/* =========================================================================
   Tabi — design tokens
   Same "field notebook" system as Puzzle Lab (a separate app, but kept
   visually related): system serif for the wordmark, system sans for
   everything else, no external font requests so it looks right offline
   from the very first load.
   ========================================================================= */

:root {
  --color-bg: #eeece1;
  --color-bg-raised: #f7f6ef;
  --color-ink: #1f2420;
  --color-ink-soft: #565f57;
  --color-border: #c9c6b5;
  --color-border-strong: #1f2420;

  --color-accent: #a3402f;      /* vermilion — brand + "good/easy" */
  --color-accent-ink: #f7f6ef;
  --color-present: #b8892c;
  --color-danger: #a3402f;

  --font-display: Georgia, "Iowan Old Style", "Palatino Linotype", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-jp: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", var(--font-body);

  --radius: 6px;
  --nav-height: 64px;
  --header-height: 56px;
  --max-width: 480px;

  color-scheme: light;
}

html.theme-dark {
  --color-bg: #161a17;
  --color-bg-raised: #1e2420;
  --color-ink: #eceae0;
  --color-ink-soft: #a3a99e;
  --color-border: #333b34;
  --color-border-strong: #eceae0;

  --color-accent: #d97f6c;
  --color-accent-ink: #101410;
  --color-present: #d3ac57;
  --color-danger: #d97f6c;

  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior-y: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

button:focus-visible,
[role="switch"]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* =========================================================================
   App shell
   ========================================================================= */

#app {
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  background: var(--color-bg);
}

#offline-banner {
  background: var(--color-ink);
  color: var(--color-bg);
  text-align: center;
  font-size: 0.8rem;
  padding: 6px 12px;
  letter-spacing: 0.02em;
}

#app-header {
  height: var(--header-height);
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0 16px;
  border-bottom: 1px solid var(--color-border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}

.brand__mark {
  color: var(--color-accent);
}

.brand__puzzle-name {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
}

#app-main {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 16px 16px calc(16px + env(safe-area-inset-bottom, 0px));
}

.screen-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 4px 0 16px;
}

#app-nav {
  flex: 0 0 auto;
  height: var(--nav-height);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-raised);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

#app-nav button {
  background: none;
  border: none;
  font-size: 1.3rem;
  color: var(--color-ink-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}

#app-nav button[aria-pressed="true"] {
  color: var(--color-accent);
  position: relative;
}

#app-nav button[aria-pressed="true"]::after {
  content: "";
  position: absolute;
  bottom: 6px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* =========================================================================
   Shared layout blocks (control rows, chips, cards, banners)
   ========================================================================= */

.wordle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.control-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin-bottom: 10px;
}

.chip {
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-raised);
  color: var(--color-ink-soft);
  font-size: 0.82rem;
}

.chip--active {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-bg);
  font-weight: 600;
}

.inline-error {
  margin: 0;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--color-danger);
  color: #fff;
  font-size: 0.85rem;
}

.result-banner {
  text-align: center;
  padding: 12px 16px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  background: var(--color-bg-raised);
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.result-banner__heading {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0;
}

.result-banner__detail {
  margin: 0;
  font-size: 0.88rem;
  color: var(--color-ink-soft);
}

.rules-list {
  list-style: none;
  padding: 0;
  margin: 8px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
  font-size: 0.85rem;
}

.empty-state {
  color: var(--color-ink-soft);
  font-size: 0.88rem;
  margin-top: 4px;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1rem;
  margin: 0 0 10px;
  text-align: center;
}

.btn {
  padding: 12px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border-strong);
  background: var(--color-bg-raised);
  color: var(--color-ink);
  font-size: 0.9rem;
}

.btn--danger {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.settings-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}

/* =========================================================================
   Flashcards
   ========================================================================= */

.flashcard {
  width: 100%;
  max-width: 320px;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 32px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-raised);
  text-align: center;
}

.flashcard__front {
  font-family: var(--font-jp);
  font-size: 2rem;
  margin: 0;
}

.flashcard__reading {
  font-family: var(--font-body);
  font-style: italic;
  color: var(--color-ink-soft);
  margin: 0;
}

.flashcard__back {
  font-size: 1.1rem;
  margin: 0;
}

.grade-btn {
  flex: 1;
}

.grade-btn--again {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.grade-btn--good,
.grade-btn--easy {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* =========================================================================
   Quiz cards
   ========================================================================= */

.quiz-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 360px;
}

.quiz-prompt {
  white-space: pre-line;
  font-size: 1rem;
  line-height: 1.5;
}

/* =========================================================================
   Progress screen
   ========================================================================= */

.stats-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 24px;
}

.stat-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 4px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-raised);
}

.stat-block__value {
  font-family: var(--font-display);
  font-size: 1.5rem;
}

.stat-block__label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  margin-top: 2px;
  text-align: center;
}

.household-table {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.household-row {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  align-items: center;
  gap: 6px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-raised);
  font-size: 0.82rem;
}

.household-row__name {
  font-weight: 600;
}

/* =========================================================================
   Settings screen
   ========================================================================= */

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 4px;
  border-bottom: 1px solid var(--color-border);
}

.settings-label {
  font-size: 0.95rem;
}

.switch {
  width: 44px;
  height: 26px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-raised);
  position: relative;
  transition: background 120ms ease;
}

.switch::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-ink-soft);
  transition: transform 120ms ease;
}

.switch--on {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.switch--on::after {
  background: var(--color-accent-ink);
  transform: translateX(18px);
}

.fatal-error {
  text-align: center;
  padding: 40px 20px;
}

/* =========================================================================
   Responsive
   ========================================================================= */

@media (min-width: 640px) {
  :root {
    --max-width: 560px;
  }
  #app {
    box-shadow: 0 0 0 1px var(--color-border);
    margin-top: 24px;
    margin-bottom: 24px;
    border-radius: 10px;
    overflow: hidden;
    min-height: calc(100% - 48px);
  }
}

@media (min-width: 900px) {
  :root {
    --max-width: 640px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}