:root {
  --bg: #14171d;
  --panel: #1b1f27;
  --panel-2: #20252e;
  --border: #2c333f;
  --text: #e6e9ef;
  --muted: #8a93a3;
  --accent: #7fb7b0;
  --accent-strong: #5fa39b;
  --accent-ink: #0f1a19;
  --gold: #f2d98c;
  --good: #8fe3b0;
  --warn: #f0cf7a;
  --bad: #ff8a8a;
  --radius: 12px;
  --gutter: 16px;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, 'Hiragino Sans', 'Noto Sans JP', sans-serif;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

h2 {
  margin: 8px 0 12px;
  font-size: 1.25rem;
}

h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--accent);
}

p {
  margin: 0 0 8px;
}

.sim-banner {
  padding: 4px var(--gutter);
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
  background: #4a3a14;
  color: var(--gold);
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 10px var(--gutter);
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
}

.nav {
  display: flex;
  gap: 6px;
}

.nav-btn {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.nav-btn[aria-current='true'] {
  border-color: var(--accent-strong);
  background: var(--panel);
  color: var(--text);
}

.main {
  max-width: 760px;
  margin: 0 auto;
  padding: 8px var(--gutter) 48px;
}

[hidden] {
  display: none !important;
}

.panel {
  margin: 12px 0;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
}

.hint {
  color: var(--muted);
  font-size: 0.875rem;
}

.status {
  min-height: 1.4em;
  margin: 8px 0;
  color: var(--muted);
}

.status.error {
  color: var(--bad);
}

.status.ok {
  color: var(--good);
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 10px 0;
}

.actions .btn {
  flex: 1 1 140px;
}

.btn {
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-2);
  cursor: pointer;
}

.btn:hover:not(:disabled) {
  border-color: var(--accent-strong);
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.btn.primary {
  border-color: var(--accent-strong);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
}

.btn.small {
  min-height: 36px;
  padding: 0 12px;
  font-size: 0.875rem;
}

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

/* 曲リスト */
.song-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.song {
  display: grid;
  gap: 2px;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  text-align: left;
  cursor: pointer;
}

.song.selected {
  border-color: var(--accent);
  background: #1d2a2a;
}

.song-title {
  font-weight: 700;
}

.song-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 12px;
  color: var(--muted);
  font-size: 0.85rem;
}

.song-credit,
.song-note {
  color: var(--muted);
  font-size: 0.8rem;
}

.badge {
  padding: 0 8px;
  border-radius: 999px;
  background: var(--panel-2);
  font-size: 0.75rem;
}

.badge.kind-drill {
  color: var(--accent);
}

.level {
  color: var(--gold);
  letter-spacing: 0.08em;
}

/* フォーム */
.options {
  display: grid;
  gap: 10px;
}

.field {
  display: grid;
  gap: 4px;
  margin: 8px 0;
}

.label {
  font-size: 0.85rem;
  color: var(--muted);
}

.field select,
.field input[type='number'] {
  min-height: 42px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
}

.check {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
}

.check input {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
}

.range {
  display: flex;
  align-items: center;
  gap: 12px;
}

.range input {
  flex: 1;
  accent-color: var(--accent);
}

.value {
  min-width: 4.5em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ゲーム画面 */
.hud {
  display: flex;
  align-items: center;
  gap: 18px;
  margin: 4px 0 8px;
}

.hud-item {
  display: grid;
  line-height: 1.2;
}

.hud-label {
  color: var(--muted);
  font-size: 0.7rem;
}

.hud-value {
  font-size: 1.25rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.hud .btn {
  margin-left: auto;
}

.progress {
  height: 4px;
  margin-bottom: 8px;
  border-radius: 2px;
  background: var(--panel-2);
  overflow: hidden;
}

.progress-fill {
  width: 0;
  height: 100%;
  background: var(--accent);
}

.canvas-wrap {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

#game-canvas {
  display: block;
  width: 100%;
  touch-action: none;
}

/* 結果 */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin: 10px 0;
}

.stat {
  display: grid;
  gap: 2px;
  padding: 10px 6px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
  text-align: center;
}

.stat-label {
  color: var(--muted);
  font-size: 0.72rem;
}

.stat-value {
  font-size: 1.2rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stat.perfect .stat-value {
  color: var(--gold);
}

.stat.great .stat-value {
  color: var(--good);
}

.stat.good .stat-value {
  color: #8fc6ff;
}

.stat.miss .stat-value {
  color: var(--bad);
}

.plain {
  margin: 0;
  padding-left: 1.2em;
}

/* チューナー */
.tuner-main {
  text-align: center;
}

.tuner-name {
  font-size: 4.5rem;
  font-weight: 800;
  line-height: 1.1;
}

.tuner-en {
  min-height: 1.5em;
  color: var(--muted);
  font-size: 1.2rem;
}

.tuner-hz {
  margin-bottom: 14px;
  font-size: 1.1rem;
  font-variant-numeric: tabular-nums;
}

.cent-meter {
  position: relative;
  height: 44px;
  margin: 0 8px 4px;
  border-radius: 8px;
  background: var(--panel-2);
}

.cent-meter .zone {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 45%;
  width: 10%;
  background: rgba(143, 227, 176, 0.22);
}

.needle {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 4px;
  margin-left: -2px;
  border-radius: 2px;
  background: var(--muted);
  transition: left 80ms linear;
}

.needle.good {
  background: var(--good);
}

.needle.warn {
  background: var(--warn);
}

.needle.bad {
  background: var(--bad);
}

.needle.idle {
  opacity: 0.4;
}

.tick {
  position: absolute;
  bottom: -20px;
  color: var(--muted);
  font-size: 0.72rem;
}

.t-neg {
  left: 0;
}

.t-zero {
  left: 50%;
  transform: translateX(-50%);
}

.t-pos {
  right: 0;
}

.tuner-cents {
  min-height: 1.6em;
  margin-top: 24px;
  font-size: 1.3rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.tuner-nearest {
  min-height: 1.5em;
  color: var(--muted);
  font-size: 0.9rem;
}

.input-level {
  height: 8px;
  margin-top: 14px;
  border-radius: 4px;
  background: var(--panel-2);
  overflow: hidden;
}

.level-fill {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--gold));
}

.check-table,
.tine-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin: 0 0 10px;
  padding: 0;
  list-style: none;
}

.check-table li,
.tine-list li {
  display: grid;
  gap: 0;
  padding: 8px 6px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-2);
  text-align: center;
  font-size: 0.85rem;
}

.check-table .deg {
  font-size: 1.2rem;
  font-weight: 700;
}

.check-table .sol {
  color: var(--muted);
  font-size: 0.75rem;
}

.check-table li.good {
  border-color: var(--good);
  color: var(--good);
}

.check-table li.warn {
  border-color: var(--warn);
  color: var(--warn);
}

.check-table li.bad {
  border-color: var(--bad);
  color: var(--bad);
}

.tine-list li {
  color: var(--muted);
}

.tine-list li.done {
  border-color: var(--accent);
  color: var(--text);
}

@media (max-width: 520px) {
  :root {
    --gutter: 14px;
  }

  .tuner-name {
    font-size: 3.6rem;
  }

  .stats,
  .check-table,
  .tine-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .hud {
    gap: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .needle {
    transition: none;
  }
}