .btn-solid:hover { background: color-mix(in srgb, var(--btn-bg) 85%, var(--accent)); }
.btn-ghost, .btn-outline { background: var(--card); border-color: var(--line); color: var(--ink); }
.btn-ghost:hover, .btn-outline:hover { border-color: var(--ink); }
.btn-marker { background: var(--marker); color: var(--marker-ink); }
.btn-marker:hover { filter: brightness(0.95); }
.btn-sm { padding: 8px 16px; font-size: 0.85rem; }

/* Article body - increased font size for comfortable editorial reading */
.prose {
  font: 400 1.32rem/1.8 var(--serif);
  color: var(--ink);
  overflow-wrap: break-word;
  font-optical-sizing: auto;
}
.prose > * + * { margin-top: 1.25em; }
.prose p { margin: 0; }
.prose h2, .prose h3, .prose h4 {
  margin: 0; font-family: var(--serif); font-weight: 600; line-height: 1.2;
  letter-spacing: -0.018em; scroll-margin-top: 96px; text-wrap: balance;
}
.prose h2 { font-size: 1.72em; margin-top: 2.1em; }
.prose h3 { font-size: 1.36em; margin-top: 1.8em; }
.prose h4 { font-family: var(--sans); font-size: 1.06em; letter-spacing: 0; margin-top: 1.6em; }
.prose h2 + *, .prose h3 + *, .prose h4 + * { margin-top: 0.6em; }
.prose a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
.prose a:hover { text-decoration-thickness: 2px; }
.prose strong { font-weight: 600; }
.prose u { text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
.prose sub, .prose sup { font-size: 0.7em; }
.prose mark {
  color: inherit; padding: 0 0.12em;
  background: linear-gradient(180deg, transparent 52%, color-mix(in srgb, var(--marker) 90%, transparent) 52%);
}
html[data-theme='dark'] .prose mark { background: var(--marker); color: var(--marker-ink); border-radius: 3px; }
.prose code {
  font: 500 0.82em var(--mono); background: var(--soft); border-radius: 6px; padding: 0.14em 0.4em;
}
.prose ul, .prose ol { padding-left: 1.35em; }
.prose li + li { margin-top: 0.45em; }
.prose li::marker { color: var(--accent); }

.prose blockquote {
  margin: 0; margin-top: 1.9em; padding: 0 0 0 1.15em; border-left: 3px solid var(--marker);
  font-size: 1.2em; line-height: 1.52; font-style: italic;
}
.prose blockquote + * { margin-top: 1.9em; }
.prose blockquote p { margin: 0; }
.prose blockquote cite {
  display: block; margin-top: 0.7em; font: 500 0.82rem/1.4 var(--sans); font-style: normal; color: var(--muted);
}
.prose blockquote cite::before { content: '\2014\00a0'; }

.prose hr.b-divider {
  border: 0; width: 72px; height: 3px; border-radius: 3px; background: var(--marker); margin: 2.6em auto;
}

/* Code */
.prose pre.b-code {
  position: relative; margin-left: 0; margin-right: 0; overflow: auto;
  background: var(--code-bg); color: var(--code-ink); border-radius: 14px;
  padding: 2.6em 1.25em 1.15em; font: 400 0.86rem/1.7 var(--mono); tab-size: 2;
}
.prose pre.b-code code { background: none; padding: 0; font: inherit; color: inherit; white-space: pre; }
.prose pre.b-code[data-lang]::before {
  content: attr(data-lang); position: absolute; top: 0.8em; left: 1.25em;
  font: 500 0.72rem/1 var(--sans); color: #8fa0c6;
}
.code-copy {
  position: absolute; top: 0.5em; right: 0.6em; padding: 5px 10px; border: 0; border-radius: 8px;
  background: rgba(255, 255, 255, 0.08); color: #c9d4ef; font: 500 0.72rem/1 var(--sans);
}
.code-copy:hover { background: rgba(255, 255, 255, 0.16); }
.tok-c { color: #7f8db0; font-style: italic; }
.tok-s { color: #a6e3b4; }
.tok-n { color: #ffcf7a; }
.tok-k { color: #8fb0ff; }
.tok-f { color: #ffe08a; }

/* Images, gallery, media, and image source attribution */
.prose figure { margin: 0; margin-top: 1.9em; }
.prose figure + * { margin-top: 1.9em; }
.prose .b-image img, .prose .b-gallery img { width: 100%; border-radius: 14px; background: var(--soft); }
.prose .b-image img { cursor: zoom-in; }
.prose figcaption {
  margin-top: 0.75em; font: 400 0.88rem/1.5 var(--sans); color: var(--muted); text-align: center;
  display: flex; flex-direction: column; gap: 3px; align-items: center;
}
.prose figcaption .fig-source {
  font-size: 0.8rem; color: color-mix(in srgb, var(--muted) 85%, transparent);
}
.prose figcaption .fig-source a {
  color: inherit; text-decoration: underline; text-underline-offset: 2px;
}
.prose figcaption .fig-source a:hover { color: var(--ink); }
.prose .size-wide, .prose .size-full {
  width: min(var(--wide), calc(100vw - 40px)); margin-left: 50%; transform: translateX(-50%);
}
.prose .size-full { width: min(1320px, calc(100vw - 40px)); }
.prose .g-grid { display: grid; gap: 10px; }
.prose .cols-2 .g-grid { grid-template-columns: repeat(2, 1fr); }
.prose .cols-3 .g-grid { grid-template-columns: repeat(3, 1fr); }
.prose .cols-4 .g-grid { grid-template-columns: repeat(4, 1fr); }
.prose .g-item { display: block; }
.prose .g-item img { aspect-ratio: 1; object-fit: cover; border-radius: 10px; cursor: zoom-in; }
.prose .b-video video { width: 100%; border-radius: 14px; background: #000; display: block; }
.prose .b-audio audio { width: 100%; display: block; }

/* Embeds */
.prose .embed-frame {
  position: relative; width: 100%; border-radius: 14px; overflow: hidden;
  background: var(--soft); border: 1px solid var(--line);
}
.prose .embed-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.prose .b-social { display: flex; flex-direction: column; align-items: center; }
.prose .b-social blockquote {
  border: 1px solid var(--line); border-radius: 14px; padding: 1em 1.2em; font: 400 1rem/1.6 var(--sans); font-style: normal; width: 100%;
}
.prose .b-social .twitter-tweet, .prose .b-social .instagram-media { margin: 0 auto !important; }
.prose .b-embed-link { word-break: break-all; font: 400 1rem/1.5 var(--sans); }

/* Bookmark card */
.prose a.b-bookmark {
  display: flex; border: 1px solid var(--line); border-radius: 14px; background: var(--card);
  overflow: hidden; color: var(--ink); text-decoration: none; margin-top: 1.9em;
}
.prose a.b-bookmark:hover { border-color: var(--ink); }
.b-bookmark .bm-text { flex: 1; min-width: 0; padding: 16px 18px; display: flex; flex-direction: column; gap: 6px; font-family: var(--sans); }
.b-bookmark .bm-title { font: 600 1rem/1.35 var(--sans); }
.b-bookmark .bm-desc {
  font: 400 0.88rem/1.5 var(--sans); color: var(--muted);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.b-bookmark .bm-site { font: 500 0.78rem/1.3 var(--sans); color: var(--muted); }
.b-bookmark .bm-img { flex: 0 0 34%; min-height: 110px; position: relative; background: var(--soft); }
.b-bookmark .bm-img img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

/* Callout */
.prose .b-callout {
  display: flex; gap: 14px; padding: 16px 18px; border-radius: 14px; font: 400 1.02rem/1.65 var(--sans);
  background: var(--soft); border: 1px solid var(--line); margin-top: 1.9em;
}
.b-callout .co-emoji { font-size: 1.25rem; line-height: 1.5; }
.b-callout .co-body { flex: 1; min-width: 0; }
.b-callout.tone-info { background: color-mix(in srgb, var(--accent) 9%, var(--card)); border-color: color-mix(in srgb, var(--accent) 35%, var(--line)); }
.b-callout.tone-tip { background: color-mix(in srgb, var(--ok) 10%, var(--card)); border-color: color-mix(in srgb, var(--ok) 35%, var(--line)); }
.b-callout.tone-warning { background: color-mix(in srgb, var(--marker) 22%, var(--card)); border-color: color-mix(in srgb, var(--marker) 70%, var(--line)); }
.b-callout.tone-danger { background: color-mix(in srgb, var(--danger) 9%, var(--card)); border-color: color-mix(in srgb, var(--danger) 35%, var(--line)); }

/* Button, table, toggle, file */
.prose p.b-button { margin-top: 1.6em; }
.prose p.b-button.align-center { text-align: center; }
.prose p.b-button .btn { text-decoration: none; }
.prose .b-solid, .prose .btn-solid { color: var(--btn-ink); }
.prose .b-table { overflow-x: auto; margin-top: 1.9em; border: 1px solid var(--line); border-radius: 12px; }
.b-table table { border-collapse: collapse; width: 100%; font: 400 0.95rem/1.5 var(--sans); }
.b-table th, .b-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
.b-table th { font-weight: 600; background: var(--soft); }
.b-table tr:last-child td { border-bottom: 0; }
.prose details.b-toggle { border: 1px solid var(--line); border-radius: 12px; background: var(--card); margin-top: 1.5em; }
.b-toggle summary { cursor: pointer; padding: 14px 18px; font: 600 1rem/1.4 var(--sans); list-style: none; display: flex; align-items: center; gap: 10px; }
.b-toggle summary::-webkit-details-marker { display: none; }
.b-toggle summary::before { content: ''; width: 7px; height: 7px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(-45deg); transition: transform 0.15s; }
.b-toggle[open] summary::before { transform: rotate(45deg); }
.b-toggle .tg-body { padding: 0 18px 16px 35px; font: 400 1rem/1.7 var(--sans); }
.prose a.b-file {
  display: flex; align-items: center; gap: 12px; padding: 14px 18px; border: 1px solid var(--line);
  border-radius: 12px; font: 500 0.95rem/1.4 var(--sans); color: var(--ink); text-decoration: none; background: var(--card); margin-top: 1.9em;
}
.prose a.b-file:hover { border-color: var(--ink); }
.b-file .f-ico { width: 34px; height: 34px; border-radius: 50%; background: var(--soft); display: grid; place-items: center; font-size: 1.1rem; }
.b-file .f-size { margin-left: auto; color: var(--muted); font-size: 0.82rem; }

@media (max-width: 760px) {
  .prose { font-size: 1.16rem; line-height: 1.75; }
  .prose .size-wide, .prose .size-full { width: 100%; margin-left: 0; transform: none; }
  .prose .cols-3 .g-grid, .prose .cols-4 .g-grid { grid-template-columns: repeat(2, 1fr); }
  .b-bookmark .bm-img { display: none; }
}

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