/* css/styles.css */
:root {
    --bg-color: #0f172a;
    --panel-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #334155;
    
    --lh-color: #10b981;
    --rh-color: #f59e0b;
}

body, html {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
}

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

.app-header {
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-header h1 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.controls {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.control-group label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.control-group select,
.control-group input[type="number"] {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem;
    border-radius: 4px;
    outline: none;
}

.control-group.toggle.label {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    text-transform: none;
    color: var(--text-primary);
    margin-top: 0.5rem;
}

.btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
}

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

.btn-secondary {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover {
    background-color: var(--border-color);
}

.btn-danger {
    background-color: #ef4444;
}
.btn-danger:hover {
    background-color: #dc2626;
}

.btn-accent {
    background-color: #7c3aed;
}
.btn-accent:hover {
    background-color: #6d28d9;
}

.app-main {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow-y: auto;
}

/* Pattern Library (Top Grid) */
.pattern-library {
    width: 100%;
    flex: none;
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.library-header {
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.pattern-library h2 {
    padding: 1rem 2rem;
    margin: 0;
    font-size: 1.1rem;
    border-right: 1px solid var(--border-color);
}

.library-filters {
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

.library-tabs {
    display: flex;
    margin-left: 1rem;
}

.tab-btn {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    padding: 1rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
}

.tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

.pattern-list {
    flex: none;
    max-height: 400px;
    overflow-y: auto;
    padding: 1.5rem 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

.pattern-block {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 6px;
    cursor: grab;
    user-select: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.pattern-block:active {
    cursor: grabbing;
}

.pattern-block.lh { border-left: 4px solid var(--lh-color); }
.pattern-block.rh { border-left: 4px solid var(--rh-color); }

.pattern-label {
    font-weight: 600;
    font-size: 1.1rem;
}

.pattern-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    gap: 0.5rem;
}

.pattern-desc {
    font-size: 0.85rem;
    color: #cbd5e1;
    line-height: 1.4;
}

.pattern-genres {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    margin-top: 0.25rem;
}

.genre-tag {
    background-color: rgba(255, 255, 255, 0.1);
    color: #e2e8f0;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.7rem;
    text-transform: capitalize;
}

/* Builder Area */
.routine-builder {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

/* Routine Builder header row */
.routine-header {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 1rem 2rem 0;
}

.routine-header h2 {
    margin: 0;
    flex-shrink: 0;
}

/* Lesson Title input */
.lesson-title-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
}

.lesson-title-group label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.lesson-title-input {
    flex: 1;
    max-width: 360px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.45rem 0.75rem;
    border-radius: 4px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}
.lesson-title-input:focus {
    border-color: var(--accent-color);
}
.lesson-title-input::placeholder {
    color: var(--text-secondary);
    font-style: italic;
}

/* Line description row (above each row of 4 measures) */
.line-description-row {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.4rem 0 0.2rem;
    border-top: 1px solid var(--border-color);
    margin-top: 0.5rem;
}

.line-description-row:first-child {
    border-top: none;
    margin-top: 0;
}

.line-desc-label {
    font-size: 0.72rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.line-description-input {
    flex: 1;
    background-color: transparent;
    border: 1px solid transparent;
    border-bottom: 1px dashed var(--border-color);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-style: italic;
    padding: 0.2rem 0.4rem;
    border-radius: 0;
    outline: none;
    transition: border-color 0.2s;
}
.line-description-input:focus {
    border-bottom-color: var(--accent-color);
    background-color: rgba(0,0,0,0.15);
    border-radius: 3px;
}
.line-description-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

/* Recommended BPM state */
#bpm-input.bpm-recommended {
    border-color: #10b981;
    color: #10b981;
    cursor: not-allowed;
    opacity: 0.85;
}



.timeline-controls {
    padding: 1rem 2rem;
    display: flex;
    gap: 1rem;
}

.measures-container {
    padding: 0 2rem 2rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    min-height: 200px;
}

.measure {
    background-color: var(--panel-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.measure-header {
    padding: 0.5rem 1rem;
    background-color: rgba(0,0,0,0.2);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
}

.measure-title {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: bold;
    flex: 1;
    padding: 0.2rem;
    border-radius: 3px;
    width: 100%;
}
.measure-title:focus {
    border-color: var(--accent-color);
    outline: none;
    background: rgba(0,0,0,0.2);
}

.measure-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.measure-chord-select {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.25rem 0.4rem;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}
.measure-chord-select:hover,
.measure-chord-select:focus {
    border-color: var(--accent-color);
}

.duplicate-measure,
.remove-measure {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.2rem;
}
.duplicate-measure:hover { color: var(--accent-hover); }
.remove-measure:hover { color: #ef4444; }

.chord-lock-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.2rem;
    font-size: 0.9rem;
    transition: color 0.2s;
}
.chord-lock-btn:hover { color: var(--text-primary); }
.chord-lock-btn.locked { color: #f59e0b; }

.measure-drop-zone {
    padding: 0.75rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-height: 120px;
    position: relative;
}

.drop-placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-secondary);
    font-size: 0.85rem;
    pointer-events: none;
    opacity: 0.5;
}

/* Pattern blocks inside the measure */
.measure-drop-zone .pattern-block {
    flex: 1;
    margin: 0;
    width: auto;
    min-height: 50px;
    background-color: rgba(255, 255, 255, 0.05);
}

/* If only one pattern, it fills more space */
.measure-drop-zone .pattern-block:only-of-type {
    min-height: 100px;
}

.measure-drop-zone .pattern-block .pattern-label {
    font-size: 1.2rem;
    word-break: break-word;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.85); /* Dark background overlay */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 90vw;
    max-width: 1200px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    overflow: hidden;
}

.modal-content-sm {
    max-width: 400px;
}

.modal-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: rgba(0,0,0,0.2);
}

.modal-header h2 {
    margin: 0;
    font-size: 1.25rem;
}

.modal-actions {
    display: flex;
    gap: 1rem;
}

.modal-body {
    padding: 2rem;
    overflow-y: auto;
    background-color: #fff; /* White background for sheet music */
    color: #000;
}

#sheet-music-container {
    width: 100%;
    overflow-x: auto;
    min-height: 200px;
}