/* ==========================================================================
   K01 Principles — page styles
   ========================================================================== */

/* ── Principle rows (01.1–01.3) ─────────────────────────────────────────── */

.principle-list {
  display: flex;
  flex-direction: column;
}

.principle {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 8px 32px;
  align-items: baseline;
  padding: 26px 0;
  border-bottom: 1px solid var(--ink-a08);
}

.principle__number {
  font: 400 28px/1 'Geist Mono', monospace;
  letter-spacing: -.03em;
  color: var(--graphite-500);
}

.principle__title {
  font: 500 clamp(20px, 1rem + .6vw, 26px)/1.2 'Geist', sans-serif;
  letter-spacing: -.015em;
}

.principle__body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.principle__text {
  font: 400 16px/1.6 'Geist', sans-serif;
  color: var(--graphite-750);
  text-wrap: pretty;
}

/* ── Do / Don't examples (01.4) ─────────────────────────────────────────── */

.do-dont-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.do-dont {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.do-dont__stage {
  position: relative;
  height: 280px;
  border-radius: var(--radius-l);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.do-dont__stage--do {
  justify-content: flex-end;
  padding: 28px;
  border: 1px solid var(--color-hairline);
  background: var(--graphite-0);
}

.do-dont__stage--dont {
  align-items: center;
  justify-content: center;
  background: var(--graphite-950);
}

/* Hatched aperture circle in the corner */
.do-dont__aperture {
  position: absolute;
  right: -60px;
  top: -60px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  border: 1px solid var(--ink-a14);
  background: repeating-linear-gradient(135deg, var(--sage-100) 0 10px, var(--sage-150) 10px 20px);
}

.do-dont__headline {
  position: relative;
  font: 500 36px/1 'Geist', sans-serif;
  letter-spacing: -.03em;
}
.do-dont__headline em { font: italic 400 1.1em 'Instrument Serif', serif; }

.do-dont__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* Fake intro loader (the "don't") */
.do-dont__loader {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 1px solid rgba(82, 224, 168, .5);
  display: flex;
  align-items: center;
  justify-content: center;
}

.do-dont__loader-core {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: 1px solid var(--scrub-300);
}

.do-dont__loader-label {
  font: 500 12px/1 'Geist Mono', monospace;
  letter-spacing: .1em;
  color: var(--mist-400);
}

.do-dont__loader-hint {
  font: 400 13px/1 'Geist', sans-serif;
  color: var(--mist-400);
}

.do-dont__caption {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.do-dont__text {
  font: 400 15px/1.5 'Geist', sans-serif;
  color: var(--graphite-750);
}

/* ── Pre-ship checklist (01.5) ──────────────────────────────────────────── */

.checklist__count {
  font: 500 13px/1 'Geist Mono', monospace;
  color: var(--graphite-600);
  font-variant-numeric: tabular-nums;
}

.checklist__progress {
  height: 4px;
  border-radius: 2px;
  background: var(--ink-a10);
  overflow: hidden;
}

.checklist__progress-bar {
  width: 0;
  height: 100%;
  background: var(--scrub-600);
  transition: width var(--dur-3) var(--ease-diastole);
}

.checklist {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: 4px 32px;
}

.checklist__item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  min-height: 44px;
  padding: 10px 0;
  border-bottom: 1px solid var(--ink-a08);
  cursor: pointer;
}

.checklist__item input {
  flex: none;
  width: 20px;
  height: 20px;
  margin: 1px 0 0;
  accent-color: var(--scrub-600);
}

.checklist__label {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.checklist__title { font: 500 15px/1.35 'Geist', sans-serif; }

.checklist__ref {
  font: 400 12px/1 'Geist Mono', monospace;
  color: var(--graphite-500);
}