/* Key Workshop — warm tactile theory explorer */

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

:root {
    --bg: #f5f0eb;
    --surface: #ffffff;
    --surface2: #f0ebe5;
    --surface3: #e8e2da;
    --border: #d9d0c5;
    --shadow-sm: 0 1px 3px rgba(80,50,20,0.06), 0 0 0 1px rgba(80,50,20,0.04);
    --shadow-md: 0 3px 12px rgba(80,50,20,0.08), 0 0 0 1px rgba(80,50,20,0.04);
    --shadow-lg: 0 8px 32px rgba(80,50,20,0.12);
    --text: #2c2418;
    --text-secondary: #7a6e5f;
    --text-muted: #a89b8a;
    --accent: #c85a1e;
    --accent-soft: rgba(200,90,30,0.1);
    --accent-warm: #e8743a;
    --major: #c85a1e;
    --major-bg: rgba(200,90,30,0.08);
    --minor: #5a7a9e;
    --minor-bg: rgba(90,122,158,0.08);
    --green: #3a7a48;
    --blue: #3a6a9e;
    --radius: 12px;
    --radius-sm: 8px;
    --header-h: 52px;
    --roman-bg: #f7f3ee;
    --roman-border: #e0d8ce;
    --pattern-accent: #b85218;
}

[data-theme="dark"] {
    --bg: #141210;
    --surface: #1e1c18;
    --surface2: #262420;
    --surface3: #302e28;
    --border: #3e3a32;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,240,220,0.04);
    --shadow-md: 0 3px 12px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,240,220,0.04);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.6);
    --text: #f0e8dc;
    --text-secondary: #a89b8a;
    --text-muted: #706858;
    --accent: #e88040;
    --accent-soft: rgba(232,128,64,0.12);
    --accent-warm: #f09050;
    --major: #e88040;
    --major-bg: rgba(232,128,64,0.1);
    --minor: #7a9ebe;
    --minor-bg: rgba(122,158,190,0.1);
    --green: #50b868;
    --blue: #5a9ed8;
    --roman-bg: #242218;
    --roman-border: #3a362c;
    --pattern-accent: #e88040;
}

html, body {
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    display: flex;
    flex-direction: column;
    height: 100dvh;
    overflow: hidden;
}

/* ── Header ─────────────────────────────────────────── */
.kw-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-h);
    background: var(--bg);
    display: flex;
    align-items: center;
    padding: 0 12px;
    z-index: 100;
    border-bottom: 1px solid var(--border);
    gap: 8px;
}

.kw-header-back {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 22px;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    line-height: 1;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
}
.kw-header-back:active { opacity: 0.6; }

.kw-header-title {
    flex: 1;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.kw-header-right { display: flex; align-items: center; gap: 8px; }

.kw-theme-toggle {
    width: 36px; height: 36px;
    border: none; background: none;
    border-radius: 8px;
    font-size: 18px;
    display: flex; align-items: center; justify-content: center;
    -webkit-tap-highlight-color: transparent;
}
.kw-theme-toggle::before { content: ''; }
[data-theme="light"] .kw-theme-toggle::before { content: '🌙'; }
[data-theme="dark"] .kw-theme-toggle::before { content: '☀️'; }

/* ── Main ─────────────────────────────────────────── */
.kw-main {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding-top: var(--header-h);
}

.kw-view { padding: 16px; }
.kw-view.hidden { display: none; }
.hidden { display: none !important; }

/* ── Key Selector ─────────────────────────────────── */
.kw-selector-intro {
    text-align: center;
    padding: 20px 0 24px;
}

.kw-selector-title {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 6px;
}

.kw-selector-sub {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.kw-key-section {
    margin-bottom: 28px;
}

.kw-key-section-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 10px;
    padding-left: 4px;
}

.kw-key-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.kw-key-btn {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 14px 4px 12px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: transform .1s ease, box-shadow .1s ease, border-color .15s;
    text-decoration: none;
    color: var(--text);
    font-family: inherit;
}

.kw-key-btn:active { transform: scale(0.95); }
.kw-key-btn:hover { border-color: var(--accent); box-shadow: var(--shadow-md); }

.kw-key-btn.is-major { border-left: 3px solid var(--major); }
.kw-key-btn.is-minor { border-left: 3px solid var(--minor); }

.kw-key-btn.kw-key-hot { background: var(--major-bg); }
.kw-key-btn.kw-key-hot.is-minor { background: var(--minor-bg); }

.kw-key-name {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1;
}

.kw-key-count {
    font-size: 0.72rem;
    color: var(--text-secondary);
    margin-top: 4px;
    font-weight: 500;
}

.kw-key-empty .kw-key-name { color: var(--text-muted); }
.kw-key-empty .kw-key-count { color: var(--text-muted); }
.kw-key-empty { opacity: 0.5; pointer-events: none; }

/* Entry animation */
.kw-key-btn { opacity: 0; animation: kwKeyIn .3s ease forwards; }
@keyframes kwKeyIn {
    from { opacity: 0; transform: translateY(8px) scale(0.96); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ── Dashboard ────────────────────────────────────── */
.kw-dash-header {
    padding: 12px 0 20px;
}

.kw-dash-key-name {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.kw-dash-key-name .kw-dash-quality {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.65em;
    margin-left: 4px;
}

.kw-dash-song-count {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Diatonic chord strip */
.kw-diatonic-strip {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    padding: 12px 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.kw-diatonic-strip::-webkit-scrollbar { display: none; }

.kw-diatonic-chip {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 12px 7px;
    background: var(--roman-bg);
    border: 1px solid var(--roman-border);
    border-radius: var(--radius-sm);
    min-width: 48px;
}

.kw-diatonic-roman {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.02em;
}

.kw-diatonic-chord {
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 2px;
}

/* ── Section cards (pattern insights, song list) ──── */
.kw-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 14px;
    overflow: hidden;
}

.kw-card-header {
    padding: 14px 16px 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border);
}

.kw-card-icon {
    width: 28px; height: 28px;
    border-radius: 7px;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.kw-card-icon.patterns { background: var(--accent-soft); color: var(--accent); }
.kw-card-icon.songs { background: var(--minor-bg); color: var(--minor); }
.kw-card-icon.chords { background: rgba(58,122,72,0.1); color: var(--green); }

.kw-card-title {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.kw-card-body { padding: 12px 16px 14px; }

/* ── Progression-centric layout ──────────────────── */

.kw-prog-card {
    margin-bottom: 12px;
}

.kw-prog-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
}

.kw-prog-play-btn {
    width: 36px; height: 36px;
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    border: none;
    border-radius: 50%;
    background: var(--accent-soft);
    color: var(--accent);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: background .12s, transform .1s;
}
.kw-prog-play-btn:active { transform: scale(0.9); }
.kw-prog-play-btn .kw-stop-icon { display: none; }
.kw-prog-play-btn.is-playing .kw-play-icon { display: none; }
.kw-prog-play-btn.is-playing .kw-stop-icon { display: block; }
.kw-prog-play-btn.is-playing {
    background: var(--accent);
    color: white;
}

.kw-prog-info {
    flex: 1;
    min-width: 0;
}

.kw-prog-name {
    font-size: 0.82rem;
    font-weight: 700;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    color: var(--pattern-accent);
    letter-spacing: 0.03em;
    margin-bottom: 6px;
}

.kw-prog-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.kw-prog-song-count {
    flex-shrink: 0;
    font-size: 0.72rem;
    color: var(--text-muted);
    background: var(--surface2);
    padding: 2px 8px;
    border-radius: 20px;
    white-space: nowrap;
}

/* Song rows under each progression */
.kw-prog-songs { }

.kw-prog-song-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--surface2);
    transition: background .1s;
}
.kw-prog-song-row:last-child { border-bottom: none; }
.kw-prog-song-row:active { background: var(--surface2); }

.kw-prog-song-art {
    width: 32px; height: 32px;
    border-radius: 5px;
    background: var(--surface3);
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted);
    overflow: hidden;
}
.kw-prog-song-art img {
    width: 100%; height: 100%;
    object-fit: cover;
}

.kw-prog-song-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.kw-prog-song-name {
    font-size: 0.82rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kw-prog-song-artist {
    font-size: 0.72rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kw-prog-song-section {
    flex-shrink: 0;
    font-size: 0.68rem;
    color: var(--text-muted);
    text-transform: capitalize;
    background: var(--surface2);
    padding: 2px 7px;
    border-radius: 4px;
}

.kw-prog-song-row {
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.kw-tab-pill {
    flex-shrink: 0;
    font-size: 0.6rem;
    font-weight: 500;
    color: var(--text-muted);
    background: var(--surface1);
    border: 1px solid var(--border);
    padding: 1px 5px;
    border-radius: 3px;
    white-space: nowrap;
}
.kw-tab-pill-tab {
    color: var(--accent, #d4622a);
    border-color: color-mix(in srgb, var(--accent, #d4622a) 30%, transparent);
}

.kw-prog-song-arrow {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform .15s;
}
.kw-prog-song-row:active .kw-prog-song-arrow { transform: translateX(2px); }

.kw-section-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    flex: 1;
}

.kw-roman-pill {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    background: var(--roman-bg);
    border: 1px solid var(--roman-border);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.kw-roman-pill .kw-pill-chord {
    font-family: inherit;
    font-weight: 500;
    color: var(--text-secondary);
    margin-left: 4px;
    font-size: 0.68rem;
}

.kw-repeat-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 7px;
    background: var(--accent-soft);
    color: var(--accent);
    border-radius: 6px;
    font-size: 0.72rem;
    font-weight: 700;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.kw-section-prog-name {
    font-size: 0.68rem;
    color: var(--accent);
    font-weight: 600;
    margin-top: 2px;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}


/* Loading state */
.kw-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.kw-spinner {
    width: 20px; height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: kwSpin .7s linear infinite;
    margin-right: 10px;
}

@keyframes kwSpin {
    to { transform: rotate(360deg); }
}

/* Empty state */
.kw-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.kw-empty-icon { font-size: 2.5rem; margin-bottom: 12px; }
.kw-empty-text { font-size: 0.9rem; line-height: 1.5; }

/* Dashboard entry animation */
.kw-card {
    opacity: 0;
    animation: kwCardIn .35s ease forwards;
}
@keyframes kwCardIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Dashboard header with practice button ──────── */
.kw-dash-header-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.kw-practice-btn {
    flex-shrink: 0;
    padding: 8px 18px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: background .12s, transform .1s;
}
.kw-practice-btn:active { transform: scale(0.95); }
.kw-practice-btn:hover { background: var(--accent-warm); }

/* ══ Practice Mode ════════════════════════════════ */

.kw-prac-toggle {
    display: flex;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 20px;
}

.kw-prac-toggle-btn {
    flex: 1;
    padding: 10px 0;
    background: transparent;
    border: none;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background .12s, color .12s;
    -webkit-tap-highlight-color: transparent;
}
.kw-prac-toggle-btn.active {
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--shadow-sm);
}

.kw-prac-area.hidden { display: none; }

/* ── Chord Recall ─────────────────────────────── */

.kw-prac-chord-display {
    text-align: center;
    padding: 40px 0 20px;
}

.kw-prac-chord-number {
    font-size: 4.5rem;
    font-weight: 900;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    color: var(--accent);
    line-height: 1;
    letter-spacing: -0.03em;
    animation: kwPracFadeIn .25s ease;
}

.kw-prac-chord-name {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text);
    margin-top: 12px;
    min-height: 2.2rem;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity .35s ease, transform .35s ease;
}
.kw-prac-chord-name.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes kwPracFadeIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.kw-prac-chord-diagram {
    display: flex;
    justify-content: center;
    min-height: 20px;
    margin-bottom: 16px;
}
.kw-prac-chord-diagram svg {
    display: block;
}

/* Chord recall nav */
.kw-prac-nav {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
    padding: 0 0 20px;
}

.kw-prac-btn-nav,
.kw-prac-btn-pause,
.kw-prac-btn-reveal {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: background .12s, border-color .12s;
}
.kw-prac-btn-nav:hover,
.kw-prac-btn-pause:hover,
.kw-prac-btn-reveal:hover {
    background: var(--surface2);
}
.kw-prac-btn-nav:disabled { opacity: 0.35; cursor: default; }
.kw-prac-btn-pause.active {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}
.kw-prac-btn-reveal {
    background: var(--accent-soft);
    border-color: rgba(200,90,30,0.25);
    color: var(--accent);
}

/* Reference panel */
.kw-prac-ref {
    border-top: 1px solid var(--border);
    padding-top: 16px;
}

.kw-prac-ref-label {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.kw-prac-ref-grid {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.kw-prac-ref-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 6px 10px 5px;
    background: var(--roman-bg);
    border: 1px solid var(--roman-border);
    border-radius: var(--radius-sm);
    min-width: 42px;
}

.kw-prac-ref-roman {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--accent);
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

.kw-prac-ref-chord {
    font-size: 0.78rem;
    font-weight: 600;
    margin-top: 1px;
}

/* ── Progressions mode ────────────────────────── */

.kw-prac-prog-status {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.kw-prac-tempo-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.kw-prac-tempo-slider {
    flex: 1;
    max-width: 200px;
    accent-color: var(--accent);
}

.kw-prac-barbeat {
    font-size: 0.82rem;
    font-weight: 600;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    color: var(--text);
    min-height: 1.2em;
    margin-bottom: 12px;
}

/* Progression chord pills */
.kw-prac-prog-chords {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.kw-prac-prog-chord {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px 14px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    min-width: 56px;
    transition: border-color .15s, background .15s, box-shadow .15s;
}
.kw-prac-prog-chord.active {
    border-color: var(--accent);
    background: var(--accent-soft);
    box-shadow: 0 0 0 2px var(--accent-soft);
}
.kw-prac-prog-chord.completed {
    opacity: 0.5;
}

.kw-prac-prog-roman {
    font-size: 0.78rem;
    font-weight: 700;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    color: var(--accent);
}

.kw-prac-prog-name {
    font-size: 0.82rem;
    font-weight: 600;
    margin-top: 2px;
    opacity: 0;
    transition: opacity .2s;
}

.kw-prac-chords-revealed .kw-prac-prog-name {
    opacity: 1;
}

/* Transport controls */
.kw-prac-prog-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.kw-prac-ctrl-btn {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: background .12s, border-color .12s;
}
.kw-prac-ctrl-btn:hover { background: var(--surface2); }
.kw-prac-ctrl-btn:disabled { opacity: 0.35; cursor: default; }
.kw-prac-ctrl-btn.active {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
}

.kw-prac-ctrl-play {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
.kw-prac-ctrl-play:hover { background: var(--accent-warm); }
.kw-prac-ctrl-play:disabled { background: var(--surface3); border-color: var(--border); color: var(--text-muted); }

.kw-prac-ctrl-reveal {
    background: var(--accent-soft);
    border-color: rgba(200,90,30,0.25);
    color: var(--accent);
}
.kw-prac-ctrl-reveal.active {
    background: var(--accent);
    color: #fff;
}

/* ── Responsive ───────────────────────────────────── */
@media (min-width: 480px) {
    .kw-key-grid { grid-template-columns: repeat(6, 1fr); }
    .kw-view { max-width: 600px; margin: 0 auto; }
}

@media (min-width: 768px) {
    .kw-key-grid { grid-template-columns: repeat(7, 1fr); }
    .kw-view { max-width: 720px; }
}