/* ─── Reset & base ──────────────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

[hidden] {
  display: none !important;
}

:root {
  --bg: #080a14;
  --surface: rgba(255, 255, 255, 0.04);
  --surface2: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.09);
  --border2: rgba(255, 255, 255, 0.14);
  --text: #e8eaf6;
  --muted: rgba(232, 234, 246, 0.45);
  --accent: #7c6df5;
  --accent2: #46d9b5;
  --accent3: #f5a623;
  --danger: #ef5350;
  --ok: #66bb6a;
  --warn: #ffa726;
  --radius: 18px;
  --radius-sm: 10px;
  --card: rgba(14, 16, 32, 0.75);
  --piano-white: #f2f2ef;
  --piano-black: #1c1c24;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ─── Ambient orbs ──────────────────────────────────────────────────────────── */
.bg-orbs {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.22;
  animation: floatOrb 18s ease-in-out infinite alternate;
}

.orb-1 {
  width: 560px;
  height: 560px;
  background: #3d30c8;
  top: -200px;
  left: -180px;
  animation-duration: 20s;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: #0f8f85;
  top: 25%;
  right: -140px;
  animation-duration: 24s;
}

.orb-3 {
  width: 320px;
  height: 320px;
  background: #7b1fa2;
  bottom: -80px;
  left: 35%;
  animation-duration: 16s;
}

@keyframes floatOrb {
  from {
    transform: translate(0, 0) scale(1);
  }

  to {
    transform: translate(30px, 25px) scale(1.06);
  }
}

/* ─── Header ────────────────────────────────────────────────────────────────── */
.app-header {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 44px 24px 10px;
}

.logo {
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, #a89cf7 20%, #46d9b5 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 5px;
}

/* ─── Settings bar ──────────────────────────────────────────────────────────── */
.settings-bar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  padding: 12px 20px;
  max-width: 960px;
  width: 100%;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(24px);
}

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

.setting-group label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.setting-group select,
.settings-bar select {
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--text);
  border-radius: 8px;
  padding: 5px 10px;
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

.setting-group select:hover {
  border-color: var(--accent);
}

/* Do toggle */
.toggle-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--muted);
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
}

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

.slider {
  position: absolute;
  inset: 0;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.12);
  cursor: pointer;
  transition: background 0.25s;
}

.slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  bottom: 3px;
  left: 3px;
  background: #fff;
  transition: transform 0.25s;
}

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

.toggle-switch input:checked+.slider::before {
  transform: translateX(18px);
}

/* ─── Main ──────────────────────────────────────────────────────────────────── */
main {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 960px;
  padding: 20px 16px 60px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* ─── Library panel ─────────────────────────────────────────────────────────── */
.library-panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  backdrop-filter: blur(24px);
}

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

.library-header h2 {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
}

.btn-add {
  padding: 6px 14px;
  border-radius: 99px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--accent2);
  font-family: 'Inter', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.btn-add:hover {
  background: rgba(70, 217, 181, 0.12);
  transform: scale(1.03);
}

.exercise-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.exercise-card {
  position: relative;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
  min-width: 118px;
}

.exercise-card:hover {
  border-color: var(--accent);
  background: var(--surface2);
  transform: translateY(-1px);
}

.exercise-card.selected {
  border-color: var(--accent2);
  background: rgba(70, 217, 181, 0.1);
  box-shadow: 0 0 16px rgba(70, 217, 181, 0.2);
}

.ex-name {
  font-size: 0.82rem;
  font-weight: 700;
}

.ex-preview {
  font-size: 0.72rem;
  color: var(--muted);
  font-family: 'Space Mono', monospace;
  margin-top: 3px;
}

.ex-delete {
  position: absolute;
  top: 6px;
  right: 7px;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 0.72rem;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.2s, background 0.2s;
}

.ex-delete:hover {
  color: var(--danger);
  background: rgba(239, 83, 80, 0.1);
}

/* ─── Exercise stage ────────────────────────────────────────────────────────── */
.exercise-stage {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 24px 20px;
  backdrop-filter: blur(24px);
}

.stage-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 18px;
}

.stage-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.stage-key {
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent2);
}

/* Note chips */
.note-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  min-height: 76px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.note-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 16px;
  border-radius: 14px;
  background: var(--surface);
  border: 2px solid var(--border);
  transition: border-color 0.25s, background 0.25s, box-shadow 0.25s, transform 0.15s;
  user-select: none;
}

.chip-sol {
  font-size: 1.1rem;
  font-weight: 900;
}

.chip-sci {
  font-size: 0.68rem;
  font-family: 'Space Mono', monospace;
  color: var(--muted);
  margin-top: 2px;
}

.chip-pct {
  font-size: 0.7rem;
  font-weight: 700;
  margin-top: 4px;
}

.chip-target {
  border-color: var(--accent3);
  background: rgba(245, 166, 35, 0.13);
  box-shadow: 0 0 18px rgba(245, 166, 35, 0.3);
  transform: scale(1.06);
}

.chip-target .chip-sol {
  color: var(--accent3);
}

.chip-correct {
  border-color: var(--ok);
  background: rgba(102, 187, 106, 0.12);
  box-shadow: 0 0 14px rgba(102, 187, 106, 0.25);
}

.chip-correct .chip-sol {
  color: var(--ok);
}

.chip-correct .chip-pct {
  color: var(--ok);
}

.chip-close {
  border-color: var(--warn);
  background: rgba(255, 167, 38, 0.1);
  box-shadow: 0 0 12px rgba(255, 167, 38, 0.2);
}

.chip-close .chip-sol {
  color: var(--warn);
}

.chip-close .chip-pct {
  color: var(--warn);
}

.chip-wrong {
  border-color: var(--danger);
  background: rgba(239, 83, 80, 0.1);
}

.chip-wrong .chip-sol {
  color: var(--danger);
}

.chip-wrong .chip-pct {
  color: var(--danger);
}

/* Transport controls */
.stage-controls {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.btn-transport {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 26px;
  border-radius: 99px;
  border: none;
  font-family: 'Inter', sans-serif;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, opacity 0.2s;
}

.btn-transport:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-play {
  background: linear-gradient(135deg, #6c5ce7, #46d9b5);
  color: #fff;
  box-shadow: 0 5px 22px rgba(108, 92, 231, 0.4);
}

.btn-play:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(70, 217, 181, 0.4);
}

.btn-play.btn-active {
  animation: pulseBtn 1.4s ease-in-out infinite;
}

.btn-sing {
  background: linear-gradient(135deg, #e91e63, #f06292);
  color: #fff;
  box-shadow: 0 5px 22px rgba(240, 98, 146, 0.35);
}

.btn-sing:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(240, 98, 146, 0.5);
}

.btn-sing.btn-active {
  animation: pulseBtn 1.4s ease-in-out infinite;
}

.btn-reset {
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--muted);
}

.btn-reset:not(:disabled):hover {
  background: var(--surface2);
  color: var(--text);
  transform: rotate(-8deg);
}

@keyframes pulseBtn {

  0%,
  100% {
    box-shadow: 0 5px 22px rgba(108, 92, 231, 0.45);
  }

  50% {
    box-shadow: 0 6px 40px rgba(108, 92, 231, 0.78);
  }
}

/* Status message */
.status-msg {
  font-size: 0.82rem;
  color: var(--muted);
  min-height: 1.2em;
}

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

/* ─── Timeseries ────────────────────────────────────────────────────────────── */
.timeseries-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  backdrop-filter: blur(20px);
}

.ts-label {
  padding: 10px 16px 0;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
}

.ts-canvas-wrap {
  padding: 4px 0 0;
}

#timeseriesCanvas {
  display: block;
  width: 100%;
}

/* ─── Piano ─────────────────────────────────────────────────────────────────── */
.piano-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 14px;
  backdrop-filter: blur(20px);
}

.piano-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 4px;
}

.piano-scroll::-webkit-scrollbar {
  height: 4px;
}

.piano-scroll::-webkit-scrollbar-thumb {
  background: var(--border2);
  border-radius: 4px;
}

.piano-keyboard {
  position: relative;
  user-select: none;
  cursor: pointer;
}

.piano-legend {
  margin-top: 8px;
  font-size: 0.7rem;
  color: var(--muted);
  text-align: center;
}

/* Key styles */
.piano-key {
  position: absolute;
  border-radius: 0 0 6px 6px;
  transition: filter 0.1s, background 0.1s;
  cursor: pointer;
}

.white-key {
  background: var(--piano-white);
  border: 1px solid #bbb;
  border-top: none;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.35), inset 0 -2px 4px rgba(0, 0, 0, 0.1);
}

.white-key:hover {
  background: #fff;
  filter: brightness(1.05);
}

.black-key {
  background: var(--piano-black);
  border: 1px solid #000;
  border-top: none;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.6), inset 0 -2px 4px rgba(0, 0, 0, 0.3);
}

.black-key:hover {
  background: #2c2c38;
}

/* Highlight states */
.piano-key.key-playing {
  background: #a89cf7 !important;
  box-shadow: 0 0 18px rgba(168, 156, 247, 0.7) !important;
}

.piano-key.key-target {
  background: var(--accent3) !important;
  box-shadow: 0 0 22px rgba(245, 166, 35, 0.65) !important;
}

.piano-key.key-detected {
  background: var(--accent2) !important;
  box-shadow: 0 0 18px rgba(70, 217, 181, 0.6) !important;
}

/* ─── Score section ─────────────────────────────────────────────────────────── */
.score-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  backdrop-filter: blur(20px);
}

.score-header {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}

.score-overall {
  text-align: center;
  margin-bottom: 20px;
}

.ov-stars {
  font-size: 2rem;
  color: var(--accent3);
  text-shadow: 0 0 14px rgba(245, 166, 35, 0.5);
  letter-spacing: 0.1em;
}

.ov-msg {
  font-size: 1rem;
  font-weight: 700;
  margin-top: 6px;
}

.score-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.score-note {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.score-note.sn-correct {
  border-color: rgba(102, 187, 106, 0.4);
  background: rgba(102, 187, 106, 0.07);
}

.score-note.sn-close {
  border-color: rgba(255, 167, 38, 0.4);
  background: rgba(255, 167, 38, 0.07);
}

.score-note.sn-wrong {
  border-color: rgba(239, 83, 80, 0.4);
  background: rgba(239, 83, 80, 0.07);
}

.sn-sol {
  font-size: 1rem;
  font-weight: 900;
  min-width: 42px;
}

.sn-sci {
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
  min-width: 44px;
}

.sn-stars {
  color: var(--accent3);
  font-size: 0.82rem;
  flex: 1;
}

.sn-pct {
  font-weight: 700;
  font-size: 0.85rem;
  min-width: 40px;
  text-align: right;
}

.sn-cents {
  font-family: 'Space Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
  min-width: 54px;
  text-align: right;
}

.sn-correct .sn-sol {
  color: var(--ok);
}

.sn-close .sn-sol {
  color: var(--warn);
}

.sn-wrong .sn-sol {
  color: var(--danger);
}

/* ─── Footer ────────────────────────────────────────────────────────────────── */
footer {
  position: relative;
  z-index: 1;
  padding: 24px;
  font-size: 0.72rem;
  color: rgba(232, 234, 246, 0.28);
  text-align: center;
}

/* ─── Dialog / Builder ──────────────────────────────────────────────────────── */
dialog {
  background: rgba(14, 16, 36, 0.97);
  border: 1px solid var(--border2);
  border-radius: 20px;
  color: var(--text);
  padding: 0;
  max-width: 700px;
  width: 92vw;
  backdrop-filter: blur(32px);
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.7);
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
}

.dialog-inner {
  padding: 28px 26px;
}

.dialog-inner h3 {
  font-size: 1.05rem;
  font-weight: 900;
  margin-bottom: 16px;
}

#exerciseName {
  width: 100%;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  outline: none;
  margin-bottom: 16px;
  transition: border-color 0.2s;
}

#exerciseName:focus {
  border-color: var(--accent);
}

.builder-seq-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

.muted {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
}

.builder-seq {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  min-height: 42px;
  margin-bottom: 18px;
  padding: 8px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.builder-empty {
  color: var(--muted);
  font-size: 0.82rem;
}

.builder-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border-radius: 8px;
  background: rgba(124, 109, 245, 0.18);
  border: 1px solid rgba(124, 109, 245, 0.4);
  font-size: 0.85rem;
  font-weight: 700;
  color: #c5beff;
}

.bchip-del {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  font-size: 0.7rem;
  padding: 0 2px;
  transition: color 0.15s;
}

.bchip-del:hover {
  color: var(--danger);
}

.builder-piano-wrap {
  margin-bottom: 20px;
}

.builder-piano-wrap .piano-scroll {
  padding-bottom: 6px;
}

.dialog-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.btn-primary {
  padding: 10px 24px;
  border-radius: 99px;
  background: linear-gradient(135deg, #6c5ce7, #46d9b5);
  color: #fff;
  border: none;
  font-family: 'Inter', sans-serif;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 5px 20px rgba(108, 92, 231, 0.35);
  transition: transform 0.15s, box-shadow 0.2s;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 28px rgba(70, 217, 181, 0.4);
}

.btn-ghost {
  padding: 10px 20px;
  border-radius: 99px;
  background: var(--surface);
  border: 1px solid var(--border2);
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.btn-ghost:hover {
  background: var(--surface2);
  color: var(--text);
}

/* ─── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .settings-bar {
    gap: 12px;
  }

  .stage-controls {
    gap: 8px;
  }

  .btn-transport {
    padding: 10px 18px;
    font-size: 0.82rem;
  }

  .note-chips {
    gap: 8px;
  }

  .score-note {
    flex-wrap: wrap;
    gap: 6px;
  }

  .dialog-inner {
    padding: 20px 16px;
  }
}

/* ─── Singing progress bar ───────────────────────────────────────────────────── */
.sing-progress-wrap {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 99px;
  margin-bottom: 16px;
  overflow: hidden;
}

.sing-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 99px;
  transition: width 0.12s linear;
  box-shadow: 0 0 8px rgba(70, 217, 181, 0.5);
}