/* KBM & AIKB — capstone talk companion
   Palette and type are drawn from the actual subject: KanBanMan's own
   card data uses literal Carbon Design System tokens (layer-01,
   layer-accent-01), and Carbon's own typeface is IBM Plex. This site
   borrows that real visual language rather than inventing one. */

:root {
  --bg: #f2f4f8;
  --surface: #ffffff;
  --surface-sunken: #e8ecf3;
  --border: #d0d7e2;
  --ink: #161616;
  --ink-muted: #525252;
  --ink-faint: #6f6f6f;
  --accent: #0f62fe;
  --accent-ink: #ffffff;
  --accent-wash: #edf3ff;
  --wart: #da1e28;
  --wart-wash: #fff1f1;
  --good: #24a148;
  --good-wash: #edfaf1;
  --focus: #0f62fe;
  --shadow: 0 2px 6px rgba(22, 22, 22, 0.08), 0 1px 2px rgba(22, 22, 22, 0.06);
  --radius: 4px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161616;
    --surface: #262626;
    --surface-sunken: #1f1f1f;
    --border: #3d3d3d;
    --ink: #f4f4f4;
    --ink-muted: #a8a8a8;
    --ink-faint: #8d8d8d;
    --accent: #4589ff;
    --accent-ink: #0d1117;
    --accent-wash: #1c2a45;
    --wart: #fa4d56;
    --wart-wash: #3a1a1c;
    --good: #42be65;
    --good-wash: #16281c;
    --focus: #4589ff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
  }
}

:root[data-theme="dark"] {
  --bg: #161616;
  --surface: #262626;
  --surface-sunken: #1f1f1f;
  --border: #3d3d3d;
  --ink: #f4f4f4;
  --ink-muted: #a8a8a8;
  --ink-faint: #8d8d8d;
  --accent: #4589ff;
  --accent-ink: #0d1117;
  --accent-wash: #1c2a45;
  --wart: #fa4d56;
  --wart-wash: #3a1a1c;
  --good: #42be65;
  --good-wash: #16281c;
  --focus: #4589ff;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }

html { color-scheme: light dark; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

code, .mono, .card-id, .tag-chip, .field-name {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

h1, h2, h3, h4 { text-wrap: balance; font-weight: 600; letter-spacing: -0.01em; }

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

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* ---------- Shell layout ---------- */

.shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  grid-template-rows: 56px 1fr;
  grid-template-areas:
    "topbar topbar"
    "nav main";
  min-height: 100vh;
}

.topbar {
  grid-area: topbar;
  display: flex;
  align-items: center;
  gap: 12px;
  padding-inline: 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.topbar .brand {
  font-weight: 600;
  font-size: 15px;
}

.topbar .brand .divider { color: var(--ink-faint); margin: 0 8px; font-weight: 400; }

.crumb {
  color: var(--ink-muted);
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.crumb .sep { margin: 0 6px; color: var(--ink-faint); }

.theme-toggle {
  margin-left: auto;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink-muted);
  border-radius: var(--radius);
  padding: 6px 10px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink-faint); }

.nav {
  grid-area: nav;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 16px 0;
  overflow-y: auto;
}

.nav-section { margin-bottom: 4px; }

.nav-section-title {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  font-family: inherit;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 10px 20px 6px;
  cursor: default;
}

.nav-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  border-left: 3px solid transparent;
  font-family: inherit;
  font-size: 14px;
  color: var(--ink-muted);
  padding: 8px 17px;
  cursor: pointer;
}

.nav-item:hover { background: var(--surface-sunken); color: var(--ink); }

.nav-item.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-wash);
  font-weight: 500;
}

.nav-item .n { font-family: "IBM Plex Mono", monospace; font-size: 11px; color: var(--ink-faint); min-width: 1.4em; }
.nav-item.active .n { color: var(--accent); }

.main {
  grid-area: main;
  padding: 32px clamp(20px, 4vw, 56px) 80px;
  max-width: 1100px;
}

/* ---------- Card rail (subtopic picker) ---------- */

.rail {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 32px;
}

.rail-card {
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  font-family: inherit;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 0.12s, box-shadow 0.12s, transform 0.12s;
}

.rail-card:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-1px); }

.rail-card.selected { border-color: var(--accent); background: var(--accent-wash); }

.rail-card .rail-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.rail-card.tone-wart .rail-eyebrow { color: var(--wart); }
.rail-card.tone-good .rail-eyebrow { color: var(--good); }
.rail-card.tone-pending .rail-eyebrow { color: var(--ink-faint); }

.rail-card .rail-title { font-size: 15px; font-weight: 600; }
.rail-card .rail-dek { font-size: 13px; color: var(--ink-muted); line-height: 1.4; }

.rail-card.pending { border-style: dashed; opacity: 0.85; }

/* ---------- Article / detail body ---------- */

.article { max-width: 68ch; }

.article .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.article .eyebrow.wart { color: var(--wart); }
.article .eyebrow.good { color: var(--good); }

.article h2 { font-size: 26px; margin: 0 0 4px; }
.article .dek { color: var(--ink-muted); font-size: 16px; margin: 0 0 24px; }

.article p { margin: 0 0 16px; }
.article ul, .article ol { margin: 0 0 16px; padding-left: 1.3em; }
.article li { margin-bottom: 6px; }

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-wash);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 12px 16px;
  margin: 20px 0;
  font-size: 14px;
}
.callout.wart { border-left-color: var(--wart); background: var(--wart-wash); }
.callout.good { border-left-color: var(--good); background: var(--good-wash); }
.callout .callout-label { font-weight: 600; font-size: 12px; letter-spacing: 0.04em; text-transform: uppercase; display: block; margin-bottom: 4px; }
.callout.wart .callout-label { color: var(--wart); }
.callout.good .callout-label { color: var(--good); }
.callout:not(.wart):not(.good) .callout-label { color: var(--accent); }

.pending-box {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 20px;
  color: var(--ink-muted);
  font-size: 14px;
  background: var(--surface-sunken);
}
.pending-box strong { color: var(--ink); }

pre {
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 12.5px;
  line-height: 1.5;
  margin: 0 0 20px;
}

table { border-collapse: collapse; width: 100%; margin: 0 0 20px; font-size: 13.5px; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-faint); font-weight: 600; }
.tbl-wrap { overflow-x: auto; margin-bottom: 20px; }

.tag-yes { color: var(--good); font-weight: 600; }
.tag-no { color: var(--ink-faint); }

.num { text-align: right; font-variant-numeric: tabular-nums; }
.bold { font-weight: 700; }
.accent { color: var(--accent); }
tr.bold td { font-weight: 700; }
tr.accent td { color: var(--accent); }
.muted { color: var(--ink-faint); font-size: 12px; }
td.muted { font-size: 12.5px; font-style: italic; }

/* ---------- Diagrams ---------- */

figure.diagram {
  margin: 24px 0 28px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

figure.diagram svg { max-width: 100%; height: auto; display: block; margin: 0 auto; }

figure.diagram figcaption {
  margin-top: 14px;
  font-size: 13px;
  color: var(--ink-muted);
  text-align: center;
}

.diag-hot {
  cursor: pointer;
}
.diag-hot rect, .diag-hot polygon {
  transition: fill 0.12s, stroke 0.12s;
}
.diag-hot:hover rect, .diag-hot:hover polygon {
  stroke: var(--accent);
  stroke-width: 2;
}
.diag-hot.active rect, .diag-hot.active polygon {
  fill: var(--accent-wash);
  stroke: var(--accent);
  stroke-width: 2;
}

.diag-detail {
  margin-top: 14px;
  padding: 12px 16px;
  background: var(--accent-wash);
  border-radius: var(--radius);
  font-size: 13.5px;
  border-left: 3px solid var(--accent);
  display: none;
}
.diag-detail.visible { display: block; }
.diag-detail strong { display: block; margin-bottom: 4px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--accent); }

.progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.progress button {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 9px 16px;
  font-family: inherit;
  font-size: 13.5px;
  color: var(--ink);
  cursor: pointer;
}
.progress button:hover { border-color: var(--accent); color: var(--accent); }
.progress button:disabled { opacity: 0.35; cursor: default; }
.progress button:disabled:hover { border-color: var(--border); color: var(--ink); }

@media (max-width: 860px) {
  .shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "topbar"
      "nav"
      "main";
  }
  .nav { border-right: none; border-bottom: 1px solid var(--border); max-height: 220px; }
  .main { padding: 24px 16px 60px; }
}