/**
 * Progression Builder CSS
 *
 * Styles for the reusable Progression Builder component.
 * Follows the SBN design system (dark text, warm accents, rounded cards).
 *
 * @package SBN_Course_Player
 * @since   7.8.5
 */

/* ============================================================
   CONTAINER
   ============================================================ */

.sbn-pb {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.sbn-pb-loading,
.sbn-pb-error {
    padding: 24px;
    text-align: center;
    color: #6b7280;
    font-size: 13px;
}

.sbn-pb-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid #e5e7eb;
    border-top-color: #6b7280;
    border-radius: 50%;
    animation: sbn-pb-spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

@keyframes sbn-pb-spin {
    to { transform: rotate(360deg); }
}

/* ============================================================
   HEADER (key selector + suggest button)
   ============================================================ */

.sbn-pb-header {
    padding: 0 0 12px;
    border-bottom: 1px solid #f3f4f6;
    margin-bottom: 16px;
}

.sbn-pb-key-row {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.sbn-pb-key-label {
    font-size: 11px;
    font-weight: 600;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.sbn-pb-key-select {
    border: 1px solid #d1d5db;
    border-radius: 6px;
    padding: 4px 8px;
    font-size: 13px;
    font-weight: 600;
    color: #111827;
    background: #fff;
    cursor: pointer;
    outline: none;
    min-width: 52px;
}

.sbn-pb-key-select:focus {
    border-color: #e85d3b;
    box-shadow: 0 0 0 2px rgba(232,93,59,0.15);
}

.sbn-pb-btn {
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    padding: 5px 12px;
    transition: background 0.15s, color 0.15s;
}

.sbn-pb-btn-group {
    display: flex;
    gap: 6px;
    margin-left: auto;
}

.sbn-pb-btn-suggest {
    background: #111827;
    color: #fff;
}

.sbn-pb-btn-suggest:hover {
    background: #374151;
}

.sbn-pb-btn-clear {
    background: #f3f4f6;
    border: 1px solid #e5e7eb;
    color: #6b7280;
}

.sbn-pb-btn-clear:hover {
    background: #e5e7eb;
    color: #111827;
}

/* Segmented control */
.sbn-pb-seg {
    display: flex;
    border: 1px solid #d1d5db;
    border-radius: 7px;
    overflow: hidden;
    flex-shrink: 0;
}

.sbn-pb-seg-btn {
    background: #fff;
    border: none;
    border-right: 1px solid #d1d5db;
    color: #374151;
    cursor: pointer;
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    transition: background 0.12s, color 0.12s;
    white-space: nowrap;
}

.sbn-pb-seg-btn:last-child {
    border-right: none;
}

.sbn-pb-seg-btn:hover:not(.is-active) {
    background: #f3f4f6;
    color: #111827;
}

.sbn-pb-seg-btn.is-active {
    background: #111827;
    color: #fff;
}

/* Pill toggles — inline in key-row */
.sbn-pb-toggle {
    background: #f3f4f6;
    border: 1px solid #e5e7eb;
    border-radius: 20px;
    color: #6b7280;
    cursor: pointer;
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    transition: background 0.12s, border-color 0.12s, color 0.12s;
    white-space: nowrap;
}

.sbn-pb-toggle:hover:not(.is-active) {
    background: #e5e7eb;
    color: #374151;
}

.sbn-pb-toggle.is-active {
    background: #e85d3b;
    border-color: #e85d3b;
    color: #fff;
}

/* ============================================================
   CHORD SLOTS ROW
   ============================================================ */

.sbn-pb-slots {
    display: flex;
    align-items: flex-start;
    gap: 0;
    overflow-x: auto;
    padding: 4px 0 8px;
    -webkit-overflow-scrolling: touch;
}

.sbn-pb-slot {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 80px;
    max-width: 110px;
    padding: 10px 8px;
    border-radius: 10px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: background 0.15s;
    flex-shrink: 0;
}

.sbn-pb-slot:hover {
    background: #f9fafb;
}

.sbn-pb-slot.is-active {
    background: #fff7f5;
}

.sbn-pb-slot.has-selection {
    background: #fff;
}

.sbn-pb-slot.has-selection.is-active {
    background: #fff7f5;
}

/* Chord name */
.sbn-pb-slot-name {
    margin-bottom: 6px;
    text-align: center;
}

.sbn-pb-chord-name {
    font-size: 14px;
    font-weight: 700;
    color: #111827;
    font-family: 'SBN Chord', Georgia, serif;
    letter-spacing: 0.01em;
}

.sbn-pb-slot-error {
    font-size: 12px;
    color: #ef4444;
    font-style: italic;
}

/* Placeholder (no selection yet) */
.sbn-pb-slot-placeholder {
    width: 60px;
    height: 68px;
    border: 2px dashed #d1d5db;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.sbn-pb-slot-placeholder-text {
    font-size: 10px;
    color: #9ca3af;
    line-height: 1.3;
}

.sbn-pb-slot-none {
    border-color: #fca5a5;
}

.sbn-pb-slot-none .sbn-pb-slot-placeholder-text {
    color: #ef4444;
}

/* Mini diagram (selected voicing in slot) */
.sbn-pb-mini-diagram {
    width: 60px;
    background: #fff;
    border-radius: 4px;
    position: relative;
}

.sbn-pb-mini-diagram .sbn-fretboard-mini {
    transform: scale(0.68);
    transform-origin: top center;
    margin-bottom: -6px;
}

.sbn-pb-mini-text {
    width: 64px;
    height: 68px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #f3f4f6;
    border-radius: 6px;
    font-size: 10px;
    color: #374151;
    font-weight: 600;
    gap: 4px;
}

.sbn-pb-mini-fret-info {
    font-size: 9px;
    color: #9ca3af;
}

/* ============================================================
   VOICE LEADING CONNECTORS
   ============================================================ */

.sbn-pb-vl-connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    padding-top: 26px; /* align with chord name */
    flex-shrink: 0;
}

.sbn-pb-vl-arrow {
    font-size: 14px;
    color: #d1d5db;
}

.sbn-pb-vl-empty .sbn-pb-vl-arrow { color: #e5e7eb; }

.sbn-pb-vl-excellent .sbn-pb-vl-arrow { color: #22c55e; }
.sbn-pb-vl-good .sbn-pb-vl-arrow { color: #3b82f6; }
.sbn-pb-vl-fair .sbn-pb-vl-arrow { color: #f59e0b; }
.sbn-pb-vl-rough .sbn-pb-vl-arrow { color: #ef4444; }

/* ============================================================
   VOICING PICKER PANEL
   ============================================================ */

.sbn-pb-picker {
    margin-top: 12px;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    background: #fafafa;
    overflow: hidden;
}

.sbn-pb-picker-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    background: #f3f4f6;
    border-bottom: 1px solid #e5e7eb;
}

.sbn-pb-picker-title {
    font-size: 12px;
    color: #374151;
}

.sbn-pb-picker-title strong {
    font-weight: 700;
    color: #111827;
    font-family: 'SBN Chord', Georgia, serif;
}

.sbn-pb-picker-close {
    background: none;
    border: none;
    font-size: 14px;
    color: #9ca3af;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: color 0.15s, background 0.15s;
}

.sbn-pb-picker-close:hover {
    color: #111827;
    background: #e5e7eb;
}

/* Filter bar */
.sbn-pb-picker-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 8px 14px;
    border-bottom: 1px solid #f3f4f6;
}

.sbn-pb-filter-btn {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
    color: #6b7280;
    cursor: pointer;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    transition: background 0.12s, border-color 0.12s, color 0.12s;
}

.sbn-pb-filter-btn:hover {
    background: #f3f4f6;
    color: #111827;
}

.sbn-pb-filter-btn.is-active {
    background: #111827;
    border-color: #111827;
    color: #fff;
}

.sbn-pb-filter-count {
    font-size: 10px;
    opacity: 0.7;
    margin-left: 1px;
}

/* Voicing grid */
.sbn-pb-picker-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 8px;
    padding: 12px 14px;
    max-height: 340px;
    overflow-y: auto;
}

/* Individual voicing card */
.sbn-pb-voicing-card {
    background: #fff;
    border: none;
    border-radius: 8px;
    padding: 4px 4px 6px;
    cursor: pointer;
    transition: box-shadow 0.15s, background 0.15s;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.sbn-pb-voicing-card:hover {
    background: #f9fafb;
    box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}

.sbn-pb-voicing-card.is-selected {
    background: #fff7f5;
    box-shadow: 0 0 0 2px #e85d3b;
}

.sbn-pb-card-fretboard {
    width: 100%;
    background: #fff;
    border-radius: 4px;
}

.sbn-pb-card-fretboard .sbn-fretboard-mini {
    transform: scale(0.75);
    transform-origin: top center;
    margin-bottom: -8px;
}

/* Chord name label above diagram */
.sbn-pb-card-name {
    font-size: 12px;
    font-weight: 700;
    color: #111827;
    text-align: center;
    margin-bottom: 4px;
    font-family: 'SBN Chord', Georgia, serif;
    line-height: 1.2;
}

/* ============================================================
   LARGE SLOTS FOR SHORT PROGRESSIONS (≤4 chords)
   The base sbn-fretboard-mini renders at max-width:110px scale 1.0.
   Default builder: 64px container, scale 0.72.
   For ≤4 chords we expand to ~card size.
   ============================================================ */

/* 1–4 chords: large card-style slots */
.sbn-pb-slots[data-count="1"] .sbn-pb-slot,
.sbn-pb-slots[data-count="2"] .sbn-pb-slot,
.sbn-pb-slots[data-count="3"] .sbn-pb-slot,
.sbn-pb-slots[data-count="4"] .sbn-pb-slot {
    min-width: 120px;
    max-width: 150px;
    padding: 12px 10px;
}

.sbn-pb-slots[data-count="1"] .sbn-pb-chord-name,
.sbn-pb-slots[data-count="2"] .sbn-pb-chord-name,
.sbn-pb-slots[data-count="3"] .sbn-pb-chord-name,
.sbn-pb-slots[data-count="4"] .sbn-pb-chord-name {
    font-size: 18px;
}

/* Expand the mini-diagram wrapper */
.sbn-pb-slots[data-count="1"] .sbn-pb-mini-diagram,
.sbn-pb-slots[data-count="2"] .sbn-pb-mini-diagram,
.sbn-pb-slots[data-count="3"] .sbn-pb-mini-diagram,
.sbn-pb-slots[data-count="4"] .sbn-pb-mini-diagram {
    width: 110px;
}

/* Scale fretboard up to full size (1.0) */
.sbn-pb-slots[data-count="1"] .sbn-pb-mini-diagram .sbn-fretboard-mini,
.sbn-pb-slots[data-count="2"] .sbn-pb-mini-diagram .sbn-fretboard-mini,
.sbn-pb-slots[data-count="3"] .sbn-pb-mini-diagram .sbn-fretboard-mini,
.sbn-pb-slots[data-count="4"] .sbn-pb-mini-diagram .sbn-fretboard-mini {
    transform: scale(1.0);
    transform-origin: top center;
    margin-bottom: 0;
}

/* Expand placeholder to match */
.sbn-pb-slots[data-count="1"] .sbn-pb-slot-placeholder,
.sbn-pb-slots[data-count="2"] .sbn-pb-slot-placeholder,
.sbn-pb-slots[data-count="3"] .sbn-pb-slot-placeholder,
.sbn-pb-slots[data-count="4"] .sbn-pb-slot-placeholder {
    width: 100px;
    height: 120px;
}

.sbn-pb-slots[data-count="1"] .sbn-pb-slot-placeholder-text,
.sbn-pb-slots[data-count="2"] .sbn-pb-slot-placeholder-text,
.sbn-pb-slots[data-count="3"] .sbn-pb-slot-placeholder-text,
.sbn-pb-slots[data-count="4"] .sbn-pb-slot-placeholder-text {
    font-size: 12px;
}

/* VL connector spacing for large slots */
.sbn-pb-slots[data-count="1"] .sbn-pb-vl-connector,
.sbn-pb-slots[data-count="2"] .sbn-pb-vl-connector,
.sbn-pb-slots[data-count="3"] .sbn-pb-vl-connector,
.sbn-pb-slots[data-count="4"] .sbn-pb-vl-connector {
    min-width: 36px;
    padding-top: 36px;
}

.sbn-pb-slots[data-count="1"] .sbn-pb-vl-arrow,
.sbn-pb-slots[data-count="2"] .sbn-pb-vl-arrow,
.sbn-pb-slots[data-count="3"] .sbn-pb-vl-arrow,
.sbn-pb-slots[data-count="4"] .sbn-pb-vl-arrow {
    font-size: 18px;
}

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

@media (max-width: 600px) {
    .sbn-pb-slots {
        gap: 0;
    }

    .sbn-pb-slot {
        min-width: 66px;
        max-width: 90px;
        padding: 8px 4px;
    }

    .sbn-pb-chord-name {
        font-size: 12px;
    }

    .sbn-pb-vl-connector {
        min-width: 20px;
    }

    .sbn-pb-picker-grid {
        grid-template-columns: repeat(auto-fill, minmax(76px, 1fr));
        gap: 6px;
        max-height: 260px;
    }
}