/* ==========================================================================
   olloa. component classes (the "Ink & Field" design system)
   Values come from olloa-tokens.css. Mobile-first; desktop layout from 768px.
   Class names keep the .fj- prefix from the old Fjord theme.
   ========================================================================== */

/* ---------- App shell ---------- */

/* Above the page background (#olloa-bg, olloa-backgrounds.css). */
.fj-app {
  position: relative;
  z-index: 1;
  --app-tabbar-h: calc(4rem + env(safe-area-inset-bottom));
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.fj-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--olloa-space-3) var(--olloa-space-4);
  padding: var(--olloa-space-3) var(--app-gutter);
  border-bottom: var(--olloa-hairline) solid var(--olloa-border);
}
.fj-header__start { display: flex; align-items: center; gap: var(--olloa-space-8); flex-wrap: wrap; }

/* Logo: mark 28 + wordmark h2. The full stop is haze. */
.fj-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--olloa-space-2);
  min-height: var(--olloa-tap);
  color: var(--olloa-ink);
  text-decoration: none;
}
.fj-logo:hover { color: var(--olloa-ink); }
.fj-logo__mark { width: 28px; height: 28px; flex: none; }
.fj-logo__word {
  font-family: var(--olloa-font-display);
  font-size: var(--olloa-text-h2);
  font-weight: var(--olloa-weight-prompt);
  letter-spacing: -0.04em;
  line-height: 1;
}
.fj-logo__dot { color: var(--olloa-haze); }

/* Top nav (desktop); hidden on phones where .fj-tabbar takes over */
.fj-nav { display: none; gap: var(--olloa-space-6); font-size: var(--olloa-text-small); font-weight: var(--olloa-weight-strong); }
.fj-nav a {
  display: inline-flex;
  align-items: center;
  min-height: var(--olloa-tap);
  color: var(--olloa-ink-muted);
  text-decoration: none;
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
  transition: color var(--olloa-dur-fast) var(--olloa-ease-out);
}
.fj-nav a:hover { color: var(--olloa-ink); }
.fj-nav a[aria-current="page"] { color: var(--olloa-ink); text-decoration-line: underline; }

/* ---------- Count chips: new = haze, learning = rose, review = field ---------- */

.fj-chips { display: flex; flex-wrap: wrap; gap: var(--olloa-space-2); }
.fj-chip {
  display: inline-flex;
  align-items: center;
  padding: var(--olloa-space-1) var(--olloa-space-2);
  border-radius: var(--olloa-radius-chip);
  font-size: var(--olloa-text-caption);
  font-weight: var(--olloa-weight-strong);
  line-height: var(--olloa-lh-caption);
  color: var(--olloa-ink);
  font-variant-numeric: tabular-nums;
}
.fj-chip--new      { background: var(--olloa-chip-new); }
.fj-chip--learning { background: var(--olloa-chip-learning); }
.fj-chip--review   { background: var(--olloa-chip-review); }
.fj-chip--desk     { display: none; } /* chips only worth showing on wide screens */

/* ---------- Study layout ---------- */

.fj-study {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--olloa-space-4);
  padding: var(--olloa-space-4) var(--app-gutter) var(--olloa-space-6);
  align-content: start;
}
.fj-study__aside { display: flex; flex-direction: column; gap: var(--olloa-space-3); min-width: 0; }

.fj-study__meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--olloa-space-4);
  font-size: var(--olloa-text-small);
  color: var(--olloa-ink-muted);
  font-variant-numeric: tabular-nums;
}

/* ---------- Progress: a 2px hairline ---------- */
/* <div class="fj-progress" style="--app-progress: 15%" role="progressbar" …> */

.fj-progress {
  height: var(--olloa-progress);
  background: var(--olloa-border);
  overflow: hidden;
}
.fj-progress::before {
  content: "";
  display: block;
  height: 100%;
  width: var(--app-progress, 0%);
  background: var(--olloa-ink);
  transition: width var(--olloa-dur-base) var(--olloa-ease-out);
}

/* ---------- Flashcard ---------- */
/* The whole card is a <button> while it shows the prompt. */

.fj-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--olloa-space-5);
  width: 100%;
  min-height: 18.75rem;
  padding: var(--olloa-space-8) var(--olloa-space-6);
  border: var(--olloa-hairline) solid var(--app-card-border);
  border-radius: var(--olloa-radius-card-l);
  background: var(--olloa-surface);
  color: var(--olloa-ink);
  text-align: left;
  overflow: hidden;
}

.fj-card__label,
.fj-section-label {
  font-size: var(--olloa-text-overline);
  font-weight: var(--olloa-weight-strong);
  letter-spacing: var(--olloa-tr-overline);
  text-transform: uppercase;
  color: var(--olloa-ink-muted);
}

.fj-card__body { display: flex; flex-direction: column; gap: var(--olloa-space-3); }
.fj-card__hint { font-size: var(--olloa-text-caption); color: var(--olloa-ink-muted); }
.fj-card.is-revealed .fj-card__hint { display: none; }

/* Key–value list in a panel (card stats, run stats) */
.fj-forms {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--olloa-space-2) var(--olloa-space-4);
  margin: 0;
  font-size: var(--olloa-text-small);
}
.fj-forms__row { display: flex; justify-content: space-between; gap: var(--olloa-space-2); }
.fj-forms__row dt { color: var(--olloa-ink-muted); }
.fj-forms__row dd { margin: 0; font-weight: var(--olloa-weight-strong); font-variant-numeric: tabular-nums; }

/* ---------- Buttons ---------- */

.fj-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--olloa-space-2);
  min-height: var(--olloa-tap);
  padding: 0 var(--olloa-space-5);
  border: var(--olloa-hairline) solid transparent;
  border-radius: var(--olloa-radius-button);
  font-family: var(--olloa-font-body);
  font-size: var(--olloa-text-body);
  font-weight: var(--olloa-weight-strong);
  text-decoration: none;
  transition: transform var(--olloa-dur-fast) var(--olloa-ease-out), opacity var(--olloa-dur-fast) var(--olloa-ease-out), background-color var(--olloa-dur-fast) var(--olloa-ease-out);
}
.fj-btn:active { transform: scale(0.98); }
.fj-btn--primary { background: var(--olloa-ink); color: var(--olloa-on-ink); }
.fj-btn--primary:hover { opacity: 0.9; color: var(--olloa-on-ink); }
.fj-btn--secondary { background: var(--olloa-surface); color: var(--olloa-ink); border-color: var(--olloa-border); }
.fj-btn--secondary:hover { background: var(--olloa-sunken); color: var(--olloa-ink); }
.fj-btn--block { width: 100%; min-height: var(--app-control-h); }

/* ---------- Rating bar: Again · Hard · Good · Easy, all secondary until pressed ---------- */

.fj-rating {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--olloa-space-2);
}
.fj-rating__btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  min-height: var(--app-control-h);
  padding: var(--olloa-space-1);
  border: var(--olloa-hairline) solid var(--olloa-border);
  border-radius: var(--olloa-radius-button);
  background: var(--olloa-surface);
  color: var(--olloa-ink);
  transition: transform var(--olloa-dur-fast) var(--olloa-ease-out), background-color var(--olloa-dur-fast) var(--olloa-ease-out);
}
.fj-rating__btn:hover { background: var(--olloa-sunken); }
.fj-rating__btn:active { transform: scale(0.98); }
.fj-rating__btn.is-chosen { background: var(--olloa-ink); border-color: transparent; color: var(--olloa-on-ink); }
.fj-rating__btn.is-chosen .fj-rating__next { color: inherit; }
.fj-rating__label { font-size: var(--olloa-text-body); font-weight: var(--olloa-weight-strong); }
.fj-rating__next  { font-size: var(--olloa-text-caption); color: var(--olloa-ink-muted); font-variant-numeric: tabular-nums; }

/* Sticky action bar on phones (holds .fj-rating or the Show answer button).
   On phones .fj-study__main flattens into the .fj-study grid so the bar can
   sit after the context panels and stay pinned above the tab bar. */
.fj-study__main { display: contents; }
.fj-actions {
  order: 1;
  position: sticky;
  bottom: var(--app-tabbar-h);
  z-index: 1;
  margin: 0 calc(-1 * var(--app-gutter));
  padding: var(--olloa-space-3) var(--app-gutter);
  background: var(--olloa-bg);
  border-top: var(--olloa-hairline) solid var(--olloa-border);
}

/* ---------- Panels ---------- */

.fj-panel {
  display: flex;
  flex-direction: column;
  gap: var(--olloa-space-2);
  padding: var(--olloa-space-5);
  border: var(--olloa-hairline) solid var(--app-card-border);
  border-radius: var(--olloa-radius-card);
  background: var(--olloa-surface);
}
.fj-panel__title { font-family: var(--olloa-font-display); font-size: var(--olloa-text-h3); font-weight: var(--olloa-weight-prompt); margin: 0; }

/* ---------- Form fields ---------- */

.fj-input,
.fj-select,
.fj-textarea {
  width: 100%;
  min-height: var(--olloa-tap);
  padding: var(--olloa-space-2) var(--olloa-space-3);
  border: var(--olloa-hairline) solid var(--olloa-border);
  border-radius: var(--olloa-radius-button);
  background: var(--olloa-surface);
  color: var(--olloa-ink);
  font-size: var(--olloa-text-body);
  font-weight: var(--olloa-weight-body);
}
.fj-textarea { resize: vertical; }
.fj-input::placeholder, .fj-textarea::placeholder { color: var(--olloa-ink-muted); }
.fj-input:focus-visible, .fj-select:focus-visible, .fj-textarea:focus-visible { border-color: var(--olloa-ink); }

/* ---------- Mobile tab bar ---------- */

.fj-tabbar {
  position: sticky;
  bottom: 0;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  padding: var(--olloa-space-1) var(--olloa-space-2) calc(var(--olloa-space-1) + env(safe-area-inset-bottom));
  background: var(--olloa-surface);
  border-top: var(--olloa-hairline) solid var(--olloa-border);
}
.fj-tabbar a {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  min-height: 52px;
  font-size: var(--olloa-text-caption);
  color: var(--olloa-ink-muted);
  text-decoration: none;
}
.fj-tabbar a[aria-current="page"] { color: var(--olloa-ink); font-weight: var(--olloa-weight-strong); }
.fj-tabbar svg { width: 24px; height: 24px; }

/* ---------- Theme toggle: ghost icon button ---------- */

.fj-theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--olloa-tap);
  height: var(--olloa-tap);
  border: 0;
  border-radius: var(--olloa-radius-chip);
  background: transparent;
  color: var(--olloa-ink-muted);
}
.fj-theme-toggle:hover { color: var(--olloa-ink); background: var(--olloa-sunken); }

/* Screen-reader-only helper */
.fj-sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ==========================================================================
   Desktop ≥ 768px: two-column study view, top nav, no tab bar
   ========================================================================== */

@media (min-width: 768px) {
  .fj-nav { display: flex; }
  .fj-tabbar { display: none; }
  .fj-chip { padding: var(--olloa-space-1) var(--olloa-space-3); }

  .fj-study {
    grid-template-columns: minmax(0, 1fr) minmax(18rem, 22rem);
    gap: var(--olloa-space-8);
    padding: var(--olloa-space-10) var(--app-gutter);
    align-content: stretch;
  }
  .fj-study__main { display: flex; flex-direction: column; gap: var(--olloa-space-5); min-width: 0; }
  .fj-chip--desk { display: inline-flex; }
  .fj-study__aside { gap: var(--olloa-space-4); }

  .fj-card { flex: 1; min-height: 26rem; padding: var(--olloa-space-14); }

  .fj-actions { order: 0; position: static; margin: 0; padding: 0; background: none; border: 0; }
  .fj-panel { padding: var(--olloa-space-6); }
}