:root {
  --bg: #0c0e14;
  --panel: rgba(22, 26, 38, 0.85);
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8eaef;
  --muted: #8b92a8;
  --accent: #7c6cf0;
  --accent-dim: #5a4fd4;
  --input-bg: #1a2030;
  --input-fg: #e8eaef;
  --input-border: rgba(255, 255, 255, 0.14);
  --chord-bg: #eef1f8;
  --chord-fg: #1a2236;
  --chord-border: rgba(124, 108, 240, 0.4);
  --chord-bg-hover: #ffffff;
  --font: "DM Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(124, 108, 240, 0.22), transparent),
    radial-gradient(ellipse 60% 40% at 90% 80%, rgba(56, 189, 248, 0.12), transparent),
    var(--bg);
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.eyebrow {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 0.5rem;
}

h1 {
  font-size: clamp(2rem, 6vw, 2.75rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: -0.03em;
}

.lead {
  color: var(--muted);
  margin: 0 0 2rem;
  max-width: 52ch;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
  backdrop-filter: blur(12px);
}

.controls label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--muted);
  flex: 1;
  min-width: 140px;
}

.start-fieldset {
  border: none;
  margin: 0 0 1rem;
  padding: 0;
}

.rarity-fieldset {
  border: none;
  margin: 0 0 1rem;
  padding: 0;
}

.start-fieldset legend,
.rarity-fieldset legend {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.rarity-mode {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-bottom: 0.35rem;
}

.mode-option {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--text);
  cursor: pointer;
}

.mode-option input {
  accent-color: var(--accent);
}

.start-hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.75rem;
  max-width: 42ch;
}

.chord-picker {
  padding: 0;
}

.picker-label {
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0 0 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.picker-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
}

.picker-preview {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
}

.vocab-hint {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.8rem;
  color: #e8a87c;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

.mono {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--text);
}

select {
  padding: 0.5rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--input-fg);
  font-family: inherit;
  font-size: 0.95rem;
}

select option {
  background: var(--input-bg);
  color: var(--input-fg);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

button {
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  color: var(--text);
  transition: transform 0.12s, background 0.12s, border-color 0.12s;
}

button:active {
  transform: scale(0.98);
}

/* After generic `button` — chord pills と同系の明背景＋濃文字 */
.chord-picker .picker-btn {
  appearance: none;
  -webkit-appearance: none;
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.35rem 0.55rem;
  border-radius: 8px;
  border: 1px solid var(--chord-border) !important;
  background-color: var(--chord-bg) !important;
  color: var(--chord-fg) !important;
  -webkit-text-fill-color: var(--chord-fg) !important;
  min-width: 2.25rem;
}

.chord-picker .picker-btn:hover {
  background-color: var(--chord-bg-hover) !important;
  border-color: var(--accent) !important;
  color: var(--chord-fg) !important;
  -webkit-text-fill-color: var(--chord-fg) !important;
}

.chord-picker .picker-btn.is-active {
  background-color: var(--accent) !important;
  border-color: var(--accent-dim) !important;
  color: #fff !important;
  -webkit-text-fill-color: #fff !important;
}

.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: #fff;
}
.primary:hover {
  filter: brightness(1.08);
}

.ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}
.ghost:hover {
  color: var(--text);
  border-color: var(--accent);
}

.meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 1rem 0 0;
}

#stats::before {
  content: " · ";
}

.output h2 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin: 0 0 1rem;
  font-weight: 600;
}

.progression {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.35rem;
  min-height: 3rem;
}

.progression.empty {
  color: var(--muted);
  font-size: 0.9rem;
}

.progressions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.prog-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.95rem 0.95rem 0.85rem;
}

.prog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.prog-title {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
}

.chord-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.35rem;
  min-height: 3rem;
}

.play-btn {
  padding: 0.45rem 0.85rem;
  font-size: 0.85rem;
  background: rgba(56, 189, 248, 0.18);
  border: 1px solid rgba(56, 189, 248, 0.45);
  color: var(--text);
}

.play-btn:hover:not(:disabled) {
  background: rgba(56, 189, 248, 0.3);
  border-color: #38bdf8;
}

.play-btn:disabled,
.auto-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.prog-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.auto-btn {
  padding: 0.45rem 0.85rem;
  font-size: 0.85rem;
  background: rgba(124, 108, 240, 0.2);
  border: 1px solid rgba(124, 108, 240, 0.45);
  color: var(--text);
}

.auto-btn:hover:not(:disabled) {
  background: rgba(124, 108, 240, 0.32);
  border-color: var(--accent);
}

.delete-btn {
  padding: 0.45rem 0.85rem;
  font-size: 0.85rem;
}

.empty-state {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.25rem 0;
}

.chord {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.05rem;
  padding: 0.45rem 0.75rem;
  color: var(--chord-fg);
  background: var(--chord-bg);
  border: 1px solid var(--chord-border);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  transition: transform 0.12s, box-shadow 0.12s, background 0.12s, border-color 0.12s;
}

.chord:hover {
  background: var(--chord-bg-hover);
  border-color: var(--accent);
}

.chord.is-playing {
  background: #fff;
  color: var(--accent-dim);
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(124, 108, 240, 0.55), 0 4px 14px rgba(124, 108, 240, 0.35);
  transform: scale(1.06);
}

.chord:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.arrow {
  color: var(--muted);
  font-size: 0.85rem;
  user-select: none;
}

.hints-wrap {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.hints-label {
  font-size: 0.75rem;
  color: var(--muted);
  display: block;
  margin-bottom: 0.5rem;
}

.hints {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.hint {
  font-size: 0.8rem;
  padding: 0.25rem 0.5rem;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 6px;
  color: var(--muted);
}
.hint strong {
  color: var(--text);
  font-family: var(--mono);
  margin-right: 0.25rem;
}

footer {
  font-size: 0.8rem;
  color: var(--muted);
}
footer code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: rgba(255, 255, 255, 0.06);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}