/* ─── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f0f14;
  --surface: #1a1a24;
  --surface2: #22222f;
  --border: #2e2e40;
  --accent: #6c8ef5;
  --accent-dim: #3a4f9e;
  --green: #4ade80;
  --red: #f87171;
  --yellow: #facc15;
  --text: #e8e8f0;
  --text-dim: #8888aa;
  --text-muted: #555570;
  --radius: 10px;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-ja: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ja);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
}

/* ─── Header ─────────────────────────────────────────────────────────────────── */
header {
  width: 100%;
  max-width: 760px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0 20px;
}

.app-title {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
}

#lang-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: border-color 0.15s, color 0.15s;
}
#lang-btn:hover { border-color: var(--accent); color: var(--text); }

/* ─── Main layout ─────────────────────────────────────────────────────────────── */
main {
  width: 100%;
  max-width: 760px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ─── Tab bars ─────────────────────────────────────────────────────────────────── */
.tab-bar {
  display: flex;
  gap: 6px;
  background: var(--surface);
  padding: 6px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.tab-bar button {
  flex: 1;
  padding: 8px 0;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.9rem;
  font-family: inherit;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}
.tab-bar button:hover { background: var(--surface2); color: var(--text); }
.tab-bar button.active {
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

/* ─── Game area ─────────────────────────────────────────────────────────────────── */
.game-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  position: relative;
  min-height: 260px;
}

/* Kana display */
#kana-display {
  font-size: clamp(3rem, 10vw, 5.5rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  min-height: 1.2em;
  text-align: center;
  line-height: 1.1;
}

.char-pending { color: var(--text); }
.char-current { color: var(--yellow); }
.char-done    { color: var(--green); }

/* Meaning / hint */
.word-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-height: 2.5em;
}

#hint-display {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}

#meaning-display {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Input display */
.input-box {
  width: 100%;
  max-width: 480px;
  background: var(--surface2);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  letter-spacing: 0.1em;
  min-height: 54px;
  display: flex;
  align-items: center;
  transition: border-color 0.15s;
}
.input-box:focus-within { border-color: var(--accent); }

.input-correct { color: var(--green); }
.input-partial  { color: var(--yellow); }
.input-wrong   { color: var(--red); text-decoration: underline; }

.cursor {
  display: inline-block;
  color: var(--accent);
  animation: blink 1s step-end infinite;
  margin-left: 1px;
}
@keyframes blink { 50% { opacity: 0; } }

/* Hidden real input */
#input-area {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 1px;
  height: 1px;
  top: 0;
  left: 0;
}

/* ─── Stats bar ─────────────────────────────────────────────────────────────────── */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 600;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

/* ─── Controls ─────────────────────────────────────────────────────────────────── */
.controls {
  display: flex;
  justify-content: center;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px 36px;
  font-size: 1rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  letter-spacing: 0.04em;
}
.btn-primary:hover { background: #7fa0ff; }
.btn-primary:active { transform: scale(0.97); }

/* ─── Overlay (results) ─────────────────────────────────────────────────────────── */
#overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 15, 20, 0.95);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 28px;
  z-index: 10;
}
#overlay.hidden { display: none; }

.results-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.new-hs {
  color: var(--yellow);
  font-weight: 700;
  font-size: 1.1rem;
  animation: pulse 0.8s ease-in-out infinite alternate;
}
@keyframes pulse { from { opacity: 0.7; } to { opacity: 1; } }

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 28px;
  width: 100%;
  max-width: 320px;
}

.result-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: var(--surface2);
  border-radius: 8px;
  padding: 12px;
}

.result-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 600;
}

.result-value {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
}

/* ─── Ready hint ─────────────────────────────────────────────────────────────────── */
.ready-hint {
  position: absolute;
  bottom: 16px;
  left: 0; right: 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  pointer-events: none;
}

/* ─── Mobile keyboard hint ─────────────────────────────────────────────────────── */
.mobile-hint {
  display: none;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
  padding: 6px 0 2px;
}
@media (hover: none) and (pointer: coarse) {
  .mobile-hint { display: block; }
}

/* ─── Footer ─────────────────────────────────────────────────────────────────── */
footer {
  margin-top: 28px;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}
footer a { color: var(--text-dim); text-decoration: none; }
footer a:hover { color: var(--text); }

/* ─── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 520px) {
  .game-card { padding: 24px 16px 20px; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .tab-bar button { font-size: 0.8rem; padding: 8px 4px; }
  #kana-display { font-size: clamp(2.5rem, 14vw, 4rem); }
}