/* ==========================================
   HarmonyLab Styles v1.4.5
   ========================================== */

:root {
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --border: #334155;
    --tonic: #22c55e;
    --subdominant: #3b82f6;
    --dominant: #ef4444;
    --secondary: #f59e0b;
    --chromatic: #8b5cf6;
    --diminished: #6b7280;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
}

/* ==========================================
   NAVIGATION BAR
   ========================================== */

.main-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: #0b1120;
    border-bottom: 1px solid var(--border);
}

.nav-brand {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
}

.nav-brand:hover {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-link {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.15s;
}

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

.nav-link.active {
    color: var(--accent);
    font-weight: 600;
}

.nav-link.disabled {
    color: var(--border);
    cursor: not-allowed;
    pointer-events: auto; /* Required for tooltip to show */
    opacity: 0.5;
}

.nav-link.disabled:hover {
    color: var(--border);
    text-decoration: none;
}

.nav-version {
    font-size: 0.7rem;
    background: var(--bg-card);
    color: var(--text-muted);
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 500;
}

/* Auth UI */
.nav-auth {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-size: 0.85rem;
    color: var(--text);
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ==========================================
   HEADER
   ========================================== */

header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

header h1 {
    font-size: 1.4rem;
    font-weight: 700;
}

.back-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
    margin-right: 8px;
}

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

.version-badge {
    font-size: 0.7rem;
    background: var(--accent);
    color: white;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 4px;
}

.song-info {
    display: flex;
    gap: 12px;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.key-badge {
    background: rgba(59,130,246,0.2);
    color: var(--accent);
    padding: 1px 8px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.8rem;
}

.key-badge.detected {
    background: rgba(34,197,94,0.2);
    color: var(--tonic);
}

.genre-badge {
    background: rgba(139,92,246,0.2);
    color: var(--chromatic);
    padding: 1px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
}

/* ==========================================
   MAIN
   ========================================== */

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 24px;
}

/* ==========================================
   TOOLBAR (song list page)
   ========================================== */

.toolbar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.search-input, .filter-select {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
}

.search-input { flex: 1; }
.search-input:focus, .filter-select:focus {
    outline: none;
    border-color: var(--accent);
}

/* ==========================================
   SONGS GRID
   ========================================== */

.songs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 12px;
}

.song-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    text-decoration: none;
    color: var(--text);
    transition: border-color 0.15s, transform 0.15s;
}

.song-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.song-title {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 6px;
}

.song-meta {
    display: flex;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==========================================
   CONTROLS BAR
   ========================================== */

.controls-bar {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 12px 16px;
    background: var(--bg-card);
    border-radius: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.view-toggle {
    display: flex;
    gap: 12px;
    font-size: 0.9rem;
}

.view-toggle label {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
}

.analysis-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.analysis-controls label {
    color: var(--text-muted);
}

.analysis-controls select {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
}

.detected-key {
    color: var(--accent);
    font-weight: 600;
}

.confidence {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ==========================================
   BUTTONS
   ========================================== */

.btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 6px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background 0.15s;
}

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

.btn-sm {
    padding: 4px 10px;
    font-size: 0.8rem;
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.btn-primary:hover { background: #2563eb; }

.btn-danger {
    background: #dc2626;
    border-color: #dc2626;
    color: white;
}

.btn-danger:hover { background: #b91c1c; }

/* ==========================================
   FUNCTION LEGEND
   ========================================== */

.function-legend {
    display: flex;
    gap: 16px;
    padding: 10px 16px;
    background: var(--bg-card);
    border-radius: 6px;
    font-size: 0.85rem;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

.legend-dot.tonic { background: var(--tonic); }
.legend-dot.subdominant { background: var(--subdominant); }
.legend-dot.dominant { background: var(--dominant); }
.legend-dot.secondary { background: var(--secondary); }
.legend-dot.chromatic { background: var(--chromatic); }

/* ==========================================
   PATTERNS
   ========================================== */

.patterns-info {
    padding: 10px 16px;
    background: rgba(59,130,246,0.1);
    border: 1px solid rgba(59,130,246,0.3);
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 0.85rem;
}

.pattern-tag {
    display: inline-block;
    background: rgba(59,130,246,0.2);
    color: var(--accent);
    padding: 2px 8px;
    border-radius: 4px;
    margin-left: 6px;
    font-size: 0.8rem;
}

/* ==========================================
   SECTIONS & MEASURES
   ========================================== */

.section-block {
    margin-bottom: 24px;
}

.section-header {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-muted);
    padding: 6px 0;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--border);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.measures-row {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.measure-block {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px;
    min-width: 100px;
}

.measure-number {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.measure-chords {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

/* ==========================================
   CHORD CARDS
   ========================================== */

.chord-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px 14px;
    border-radius: 8px;
    min-width: 70px;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
    background: var(--bg);
    border: 1px solid var(--border);
}

.chord-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.chord-card .chord-symbol {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
}

.chord-card .roman-numeral {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    font-style: italic;
    margin-top: 2px;
}

.chord-card .secondary-target {
    font-size: 0.7rem;
    color: var(--secondary);
    margin-top: 2px;
}

/* Function-colored chord cards */
.chord-card.chord-function-tonic {
    background: linear-gradient(135deg, rgba(34,197,94,0.2), rgba(34,197,94,0.05));
    border-left: 4px solid var(--tonic);
}

.chord-card.chord-function-subdominant {
    background: linear-gradient(135deg, rgba(59,130,246,0.2), rgba(59,130,246,0.05));
    border-left: 4px solid var(--subdominant);
}

.chord-card.chord-function-dominant {
    background: linear-gradient(135deg, rgba(239,68,68,0.2), rgba(239,68,68,0.05));
    border-left: 4px solid var(--dominant);
}

.chord-card.chord-function-secondary {
    background: linear-gradient(135deg, rgba(245,158,11,0.2), rgba(245,158,11,0.05));
    border-left: 4px solid var(--secondary);
}

.chord-card.chord-function-chromatic {
    background: linear-gradient(135deg, rgba(139,92,246,0.2), rgba(139,92,246,0.05));
    border-left: 4px solid var(--chromatic);
}

.chord-card.chord-function-diminished {
    background: linear-gradient(135deg, rgba(107,114,128,0.2), rgba(107,114,128,0.05));
    border-left: 4px solid var(--diminished);
}

.chord-card.chord-function-unknown {
    background: var(--bg);
    border-left: 4px solid var(--text-muted);
}

.chord-card.is-override {
    border-style: dashed;
}

.chord-card.is-pivot {
    box-shadow: 0 0 0 2px var(--secondary);
}

.chord-card.pattern-highlight {
    position: relative;
}

.chord-card.pattern-highlight::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 10%;
    right: 10%;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
}

/* ==========================================
   MODAL
   ========================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 90%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 1.1rem;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover { color: var(--text); }

.modal-body {
    padding: 20px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 16px 20px;
    border-top: 1px solid var(--border);
}

.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.input-readonly {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Modal Tabs */
.modal-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
}

.modal-tabs .tab {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 12px 16px;
    font-size: 0.9rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
}

.modal-tabs .tab:hover {
    color: var(--text);
}

.modal-tabs .tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    font-weight: 600;
}

/* MIDI Preview */
.midi-info {
    background: var(--bg);
    border-radius: 6px;
    padding: 12px;
    margin-bottom: 12px;
}

.midi-stat {
    font-size: 0.85rem;
    padding: 3px 0;
}

.midi-chords-preview {
    margin-bottom: 12px;
}

.midi-chords-preview label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.midi-chords-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.midi-chord-chip {
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-family: monospace;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text);
}

/* ==========================================
   STATUS MESSAGES
   ========================================== */

.loading, .empty, .error {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.error {
    color: var(--dominant);
}

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 640px) {
    header { padding: 12px 16px; }
    main { padding: 12px 16px; }

    .controls-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .analysis-controls {
        flex-wrap: wrap;
    }

    .function-legend {
        gap: 10px;
    }

    .measures-row {
        gap: 4px;
    }

    .measure-block {
        min-width: 80px;
    }
}