/* Community of Inquiry — styles (from the design prototype's single source of truth) */

:root {
  --paper: oklch(0.972 0.008 85);
  --paper-deep: oklch(0.945 0.012 85);
  --ink: oklch(0.27 0.015 75);
  --ink-soft: oklch(0.45 0.015 75);
  --ink-faint: oklch(0.52 0.012 75);  /* 4.7:1 or better on paper and paper-deep (0.62 was 3.1:1) */
  --hairline: oklch(0.87 0.012 85);
  --serif: "Newsreader", Georgia, serif;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
button { font: inherit; color: inherit; background: none; border: none; padding: 0; text-align: left; }

.page { max-width: 1280px; margin: 0 auto; padding: 0 40px 64px; }

/* ----- masthead ----- */
.masthead { padding: 64px 0 36px; max-width: 720px; }
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-soft); margin-bottom: 14px;
}
.site-title {
  font-family: var(--serif); font-weight: 500; font-size: clamp(38px, 4.6vw, 56px);
  line-height: 1.05; margin: 0 0 16px; letter-spacing: -0.01em; text-wrap: balance;
}
.site-sub {
  font-size: 18px; color: var(--ink-soft); margin: 0; max-width: 56ch; text-wrap: pretty;
}

/* ----- layout ----- */
.layout {
  display: grid; grid-template-columns: minmax(420px, 7fr) minmax(380px, 6fr);
  gap: 56px; align-items: start; border-top: 1px solid var(--hairline); padding-top: 36px;
}
.model-pane { position: sticky; top: 24px; }
.coi-venn { width: 100%; height: auto; display: block; }

/* svg text */
.coi-name { font-family: var(--serif); font-size: 35px; font-weight: 600; letter-spacing: 0.005em; }
.coi-sub { font-family: var(--mono); font-size: 20px; letter-spacing: 0.04em; }   /* no opacity on text (WCAG contrast) */
.coi-overlap { font-family: var(--sans); font-size: 20.5px; font-weight: 500; fill: oklch(0.99 0.005 85); opacity: 0.95; }
.coi-center { font-family: var(--mono); font-size: 20px; font-weight: 500; letter-spacing: 0.13em; fill: oklch(0.99 0.005 85); }
.coi-ring-label {
  font-family: var(--mono); font-size: 20px; letter-spacing: 0.18em; text-transform: uppercase;
  fill: var(--ink-faint); stroke: var(--paper); stroke-width: 12px; paint-order: stroke;
}

.back-link {
  display: inline-block; margin: 10px 0 0 8px; cursor: pointer;
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.04em; color: var(--ink-soft);
  border-bottom: 1px solid transparent; padding-bottom: 1px;
}
.back-link:hover { color: var(--ink); border-bottom-color: var(--ink-faint); }

/* ----- panel ----- */
.panel-card { animation: panel-in 0.45s ease; min-height: 420px; }
@keyframes panel-in {
  from { transform: translateY(12px); }
}

.detail-kicker {
  display: flex; align-items: center; gap: 9px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase;
  margin-bottom: 12px;
}
.detail-kicker-plain { color: var(--ink-soft); }
.detail-dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; flex: none; }
.detail-title {
  font-family: var(--serif); font-weight: 500; font-size: 36px; line-height: 1.1;
  margin: 0 0 18px; letter-spacing: -0.005em;
}
.detail-def {
  font-family: var(--serif); font-size: 19.5px; line-height: 1.45; font-style: italic;
  margin: 0 0 20px; padding: 2px 0 2px 18px; border-left: 3px solid; text-wrap: pretty;
}
.detail-def cite { display: block; font-family: var(--mono); font-style: normal; font-size: 12px; color: var(--ink-soft); margin-top: 8px; letter-spacing: 0.04em; }
.detail-body { margin: 0 0 14px; font-size: 17px; line-height: 1.62; color: var(--ink); max-width: 62ch; text-wrap: pretty; }
.detail-body-lg { font-size: 17.5px; line-height: 1.65; }
.detail-subhead {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-soft); margin: 30px 0 14px; padding-top: 18px; border-top: 1px solid var(--hairline);
}
.detail-hint { font-family: var(--mono); font-size: 15px; color: var(--ink-faint); margin-top: 22px; }
.detail-dynamics {
  margin-top: 26px; padding: 14px 16px; background: var(--paper-deep);
  font-size: 14.5px; color: var(--ink-soft); max-width: 62ch;
}
.detail-dynamics-label {
  display: block; font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; margin-bottom: 4px; color: var(--ink-faint);
}

/* ----- overview legend ----- */
.legend-list { display: flex; flex-direction: column; margin-top: 26px; border-top: 1px solid var(--hairline); }
.legend-item {
  display: flex; align-items: center; gap: 16px; padding: 16px 8px;
  border-bottom: 1px solid var(--hairline); cursor: pointer; transition: background 0.18s ease;
}
.legend-item:hover { background: var(--paper-deep); }
.legend-dot { width: 14px; height: 14px; border-radius: 50%; flex: none; }
.legend-text { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.legend-name { font-family: var(--serif); font-size: 21px; font-weight: 500; }
.legend-short { font-size: 15px; color: var(--ink-soft); }
.legend-arrow { color: var(--ink-faint); transition: transform 0.18s ease; }
.legend-item:hover .legend-arrow { transform: translateX(4px); color: var(--ink); }

/* ----- category cards ----- */
.cat-list { display: flex; flex-direction: column; }
.cat-card { border-bottom: 1px solid var(--hairline); padding: 14px 0 16px; }
.cat-card:first-child { border-top: 1px solid var(--hairline); }
.cat-head { display: flex; align-items: center; gap: 14px; width: 100%; cursor: pointer; }
.cat-index {
  width: 30px; height: 30px; border-radius: 50%; flex: none;
  display: grid; place-items: center;
  font-family: var(--mono); font-size: 13px; font-weight: 500;
}
.cat-titles { display: flex; flex-direction: column; flex: 1; gap: 1px; }
.cat-name { font-family: var(--serif); font-size: 20px; font-weight: 500; }
.cat-head:hover .cat-name { text-decoration: underline; text-decoration-color: var(--ink-faint); text-underline-offset: 3px; }
.cat-tag { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.06em; color: var(--ink-faint); text-transform: lowercase; }
.cat-caret { font-size: 20px; color: var(--ink-faint); font-weight: 300; width: 20px; text-align: center; flex: none; }
.cat-summary { margin: 8px 0 0 44px; font-size: 14.5px; color: var(--ink-soft); max-width: 56ch; text-wrap: pretty; }
.cat-body { margin: 12px 0 4px 44px; }
.cat-detail { margin: 0 0 14px; font-size: 15px; max-width: 56ch; text-wrap: pretty; }
.cat-ind-label {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-faint); margin-bottom: 8px;
}
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 6px; }
.chip {
  font-family: var(--mono); font-size: 12px; padding: 4px 10px;
  border: 1px solid; border-radius: 999px; white-space: nowrap;
}
.cat-examples { margin-top: 14px; }
.cat-example {
  font-family: var(--serif); font-style: italic; font-size: 16px; color: var(--ink-soft);
  margin: 0 0 6px; padding-left: 14px; border-left: 2px solid var(--hairline);
}

/* ----- practical inquiry cycle ----- */
.pi-cycle { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.pi-node {
  display: flex; align-items: center; gap: 8px; cursor: pointer;
  padding: 7px 14px 7px 8px; border-radius: 999px;
  border: 1px solid var(--hairline); background: var(--paper);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.pi-node:hover { border-color: color-mix(in oklch, var(--cat-color) 55%, transparent); }
.pi-node.active {
  background: color-mix(in oklch, var(--cat-color) 14%, var(--paper));
  border-color: color-mix(in oklch, var(--cat-color) 55%, transparent);
}
.pi-num {
  width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center;
  font-family: var(--mono); font-size: 11.5px;
  background: color-mix(in oklch, var(--cat-color) 20%, var(--paper));
  color: color-mix(in oklch, var(--cat-color) 75%, black);
}
.pi-name { font-size: 13.5px; font-weight: 500; }
.pi-arrow, .pi-loop { color: var(--ink-faint); font-size: 15px; }
.pi-loop { margin-left: 2px; font-size: 18px; }

/* ----- overlap pair pills ----- */
.pair-row { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin: 4px 0 20px; }
.pair-pill {
  display: flex; align-items: center; gap: 8px; cursor: pointer;
  font-size: 14px; font-weight: 500; padding: 7px 14px; border-radius: 999px;
  border: 1px solid var(--hairline); background: var(--paper); transition: border-color 0.2s ease, background 0.2s ease;
}
.pair-pill:hover {
  border-color: color-mix(in oklch, var(--cat-color) 55%, transparent);
  background: color-mix(in oklch, var(--cat-color) 10%, var(--paper));
}
.pair-x { color: var(--ink-faint); font-size: 15px; }

/* ----- colophon ----- */
.colophon {
  margin-top: 72px; padding-top: 20px; border-top: 1px solid var(--hairline);
  color: var(--ink-soft); font-size: 13.5px; max-width: 70ch;
}
.colophon p { margin: 0 0 6px; }
.colophon-source { font-family: var(--mono); font-size: 13px; color: var(--ink-faint); }

/* ----- responsive ----- */
/* ----- "Your course": the mini-course activity (js/your-course.js) ----- */
.legend-yours { margin-top: 18px; border-top: 1px solid var(--hairline); padding-top: 14px; }
.yc-reflect { margin: 0 0 20px; padding: 10px 12px; background: var(--paper-deep); border-radius: 6px; font-size: 14px; line-height: 1.5; color: var(--ink-soft); max-width: 62ch; }
.yc-block { margin: 0 0 16px; padding: 16px 18px; border: 1px solid var(--hairline); border-left: 4px solid var(--cat-color, var(--ink-faint)); border-radius: 8px; background: color-mix(in oklch, var(--paper) 70%, white); }
.yc-plain { --cat-color: var(--ink-faint); }
.yc-ai { --cat-color: #6c58a8; }
.yc-kicker { margin: 0 0 4px; font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase; color: #6c58a8; }
.yc-name { margin: 0 0 6px; display: flex; align-items: center; gap: 8px; font-family: var(--serif); font-size: 21px; line-height: 1.25; }
.yc-q { margin: 0 0 6px; font-size: 15.5px; line-height: 1.55; color: var(--ink); max-width: 62ch; }
.yc-hint { margin: 0 0 4px; font-family: var(--mono); font-size: 12px; line-height: 1.5; color: var(--ink-faint); }
.yc-privacy { color: #6c58a8; }
.yc-label { display: flex; flex-direction: column; gap: 6px; margin: 10px 0 4px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); }
.yc-textarea, .yc-input { box-sizing: border-box; width: 100%; margin-top: 8px; font-family: var(--sans); font-size: 15px; letter-spacing: 0; text-transform: none; line-height: 1.5; color: var(--ink); background: #fff; border: 1px solid var(--hairline); border-radius: 6px; padding: 9px 11px; }
.yc-label .yc-input { margin-top: 0; }
.yc-textarea { display: block; resize: vertical; }
.yc-textarea:focus, .yc-input:focus { outline: 2px solid var(--cat-color, var(--ink)); outline-offset: 1px; }
.yc-prompt { margin: 10px 0 0; max-height: 300px; overflow: auto; background: #fff; border: 1px solid var(--hairline); border-radius: 6px; padding: 12px 14px; font-family: var(--mono); font-size: 12.5px; line-height: 1.55; white-space: pre-wrap; word-wrap: break-word; }
.yc-btn { display: inline-block; margin-top: 12px; padding: 9px 14px; border-radius: 6px; background: var(--ink); color: var(--paper); font-weight: 600; font-size: 14px; cursor: pointer; }
.yc-btn:hover { opacity: 0.9; }
.yc-btn.is-done { background: #4F7A52; }
.yc-subhead { margin: 18px 0 8px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); }
.yc-list { list-style: none; margin: 0 0 8px; padding: 0; }
.yc-list li { position: relative; padding-left: 18px; margin-bottom: 5px; font-size: 14px; line-height: 1.5; color: var(--ink-soft); }
.yc-list li::before { content: ""; position: absolute; left: 2px; top: 7px; width: 7px; height: 7px; border-radius: 50%; background: #6c58a8; }
.yc-link { display: block; margin-top: 10px; padding: 12px 14px; border: 1px solid var(--hairline); border-radius: 8px; text-decoration: none; color: inherit; background: var(--paper-deep); }
.yc-link:hover { border-color: var(--ink); }
.yc-link-kicker { display: block; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-soft); }
.yc-link-label { display: block; font-weight: 600; }

@media (max-width: 980px) {
  .page { padding: 0 22px 48px; }
  .masthead { padding-top: 40px; }
  .layout { grid-template-columns: 1fr; gap: 28px; }
  .model-pane { position: static; max-width: 560px; margin: 0 auto; width: 100%; }
}

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

/* the overview's source note (29 Sep 2026) */
.detail-src { font-family: var(--mono); font-size: 12px; color: var(--ink-soft); letter-spacing: 0.04em; white-space: nowrap; }
.legend-yours { border-top: 1px solid var(--hairline); }