*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #fdf6ec;
  color: #4a4540;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 16px;
}

.container {
  width: 100%;
  max-width: 700px;
  background: #fffef9;
  border-radius: 20px;
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
  padding: 32px 28px 24px;
  transition: background 0.4s;
}

.container.correct { background: #eaf5ea; }
.container.wrong   { background: #fdf0f0; }

.header-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 4px;
}

h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: #6b5e4a;
  margin: 0;
}

.subtitle {
  text-align: center;
  font-size: 0.85rem;
  color: #a09888;
  margin-bottom: 10px;
}

/* ── mode toggle ── */
.mode-toggle {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-bottom: 16px;
}

.mode-btn {
  padding: 5px 16px;
  font-size: 0.8rem;
  font-family: inherit;
  border: 1px solid #d4cbb5;
  background: #fffef9;
  color: #8b7e6a;
  cursor: pointer;
  transition: all 0.2s;
}

.mode-btn:first-child { border-radius: 8px 0 0 8px; }
.mode-btn:last-child  { border-radius: 0 8px 8px 0; }

.mode-btn.active {
  background: #d4cbb5;
  color: #4a4540;
  font-weight: 500;
}

.mode-btn:hover:not(.active) { background: #ede6d6; }

/* ── timer ── */
.timer-wrap {
  height: 6px;
  background: #e8e2d5;
  border-radius: 3px;
  margin-bottom: 20px;
  overflow: hidden;
}

.timer-bar {
  height: 100%;
  width: 100%;
  background: #c4b89e;
  border-radius: 3px;
  transition: width 0.1s linear, background 0.3s;
}

.timer-bar.warn { background: #d4a08a; }

/* ── main layout ── */
.main {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: center;
}

/* ── staff ── */
.staff-panel {
  flex: 0 0 auto;
  background: #fffef9;
  border: 1px solid #e8e2d5;
  border-radius: 12px;
  padding: 12px 8px 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 260px;
}

.staff-panel svg { display: block; max-width: 100%; height: auto; }

/* ── answer panel ── */
.answer-panel {
  flex: 0 0 240px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.answer-panel label {
  font-size: 0.9rem;
  font-weight: 500;
  color: #6b5e4a;
}

.answer-panel input {
  width: 100%;
  padding: 10px 14px;
  font-size: 1.05rem;
  border: 2px solid #e0d8c8;
  border-radius: 10px;
  background: #fffef9;
  color: #4a4540;
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
}

.answer-panel input:focus { border-color: #c4b89e; }

.btn {
  width: 100%;
  padding: 10px 0;
  font-size: 0.95rem;
  font-weight: 500;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s;
  font-family: inherit;
  background: #e0d8c8;
  color: #4a4540;
}

.btn:hover { background: #d4cbb5; }
.btn:active { transform: scale(0.98); }

/* ── feedback ── */
.feedback {
  text-align: center;
  font-size: 0.95rem;
  min-height: 1.4em;
  line-height: 1.4;
  color: #8b7e6a;
}

.feedback.correct-msg { color: #5a8a5a; font-weight: 500; }
.feedback.wrong-msg   { color: #b06060; font-weight: 500; }

/* ── score bar ── */
.score-bar {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-top: 18px;
  font-size: 0.85rem;
  color: #8b7e6a;
}

.score-bar span { font-weight: 600; color: #4a4540; }

.hint {
  font-size: 0.75rem;
  color: #b8a88a;
  margin-top: 3px;
  line-height: 1.4;
}

/* ── gear button ── */
.gear-btn {
  padding: 4px 12px;
  border-radius: 14px;
  border: 1px solid #d4cbb5;
  background: #fffef9;
  font-size: 0.8rem;
  font-family: inherit;
  cursor: pointer;
  color: #8b7e6a;
  flex-shrink: 0;
  transition: background 0.2s;
}

.gear-btn:hover { background: #ede6d6; }

/* ── settings overlay ── */
.settings-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.25);
  z-index: 200;
  justify-content: center;
  align-items: center;
  padding: 16px;
}

.settings-overlay.open { display: flex; }

.settings-panel {
  background: #fffef9;
  border-radius: 16px;
  box-shadow: 0 4px 32px rgba(0,0,0,0.12);
  padding: 24px 28px 20px;
  width: 100%;
  max-width: 440px;
  max-height: 90vh;
  overflow-y: auto;
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.settings-header h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: #6b5e4a;
}

.settings-close {
  width: 30px;
  height: 30px;
  border: none;
  background: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: #a09888;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.settings-close:hover { background: #ede6d6; }

/* ── setting groups ── */
.setting-group {
  margin-bottom: 16px;
}

.setting-title {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: #6b5e4a;
  margin-bottom: 8px;
}

/* key checkboxes */
.key-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.key-chip {
  padding: 4px 10px;
  font-size: 0.8rem;
  border: 1px solid #d4cbb5;
  border-radius: 14px;
  background: #fffef9;
  color: #8b7e6a;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.key-chip.active {
  background: #d4cbb5;
  color: #4a4540;
  font-weight: 500;
  border-color: #c4b89e;
}

.key-chip:hover:not(.active) { background: #ede6d6; }

/* quick-select buttons */
.quick-selects {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
}

.qs-btn {
  padding: 3px 10px;
  font-size: 0.72rem;
  border: 1px solid #e0d8c8;
  border-radius: 10px;
  background: #fffef9;
  color: #a09888;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.qs-btn:hover { background: #ede6d6; color: #6b5e4a; }

/* note grid — 7 rows × 4 cols (label + nat + sharp + flat) */
.note-grid {
  display: grid;
  grid-template-columns: 36px repeat(3, 1fr);
  gap: 4px 6px;
  align-items: center;
}

.note-row-label {
  font-size: 0.82rem;
  font-weight: 500;
  color: #6b5e4a;
  text-align: right;
  padding-right: 4px;
}

.note-toggle {
  padding: 4px 0;
  font-size: 0.75rem;
  border: 1px solid #e0d8c8;
  border-radius: 8px;
  background: #fffef9;
  color: #a09888;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
  text-align: center;
}

.note-toggle.active {
  background: #c4b89e;
  color: #4a4540;
  border-color: #b8a88a;
  font-weight: 500;
}

.note-toggle:hover:not(.active) { background: #ede6d6; }

.note-col-header {
  font-size: 0.7rem;
  color: #a09888;
  text-align: center;
}

/* range & number inputs */
.range-row, .timer-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.num-input {
  width: 56px;
  padding: 6px 8px;
  font-size: 0.9rem;
  border: 2px solid #e0d8c8;
  border-radius: 8px;
  background: #fffef9;
  color: #4a4540;
  text-align: center;
  font-family: inherit;
  outline: none;
}

.num-input:focus { border-color: #c4b89e; }

.range-sep { color: #a09888; }

.timer-hint { font-size: 0.8rem; color: #a09888; }

/* toggle row (checkbox) */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: #4a4540;
  cursor: pointer;
}

.toggle-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: #c4b89e;
}

/* settings actions */
.settings-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.btn-secondary {
  background: #fffef9;
  border: 1px solid #e0d8c8;
}

.btn-secondary:hover { background: #ede6d6; }

/* ── responsive ── */
@media (max-width: 600px) {
  .main { flex-direction: column; gap: 16px; }
  .staff-panel { min-width: 0; width: 100%; }
  .answer-panel { flex: 0 0 auto; width: 100%; }
  .container { padding: 20px 16px 18px; }
}