/* INSTRUMENTAL — 3-color palette: sand bg, black text, amaranth accent */

:root {
  --black: #000000;
  --sand: #D4C5A0;
  --amaranth: #E52B50;
  --black-dim: rgba(0, 0, 0, 0.15);
  --black-mid: rgba(0, 0, 0, 0.4);
  --sand-dim: rgba(212, 197, 160, 0.3);
  --amaranth-dim: rgba(229, 43, 80, 0.15);
  --amaranth-glow: rgba(229, 43, 80, 0.4);
}

/* ── Reset ─────────────────────────────────────── */

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

/* ── Body ──────────────────────────────────────── */

body {
  background: var(--sand);
  color: var(--black);
  font-family: 'Space Grotesk', sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

main {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

/* ── Header ────────────────────────────────────── */

header {
  width: 100%;
  text-align: center;
  padding-top: 60px;
  padding-bottom: 48px;
}

.logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--black);
  border: none;
  background: none;
}

/* ── Drop Zone ─────────────────────────────────── */

.drop-zone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  border: 2px dashed var(--black-dim);
  border-radius: 16px;
  cursor: pointer;
  transition: border 0.3s, background 0.3s;
  padding: 48px 32px 32px;
  gap: 16px;
}

.drop-zone.dragover {
  border: 2px solid var(--amaranth);
  background: var(--amaranth-dim);
}

.drop-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  flex: 1;
  justify-content: center;
}

.drop-content svg {
  opacity: 0.6;
  transition: opacity 0.3s;
}

.drop-zone:hover .drop-content svg,
.drop-zone.dragover .drop-content svg {
  opacity: 1;
}

.drop-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--black);
}

.drop-hint {
  font-size: 0.8rem;
  color: var(--black-mid);
}

/* ── Mode Toggle ───────────────────────────────── */

.mode-toggle {
  display: flex;
  gap: 8px;
}

.mode-btn {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 6px 18px;
  border-radius: 20px;
  border: 1px solid var(--black-dim);
  background: transparent;
  color: var(--black);
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mode-btn:hover {
  border-color: var(--black-mid);
}

.mode-btn.active {
  background: var(--amaranth);
  color: var(--sand);
  border-color: var(--amaranth);
}

/* ── File Info ──────────────────────────────────── */

.file-info {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--black);
}

.clear-btn {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  background: none;
  border: none;
  color: var(--black);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: color 0.2s;
}

.clear-btn:hover {
  color: var(--amaranth);
}

/* ── Match Button ──────────────────────────────── */

.match-btn {
  width: 100%;
  padding: 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--amaranth);
  color: var(--sand);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.match-btn:hover:not(:disabled) {
  background: rgba(229, 43, 80, 0.85);
}

.match-btn:active:not(:disabled) {
  transform: scale(0.99);
}

.match-btn:disabled {
  background: var(--black-dim);
  color: var(--black-mid);
  cursor: not-allowed;
}

/* ── Progress Section ──────────────────────────── */

.progress-section {
  margin-top: 32px;
  animation: fadeIn 0.4s ease-out;
}

/* ── Live knobs ───────────────────────────────── */

.knobs-container {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.knob-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.knob {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--black);
  position: relative;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3), inset 0 1px 2px rgba(255,255,255,0.05);
}

.knob-indicator {
  position: absolute;
  width: 2px;
  height: 18px;
  background: var(--amaranth);
  bottom: 50%;
  left: 50%;
  margin-left: -1px;
  transform-origin: bottom center;
  border-radius: 1px;
  transition: transform 0.3s ease-out;
}

.knob-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--black-mid);
  text-align: center;
  max-width: 56px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.knob-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.5rem;
  color: var(--amaranth);
}

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--black-dim);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--amaranth);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.progress-stats {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--black);
}

/* ── Result Section ────────────────────────────── */

.result-section {
  margin-top: 32px;
  animation: fadeIn 0.4s ease-out;
}

.waveform-canvas {
  width: 100%;
  height: 120px;
  display: block;
  border-bottom: 1px solid var(--black-dim);
}

/* ── Keyboard ──────────────────────────────────── */

.keyboard-container {
  width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  border-radius: 8px;
  margin-top: 24px;
  position: relative;
  display: flex;
}

.keyboard-container .key.white {
  position: relative;
  flex: 1;
  height: 160px;
  background: var(--sand);
  border-right: 2px solid var(--black);
  cursor: pointer;
  transition: background 0.1s;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 8px;
  box-shadow:
    inset 0 -4px 6px rgba(0, 0, 0, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  border-radius: 0 0 4px 4px;
}

.keyboard-container .key.white:last-child {
  border-right: none;
}

.keyboard-container .key.white:hover {
  background: linear-gradient(to bottom, var(--sand), rgba(229, 43, 80, 0.12));
}

.keyboard-container .key.white.active {
  background: var(--amaranth);
  box-shadow:
    inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.keyboard-container .key.black {
  position: absolute;
  height: 100px;
  width: 60%;
  z-index: 2;
  background: var(--black);
  border: 1px solid var(--black-mid);
  cursor: pointer;
  transition: background 0.1s;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 6px;
  box-shadow:
    inset 0 -2px 4px rgba(194, 178, 128, 0.05),
    0 3px 6px rgba(0, 0, 0, 0.5);
  border-radius: 0 0 3px 3px;
}

.keyboard-container .key.black:hover {
  background: var(--amaranth-dim);
}

.keyboard-container .key.black.active {
  background: var(--amaranth);
  box-shadow:
    inset 0 2px 3px rgba(0, 0, 0, 0.4);
}

.keyboard-container .key-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.6rem;
  pointer-events: none;
  user-select: none;
}

.keyboard-container .key.white .key-label {
  color: var(--black-mid);
}

.keyboard-container .key.black .key-label {
  color: rgba(194, 178, 128, 0.3);
}

/* ── Export Button ──────────────────────────────── */

.export-btn {
  position: absolute;
  bottom: 8px;
  left: 8px;
  z-index: 10;
  padding: 6px 14px;
  border-radius: 16px;
  border: 1.5px solid var(--black-mid);
  background: var(--sand);
  color: var(--black);
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.2s;
}

.export-btn:hover {
  border-color: var(--amaranth);
  color: var(--amaranth);
}

/* ── Preset Button ─────────────────────────────── */

.preset-btn {
  position: absolute;
  bottom: 8px;
  right: 8px;
  z-index: 10;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--black-mid);
  background: var(--sand);
  color: var(--black);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  padding: 0;
}

.preset-btn:hover {
  border-color: var(--amaranth);
  color: var(--amaranth);
}

.preset-btn.active {
  background: var(--amaranth);
  color: var(--sand);
  border-color: var(--amaranth);
}

/* ── DAW Section ───────────────────────────────── */

.daw-section {
  margin-top: 32px;
  animation: fadeIn 0.4s ease-out;
}

.daw-container {
  width: 100%;
  height: 200px;
  background: var(--black);
  border: 1px solid var(--black-dim);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
}

.daw-play-btn {
  width: 100%;
  margin-top: 12px;
  padding: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--amaranth);
  color: var(--sand);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.daw-play-btn:hover {
  background: rgba(229, 43, 80, 0.85);
}

.daw-play-btn:active {
  transform: scale(0.99);
}

/* ── Utility ───────────────────────────────────── */

.hidden {
  display: none;
}

/* ── Animations ────────────────────────────────── */

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ── Search ────────────────────────────────────── */

/* ── Demo cards ───────────────────────────────── */

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--black-mid);
  margin-bottom: 2px;
}

.section-hint {
  font-size: 0.75rem;
  color: var(--black-mid);
  margin-bottom: 10px;
}

.demo-section {
  margin-bottom: 16px;
}

.wild-section {
  margin-bottom: 16px;
}

.wild-options {
  margin-top: 8px;
}

/* Honesty popup */
.quality-notice {
  margin-top: 16px;
  padding: 12px 16px;
  border: 1px solid var(--black-dim);
  border-radius: 8px;
  background: rgba(0,0,0,0.03);
  cursor: pointer;
}

.quality-notice-header {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--amaranth);
  display: flex;
  align-items: center;
  gap: 6px;
}

.quality-notice-body {
  font-size: 0.8rem;
  color: var(--black-mid);
  margin-top: 8px;
  line-height: 1.5;
  display: none;
}

.quality-notice.open .quality-notice-body {
  display: block;
}

.demo-grid {
  display: flex;
  gap: 12px;
}

.demo-card {
  flex: 1;
  padding: 20px;
  border: 1.5px solid var(--black-dim);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

.demo-card:hover {
  border-color: var(--amaranth);
  background: var(--amaranth-dim);
}

.demo-card.active {
  border-color: var(--amaranth);
  background: var(--amaranth-dim);
}

.demo-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.demo-subtitle {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.8rem;
  color: var(--black-mid);
  margin-top: 4px;
}

.search-section {
  margin-bottom: 16px;
}

.search-bar {
  display: flex;
  gap: 8px;
}

#searchInput {
  flex: 1;
  padding: 12px;
  border: 1px solid var(--black-dim);
  border-radius: 8px;
  background: transparent;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.9rem;
  color: var(--black);
  outline: none;
  transition: border-color 0.2s;
}

#searchInput:focus {
  border-color: var(--amaranth);
}

.search-btn {
  width: auto;
  padding: 12px 24px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--amaranth);
  color: var(--sand);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.search-btn:hover {
  background: rgba(229, 43, 80, 0.85);
}

.search-btn:active {
  transform: scale(0.99);
}

.search-results {
  max-height: 360px;
  overflow-y: auto;
  margin-top: 8px;
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

.search-result-item:hover {
  background: var(--amaranth-dim);
}

.search-result-item img {
  width: 48px;
  height: 48px;
  border-radius: 4px;
  object-fit: cover;
}

.search-result-item .result-info {
  display: flex;
  flex-direction: column;
}

.result-title {
  font-weight: 600;
  font-size: 0.9rem;
}

.result-artist {
  font-size: 0.8rem;
  color: var(--black-mid);
}

/* ── A/B comparison ───────────────────────────── */

.ab-track {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
}

.ab-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--black-mid);
  width: 72px;
  flex-shrink: 0;
}

.ab-bar {
  flex: 1;
  height: 3px;
  background: var(--black-dim);
  border-radius: 2px;
  overflow: hidden;
}

.ab-bar-fill {
  height: 100%;
  background: var(--amaranth);
  border-radius: 2px;
  width: 0%;
  transition: width 0.1s;
}

.ab-volume {
  width: 64px;
  flex-shrink: 0;
  accent-color: var(--amaranth);
  cursor: pointer;
}

.ab-transport {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  margin-bottom: 16px;
}

.ab-play-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px solid var(--black-mid);
  background: var(--sand);
  color: var(--black);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  transition: all 0.2s;
  padding: 0;
  flex-shrink: 0;
}

.ab-play-btn:hover {
  border-color: var(--amaranth);
  color: var(--amaranth);
}

.ab-progress {
  flex: 1;
  height: 4px;
  background: var(--black-dim);
  border-radius: 2px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.ab-progress-fill {
  height: 100%;
  background: var(--amaranth);
  border-radius: 2px;
  transition: width 0.1s;
}

.ab-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--black-mid);
  white-space: nowrap;
}

.player-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--black-mid);
  margin-top: 12px;
  margin-bottom: 4px;
}

.divider-or {
  text-align: center;
  margin: 16px 0;
  font-size: 0.8rem;
  color: var(--black-mid);
  font-family: 'JetBrains Mono', monospace;
}

/* ── Player ────────────────────────────────────── */

.player-section {
  margin-top: 16px;
  margin-bottom: 16px;
}

.player {
  display: flex;
  align-items: center;
  gap: 12px;
}

.player-play-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--black-mid);
  background: var(--sand);
  color: var(--black);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  transition: all 0.2s;
  padding: 0;
}

.player-play-btn:hover {
  border-color: var(--amaranth);
  color: var(--amaranth);
}

.player-progress {
  flex: 1;
  height: 4px;
  background: var(--black-dim);
  border-radius: 2px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.player-progress-fill {
  height: 100%;
  background: var(--amaranth);
  border-radius: 2px;
  transition: width 0.1s;
}

.player-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--black-mid);
  white-space: nowrap;
}

/* ── Stems ─────────────────────────────────────── */

.stem-section {
  margin-top: 16px;
  margin-bottom: 16px;
}

.stem-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stem-row {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid var(--black-dim);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.stem-row:hover {
  border-color: var(--black-mid);
}

.stem-row.selected {
  border-color: var(--amaranth);
  background: var(--amaranth-dim);
}

.stem-play-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid var(--black-dim);
  background: transparent;
  color: var(--black);
  cursor: pointer;
  font-size: 0.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
  margin-right: 8px;
  padding: 0;
}

.stem-play-btn:hover {
  border-color: var(--amaranth);
  color: var(--amaranth);
}

.stem-play-btn.playing {
  border-color: var(--amaranth);
  color: var(--amaranth);
  background: var(--amaranth-dim);
}

.stem-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 0 4px 0;
}

.stem-header-spacer {
  flex: 1;
}

.stem-header-dl-icon {
  width: 24px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--black-mid);
}

.stem-outer {
  display: flex;
  align-items: center;
  gap: 10px;
}

.stem-outer .stem-row {
  flex: 1;
}

.stem-checkbox {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  accent-color: var(--amaranth);
  cursor: pointer;
}

.stem-dl-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  margin-top: 8px;
  border: 1px solid var(--amaranth);
  border-radius: 8px;
  background: var(--amaranth-dim);
  animation: fadeIn 0.2s ease-out;
}

.stem-dl-bar.hidden {
  display: none;
}

.stem-dl-bar-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--black);
}

.stem-dl-bar-btn {
  padding: 6px 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--amaranth);
  color: var(--sand);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

.stem-dl-bar-btn:hover {
  background: rgba(229, 43, 80, 0.85);
}

.stem-row.loading {
  animation: stemPulse 1.5s ease-in-out infinite;
}

.stem-row.loading .stem-waveform {
  background: var(--black-dim);
  border-radius: 4px;
}

@keyframes stemPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.stem-label {
  width: 60px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stem-waveform {
  flex: 1;
  height: 36px;
  overflow: hidden;
  position: relative;
}

.stem-waveform canvas {
  width: 100%;
  height: 36px;
  display: block;
}

.stem-playhead {
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  background: var(--amaranth);
  display: none;
  pointer-events: none;
  z-index: 1;
}

/* ── Progress Phase ────────────────────────────── */

.progress-phase {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--amaranth);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Responsive ────────────────────────────────── */

@media (max-width: 600px) {
  header {
    padding-top: 36px;
    padding-bottom: 28px;
  }

  .logo {
    font-size: 1.3rem;
  }

  main {
    padding: 0 16px 48px;
  }

  .drop-zone {
    min-height: 300px;
    padding: 32px 20px 24px;
  }

  .keyboard-container .key.white {
    height: 120px;
  }

  .keyboard-container .key.black {
    height: 75px;
  }

  .match-btn {
    padding: 12px;
    font-size: 0.8rem;
  }

  .progress-stats {
    font-size: 0.7rem;
  }

  .daw-container {
    height: 150px;
  }
}