/* ═══════════════════════════════════════════════════════════════════════════
   8비트 사운드 제작기 (Chiptune Maker)
   동물의 숲 마을 멜로디 스타일 음높이 라인 작업대 & PC 16:9 와이드 레이아웃
   ═══════════════════════════════════════════════════════════════════════════ */

/* 와이드 레이아웃 컨테이너 확장 (16:9 화면 최적화) */
main:has(.chiptune-panel) {
    max-width: 1480px;
    padding-left: var(--space-3);
    padding-right: var(--space-3);
}

.chiptune-panel {
    max-width: 1440px;
    margin: 0 auto;
    padding: var(--space-3);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

/* ───────────────────────────────────────────────────────────────────────────
   1. 상단 마스터 전송 바 (Studio Topbar)
   ─────────────────────────────────────────────────────────────────────────── */

.studio-topbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 14px;
    box-shadow: var(--shadow-sm);
}

.transport-cluster {
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-transport {
    font-weight: 700;
    min-width: 80px;
}

.btn-transport.is-playing {
    background-color: var(--danger);
    border-color: var(--danger);
    color: #ffffff;
    animation: pulse-glow 1.4s infinite;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    50% { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
}

.slider-cluster {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.inline-control {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
}

.inline-control label {
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.badge-num {
    font-family: var(--font-mono);
    color: var(--accent);
    font-weight: 800;
    min-width: 28px;
    text-align: right;
}

.inline-control input[type="range"] {
    width: 100px;
    accent-color: var(--accent);
}

.bit-cluster {
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-cluster-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    white-space: nowrap;
}

.option-chips {
    display: flex;
    gap: 4px;
}

.option-chip {
    padding: 3px 8px;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.12s ease;
}

.option-chip:hover {
    background: var(--surface-3);
}

.option-chip.is-active {
    background: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
}

.export-cluster {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    flex-shrink: 0;
}

.autosave-badge {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-muted);
    background: var(--surface-2);
    border: 1px solid var(--border);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    transition: all 0.2s ease;
    user-select: none;
}

.autosave-badge.is-saved {
    color: #059669;
    border-color: rgba(5, 150, 105, 0.4);
    background: rgba(5, 150, 105, 0.08);
}

:root.dark-theme .autosave-badge.is-saved {
    color: #10b981;
    border-color: rgba(16, 185, 129, 0.4);
    background: rgba(16, 185, 129, 0.12);
}

.loops-control {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.export-loops-select {
    height: 34px;
    min-height: 34px;
    line-height: 34px;
    padding: 0 28px 0 10px;
    font-size: 0.82rem;
    font-weight: 700;
    font-family: inherit;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    background-color: var(--surface-2);
    color: var(--text-strong);
    min-width: 86px;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%2364748b' d='M0 0l5 6 5-6z'/%3E%3C/svg%3E");
    background-position: calc(100% - 10px) center;
    background-repeat: no-repeat;
    background-size: 8px 5px;
    box-sizing: border-box;
    flex-shrink: 0;
    transition: border-color 0.12s ease;
}

.export-loops-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-soft);
}

:root.dark-theme .export-loops-select {
    background-color: var(--surface-3);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%2394a3b8' d='M0 0l5 6 5-6z'/%3E%3C/svg%3E");
}

.btn-export-wav {
    height: 34px;
    min-height: 34px;
    padding: 0 12px;
    font-size: 0.82rem;
    font-weight: 700;
    white-space: nowrap;
    flex-shrink: 0;
}

/* ───────────────────────────────────────────────────────────────────────────
   2. OST 프리셋 & 무작위 생성 바 (Preset Bar)
   ─────────────────────────────────────────────────────────────────────────── */

.preset-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 12px;
}

.preset-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    white-space: nowrap;
}

.preset-btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.preset-btn-group .btn-sm {
    padding: 3px 10px;
    font-size: 0.78rem;
    font-weight: 600;
}

.ml-auto {
    margin-left: auto;
}

.random-cluster {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.random-slider-box {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 2px 8px;
    height: 30px;
    box-sizing: border-box;
}

.random-label {
    font-size: 0.76rem;
    font-weight: 700;
    color: var(--text-muted);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}

.random-slider-box input[type="range"] {
    width: 65px;
    height: 14px;
    accent-color: var(--accent);
    cursor: pointer;
}

/* ───────────────────────────────────────────────────────────────────────────
   3. 채널 탭 & 인라인 믹서 (Channel Tabs & Inline Mixer)
   ─────────────────────────────────────────────────────────────────────────── */

.channel-header-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 12px;
}

.channel-tabs-cluster {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.channel-tabs {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.track-add-dropdown {
    position: relative;
}

.btn-add-track {
    border: 1px dashed var(--accent) !important;
    color: var(--accent) !important;
    font-weight: 700 !important;
    background: transparent !important;
    white-space: nowrap;
}

.btn-add-track:hover {
    background: var(--accent-soft) !important;
}

.track-add-menu {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    z-index: 40;
    min-width: 175px;
    overflow: hidden;
}

.track-add-menu button {
    text-align: left;
    padding: 8px 12px;
    border: none;
    background: transparent;
    color: var(--text);
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.12s;
    white-space: nowrap;
}

.track-add-menu button:hover {
    background: var(--surface-3);
    color: var(--accent);
}

.channel-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
    font-weight: 700;
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
}

.channel-tab:hover {
    background: var(--surface-3);
    border-color: var(--border-strong);
}

.channel-tab.is-active {
    background: var(--surface);
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-soft);
    color: var(--text-strong);
}

.tab-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}

.dot-ch1 { background-color: #ff9f1c; box-shadow: 0 0 6px #ff9f1c; }
.dot-ch2 { background-color: #06d6a0; box-shadow: 0 0 6px #06d6a0; }
.dot-ch3 { background-color: #9d4edd; box-shadow: 0 0 6px #9d4edd; }
.dot-ch4 { background-color: #ef476f; box-shadow: 0 0 6px #ef476f; }
.dot-ch5 { background-color: #3a86ff; box-shadow: 0 0 6px #3a86ff; }
.dot-ch6 { background-color: #ff006e; box-shadow: 0 0 6px #ff006e; }
.dot-ch7 { background-color: #8338ec; box-shadow: 0 0 6px #8338ec; }
.dot-ch8 { background-color: #00b4d8; box-shadow: 0 0 6px #00b4d8; }

.channel-tag {
    font-size: 0.68rem;
    padding: 1px 6px;
    border-radius: var(--radius-pill);
    color: #ffffff;
    font-weight: 700;
    text-transform: uppercase;
}

.tag-ch1 { background-color: #ff9f1c; }
.tag-ch2 { background-color: #06d6a0; }
.tag-ch3 { background-color: #9d4edd; }
.tag-ch4 { background-color: #ef476f; }
.tag-ch5 { background-color: #3a86ff; }
.tag-ch6 { background-color: #ff006e; }
.tag-ch7 { background-color: #8338ec; }
.tag-ch8 { background-color: #00b4d8; }

.channel-mixer-controls {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-left: auto;
}

.btn-delete-track {
    color: var(--danger) !important;
    border-color: rgba(239, 68, 68, 0.3) !important;
    font-weight: 700;
}

.btn-delete-track:hover:not(:disabled) {
    background: var(--danger) !important;
    color: #ffffff !important;
}

.btn-delete-track:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.field-inline {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
}

.field-inline input[type="range"] {
    width: 80px;
}

.btn-solo-mute {
    padding: 2px 8px;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-sm);
}

.btn-solo-mute.is-active {
    background: var(--warning);
    color: #ffffff;
    border-color: var(--warning);
}

/* ───────────────────────────────────────────────────────────────────────────
   4. 동물의 숲 스타일 음높이 라인 스태프 (Staff Pitch Workspace)
   ─────────────────────────────────────────────────────────────────────────── */

.staff-workspace {
    background: var(--surface);
    border: 2px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 10px 14px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.04);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.staff-guide-hint {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 600;
    display: flex;
    align-items: center;
    padding: 2px 6px;
    background: var(--surface-2);
    border-radius: var(--radius-sm);
}

/* ───────────────────────────────────────────────────────────────────────────
   마디 네비게이션 & 확장 바 (Measure Navigation Bar)
   ─────────────────────────────────────────────────────────────────────────── */
.measure-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
}

.measure-tabs-cluster {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.measure-bar-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    white-space: nowrap;
}

.measure-tabs {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.measure-chip {
    padding: 3px 9px;
    font-size: 0.76rem;
    font-weight: 700;
    font-family: inherit;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.12s ease;
}

.measure-chip:hover {
    background: var(--surface-3);
    color: var(--text);
}

.measure-chip.is-active {
    background: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
}

.btn-measure-action {
    font-size: 0.74rem;
    padding: 3px 8px;
    font-weight: 700;
}

.badge-measure-steps {
    font-size: 0.75rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-muted);
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.staff-grid-wrapper {
    display: flex;
    gap: 6px;
    align-items: stretch;
    position: relative;
    user-select: none;
}

/* Y축: 음높이 라인 레이블 */
.staff-pitch-axis {
    flex: 0 0 125px;
    display: flex;
    flex-direction: column;
    margin-top: 24px; /* step header 높이 보정 */
    border-right: 2px solid var(--border-strong);
    padding-right: 8px;
}

.pitch-axis-row {
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
    font-size: 0.72rem;
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--text-muted);
    padding-right: 4px;
    border-bottom: 1px solid transparent;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-shrink: 0;
}

.pitch-axis-row.is-natural {
    color: var(--text-strong);
    font-weight: 800;
}

.pitch-axis-row.is-accidental {
    color: var(--text-faint);
    font-size: 0.68rem;
}

.pitch-axis-row.is-hold {
    color: #0096c7;
    font-weight: 800;
}

:root.dark-theme .pitch-axis-row.is-hold {
    color: #00e5ff;
}

.pitch-axis-row.is-rest {
    color: var(--danger);
    font-weight: 800;
}

.pitch-solfege {
    font-family: 'Jua', var(--font-sans);
    font-size: 0.78rem;
    flex-shrink: 0;
}

/* ───────────────────────────────────────────────────────────────────────────
   드럼 / 타악기 (Noise) 모드: 5행 레이아웃 최적화 (높이 38px로 넉넉하게 확장)
   ─────────────────────────────────────────────────────────────────────────── */
.staff-workspace[data-track-type="noise"] .pitch-axis-row,
.staff-workspace[data-track-type="noise"] .staff-cell {
    height: 38px;
}

.staff-workspace[data-track-type="noise"] .pitch-axis-row {
    font-size: 0.82rem;
    gap: 8px;
}

.staff-workspace[data-track-type="noise"] .pitch-solfege {
    font-size: 1.05rem;
}

.staff-workspace[data-track-type="noise"] .note-token {
    height: 28px;
    font-size: 0.75rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.25);
}

/* X축: 16스텝 보드 */
.staff-board {
    flex: 1;
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-sm);
    background: var(--surface-inset);
    border: 1px solid var(--border);
}

/* 스위핑 재생 헤드 바 */
.staff-playhead {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 0;
    background: rgba(0, 229, 255, 0.18);
    border-left: 2px solid #00e5ff;
    border-right: 2px solid #00e5ff;
    box-shadow: 0 0 10px rgba(0, 229, 255, 0.6);
    pointer-events: none;
    z-index: 10;
    transition: left 0.05s linear;
}

.staff-playhead::before {
    content: '▼';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.65rem;
    color: #00e5ff;
    text-shadow: 0 0 4px #00e5ff;
}

/* 16열 그리드 */
.staff-columns {
    display: grid;
    grid-template-columns: repeat(16, 1fr);
    width: 100%;
}

.staff-step-col {
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border);
    position: relative;
    transition: background 0.1s;
}

.staff-step-col:nth-child(4n) {
    border-right: 2px solid var(--border-strong);
}

.staff-step-col:last-child {
    border-right: none;
}

.staff-step-col.is-quarter-beat {
    background: rgba(0, 0, 0, 0.015);
}

:root.dark-theme .staff-step-col.is-quarter-beat {
    background: rgba(255, 255, 255, 0.02);
}

.staff-step-col.is-playing-step {
    background: rgba(0, 229, 255, 0.08) !important;
}

/* 스텝 열 헤더 (1~16) */
.staff-step-header {
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-family: var(--font-mono);
    font-weight: 800;
    color: var(--text-faint);
    background: var(--surface-2);
    border-bottom: 2px solid var(--border-strong);
    user-select: none;
    flex-shrink: 0;
}

.staff-step-col.is-quarter-beat .staff-step-header {
    color: var(--accent);
    font-weight: 900;
}

.staff-step-col.is-playing-step .staff-step-header {
    background: var(--accent);
    color: #ffffff;
}

/* 개별 음높이 셀 (동물의 숲 라인) */
.staff-cell {
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    cursor: pointer;
    border-bottom: 1px dashed var(--border);
    transition: background 0.1s;
    flex-shrink: 0;
}

.staff-cell.is-natural-line {
    border-bottom: 1px solid var(--border-strong);
}

.staff-cell.is-accidental-line {
    border-bottom: 1px dotted rgba(150, 150, 150, 0.25);
    background: rgba(0, 0, 0, 0.015);
}

:root.dark-theme .staff-cell.is-accidental-line {
    background: rgba(255, 255, 255, 0.015);
}

.staff-cell.is-hold-line {
    border-bottom: 2px dashed rgba(0, 180, 216, 0.4);
    background: rgba(0, 180, 216, 0.03);
}

:root.dark-theme .staff-cell.is-hold-line {
    border-bottom: 2px dashed rgba(0, 229, 255, 0.4);
    background: rgba(0, 229, 255, 0.04);
}

.staff-cell.is-rest-line {
    border-bottom: 2px solid rgba(239, 68, 68, 0.25);
    background: rgba(239, 68, 68, 0.02);
}

.staff-cell:hover {
    background: var(--surface-3);
}

/* 마우스 올렸을 때의 고스트 음표 */
.staff-cell:hover:not(.has-token)::after {
    content: '';
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    opacity: 0.35;
}

/* ───────────────────────────────────────────────────────────────────────────
   5. 동물의 숲 스타일 음표 토큰 (Note Token Badge)
   ─────────────────────────────────────────────────────────────────────────── */

.note-token {
    display: flex;
    align-items: center;
    justify-content: center;
    width: calc(100% - 6px);
    height: 18px;
    border-radius: var(--radius-pill);
    font-size: 0.65rem;
    font-family: var(--font-mono);
    font-weight: 800;
    color: #ffffff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    z-index: 2;
    user-select: none;
    transition: transform 0.08s ease;
    white-space: nowrap;
    overflow: hidden;
}

.note-token.token-hold {
    font-size: 0.62rem;
    letter-spacing: -0.02em;
    opacity: 0.96;
    border-style: dashed !important;
    border-width: 1.5px !important;
    box-shadow: 0 0 6px rgba(0, 229, 255, 0.35);
}

/* 채널별 동물의 숲 스타일 토큰 색상 테마 (최대 8트랙 지원) */
.token-ch1 { background: linear-gradient(135deg, #ffb703, #fb8500); border: 1px solid #e07a00; }
.token-ch2 { background: linear-gradient(135deg, #06d6a0, #118ab2); border: 1px solid #059669; }
.token-ch3 { background: linear-gradient(135deg, #9d4edd, #5a189a); border: 1px solid #3c096c; }
.token-ch4 { background: linear-gradient(135deg, #ff5c8a, #d90429); border: 1px solid #9b001a; }
.token-ch5 { background: linear-gradient(135deg, #4cc9f0, #4361ee); border: 1px solid #3a0ca3; }
.token-ch6 { background: linear-gradient(135deg, #ff70a6, #ff006e); border: 1px solid #c70039; }
.token-ch7 { background: linear-gradient(135deg, #b5179e, #7209b7); border: 1px solid #560bad; }
.token-ch8 { background: linear-gradient(135deg, #52b788, #2d6a4f); border: 1px solid #1b4332; }

/* 재생 시 음표 토큰 바운스 애니메이션 */
.staff-step-col.is-playing-step .note-token {
    transform: scale(1.18);
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.8);
    filter: brightness(1.25);
}

/* ───────────────────────────────────────────────────────────────────────────
   6. 전체 트랙 요약 미니 뷰 (Multi-track Overview)
   ─────────────────────────────────────────────────────────────────────────── */

.multitrack-overview {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    box-shadow: var(--shadow-sm);
}

.overview-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2px;
}

.overview-title {
    font-size: 0.78rem;
    font-weight: 800;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

.multitrack-rows {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.multitrack-row {
    display: grid;
    grid-template-columns: 96px 1fr;
    align-items: center;
    gap: 8px;
    padding: 3px 6px;
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.12s ease;
}

.multitrack-row:hover {
    background: var(--surface-3);
    border-color: var(--border);
}

.multitrack-row.is-active {
    background: var(--surface);
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}

.multitrack-label {
    font-size: 0.72rem;
    font-weight: 800;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.multitrack-row.ch1 .multitrack-label { color: #ff9f1c; }
.multitrack-row.ch2 .multitrack-label { color: #06d6a0; }
.multitrack-row.ch3 .multitrack-label { color: #9d4edd; }
.multitrack-row.ch4 .multitrack-label { color: #ef476f; }
.multitrack-row.ch5 .multitrack-label { color: #3a86ff; }
.multitrack-row.ch6 .multitrack-label { color: #ff006e; }
.multitrack-row.ch7 .multitrack-label { color: #8338ec; }
.multitrack-row.ch8 .multitrack-label { color: #00b4d8; }

.multitrack-steps {
    display: grid;
    grid-template-columns: repeat(var(--total-steps, 16), minmax(0, 1fr));
    gap: 2px;
}

.mini-step:nth-child(16n):not(:last-child) {
    margin-right: 3px;
    box-shadow: 1px 0 0 var(--border-strong);
}

.mini-step {
    height: 14px;
    background: var(--surface-3);
    border-radius: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.55rem;
    font-family: var(--font-mono);
    font-weight: 800;
    color: transparent;
    transition: all 0.08s;
}

.mini-step.is-active {
    color: #ffffff;
}

.mini-step.is-hold {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    font-size: 0.62rem;
    font-weight: 900;
    opacity: 0.9;
}

.multitrack-row.ch1 .mini-step.is-active { background-color: #ff9f1c; }
.multitrack-row.ch2 .mini-step.is-active { background-color: #06d6a0; }
.multitrack-row.ch3 .mini-step.is-active { background-color: #9d4edd; }
.multitrack-row.ch4 .mini-step.is-active { background-color: #ef476f; }
.multitrack-row.ch5 .mini-step.is-active { background-color: #3a86ff; }
.multitrack-row.ch6 .mini-step.is-active { background-color: #ff006e; }
.multitrack-row.ch7 .mini-step.is-active { background-color: #8338ec; }
.multitrack-row.ch8 .mini-step.is-active { background-color: #00b4d8; }

.mini-step.is-current {
    box-shadow: 0 0 6px #00e5ff;
    outline: 2px solid #00e5ff;
    z-index: 3;
}

/* ───────────────────────────────────────────────────────────────────────────
   7. 반응형 (Responsive adjustments)
   ─────────────────────────────────────────────────────────────────────────── */

@media (max-width: 991px) {
    .studio-topbar {
        flex-direction: column;
        align-items: stretch;
    }
    .transport-cluster, .slider-cluster, .bit-cluster, .export-cluster {
        justify-content: space-between;
    }
    .channel-header-row {
        flex-direction: column;
        align-items: stretch;
    }
    .channel-mixer-controls {
        margin-left: 0;
        justify-content: space-between;
    }
    .staff-pitch-axis {
        flex: 0 0 74px;
    }
}