/* ==========================================================================
   K09 Patterns — page styles
   Pattern browser (nav + annotated flow per pattern) and the live
   system-states demo. Behaviour: assets/js/pages/k09-patterns.js
   ========================================================================== */

/* ── Pattern browser: nav column + detail (spans two columns) ───────────── */

.pattern-browser {
  max-width: 1120px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 24px;
  align-items: start;
}

.pattern-nav {
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
  overflow: auto;
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--color-hairline);
}

.pattern-nav__item {
  display: flex;
  gap: 12px;
  align-items: center;
  min-height: 44px;
  padding: 8px 10px;
  border: 0;
  border-bottom: 1px solid var(--ink-a08);
  background: transparent;
  color: var(--graphite-900);
  text-align: left;
  cursor: pointer;
  font: 400 14px/1.3 'Geist', sans-serif;
}
.pattern-nav__item:hover { background: var(--graphite-0); }
.pattern-nav__item[aria-current="true"] {
  background: var(--graphite-0);
  font-weight: 500;
}

.pattern-nav__num {
  flex: none;
  width: 26px;
  font: 500 11px/1 'Geist Mono', monospace;
  color: var(--graphite-500);
}

.pattern-nav__title { flex: 1; }

/* Ring marker on the selected pattern */
.pattern-nav__dot {
  display: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1.5px solid var(--scrub-600);
}
.pattern-nav__item[aria-current="true"] .pattern-nav__dot { display: block; }

.pattern-detail {
  grid-column: span 2;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

/* ── One pattern ────────────────────────────────────────────────────────── */

.pattern {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.pattern__head {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.pattern__meta {
  font: 500 12px/1 'Geist Mono', monospace;
  letter-spacing: .08em;
  color: var(--graphite-500);
}

.pattern__title {
  margin: 0;
  font: 500 clamp(30px, 1.4rem + 2vw, 52px)/1.05 'Geist', sans-serif;
  letter-spacing: -.03em;
}

.pattern__goal {
  margin: 0;
  max-width: 640px;
  font: 400 17px/1.55 'Geist', sans-serif;
  color: var(--graphite-750);
  text-wrap: pretty;
}

/* Annotated steps */
.pattern-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-l);
  background: var(--graphite-0);
  overflow: hidden;
}

.pattern-step {
  position: relative;
  padding: 22px 20px 24px;
  border-right: 1px solid var(--ink-a08);
  border-bottom: 1px solid var(--ink-a08);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pattern-step__head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.pattern-step__index {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--graphite-900);
  display: flex;
  align-items: center;
  justify-content: center;
  font: 500 12px/1 'Geist Mono', monospace;
}

.pattern-step__rule {
  flex: 1;
  height: 1px;
  background: var(--ink-a20);
}

.pattern-step__element {
  font: 500 10px/1 'Geist Mono', monospace;
  color: var(--graphite-500);
}

.pattern-step__title { font: 500 17px/1.25 'Geist', sans-serif; }

.pattern-step__text {
  font: 400 14px/1.5 'Geist', sans-serif;
  color: var(--graphite-600);
}

/* Rules (dark) + states & edge cases */
.pattern__cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 20px;
}

.pattern-rules,
.pattern-edges {
  padding: 22px;
  border-radius: var(--radius-l);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pattern-rules {
  background: var(--graphite-900);
  color: var(--graphite-mist);
}

.pattern-rules__label {
  font: 500 11px/1 'Geist Mono', monospace;
  letter-spacing: .08em;
  color: var(--scrub-300);
}

.pattern-rules__item {
  display: flex;
  gap: 10px;
  font: 400 14px/1.5 'Geist', sans-serif;
}

.pattern-rules__dash {
  flex: none;
  color: var(--scrub-300);
}

.pattern-edges {
  background: var(--graphite-0);
  border: 1px solid var(--color-hairline);
}

.pattern-edges__item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font: 400 14px/1.5 'Geist', sans-serif;
  color: var(--graphite-750);
}

/* State tag: glyph + label + colour (never colour alone) */
.state-tag {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 22px;
  padding: 0 8px;
  border-radius: var(--radius-pill);
  font: 500 11px/1 'Geist', sans-serif;
}
.state-tag--empty,
.state-tag--offline { background: var(--graphite-100);    color: var(--graphite-600); }
.state-tag--loading,
.state-tag--edge    { background: var(--status-low-bg);     color: var(--status-low-fg); }
.state-tag--error   { background: var(--status-high-bg);    color: var(--status-high-fg); }
.state-tag--warning { background: var(--status-medium-bg);  color: var(--status-medium-fg); }
.state-tag--success { background: var(--status-success-bg); color: var(--status-success-fg); }

/* Footer: "SEEN IN" + previous / next */
.pattern-detail__footer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  padding-top: 8px;
  border-top: 1px solid var(--ink-a10);
}

.pattern-detail__seen {
  font: 400 13px/1.4 'Geist Mono', monospace;
  color: var(--graphite-500);
}

.pattern-detail__actions {
  display: flex;
  gap: 8px;
}

.pattern-detail__btn {
  height: 44px;
  padding: 0 16px;
  border: 1px solid var(--ink-a20);
  border-radius: var(--radius-pill);
  background: var(--graphite-0);
  color: var(--graphite-900);
  cursor: pointer;
}

.pattern-detail__btn--next {
  border-color: var(--graphite-900);
  background: var(--graphite-900);
  color: var(--graphite-50);
}

/* ── 09.2 System states, live ───────────────────────────────────────────── */

.state-demo {
  min-height: 280px;
  padding: 32px;
  border-radius: var(--radius-l);
  border: 1px solid var(--color-hairline);
  background: var(--graphite-0);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.state-demo__panel {
  --state-border: var(--ink-a20);
  --state-bg: var(--graphite-25);
  --state-fg: var(--graphite-600);
  max-width: 440px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.state-demo__panel--loading { --state-border: var(--cyan-700);  --state-bg: var(--cyan-50);  --state-fg: var(--cyan-700); }
.state-demo__panel--error   { --state-border: var(--red-600);   --state-bg: var(--red-50);   --state-fg: var(--red-600); }
.state-demo__panel--success { --state-border: var(--leaf-700);  --state-bg: var(--leaf-50);  --state-fg: var(--leaf-700); }
.state-demo__panel--offline { --state-border: var(--ink-a30);   --state-bg: var(--graphite-100); --state-fg: var(--graphite-600); }

.state-demo__icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 1px solid var(--state-border);
  background: var(--state-bg);
  color: var(--state-fg);
  display: flex;
  align-items: center;
  justify-content: center;
  font: 600 22px/1 'Geist Mono', monospace;
}

.state-demo__title {
  font: 500 24px/1.25 'Geist', sans-serif;
  letter-spacing: -.015em;
}

.state-demo__text {
  font: 400 15px/1.55 'Geist', sans-serif;
  color: var(--graphite-600);
}

.state-demo__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

/* Illustrative, non-interactive action labels. Empty and Success lead with
   a scrub primary; the other states use an ink outline. */
.state-demo__primary {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 20px;
  border: 1px solid var(--graphite-900);
  border-radius: var(--radius-pill);
  background: var(--graphite-0);
  color: var(--graphite-900);
  font: 500 15px/1 'Geist', sans-serif;
}
.state-demo__panel--empty .state-demo__primary,
.state-demo__panel--success .state-demo__primary {
  border-color: var(--scrub-600);
  background: var(--scrub-600);
  color: var(--graphite-0);
}

.state-demo__secondary {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 12px;
  font: 500 15px/1 'Geist', sans-serif;
  color: var(--graphite-900);
  text-decoration: underline;
  text-underline-offset: 3px;
}