:root {
  --bg-dark: #1e1e1e;
  --bg-medium: #2a2a2a;
  --bg-light: #333;
  --accent: #ebe717;
  --accent-hover: #f5f052;
  --text: #ffffff;
  --text-muted: #aaaaaa;
  --border-color: #444;
  --border-radius: 8px;
  --color-primary: #3D5B58;
  --color-positive: #406B47;
}

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

body {
  font-family: 'Roboto Condensed', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

/* ── Header ── */
.site-header {
  text-align: center;
  margin-bottom: 2rem;
}

.site-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-top: 0.3rem;
}

/* ── Cards ── */
.control-card,
.results-card {
  background: var(--bg-medium);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  margin-bottom: 1.5rem;
}

.control-card {
  padding: 2rem;
}

/* ── BPM Controls ── */
.bpm-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-adjust {
  width: 52px;
  height: 52px;
  background: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--border-radius);
  color: #fff;
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

.btn-adjust:hover {
  background: var(--color-positive);
  border-color: var(--color-positive);
}

.btn-adjust:active {
  transform: scale(0.93);
}

.bpm-field {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

#bpmInput {
  width: 148px;
  font-size: 4rem;
  font-weight: 700;
  text-align: center;
  background: var(--bg-dark);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--accent);
  font-family: 'Roboto Condensed', sans-serif;
  padding: 0.2rem 0.5rem;
  -moz-appearance: textfield;
  transition: border-color 0.15s;
}

#bpmInput::-webkit-inner-spin-button,
#bpmInput::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

#bpmInput:focus {
  outline: none;
  border-color: var(--accent);
}

.bpm-unit {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.btn-tap {
  padding: 0 2rem;
  height: 52px;
  background: var(--accent);
  color: var(--color-primary);
  border: none;
  border-radius: var(--border-radius);
  font-family: 'Roboto Condensed', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 1px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  user-select: none;
}

.btn-tap:hover {
  background: var(--accent-hover);
}

.btn-tap:active {
  transform: scale(0.97);
  background: #fff;
}

.tap-hint {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 0.75rem;
}

kbd {
  display: inline-block;
  padding: 0.1em 0.4em;
  font-size: 0.8em;
  font-family: monospace;
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: 3px;
}

/* ── Settings ── */
.settings-row {
  display: flex;
  gap: 1rem;
  margin-top: 1.75rem;
  flex-wrap: wrap;
  align-items: flex-end;
}

.setting-item {
  flex: 1;
  min-width: 130px;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.setting-item label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
}

.setting-item--timesig {
  flex: 0 0 auto;
  align-items: center;
}

select {
  padding: 0.6rem 0.75rem;
  background: var(--bg-dark);
  color: var(--text);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: 'Roboto Condensed', sans-serif;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23aaa' d='M6 8L0 0h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
  transition: border-color 0.15s;
}

select:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── Time Signature stacked input ── */
.time-sig-input {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  width: 64px;
}

.time-sig-input input[type="number"] {
  width: 100%;
  padding: 0.3rem 0;
  text-align: center;
  font-size: 1.6rem;
  font-weight: 700;
  font-family: 'Roboto Condensed', sans-serif;
  background: transparent;
  border: none;
  color: var(--text);
  -moz-appearance: textfield;
  line-height: 1;
  display: block;
}

.time-sig-input input[type="number"]::-webkit-inner-spin-button,
.time-sig-input input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.time-sig-input input[type="number"]:focus {
  outline: none;
  background: rgba(235, 231, 23, 0.08);
}

.time-sig-divider {
  width: 100%;
  height: 2px;
  background: var(--border-color);
  flex-shrink: 0;
}

/* ── Results Table ── */
.results-card {
  overflow: hidden;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead th {
  position: sticky;
  top: 0;
  background: var(--bg-dark);
  padding: 0.75rem 1rem;
  text-align: right;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  border-bottom: 2px solid var(--border-color);
  white-space: nowrap;
}

thead th.col-division {
  text-align: left;
}

tbody tr {
  border-bottom: 1px solid rgba(68, 68, 68, 0.4);
  transition: background 0.1s;
}

tbody tr:last-child {
  border-bottom: none;
}

/* Row type backgrounds */
tbody tr.row-bar {
  background: rgba(235, 231, 23, 0.07);
}

tbody tr.row-straight:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

tbody tr.row-dotted {
  background: rgba(61, 91, 88, 0.2);
}

tbody tr.row-triplet {
  background: rgba(64, 107, 71, 0.12);
}

tbody tr:hover {
  background: rgba(255, 255, 255, 0.07) !important;
}

tbody td {
  padding: 0.6rem 1rem;
  text-align: right;
  font-family: 'Courier New', 'Courier', monospace;
  font-size: 0.88rem;
  color: var(--text);
  white-space: nowrap;
}

tbody td:first-child {
  text-align: left;
  font-family: 'Roboto Condensed', sans-serif;
}

.div-name {
  font-weight: 700;
  font-size: 0.9rem;
  display: block;
}

.div-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Copy interaction */
.copyable {
  cursor: pointer;
  border-radius: 3px;
  transition: color 0.1s, background 0.1s;
}

.copyable:hover {
  color: var(--accent);
  background: rgba(235, 231, 23, 0.1);
}

.copyable.copied {
  color: #6fcf97;
  background: rgba(111, 207, 151, 0.12);
}

.copy-hint {
  text-align: center;
  padding: 0.65rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  background: var(--bg-dark);
  border-top: 1px solid var(--border-color);
}

/* ── Toast ── */
#toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.55rem 1.25rem;
  font-size: 0.9rem;
  color: var(--text);
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
  z-index: 1000;
  white-space: nowrap;
}

#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Footer ── */
.site-footer {
  margin-top: 2.5rem;
  text-align: center;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s, transform 0.2s;
}

.icon-github {
  width: 1.1rem;
  height: 1.1rem;
}

.footer-link:hover {
  color: var(--accent);
  transform: translateY(-1px);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .site-header h1 {
    font-size: 1.9rem;
  }

  .control-card {
    padding: 1.5rem 1rem;
  }

  #bpmInput {
    font-size: 3rem;
    width: 110px;
  }

  .bpm-unit {
    font-size: 1rem;
  }

  .btn-adjust {
    width: 44px;
    height: 44px;
  }

  .btn-tap {
    height: 44px;
    padding: 0 1.5rem;
  }

  tbody td {
    padding: 0.55rem 0.75rem;
    font-size: 0.82rem;
  }

  thead th {
    padding: 0.65rem 0.75rem;
  }
}