:root {
  --bg: #0f131c;
  --panel-bg: #151b28;
  --panel-border: #22304a;
  --text: #e8edf6;
  --text-dim: #8ea0ba;
  --accent: #4d8dff;
  --accent-dim: #1c3a6e;
  --accent-contrast: #06101f;
  --accent2: #38d9c9;
  --track-bg: #22304a;
  --control-bg: #1a2130;
  --control-hover: #1f2738;
  --danger: #ff5d5d;
}

/* ---- Theme presets ---- */
/* :root above is the Steel Blue default; the block below just names it
   explicitly so the theme picker's "steel" selection is self-documenting. */

[data-theme="steel"] {
  --bg: #0f131c;
  --panel-bg: #151b28;
  --panel-border: #22304a;
  --text: #e8edf6;
  --text-dim: #8ea0ba;
  --accent: #4d8dff;
  --accent-dim: #1c3a6e;
  --accent-contrast: #06101f;
  --accent2: #38d9c9;
  --track-bg: #22304a;
  --control-bg: #1a2130;
  --control-hover: #1f2738;
  --danger: #ff5d5d;
}

[data-theme="sunset"] {
  --bg: #14151f;
  --panel-bg: #1b1d2a;
  --panel-border: #2a2d3d;
  --text: #e9eaf0;
  --text-dim: #9497a8;
  --accent: #f5821f;
  --accent-dim: #5c3d1f;
  --accent-contrast: #1a1200;
  --accent2: #3ecf6e;
  --track-bg: #2f3244;
  --control-bg: #262a38;
  --control-hover: #2f3345;
  --danger: #e6544a;
}

[data-theme="midnight"] {
  --bg: #141220;
  --panel-bg: #1c1830;
  --panel-border: #332a4d;
  --text: #ece9f7;
  --text-dim: #a094bd;
  --accent: #9b6bff;
  --accent-dim: #3c2a66;
  --accent-contrast: #140a2e;
  --accent2: #3ecfb0;
  --track-bg: #332a4d;
  --control-bg: #241f3a;
  --control-hover: #2c2649;
  --danger: #ff5c7a;
}

[data-theme="ocean"] {
  --bg: #0e1a1e;
  --panel-bg: #132428;
  --panel-border: #1f3b40;
  --text: #e3f5f2;
  --text-dim: #89b2ac;
  --accent: #17c9c0;
  --accent-dim: #0c4a45;
  --accent-contrast: #062120;
  --accent2: #4fd67a;
  --track-bg: #1f3b40;
  --control-bg: #17282c;
  --control-hover: #1c3237;
  --danger: #ff6b5c;
}

[data-theme="crimson"] {
  --bg: #170f11;
  --panel-bg: #221417;
  --panel-border: #3b1e23;
  --text: #f6e9ea;
  --text-dim: #bd9296;
  --accent: #e63950;
  --accent-dim: #5c1720;
  --accent-contrast: #2b0509;
  --accent2: #f2a33e;
  --track-bg: #3b1e23;
  --control-bg: #26161a;
  --control-hover: #301b20;
  --danger: #ff8a5c;
}

[data-theme="forest"] {
  --bg: #0f150e;
  --panel-bg: #161f15;
  --panel-border: #26361f;
  --text: #e9f1e4;
  --text-dim: #9bb28d;
  --accent: #6cbf4b;
  --accent-dim: #294a1c;
  --accent-contrast: #0c1a08;
  --accent2: #d9c04a;
  --track-bg: #26361f;
  --control-bg: #1c2519;
  --control-hover: #212c1d;
  --danger: #e8654a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(900px 500px at 15% -10%, rgba(255, 255, 255, 0.06), transparent 60%),
    radial-gradient(700px 400px at 100% 0%, rgba(255, 255, 255, 0.03), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

.app-header {
  padding-bottom: 18px;
  margin-bottom: 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.app-header h1 {
  font-size: 1.6rem;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
}

.app-header .subtitle {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.panels {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.panel {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0) 140px),
    var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 20px 20px 22px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 1px 2px rgba(0, 0, 0, 0.2);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.panel-header h2 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 0;
}

.panel-header h2::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* Theme picker */

.theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
}

.theme-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--control-bg);
  border: 2px solid var(--panel-border);
  border-radius: 12px;
  padding: 10px 12px;
  cursor: pointer;
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 600;
  text-align: left;
  transition: border-color 0.15s ease, transform 0.05s ease;
}

.theme-btn:hover { border-color: var(--text-dim); }
.theme-btn:active { transform: scale(0.97); }

.theme-btn.active {
  border-color: var(--accent);
}

.theme-swatch {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--bg) 45%, var(--accent) 45%);
  border: 1px solid var(--panel-border);
}

/* Transport */

.transport {
  display: flex;
  align-items: center;
  gap: 16px;
}

.play-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0) 55%), var(--accent);
  color: var(--accent-contrast);
  border: none;
  border-radius: 999px;
  padding: 12px 22px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  transition: background 0.15s ease, transform 0.05s ease;
}

.play-btn:active { transform: scale(0.97); }

.play-btn[aria-pressed="true"] {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0) 55%), var(--danger);
  color: #fff;
}

.play-icon {
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 7px 0 7px 12px;
  border-color: transparent transparent transparent currentColor;
}

.play-btn[aria-pressed="true"] .play-icon {
  width: 12px;
  height: 12px;
  border-style: none;
  background: currentColor;
  border-radius: 2px;
}

.status {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.status-phase {
  font-weight: 700;
  font-size: 1rem;
}

.status-detail {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.beat-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
  min-height: 14px;
}

.beat-dots .dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--track-bg);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.07);
  transition: background 0.08s ease, transform 0.08s ease;
}

.beat-dots .dot.active {
  background: var(--accent);
  transform: scale(1.15);
}

.beat-dots .dot.accent {
  background: var(--accent2);
}

/* Control rows (sliders) */

.control-row {
  display: grid;
  grid-template-columns: 150px 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--panel-border);
}

.control-row:last-child { border-bottom: none; }

.control-row label {
  font-weight: 700;
  font-size: 0.95rem;
}

.slider-wrap { position: relative; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(to right, var(--accent) 0%, var(--accent) var(--fill, 50%), var(--accent-dim) var(--fill, 50%), var(--accent-dim) 100%);
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #17181f;
  border: 3px solid var(--accent);
  cursor: pointer;
  margin-top: -1px;
}

input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #17181f;
  border: 3px solid var(--accent);
  cursor: pointer;
}

input[type="range"]::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: var(--accent-dim);
}

input[type="range"]::-moz-range-progress {
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
}

.stepper {
  display: flex;
  align-items: center;
  gap: 8px;
}

.step-btn {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: none;
  background: var(--control-bg);
  color: var(--text);
  font-size: 1.1rem;
  cursor: pointer;
  line-height: 1;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.step-btn:hover { background: var(--control-hover); }
.step-btn:active { transform: scale(0.95); }

.value {
  min-width: 34px;
  text-align: center;
  font-weight: 800;
  font-size: 1.1rem;
  padding: 4px 9px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.045);
}

/* Toggle switch */

.control-row--toggle {
  grid-template-columns: 150px auto 1fr;
}

.switch {
  position: relative;
  display: inline-block;
  width: 52px;
  height: 30px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-track {
  position: absolute;
  inset: 0;
  background: var(--track-bg);
  border-radius: 999px;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.25);
  transition: background 0.15s ease;
  display: block;
}

.switch-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  transition: transform 0.15s ease;
}

.switch input:checked + .switch-track {
  background: var(--accent);
}

.switch--green input:checked + .switch-track {
  background: var(--accent2);
}

.switch input:checked + .switch-track .switch-thumb {
  transform: translateX(22px);
}

.switch-state {
  color: var(--text-dim);
  font-weight: 600;
}

/* Select dropdowns */

.control-row--select {
  grid-template-columns: 100px 1fr;
}

.control-row--split {
  grid-template-columns: 100px 1fr 1fr;
  gap: 10px;
}

.select-wrap {
  position: relative;
}

.select-wrap::after {
  content: "";
  position: absolute;
  right: 16px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--text-dim);
  border-bottom: 2px solid var(--text-dim);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  background: var(--control-bg);
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 12px 40px 12px 16px;
  font-size: 0.95rem;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

/* Tab display */

.tab-block { margin-bottom: 18px; }
.tab-block:last-of-type { margin-bottom: 12px; }

.tab-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.tab-block-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-dim);
}

.tab-block-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tab-nav-btn {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  border: none;
  background: var(--control-bg);
  color: var(--text);
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.tab-nav-btn:hover { background: var(--control-hover); }
.tab-nav-btn:active { transform: scale(0.95); }

.tab-variant-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  min-width: 108px;
  text-align: center;
}

.tab-octave-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  border: none;
  border-radius: 7px;
  background: var(--control-bg);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 5px 9px;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.tab-octave-btn:hover { background: var(--control-hover); }
.tab-octave-btn:active { transform: scale(0.95); }

.tab-octave-btn span {
  color: var(--accent);
}

.tab-scroll {
  overflow-x: auto;
  border-radius: 10px;
  background: var(--control-bg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.tab-table {
  border-collapse: collapse;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.85rem;
}

.tab-table th {
  position: sticky;
  left: 0;
  background: var(--control-bg);
  color: var(--text-dim);
  font-weight: 700;
  width: 28px;
  min-width: 28px;
  padding: 4px 0;
  text-align: center;
  border-right: 1px solid var(--panel-border);
}

.tab-cell {
  width: 28px;
  min-width: 28px;
  height: 26px;
  text-align: center;
  color: var(--text);
  transition: background 0.08s ease, color 0.08s ease;
}

.tab-cell.tab-dash {
  color: var(--text-dim);
  opacity: 0.5;
}

.tab-cell.tab-strong:not(.tab-dash) {
  font-weight: 800;
  color: var(--accent);
}

.tab-cell.beat-start {
  border-left: 1px solid var(--panel-border);
}

.tab-cell.active {
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 800;
}

/* Presets */

.preset-row {
  display: flex;
  gap: 10px;
}

.preset-row input[type="text"] {
  flex: 1;
  background: var(--control-bg);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  color: var(--text);
  padding: 10px 14px;
  font-size: 0.9rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.btn-secondary {
  background: var(--control-bg);
  border: 1px solid var(--panel-border);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 18px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.btn-secondary:hover { background: var(--control-hover); }

.preset-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
}

.preset-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--control-bg);
  border-radius: 10px;
  padding: 10px 14px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.preset-item span {
  font-weight: 600;
  font-size: 0.9rem;
}

.preset-item .preset-actions {
  display: flex;
  gap: 8px;
}

.preset-item button {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
}

.preset-item button.load-btn { color: var(--accent); }
.preset-item button.delete-btn:hover { color: var(--danger); }

.preset-empty {
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* Explanation panel */

.panel--note h2 {
  font-size: 0.95rem;
  margin: 0 0 10px;
}

.panel--note ol {
  margin: 0 0 12px;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.6;
}

.panel--note ol strong {
  color: var(--text);
}

.note-small {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.8rem;
  font-style: italic;
}

@media (max-width: 480px) {
  .control-row,
  .control-row--toggle {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .stepper { justify-content: flex-end; }
}