:root {
  --bg-dark: #0f172a;
  --bg-panel: #1e293b;
  --bg-card: #26334d;
  --bg-input: #0f172a;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --accent: #38bdf8;
  --accent-hover: #0284c7;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;

  /* Voice colors */
  --color-tenor1: #f59e0b;   /* Amber/Gold */
  --color-tenor2: #10b981;   /* Emerald */
  --color-baritono: #3b82f6; /* Blue */
  --color-baixo: #a855f7;    /* Purple */
  --color-piano: #ec4899;    /* Pink/Rose */
}

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

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

/* Header */
.app-header {
  background: linear-gradient(90deg, #0f172a 0%, #1e293b 100%);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 50;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, #38bdf8, #6366f1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  font-weight: bold;
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.25);
}

.brand h1 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand span {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.my-voice-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(15, 23, 42, 0.7);
  padding: 0.4rem 0.65rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.my-voice-selector .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-right: 0.25rem;
}

.voice-pill {
  border: 1px solid var(--border-color);
  background: var(--bg-panel);
  color: var(--text-main);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.voice-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.voice-pill.active[data-voice="tenor1"] {
  background: rgba(245, 158, 11, 0.2);
  border-color: var(--color-tenor1);
  color: #fde68a;
}
.voice-pill.active[data-voice="tenor2"] {
  background: rgba(16, 185, 129, 0.2);
  border-color: var(--color-tenor2);
  color: #a7f3d0;
}
.voice-pill.active[data-voice="baritono"] {
  background: rgba(59, 130, 246, 0.25);
  border-color: var(--color-baritono);
  color: #bfdbfe;
}
.voice-pill.active[data-voice="baixo"] {
  background: rgba(168, 85, 247, 0.25);
  border-color: var(--color-baixo);
  color: #e9d5ff;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Layout */
.app-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  flex: 1;
  min-height: calc(100vh - 70px);
}

@media (max-width: 980px) {
  .app-layout {
    grid-template-columns: 1fr;
  }
}

/* Sidebar Repertoire */
.sidebar {
  background: var(--bg-panel);
  border-right: 1px solid var(--border-color);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-header h2 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.search-box input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  font-size: 0.88rem;
}

.song-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  overflow-y: auto;
  max-height: calc(100vh - 220px);
}

.song-item {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.song-item:hover {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.07);
}

.song-item.active {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.14);
  box-shadow: inset 3px 0 0 var(--accent);
}

.song-item-title {
  font-weight: 600;
  font-size: 0.94rem;
  margin-bottom: 0.2rem;
}

.song-item-meta {
  font-size: 0.76rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  gap: 0.4rem;
}

.badge {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  font-size: 0.68rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}

/* Main Content */
.main-workspace {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  overflow-x: hidden;
}

/* Song Info & Transport Bar */
.transport-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

.song-title-group h2 {
  font-size: 1.35rem;
  font-weight: 700;
}

.song-title-group p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Quick Rehearsal Presets */
.rehearsal-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 0.65rem;
  background: rgba(15, 23, 42, 0.6);
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.rehearsal-presets .preset-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent);
  margin-right: 0.35rem;
}

.preset-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.45rem 0.8rem;
  border-radius: 7px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

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

.preset-btn.active {
  background: var(--accent);
  color: #0f172a;
  border-color: var(--accent);
}

/* Transport Controls Row */
.transport-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.play-buttons {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem 0.95rem;
  border-radius: 8px;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.15s;
}

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

.btn-primary {
  background: var(--accent);
  color: #0f172a;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
}

.btn-play {
  padding: 0.6rem 1.3rem;
  font-size: 0.95rem;
  background: var(--success);
  border-color: var(--success);
  color: #052e16;
}

.btn-play.playing {
  background: var(--warning);
  border-color: var(--warning);
  color: #451a03;
}

.timeline-wrapper {
  flex: 1;
  min-width: 220px;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.timeline-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.timeline-slider {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

.extra-controls {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.control-chip {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-input);
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  font-size: 0.8rem;
}

.control-chip input[type="number"],
.control-chip select {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 4px;
  padding: 0.15rem 0.35rem;
  width: 58px;
  font-size: 0.8rem;
}

/* 5-Channel Voice Mixer */
.mixer-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.75rem;
}

@media (max-width: 1150px) {
  .mixer-grid {
    grid-template-columns: repeat(auto-fit, minmax(195px, 1fr));
  }
}

.channel-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-top: 4px solid var(--border-color);
  border-radius: 10px;
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  position: relative;
  transition: transform 0.15s, box-shadow 0.15s;
}

.channel-card[data-role="tenor1"] { border-top-color: var(--color-tenor1); }
.channel-card[data-role="tenor2"] { border-top-color: var(--color-tenor2); }
.channel-card[data-role="baritono"] { border-top-color: var(--color-baritono); }
.channel-card[data-role="baixo"] { border-top-color: var(--color-baixo); }
.channel-card[data-role="piano"] { border-top-color: var(--color-piano); }

.channel-card.singing-now {
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.22);
}

.channel-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.channel-name {
  font-weight: 700;
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.channel-btns {
  display: flex;
  gap: 0.3rem;
}

.sm-btn {
  width: 28px;
  height: 26px;
  border-radius: 5px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.75rem;
  cursor: pointer;
}

.sm-btn.solo.active {
  background: var(--warning);
  color: #000;
  border-color: var(--warning);
}

.sm-btn.mute.active {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.live-note-box {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.35rem 0.55rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 34px;
}

.live-note-pitch {
  font-family: monospace;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent);
}

.live-note-lyric {
  font-size: 0.82rem;
  color: var(--text-main);
  font-style: italic;
}

.volume-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.76rem;
  color: var(--text-muted);
}

.volume-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
}

.timbre-select {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.3rem 0.45rem;
  border-radius: 5px;
  font-size: 0.75rem;
}

/* Score & Visual Roll Viewer */
.viewer-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 430px;
}

.viewer-tabs {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 1rem;
  background: rgba(15, 23, 42, 0.6);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tab-group {
  display: flex;
  gap: 0.4rem;
}

.tab-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
}

.tab-btn.active {
  background: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
}

.viewer-body {
  padding: 1rem;
  flex: 1;
  position: relative;
}

#osmd-container {
  background: #ffffff;
  color: #000000;
  border-radius: 8px;
  padding: 1rem;
  min-height: 360px;
  max-height: 560px;
  overflow-y: auto;
}

#pianoroll-container {
  background: #0b1120;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  overflow-x: auto;
  position: relative;
  min-height: 340px;
}

#pdf-container {
  min-height: 450px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#pdf-container iframe,
#pdf-container img {
  width: 100%;
  min-height: 550px;
  border: none;
  border-radius: 8px;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.82);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-backdrop.open {
  display: flex;
}

.modal-box {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 100%;
  max-width: 720px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-group.full {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.55rem 0.7rem;
  border-radius: 6px;
  font-size: 0.88rem;
}

.help-hint {
  font-size: 0.74rem;
  color: var(--text-muted);
}