/* ==========================================================================
   Semitone – Studio-UI Stylesheet (Dark & Light Mode, Keine Gamification)
   ========================================================================== */

:root,
[data-theme="dark"] {
  --bg-app: #0f1217;
  --bg-surface: #171b22;
  --bg-elevated: #1f2530;
  --bg-hover: #262e3d;
  --border-color: #2c3545;
  --border-strong: #3d495e;

  --text-main: #eef2f7;
  --text-secondary: #9ba6b8;
  --text-muted: #6e7a8e;

  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-soft: rgba(59, 130, 246, 0.16);

  --success: #10b981;
  --success-soft: rgba(16, 185, 129, 0.16);
  --warning: #f59e0b;
  --warning-soft: rgba(245, 158, 11, 0.16);
  --danger: #ef4444;
  --danger-soft: rgba(239, 68, 68, 0.16);

  --piano-white: #f8fafc;
  --piano-white-border: #cbd5e1;
  --piano-black: #1e232b;
  --piano-marked: #60a5fa;
  --piano-root: #f59e0b;
  --piano-playing: #10b981;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.25);
}

[data-theme="light"] {
  --bg-app: #f3f5f8;
  --bg-surface: #ffffff;
  --bg-elevated: #f8fafc;
  --bg-hover: #edf2f7;
  --border-color: #dbe2ec;
  --border-strong: #bcc7d6;

  --text-main: #111827;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;

  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: rgba(37, 99, 235, 0.11);

  --success: #059669;
  --success-soft: rgba(5, 150, 105, 0.12);
  --warning: #d97706;
  --warning-soft: rgba(217, 119, 6, 0.12);
  --danger: #dc2626;
  --danger-soft: rgba(220, 38, 38, 0.12);

  --piano-white: #ffffff;
  --piano-white-border: #94a3b8;
  --piano-black: #1e293b;
  --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.06);
}

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

.hidden {
  display: none !important;
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   Header & Studio Bar
   ========================================================================== */

.top-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.5rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
}

.brand-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-subtitle {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.main-nav {
  display: flex;
  gap: 0.35rem;
  background: var(--bg-elevated);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.nav-tab {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.nav-tab:hover {
  color: var(--text-main);
}

.nav-tab.active {
  background: var(--accent);
  color: #ffffff;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.studio-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.65rem 1.5rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-color);
  align-items: center;
}

.studio-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.studio-control label {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

select,
input[type="number"] {
  background: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.38rem 0.65rem;
  font-size: 0.85rem;
  font-weight: 500;
  outline: none;
}

select:focus,
input[type="number"]:focus {
  border-color: var(--accent);
}

select:disabled,
input:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.studio-control-tempo {
  flex-wrap: wrap;
}

.tempo-slider-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.55rem;
}

.tempo-slider-wrap input[type="range"] {
  width: 96px;
  accent-color: var(--accent);
  cursor: pointer;
}

.tempo-bpm-badge {
  font-size: 0.78rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  min-width: 60px;
  text-align: right;
}

/* ==========================================================================
   Buttons & Controls
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.95rem;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
  color: var(--text-main);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-surface);
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--border-strong);
}

.btn-secondary.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.btn-sm {
  padding: 0.36rem 0.7rem;
  font-size: 0.82rem;
}

.btn-xs {
  padding: 0.28rem 0.5rem;
  font-size: 0.76rem;
}

.btn-lg {
  padding: 0.7rem 1.35rem;
  font-size: 0.96rem;
}

.btn-block {
  width: 100%;
}

.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.1rem 0.3rem;
}

.btn-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Main Workspace & Mode 1: Explore / Reference
   ========================================================================== */

.main-workspace {
  flex: 1;
  max-width: 1360px;
  width: 100%;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 2rem;
}

.section-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.category-pills {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.pill-btn {
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
}

.pill-btn:hover {
  color: var(--text-main);
  border-color: var(--border-strong);
}

.pill-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

.segmented-control {
  display: inline-flex;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.2rem;
  gap: 0.2rem;
  flex-wrap: wrap;
}

.seg-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.36rem 0.75rem;
  border-radius: 4px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

.seg-btn.active {
  background: var(--bg-elevated);
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

/* Inspector Banner */
.inspector-banner {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.2rem;
  margin-bottom: 1.2rem;
}

.inspector-empty {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.kbd-hint kbd,
.kbd-inline {
  font-family: monospace;
  font-size: 0.76rem;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  opacity: 0.85;
}

.inspector-active {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.inspector-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 0.2rem;
}

.inspector-title {
  margin: 0 0 0.4rem 0;
  font-size: 1.15rem;
}

.inspector-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.meta-chip {
  font-size: 0.82rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
}

.inspector-char {
  margin: 0.2rem 0 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.inspector-hint {
  margin: 0.25rem 0 0;
  font-size: 0.83rem;
  color: var(--text-muted);
}

.inspector-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Cards Grids */
.cards-grid {
  display: grid;
  gap: 0.9rem;
}

.coarse-grid {
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
}

.fine-grid {
  grid-template-columns: repeat(auto-fill, minmax(245px, 1fr));
}

.triad-grid {
  grid-template-columns: repeat(auto-fill, minmax(295px, 1fr));
}

.sound-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: left;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.15s ease, background 0.15s ease;
  color: var(--text-main);
}

.clickable-card,
.fine-interval-card {
  cursor: pointer;
}

.clickable-card:hover,
.fine-interval-card:hover {
  border-color: var(--accent);
  background: var(--bg-elevated);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.45rem;
}

.badge-step,
.badge-short {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.18rem 0.5rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
}

.semitone-tag {
  font-size: 0.76rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.card-title {
  margin: 0 0 0.3rem 0;
  font-size: 1.02rem;
}

.card-structure {
  margin: 0 0 0.35rem 0;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
}

.card-desc {
  margin: 0 0 0.75rem 0;
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.card-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 0.45rem;
}

.sub-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-top: auto;
}

.chip-play-btn {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.6rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.chip-play-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.inversion-button-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: auto;
}

.inversion-subrow {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.inversion-subrow-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.35rem;
}

/* Combined Coarse + Fine View */
.combined-intervals-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.combined-group-row {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 0.85rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  align-items: stretch;
}

@media (max-width: 780px) {
  .combined-group-row {
    grid-template-columns: 1fr;
  }
}

.combined-coarse-col {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.combined-coarse-col:hover {
  background: var(--bg-elevated);
}

.coarse-step-circle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.coarse-group-title {
  margin: 0;
  font-size: 0.98rem;
}

.coarse-group-sub {
  margin: 0.15rem 0 0;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.combined-fine-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.55rem;
}

.fine-inline-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.8rem;
  text-align: left;
  color: var(--text-main);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.fine-inline-card:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
}

.fine-inline-top {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.25rem;
}

.fine-inline-top .semitone-tag {
  margin-left: auto;
}

.fine-inline-char {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.fine-inline-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ==========================================================================
   Mode 2: Practice (Übungsmodus)
   ========================================================================== */

.card-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.practice-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 920px) {
  .practice-layout {
    grid-template-columns: 1fr;
  }
}

.panel-heading {
  margin: 0 0 0.75rem 0;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.vertical-nav {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.vnav-btn {
  display: flex;
  flex-direction: column;
  text-align: left;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.75rem;
  color: var(--text-main);
  cursor: pointer;
  transition: border-color 0.15s ease;
}

.vnav-btn strong {
  font-size: 0.86rem;
}

.vnav-btn span {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.15rem;
}

.vnav-btn.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 1rem 0;
}

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

.filter-heading {
  margin: 0 0 0.5rem 0;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.filter-chips {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  max-height: 260px;
  overflow-y: auto;
}

.chip-checkbox,
.toggle-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  cursor: pointer;
  padding: 0.2rem 0;
}

.stage-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.stage-cat-badge {
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
}

.session-stats {
  font-size: 0.86rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.audio-prompt-box {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  padding: 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}

.answer-step-title {
  margin: 0 0 0.6rem 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.answer-options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
  gap: 0.6rem;
}

.answer-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.85rem;
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
  transition: all 0.12s ease;
}

.answer-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--bg-hover);
}

.answer-btn.is-selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.answer-btn.is-correct {
  border-color: var(--success);
  background: var(--success-soft);
}

.answer-btn.is-wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.ans-short {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.15rem;
}

.ans-label {
  font-size: 0.9rem;
  font-weight: 600;
}

/* Feedback Box */
.feedback-box {
  margin-top: 1.25rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.feedback-correct {
  background: var(--success-soft);
  border-color: var(--success);
}

.feedback-wrong {
  background: var(--danger-soft);
  border-color: var(--danger);
}

.feedback-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.feedback-status-badge {
  font-weight: 700;
  font-size: 0.95rem;
}

.feedback-notes {
  font-size: 0.85rem;
}

.feedback-solution {
  font-size: 0.92rem;
  margin-bottom: 0.85rem;
}

.feedback-sub {
  color: var(--text-secondary);
  font-size: 0.84rem;
  margin-left: 0.35rem;
}

.feedback-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
}

/* ==========================================================================
   Mode 3: Exam (Prüfungsmodus)
   ========================================================================== */

.exam-config-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.exam-config-header h2 {
  margin: 0 0 0.25rem 0;
}

.exam-presets {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.preset-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.exam-modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.exam-module-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.95rem 1.1rem;
  transition: opacity 0.15s ease, border-color 0.15s ease;
}

.exam-module-card.is-enabled {
  border-color: var(--accent);
}

.exam-module-card.is-disabled {
  opacity: 0.55;
}

.exam-module-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.module-toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.module-title {
  font-weight: 700;
  font-size: 0.94rem;
}

.module-count-box {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
}

.module-count-box input {
  width: 64px;
  text-align: center;
}

.module-desc {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.exam-options-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.exam-option-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.86rem;
}

.exam-start-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-left: auto;
}

.total-tasks-summary {
  font-size: 0.92rem;
}

/* Exam Running */
.exam-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.65rem;
}

.exam-progress-meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.exam-step-counter {
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
}

.progress-bar-track {
  height: 6px;
  background: var(--bg-elevated);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 1.25rem;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.25s ease;
}

.exam-footer-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

/* Exam Result & Grading */
.result-hero {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

@media (max-width: 720px) {
  .result-hero {
    grid-template-columns: 1fr;
  }
}

.grade-badge-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 1.2rem;
  text-align: center;
}

.grade-excellent .grade-badge-box {
  border-color: var(--success);
}
.grade-good .grade-badge-box {
  border-color: var(--accent);
}
.grade-satisfactory .grade-badge-box,
.grade-sufficient .grade-badge-box {
  border-color: var(--warning);
}
.grade-failed .grade-badge-box {
  border-color: var(--danger);
}

.grade-caption {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.grade-number {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.1;
  margin: 0.25rem 0;
  font-variant-numeric: tabular-nums;
}

.grade-predicate {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.result-summary-col h2 {
  margin: 0 0 0.35rem 0;
}

.result-score-line {
  margin: 0 0 1rem 0;
  font-size: 0.96rem;
}

.category-breakdown-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-bottom: 1.1rem;
}

.cat-breakdown-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.84rem;
  margin-bottom: 0.2rem;
}

.mini-progress-track {
  height: 6px;
  background: var(--bg-surface);
  border-radius: 999px;
  overflow: hidden;
}

.mini-progress-fill {
  height: 100%;
  background: var(--accent);
}

.result-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.protocol-table-wrap {
  overflow-x: auto;
}

.protocol-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.protocol-table th,
.protocol-table td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.protocol-table th {
  color: var(--text-secondary);
  font-weight: 600;
  background: var(--bg-elevated);
}

.row-correct td:first-child {
  border-left: 4px solid var(--success);
}

.row-partial td:first-child {
  border-left: 4px solid var(--warning);
}

.row-wrong td:first-child {
  border-left: 4px solid var(--danger);
}

.table-sub {
  font-size: 0.76rem;
  color: var(--text-secondary);
}

.protocol-actions-cell {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

/* ==========================================================================
   Piano Keyboard Drawer
   ========================================================================== */

.piano-drawer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 0.6rem 1.5rem 0.9rem;
  margin-top: auto;
}

.piano-drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.piano-legend {
  display: flex;
  gap: 1rem;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-root {
  background: var(--piano-root);
}
.dot-marked {
  background: var(--piano-marked);
}
.dot-playing {
  background: var(--piano-playing);
}

.piano-scroll-wrap {
  overflow-x: auto;
}

.piano-keyboard {
  position: relative;
  height: 112px;
  min-width: 640px;
  max-width: 1020px;
  margin: 0 auto;
  display: flex;
  user-select: none;
}

.piano-key {
  position: relative;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 6px;
  font-size: 0.7rem;
  font-weight: 600;
  transition: background-color 0.08s ease;
}

.white-key {
  flex: 1;
  height: 100%;
  background: var(--piano-white);
  border: 1px solid var(--piano-white-border);
  border-radius: 0 0 5px 5px;
  color: #334155;
  z-index: 1;
}

.white-key:hover {
  background: #e2e8f0;
}

.black-key {
  position: absolute;
  top: 0;
  height: 62%;
  background: var(--piano-black);
  border: 1px solid #0f172a;
  border-radius: 0 0 4px 4px;
  color: #cbd5e1;
  z-index: 2;
}

.black-key:hover {
  background: #334155;
}

.piano-key.is-marked {
  background: var(--piano-marked) !important;
  color: #ffffff !important;
}

.piano-key.is-root {
  background: var(--piano-root) !important;
  color: #111827 !important;
}

.piano-key.is-playing {
  background: var(--piano-playing) !important;
  color: #ffffff !important;
}

.mt-xs { margin-top: 0.35rem; }
.mt-sm { margin-top: 0.65rem; }
.mt-md { margin-top: 1rem; }
.mt-lg { margin-top: 1.5rem; }
.mb-sm { margin-bottom: 0.65rem; }
.text-muted { color: var(--text-secondary); font-size: 0.88rem; margin: 0; }