:root {
    /* Color Palette - Future Core Theme */
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    /* Slightly lighter for panels */
    --bg-tertiary: #1e293b;
    /* Inputs, active states */
    --bg-hover: #334155;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border-color: #334155;

    /* Accents */
    --accent-color: #06b6d4;
    --accent-hover: #22d3ee;
    --accent-glow: rgba(6, 182, 212, 0.4);
    --accent-text: #0a0f1a;

    --play-color: #22c55e;
    --play-glow: rgba(34, 197, 94, 0.4);

    --danger-color: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.4);

    --grid-line: rgba(6, 182, 212, 0.08);
    /* Faint cyan grid */
    --grid-line-light: rgba(0, 229, 255, 0.03);

    --playhead-color: #ff2a6d;

    --sidebar-width: 250px;
    --header-height: 60px;
    --footer-height: 70px;
    --transition-speed: 0.2s;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    /* Subtle radial gradient background */
    background-image: radial-gradient(circle at top center, #1a1a20 0%, #0a0a0c 100%);
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Material Symbols - Make them look sharper */
.material-symbols-outlined {
    font-family: 'Material Symbols Outlined' !important;
    font-variation-settings:
        'FILL' 0,
        'wght' 300,
        'GRAD' 0,
        'opsz' 24
}

/* DAW Style Header */
.app-header {
    min-height: var(--header-height);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    padding: 0 12px;
    gap: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    overflow-x: auto;
    font-family: 'JetBrains Mono', monospace;
}

.toolbar-zone {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* zone-1, zone-2 は固定幅（縮まない） */
.zone-1 {
    flex-shrink: 0;
}
.zone-2 {
    flex-shrink: 0;
}

/* zone-3はアイコンのみ表示 + 残りスペースを使って内部スクロール */
.zone-3 {
    flex: 1 1 0;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}
.zone-3 .btn-label {
    display: none;
}
.zone-3 .tool-btn.with-label {
    min-width: 32px;
    padding: 4px;
}
.zone-3 .tool-group {
    gap: 2px;
}
.zone-3 .toolbar-separator-light {
    margin: 0 2px;
}

.toolbar-separator {
    width: 2px;
    height: 36px;
    background-color: var(--bg-secondary);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    margin: 0 8px;
}

.toolbar-separator-light {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 4px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 100px;
    height: 100%;
    min-height: var(--header-height);
    border-right: 1px solid var(--border-color);
    margin-right: 12px;
    padding: 0 8px;
    background: linear-gradient(135deg, rgba(6,182,212,0.06) 0%, transparent 100%);
}

.logo img {
    width: 100%;
    height: auto;
    max-height: 56px;
    object-fit: contain;
}

.tool-group {
    display: flex;
    gap: 4px;
    align-items: center;
}

/* Button Styling - DAW Style */
.tool-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.1s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 2px;
    min-width: 32px;
    min-height: 32px;
}

.btn-label {
    font-size: 0.55rem;
    font-weight: 500;
    line-height: 1;
    margin-top: -1px;
}

.tool-btn.small-btn {
    padding: 2px 6px;
    font-size: 0.75rem;
    height: 24px;
    font-weight: 600;
    flex-direction: row;
}

.tool-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.tool-btn:active {
    background: var(--accent-color);
    color: var(--accent-text);
    transform: translateY(1px);
}

/* Specific Transport Buttons */
.transport-group .tool-btn {
    padding: 4px 12px;
    min-width: 48px;
}
.transport-group .material-symbols-outlined {
    font-size: 28px;
}

.btn-play {
    color: var(--play-color);
}
.btn-play:hover {
    box-shadow: 0 0 10px var(--play-glow);
    border-color: var(--play-color);
}

.btn-stop {
    color: var(--text-primary);
}

.btn-record {
    color: var(--danger-color);
}
.btn-record:hover {
    box-shadow: 0 0 10px var(--danger-glow);
    border-color: var(--danger-color);
}

.btn-danger-small {
    color: var(--danger-color);
}
.btn-danger-small .material-symbols-outlined {
    font-size: 18px;
}

.tool-select {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 4px;
    outline: none;
    cursor: pointer;
    font-size: 0.85rem;
    font-family: 'JetBrains Mono', monospace;
}

.tool-select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Song Info Inputs */
.tool-input,
.tool-input-small {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    border-radius: 4px;
    outline: none;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.tool-input:focus,
.tool-input-small:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 8px var(--accent-glow);
    background-color: var(--bg-hover);
}

.tool-input {
    width: 180px;
}

.tool-input-small {
    width: 50px;
    text-align: center;
}

/* Mode Toggle - Segmented Control Style */
.mode-toggle-group {
    background: var(--bg-tertiary);
    padding: 2px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    gap: 0 !important;
}

.mode-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px 16px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 500;
    transition: all var(--transition-speed);
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mode-btn:first-child {
    border-radius: 4px;
}

.mode-btn:last-child {
    border-radius: 4px;
}

/* Reset from old style */

.mode-btn:hover:not(.active) {
    color: var(--text-primary);
}

.mode-btn.active {
    background-color: var(--accent-color);
    color: var(--accent-text);
    box-shadow: 0 0 10px var(--accent-glow);
    font-weight: 700;
}

/* Main Workspace */
.workspace {
    flex: 1;
    position: relative;
    overflow-y: auto;
    overflow-x: hidden;
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
}

.hidden {
    display: none !important;
}

/* Modal - Futuristic Overlay */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(5, 5, 7, 0.85);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9000;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--accent-color);
    box-shadow: 0 0 40px rgba(6, 182, 212, 0.2), 0 0 80px rgba(6, 182, 212, 0.08);
    border-radius: 8px;
    padding: 28px 32px;
    min-width: 340px;
    max-width: 500px;
    width: 90%;
}

.modal-content h2 {
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 16px;
}

.modal-content input {
    width: 100%;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 14px;
    border-radius: 4px;
    font-size: 1rem;
    font-family: 'JetBrains Mono', monospace;
    outline: none;
    margin-bottom: 20px;
}

.modal-content input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-glow);
}

.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

.modal-actions button {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    transition: all 0.15s;
}

.modal-actions button:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.modal-actions button.primary {
    background-color: var(--accent-color);
    color: var(--accent-text);
    border-color: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-glow);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.modal-actions button.primary:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 0 25px var(--accent-glow);
}

/* Metronome & Record Buttons Active States */
#btn-metronome.active {
    color: var(--accent-color);
    text-shadow: 0 0 8px var(--accent-color);
    background: rgba(0, 229, 255, 0.1);
    box-shadow: inset 0 0 10px rgba(0, 229, 255, 0.1);
}

.record-btn.recording {
    background-color: transparent;
    color: var(--danger-color);
    box-shadow: inset 0 0 15px var(--danger-glow), 0 0 10px var(--danger-glow);
    border: 1px solid var(--danger-color);
    animation: neon-pulse 1.5s infinite alternate;
}

@keyframes neon-pulse {
    from {
        box-shadow: 0 0 5px var(--danger-glow), inset 0 0 5px var(--danger-glow);
        text-shadow: 0 0 5px var(--danger-color);
    }

    to {
        box-shadow: 0 0 20px var(--danger-glow), inset 0 0 10px var(--danger-glow);
        text-shadow: 0 0 15px var(--danger-color);
    }
}

/* Unified Play Button Animation */
.tool-btn.playing {
    color: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-glow), inset 0 0 10px rgba(0, 229, 255, 0.2);
    border-color: var(--accent-color);
}

/* Button SVG Icon Filtering */
.btn-icon {
    width: 22px;
    height: 22px;
    filter: invert(0.7) sepia(0.2) saturate(0.8); /* 明るいブルーグレー */
    flex-shrink: 0;
}
.tool-btn:hover .btn-icon {
    filter: invert(1); /* ホバー時は白 */
}
.btn-play .btn-icon {
    filter: invert(1) sepia(1) saturate(5) hue-rotate(90deg); /* 緑色 */
    width: 22px;
    height: 22px;
}
.btn-record .btn-icon {
    filter: invert(1) sepia(1) saturate(5) hue-rotate(320deg); /* 赤色 */
}

/* Waveform Wrapper */
.waveform-wrapper {
    display: flex;
    flex-direction: row;
    width: 100%;
    position: relative;
    flex-shrink: 0;
    border-bottom: 1px solid var(--border-color);
}

/* View Toggle Bar - 左サイドの縦並びボタン */
.view-toggle-bar {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    flex-shrink: 0;
    width: 150px;
    align-items: stretch;
    justify-content: flex-start;
}

.view-tab {
    width: 100%;
    min-height: 46px;
    padding: 12px 4px;
    border-radius: 0;
    border-left: none;
    border-right: none;
    border-top: none;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-align: center;
    justify-content: center;
}

.view-tab.active {
    background: var(--accent-color) !important;
    color: var(--accent-text) !important;
    border-color: var(--accent-color) !important;
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Waveform Container */
.waveform-container {
    flex: 1;
    height: 80px;
    min-height: 40px;
    background: #080d14;
    overflow: hidden;
}

/* Resize Handle */
.waveform-resize-handle {
    width: 100%;
    height: 6px;
    cursor: ns-resize;
    flex-shrink: 0;
    background: var(--border-color);
    position: relative;
    transition: background 0.15s;
}

.waveform-resize-handle:hover {
    background: var(--accent-color);
}

.waveform-resize-handle::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 36px;
    height: 2px;
    border-radius: 1px;
    background: rgba(255,255,255,0.3);
}

/* スライダー本体 */
.volume-mixer input[type="range"] {
    -webkit-appearance: none;
    width: 100px;
    height: 3px;
    background: var(--border-color);
    border-radius: 2px;
    outline: none;
}
/* スライダーのつまみ */
.volume-mixer input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    box-shadow: 0 0 4px var(--accent-color);
}
/* ホバー時 */
.volume-mixer input[type="range"]:hover::-webkit-slider-thumb {
    background: #fff;
    box-shadow: 0 0 8px var(--accent-color);
}
/* ミキサー全体 */
.volume-mixer {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 8px auto;
    width: fit-content;
    font-family: 'JetBrains Mono', monospace;
}
/* ラベル */
.mixer-channel-label {
    font-size: 0.6rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    min-width: 44px;
}

/* Fretboard wrapper */
.fretboard-wrapper {
    display: flex;
    align-items: stretch;
    overflow: hidden;
    margin: 10px 0;
}
.fretboard-head, .fretboard-body {
    object-fit: cover;
    flex-shrink: 0;
}
.fretboard-head { width: 80px; }
.fretboard-body { width: 120px; }

/* Grid Cell Placeholders */
.grid-cell-placeholder {
    position: absolute;
    width: 20px;
    height: 20px;
    transform: translate(-50%, -50%);
    background-color: transparent;
    z-index: 100;
    cursor: pointer;
    border-radius: 50%;
}

.grid-cell-placeholder:hover {
    background-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

.grid-cell-placeholder.cursor-active {
    background-color: var(--accent-color);
    box-shadow: 0 0 15px var(--accent-color);
}