:root {
  --bg-1: #f6efe2;
  --bg-2: #d6e6e6;
  --surface: rgba(255, 255, 255, 0.78);
  --ink: #1f2330;
  --muted: #5c657a;
  --accent: #1a7f72;
  --accent-strong: #105a51;
  --border: rgba(31, 35, 48, 0.12);
  --shadow: 0 22px 60px rgba(16, 90, 81, 0.16);
  --transport-cluster-width: 170px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  padding-bottom: 0;
  color: var(--ink);
  background: linear-gradient(125deg, var(--bg-1), var(--bg-2));
  font-family: "Avenir Next", "Gill Sans", "Trebuchet MS", sans-serif;
}

.background-glow {
  position: fixed;
  inset: -20vh -10vw auto;
  height: 70vh;
  background: radial-gradient(circle at center, rgba(26, 127, 114, 0.22), transparent 70%);
  pointer-events: none;
}

.app {
  position: relative;
  z-index: 1;
  width: min(1320px, 97vw);
  margin: 6vh auto;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 24px;
  padding: clamp(1.2rem, 2vw, 2rem);
  backdrop-filter: blur(8px);
}

.card + .card {
  margin-top: 1.2rem;
}

.eyebrow {
  text-transform: uppercase;
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--accent-strong);
  margin: 0 0 0.4rem;
}

h1,
h2 {
  margin: 0 0 0.6rem;
  font-family: "Palatino Linotype", "Book Antiqua", "Times New Roman", serif;
  line-height: 1.1;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

h2 {
  font-size: clamp(1.6rem, 2.8vw, 2.3rem);
}

.subtitle {
  font-size: 1.05rem;
  margin: 0;
}

#landing h1 {
  font-family: "Didot", "Bodoni MT", "Palatino Linotype", serif;
  letter-spacing: 0.01em;
}

#landing .subtitle {
  font-family: "Optima", "Avenir Next", "Gill Sans", "Trebuchet MS", sans-serif;
}

.privacy-note {
  margin: 1.1rem 0 1.4rem;
  color: var(--muted);
}

button {
  border: 0;
  border-radius: 999px;
  font: inherit;
  cursor: pointer;
  transition: transform 120ms ease, filter 120ms ease;
}

button:active {
  transform: translateY(1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.primary-btn,
.secondary-btn,
.ghost-btn {
  padding: 0.72rem 1.15rem;
}

.primary-btn {
  background: linear-gradient(120deg, var(--accent), var(--accent-strong));
  color: #fff;
}

.secondary-btn {
  background: #1f2330;
  color: #fff;
}

.ghost-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--ink);
}

.loading-bar {
  margin-top: 1rem;
  height: 12px;
  border-radius: 999px;
  background: rgba(31, 35, 48, 0.1);
  overflow: hidden;
}

.loading-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), #4dbcae);
}

#loading {
  font-family: "Optima", "Avenir Next", "Gill Sans", "Trebuchet MS", sans-serif;
}

#loading h2 {
  font-family: "Didot", "Bodoni MT", "Palatino Linotype", serif;
  letter-spacing: 0.01em;
}

.playground-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
}

.status-pill {
  padding: 0.42rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.status-pill.live {
  background: rgba(26, 127, 114, 0.12);
  border-color: rgba(26, 127, 114, 0.35);
}

.controls-grid {
  margin-top: 1.2rem;
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.primary-controls {
  margin-top: 1rem;
}

.control-title {
  margin-top: 1.25rem;
}

.section-note {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.control {
  display: grid;
  gap: 0.42rem;
  align-content: start;
}

.control span {
  font-size: 0.92rem;
  color: var(--muted);
}

select,
input[type="range"] {
  width: 100%;
}

select {
  appearance: none;
  border: 1px solid rgba(31, 35, 48, 0.2);
  border-radius: 12px;
  padding: 0.58rem 2.15rem 0.58rem 0.72rem;
  color: var(--ink);
  background-color: rgba(255, 255, 255, 0.88);
  background-image:
    linear-gradient(45deg, transparent 50%, #5c657a 50%),
    linear-gradient(135deg, #5c657a 50%, transparent 50%),
    linear-gradient(to right, rgba(31, 35, 48, 0.12), rgba(31, 35, 48, 0.12));
  background-position:
    calc(100% - 16px) calc(50% - 2px),
    calc(100% - 11px) calc(50% - 2px),
    calc(100% - 2.25rem) 0.28rem;
  background-size:
    5px 5px,
    5px 5px,
    1px calc(100% - 0.56rem);
  background-repeat: no-repeat;
  transition: border-color 120ms ease, box-shadow 120ms ease, background-color 120ms ease;
}

select:hover {
  border-color: rgba(31, 35, 48, 0.32);
}

input[type="range"] {
  appearance: none;
  height: 10px;
  border-radius: 999px;
  border: 1px solid rgba(31, 35, 48, 0.12);
  background: rgba(31, 35, 48, 0.11);
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(26, 127, 114, 0.34), rgba(242, 184, 75, 0.28));
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  margin-top: -5px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.95);
  background: linear-gradient(145deg, #1a7f72, #105a51);
  box-shadow: 0 1px 4px rgba(16, 90, 81, 0.35);
}

input[type="range"]::-moz-range-track {
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(26, 127, 114, 0.34), rgba(242, 184, 75, 0.28));
}

input[type="range"]::-moz-range-progress {
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, #1a7f72, #4dbcae);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.95);
  border-radius: 50%;
  background: linear-gradient(145deg, #1a7f72, #105a51);
  box-shadow: 0 1px 4px rgba(16, 90, 81, 0.35);
}

select:focus-visible,
input[type="range"]:focus-visible {
  outline: none;
  border-color: rgba(26, 127, 114, 0.5);
  box-shadow: 0 0 0 3px rgba(26, 127, 114, 0.16);
}

output {
  justify-self: start;
  min-width: 2.1ch;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-strong);
  border: 1px solid rgba(16, 90, 81, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  padding: 0.1rem 0.45rem;
}

.advanced-panel {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.3rem 0.75rem 0.8rem;
  background: rgba(255, 255, 255, 0.42);
}

.advanced-panel summary {
  cursor: pointer;
  color: var(--muted);
  font-weight: 600;
  padding: 0.55rem 0;
}

.advanced-controls {
  margin-top: 0.3rem;
}

.player-footer {
  position: fixed;
  top: 1rem;
  right: 1rem;
  left: auto;
  bottom: auto;
  width: auto;
  max-width: calc(100vw - 2rem);
  z-index: 999;
  margin: 0;
  padding: 0.45rem 0.52rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(248, 244, 236, 0.92);
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 28px rgba(16, 90, 81, 0.18);
  box-sizing: border-box;
}

.player-footer-inner {
  width: auto;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  gap: 0.38rem;
}

.player-icon-btn {
  width: 46px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  line-height: 0;
}

.player-icon-btn svg {
  width: 20px;
  height: 20px;
  pointer-events: none;
}

.now-playing {
  position: fixed;
  top: 1rem;
  right: calc(1rem + var(--transport-cluster-width) + 0.7rem);
  z-index: 980;
  width: min(520px, calc(100vw - var(--transport-cluster-width) - 2.7rem));
  max-height: calc(100vh - 2rem);
  overflow: auto;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0.72rem;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(244, 249, 247, 0.84)),
    repeating-linear-gradient(90deg, rgba(16, 90, 81, 0.03) 0, rgba(16, 90, 81, 0.03) 1px, transparent 1px, transparent 16px);
  box-shadow: 0 16px 38px rgba(16, 90, 81, 0.16);
  backdrop-filter: blur(10px);
}

.theory-guide {
  margin: 0.55rem 0;
  padding: 0.42rem 0.54rem;
  border: 1px dashed rgba(16, 90, 81, 0.24);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.7);
  font-size: 0.8rem;
  line-height: 1.25;
}

.theory-hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.55rem;
  margin-bottom: 0.55rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
  font-weight: 700;
}

.theory-hud-header-title {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
}

.theory-hud-header-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.36rem;
}

.theory-hud-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(130deg, #1a7f72, #f2b84b);
  box-shadow: 0 0 0 4px rgba(26, 127, 114, 0.14);
}

.theory-hud-inline {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem;
  margin: 0.45rem 0;
}

.theory-hud-item {
  display: grid;
  gap: 0.22rem;
  border: 1px solid rgba(31, 35, 48, 0.1);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.8);
  padding: 0.5rem 0.56rem;
}

.theory-hud-item-hero {
  background: linear-gradient(115deg, rgba(26, 127, 114, 0.11), rgba(255, 255, 255, 0.88));
}

.theory-hud-pill {
  border-radius: 999px;
}

.theory-hud-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: rgba(31, 35, 48, 0.62);
  font-weight: 700;
}

.theory-hud-value {
  font-size: 0.86rem;
  line-height: 1.25;
  color: #243042;
  font-weight: 600;
  word-break: break-word;
}

.theory-hud-section {
  text-transform: capitalize;
}

.theory-hud-countdown {
  font-variant-numeric: tabular-nums;
  color: var(--accent-strong);
}

.theory-hud-toggle {
  padding: 0.32rem 0.66rem;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(255, 255, 255, 0.78);
}

.theory-hud-mini-countdown {
  min-width: 3.85rem;
  text-align: center;
  padding: 0.28rem 0.46rem;
  border: 1px solid rgba(16, 90, 81, 0.24);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

#theory-hud-body {
  display: grid;
  gap: 0.45rem;
}

#theory-hud-body.hidden {
  display: none;
}

.melody-editor {
  margin-top: 1rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.42);
}

.melody-editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}

.melody-editor-header p {
  margin: 0;
}

.melody-editor-toggle {
  padding: 0.42rem 0.8rem;
  white-space: nowrap;
}

#melody-editor-body {
  margin-top: 0.55rem;
}

.melody-editor-toolbar {
  margin-top: 0.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.melody-editor-control {
  min-width: 180px;
  margin: 0;
}

.theory-random-control {
  min-width: 260px;
}

.melody-custom-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
}

.melody-timing-list {
  margin-top: 0.45rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.melody-timing-chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.5rem;
  font-size: 0.78rem;
  background: rgba(255, 255, 255, 0.72);
}

.piano-roll-wrap {
  margin-top: 0.55rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow-x: auto;
  overflow-y: hidden;
  height: min(84vh, 760px);
  min-height: 700px;
  max-height: 760px;
  background: rgba(255, 255, 255, 0.65);
}

.piano-roll {
  --roll-cell-size: 17px;
  min-width: calc(56px + (64 * var(--roll-cell-size)) + 63px);
}

.piano-roll-row {
  display: grid;
  grid-template-columns: 56px 1fr;
  border-bottom: 1px solid rgba(31, 35, 48, 0.06);
}

.piano-roll-row:last-child {
  border-bottom: 0;
}

.piano-roll-note-label {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  border-right: 1px solid rgba(31, 35, 48, 0.08);
  background: rgba(245, 245, 245, 0.8);
  color: #2f384a;
}

.piano-roll-note-label.black {
  background: rgba(209, 221, 226, 0.85);
}

.piano-roll-step-grid {
  display: grid;
  grid-template-columns: repeat(64, var(--roll-cell-size));
  gap: 1px;
  background: rgba(31, 35, 48, 0.1);
}

.piano-roll-cell {
  width: var(--roll-cell-size);
  height: var(--roll-cell-size);
  border: 0;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.88);
  padding: 0;
  transition: background-color 80ms linear;
}

.piano-roll-cell.generated {
  background: rgba(26, 127, 114, 0.16);
}

.piano-roll-cell.generated-hold {
  background: rgba(26, 127, 114, 0.1);
}

.piano-roll-cell.active {
  background: #1a7f72;
}

.piano-roll-cell.hold {
  background: rgba(26, 127, 114, 0.72);
}

.piano-roll-cell.barline {
  box-shadow: inset -1px 0 0 rgba(31, 35, 48, 0.18);
}

.piano-roll-cell.playhead {
  box-shadow: inset 0 0 0 1px #f2b84b;
}

.melody-editor-help {
  margin: 0.4rem 0 0;
  font-size: 0.84rem;
}

.element-meters {
  margin-top: 1rem;
  color: var(--muted);
}

.meter-grid {
  margin-top: 0.55rem;
  display: grid;
  gap: 0.42rem;
}

.meter-row {
  display: grid;
  grid-template-columns: 68px 1fr 40px;
  gap: 0.5rem;
  align-items: center;
}

.meter-track {
  height: 10px;
  border-radius: 999px;
  background: rgba(31, 35, 48, 0.12);
  overflow: hidden;
  border: 1px solid rgba(31, 35, 48, 0.08);
}

.meter-fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #1a7f72, #f2b84b);
  transition: width 70ms linear;
}

.mute-toggle {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.66);
  color: var(--ink);
  padding: 0;
  line-height: 0;
}

.mute-toggle svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
  pointer-events: none;
}

.mute-toggle[aria-pressed="true"] {
  background: #1f2330;
  color: #fff;
}

.hidden {
  display: none;
}

@media (max-width: 680px) {
  .app {
    margin: 3vh auto;
  }

  .card {
    border-radius: 18px;
  }

  .melody-editor-header {
    flex-wrap: wrap;
  }

  .melody-editor-toggle {
    width: 100%;
  }

  .player-footer {
    top: 0.65rem;
    right: 0.65rem;
    max-width: calc(100vw - 1.3rem);
    padding: 0.4rem 0.48rem;
  }

  .now-playing {
    top: 4.25rem;
    right: 0.65rem;
    width: min(520px, calc(100vw - 1.3rem));
    max-height: calc(100vh - 5rem);
    padding: 0.62rem;
  }

  .theory-hud-inline {
    grid-template-columns: 1fr;
  }

  .player-icon-btn {
    width: 40px;
    height: 40px;
  }

  .piano-roll-wrap {
    overflow-y: auto;
    height: min(56vh, 430px);
    min-height: 320px;
  }

  .piano-roll {
    --roll-cell-size: 14px;
    min-width: calc(56px + (64 * var(--roll-cell-size)) + 63px);
  }
}