/* nihongo Pack 1 — shared styles
   Mobile-first. Neutral palette. Noto Sans JP for kana. */

:root {
  --bg:           #f7f5f0;
  --surface:      #ffffff;
  --surface-alt:  #efebe2;
  --ink:          #1f1d1a;
  --ink-soft:     #5a564f;
  --ink-faint:    #9a958a;
  --accent:       #c2410c;       /* warm rust — same family as the music studio */
  --accent-soft:  #fed7aa;
  --good:         #15803d;
  --good-soft:    #bbf7d0;
  --bad:          #b91c1c;
  --bad-soft:     #fecaca;
  --warn:         #a16207;
  --warn-soft:    #fef3c7;
  --line:         #d6d1c4;
  --radius:       10px;
  --shadow:       0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
  --font-ui:      'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-jp:      'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
}

/* ── Header ────────────────────────────────────────────────────── */
.lesson-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}
.lesson-header .pack-tag {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 600;
}
.lesson-header a { color: var(--ink-soft); text-decoration: none; font-size: 0.9rem; }
.lesson-header a:hover { color: var(--accent); }

h1 {
  font-size: 1.8rem;
  margin: 0.2rem 0 0.6rem;
  font-weight: 700;
}
h2 {
  font-size: 1.3rem;
  margin-top: 2.2rem;
  margin-bottom: 0.8rem;
  font-weight: 600;
}
h3 { font-size: 1.05rem; margin-top: 1.4rem; font-weight: 600; }

p { margin: 0.6rem 0; color: var(--ink-soft); }
p.intro { color: var(--ink); font-size: 1.05rem; }

/* ── Kana grid ────────────────────────────────────────────────── */
.kana-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0.9rem;
  margin: 1rem 0 1.5rem;
}
.kana-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.9rem;
  text-align: center;
  position: relative;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.kana-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 2px 6px rgba(0,0,0,0.08), 0 8px 18px rgba(0,0,0,0.06);
}
.kana-card.irregular {
  border-color: var(--warn);
  background: linear-gradient(180deg, var(--surface) 0%, var(--warn-soft) 100%);
}
.kana-card .glyph {
  font-family: var(--font-jp);
  font-size: 3.2rem;
  font-weight: 500;
  line-height: 1;
  margin: 0.2rem 0 0.4rem;
  color: var(--ink);
}
.kana-card .romaji {
  font-size: 1.05rem;
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.kana-card .mnemonic {
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-top: 0.5rem;
  min-height: 2.4em;
  font-style: italic;
}
.kana-card .audio-btn {
  margin-top: 0.6rem;
  background: var(--surface-alt);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: var(--font-ui);
  color: var(--ink);
  transition: background 0.12s, border-color 0.12s;
}
.kana-card .audio-btn:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.kana-card .audio-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.kana-card .irregular-flag {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  font-size: 0.65rem;
  background: var(--warn);
  color: #fff;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* ── Drill / quiz ─────────────────────────────────────────────── */
.drill, .quiz {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
  margin: 1rem 0;
  box-shadow: var(--shadow);
}
.drill .prompt-glyph,
.quiz .prompt-glyph {
  font-family: var(--font-jp);
  font-size: 4rem;
  font-weight: 500;
  text-align: center;
  margin: 0.6rem 0 1rem;
  color: var(--ink);
  line-height: 1;
}
.drill input[type=text],
.quiz input[type=text] {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-size: 1.1rem;
  font-family: var(--font-ui);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  text-align: center;
  letter-spacing: 0.06em;
  color: var(--ink);
}
.drill input:focus,
.quiz input:focus {
  outline: none;
  border-color: var(--accent);
}
.drill input.correct,
.quiz input.correct {
  border-color: var(--good);
  background: var(--good-soft);
}
.drill input.wrong,
.quiz input.wrong {
  border-color: var(--bad);
  background: var(--bad-soft);
}

.drill-progress, .quiz-progress {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}
.drill-feedback, .quiz-feedback {
  margin-top: 0.7rem;
  text-align: center;
  font-size: 0.95rem;
  min-height: 1.4em;
  color: var(--ink-soft);
}
.drill-feedback.correct, .quiz-feedback.correct { color: var(--good); }
.drill-feedback.wrong,   .quiz-feedback.wrong   { color: var(--bad); }

button.primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 0.7rem 1.3rem;
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 0.7rem;
  transition: opacity 0.12s, transform 0.12s;
}
button.primary:hover { opacity: 0.92; }
button.primary:active { transform: translateY(1px); }
button.primary:disabled { opacity: 0.45; cursor: not-allowed; }

/* ── Quiz result badge ─────────────────────────────────────────── */
.result-badge {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius);
  font-weight: 600;
  margin-top: 0.8rem;
}
.result-badge.passed {
  background: var(--good-soft);
  color: var(--good);
  border: 1px solid var(--good);
}
.result-badge.failed {
  background: var(--bad-soft);
  color: var(--bad);
  border: 1px solid var(--bad);
}

/* ── Reading drill (Lesson 4) ─────────────────────────────────── */
.reading-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.7rem;
}
.reading-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.9rem;
  box-shadow: var(--shadow);
  cursor: pointer;
  text-align: center;
  user-select: none;
  transition: background 0.12s;
}
.reading-card:hover { background: var(--surface-alt); }
.reading-card .word {
  font-family: var(--font-jp);
  font-size: 1.8rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
}
.reading-card .reveal {
  font-size: 0.8rem;
  color: var(--ink-faint);
  margin-top: 0.3rem;
}
.reading-card.revealed .reveal { display: none; }
.reading-card .answer {
  display: none;
  margin-top: 0.4rem;
}
.reading-card.revealed .answer { display: block; }
.reading-card .answer .romaji-text {
  color: var(--accent);
  font-weight: 600;
}
.reading-card .answer .meaning-text {
  color: var(--ink-soft);
  font-size: 0.88rem;
  margin-top: 0.2rem;
}

/* ── Pack & root index pages ──────────────────────────────────── */
.lesson-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.lesson-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--ink);
  display: block;
  transition: transform 0.12s, box-shadow 0.12s;
}
.lesson-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 2px 6px rgba(0,0,0,0.08), 0 8px 20px rgba(0,0,0,0.07);
  border-color: var(--accent);
}
.lesson-card .num {
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.lesson-card .title {
  font-size: 1.15rem;
  margin: 0.3rem 0;
  font-weight: 600;
}
.lesson-card .meta {
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.lesson-card .start {
  display: inline-block;
  margin-top: 0.7rem;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}

/* ── Footer / next link ───────────────────────────────────────── */
.lesson-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  margin-top: 2.2rem;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.lesson-footer a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.lesson-footer a:hover { text-decoration: underline; }

/* ── Notes / callouts ─────────────────────────────────────────── */
.note {
  background: var(--warn-soft);
  border-left: 3px solid var(--warn);
  padding: 0.7rem 0.9rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1rem 0;
  font-size: 0.9rem;
  color: var(--ink);
}
.note strong { color: var(--warn); }

/* ── KanaKeyboard widget (issue #1) ──────────────────────────── */
body.has-kana-keyboard { padding-bottom: 250px; }

.kana-keyboard {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--surface);
  border-top: 2px solid var(--line);
  box-shadow: 0 -4px 16px rgba(0,0,0,0.08);
  padding: 0.6rem 0.8rem 0.8rem;
  font-family: var(--font-ui);
  transition: transform 0.2s ease;
}
.kana-keyboard.collapsed {
  transform: translateY(calc(100% - 38px));
}
.kana-keyboard.collapsed .kbd-body { opacity: 0.3; pointer-events: none; }

.kbd-header {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}
.kbd-title {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.kbd-caption {
  flex: 1;
  font-size: 0.85rem;
  color: var(--ink);
  font-family: var(--font-jp), var(--font-ui);
  min-width: 0;
}
.kbd-toggle {
  background: var(--surface-alt);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.25rem 0.7rem;
  font-size: 0.78rem;
  cursor: pointer;
  font-family: var(--font-ui);
  color: var(--ink-soft);
}
.kbd-toggle:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--ink); }

.kbd-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
}
.kbd-row {
  display: flex;
  gap: 4px;
  justify-content: center;
}
/* Indent rows progressively (Q row, A row, Z row) like a real keyboard */
.kbd-row:nth-child(2) { margin-left: 18px; }
.kbd-row:nth-child(3) { margin-left: 30px; }
.kbd-row:nth-child(4) { margin-left: 50px; }

.kbd-key {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-ui);
  padding: 2px;
  transition: background 0.12s, border-color 0.12s, transform 0.1s;
  user-select: none;
}
.kbd-key:hover {
  background: var(--surface-alt);
  border-color: var(--ink-soft);
}
.kbd-key.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: translateY(-1px) scale(1.03);
  box-shadow: 0 2px 8px rgba(194, 65, 12, 0.4);
}
.kbd-key.active.shift-active {
  /* Shift-required key — slight different tint to signal "hold shift first" */
  background: linear-gradient(135deg, var(--accent) 0%, #9a3412 100%);
}

.kbd-key-label {
  font-size: 0.62rem;
  color: var(--ink-faint);
  font-weight: 600;
  line-height: 1;
}
.kbd-key.active .kbd-key-label { color: rgba(255,255,255,0.75); }

.kbd-key-kana {
  font-family: var(--font-jp);
  font-size: 1rem;
  line-height: 1.1;
  color: var(--ink);
  font-weight: 500;
}
.kbd-key.active .kbd-key-kana { color: #fff; }

.kbd-key-kana-shift {
  position: absolute;
  bottom: 1px;
  right: 3px;
  font-family: var(--font-jp);
  font-size: 0.55rem;
  color: var(--ink-faint);
  line-height: 1;
}
.kbd-key.active .kbd-key-kana-shift { color: rgba(255,255,255,0.7); }

.kbd-seq-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  background: var(--ink);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 999px;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

/* ── Responsive tweaks ────────────────────────────────────────── */
@media (max-width: 540px) {
  h1 { font-size: 1.5rem; }
  .kana-card .glyph { font-size: 2.6rem; }
  .container { padding: 1rem 0.7rem 3rem; }
  /* Keyboard shrinks for phones */
  body.has-kana-keyboard { padding-bottom: 220px; }
  .kbd-key { width: 28px; height: 32px; }
  .kbd-key-kana { font-size: 0.78rem; }
  .kbd-key-label { font-size: 0.5rem; }
  .kbd-key-kana-shift { font-size: 0.45rem; }
  .kbd-row:nth-child(2) { margin-left: 10px; }
  .kbd-row:nth-child(3) { margin-left: 16px; }
  .kbd-row:nth-child(4) { margin-left: 28px; }
  .kbd-caption { font-size: 0.78rem; }
}