:root {
    --bg: #faf9f6;
    --bg-sub: #f3f1eb;
    --fg: #111111;
    --fg-sub: #555555;
    --border: #e2dfd5;
    --muted: #888888;
    
    --g-teal:   #0891b2;
    --g-pink:   #db2777;
    --error:    #ef4444;

    --font-sans: 'Space Grotesk', system-ui, sans-serif;
    --font-jp:   'Noto Sans JP', sans-serif;
    --radius:    8px;
    --radius-lg: 16px;
}

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

body {
    font-family: var(--font-jp);
    background: transparent;
    color: var(--fg);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.fm-widget {
    background: #ffffff;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: 0 12px 32px rgba(0,0,0,0.06);
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 800px;
    width: 100%;
}

.fm-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    margin-bottom: 8px;
}

.fm-controls {
    display: flex;
    gap: 4px;
}

.fm-btn {
    background: var(--bg-sub);
    color: var(--fg);
    border: 1px solid var(--border);
    min-width: 34px;
    height: 34px;
    padding: 0 9px;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

#fm-play, #fm-clear, #fm-cmaj {
    width: 34px;
    padding: 0;
}

#fm-ai-prompt {
    font-size: 0.75rem;
    letter-spacing: 0.01em;
}

.fm-btn:hover {
    background: #e5e3db;
}

.fm-btn-active {
    background: var(--g-teal) !important;
    color: #fff !important;
    border-color: var(--g-teal) !important;
}

#fm-play {
    background: var(--g-teal);
    color: #fff;
    border-color: var(--g-teal);
}

#fm-play:hover {
    background: #0780a0;
}

#fm-play:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.fm-layout {
    display: flex;
    flex-wrap: nowrap;
    gap: 12px;
    justify-content: flex-start; /* Changed from center to prevent left cutoff */
    padding-bottom: 8px;
    margin: 0 auto;
    width: max-content;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

@media (max-width: 880px) {
    .fm-layout { zoom: 0.85; gap: 8px; }
}
@media (max-width: 740px) {
    .fm-layout { zoom: 0.7; gap: 6px; }
}
@media (max-width: 600px) {
    .fm-layout { zoom: 0.55; gap: 4px; }
}
@media (max-width: 480px) {
    .fm-layout { zoom: 0.45; gap: 2px; }
}
@media (max-width: 380px) {
    .fm-layout { zoom: 0.38; gap: 2px; }
}

.fm-measure {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
}

.fm-measure-hdr {
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: none; /* Am / Ⅵm などの音楽表記をそのまま保つ */
    color: var(--muted);
    margin-bottom: 3px;
    transition: color 0.2s;
}

.fm-duration-label {
    font-family: var(--font-sans);
    font-size: 0.62rem;
    font-weight: 700;
    color: var(--g-pink);
    margin: -1px 0 3px;
    letter-spacing: 0.03em;
}

.fm-duration-label[hidden] {
    display: none;
}

.fm-measure.playing .fm-measure-hdr {
    color: var(--g-teal);
}

.fm-chord-label {
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--g-teal);
    min-height: 1.3em;
    margin-bottom: 4px;
    text-align: center;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.fm-chord-label.visible {
    opacity: 1;
}

.fm-root-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    min-height: 24px;
    margin-bottom: 4px;
    font-family: var(--font-sans);
}

.fm-root-label {
    font-size: 0.62rem;
    font-weight: 700;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.fm-root-select {
    max-width: 72px;
    padding: 2px 4px;
    border: 1px solid var(--border);
    border-radius: 5px;
    background: #fff;
    color: var(--fg-sub);
    font-family: var(--font-sans);
    font-size: 0.68rem;
    font-weight: 600;
    cursor: pointer;
}

.fm-root-select:focus {
    outline: 2px solid rgba(8,145,178,0.22);
    outline-offset: 1px;
}

.fm-root-select:disabled {
    cursor: wait;
    opacity: 0.65;
}

/* コンテンツ行: [ロール][アークSVG] */
.fm-content-row {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    width: 100%;
}

/* ── ピアノロール本体 ── */
.fm-roll {
    width: 120px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: #fff;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.04);
    transition: border-color 0.2s, box-shadow 0.2s;
    flex-shrink: 0;
}

.playing .fm-roll {
    border-color: var(--g-teal);
    box-shadow: 0 0 0 2px rgba(8,145,178,0.2);
}

.fm-roll.fm-roll-maxed {
    border-color: var(--error);
    animation: fmShake 0.4s ease;
}

@keyframes fmShake {
    0%,100% { transform: translateX(0); }
    20%,60%  { transform: translateX(-4px); }
    40%,80%  { transform: translateX(4px); }
}

/* 各鍵盤行 */
.fm-roll-row {
    display: flex;
    height: 20px;
    border-bottom: 1px solid #eceae5;
    cursor: pointer;
    user-select: none;
}

.fm-roll-row:last-child { border-bottom: none; }

.fm-roll-row.black-key {
    background: rgba(17,17,17,0.06);
}

.fm-roll-row:hover .fm-cell {
    background: rgba(8,145,178,0.12);
    border-radius: 2px;
}

.fm-roll-row.active .fm-cell {
    background: var(--g-teal);
    border-radius: 2px;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.12);
}

.fm-roll-row.active:hover .fm-cell {
    background: #0780a0;
}

.fm-roll-row.active-root .fm-cell {
    background: var(--g-pink);
    border-radius: 2px;
    box-shadow: 0 0 8px rgba(236, 72, 153, 0.6);
    opacity: 1 !important;
}

.fm-roll-row.active-root:hover .fm-cell {
    background: #d41e5e;
}

.fm-roll-row.root-specified .fm-key-lbl {
    box-shadow: inset 3px 0 0 var(--g-pink);
    color: var(--g-pink) !important;
}

/* 鍵盤ラベル */
.fm-key-lbl {
    width: 36px;
    background: var(--bg-sub);
    border-right: 1.5px solid var(--border);
    font-family: var(--font-sans);
    font-size: 9px;
    font-weight: 700;
    color: var(--muted);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    letter-spacing: -0.02em;
}

.fm-roll-row.black-key .fm-key-lbl {
    background: #ddd;
    color: #666;
}

.fm-cell {
    flex: 1;
    margin: 3px 4px;
    border-radius: 2px;
    transition: background 0.08s;
}

/* ── アークSVG ── */
.fm-arc-svg {
    flex-shrink: 0;
    display: block;
    overflow: visible;
    margin-left: -6px; /* ギリギリかぶるように寄せる */
    z-index: 10;
}

/* ── Embed Mode (Interactive Pre-filled Mode) ── */
body.embed-mode {
    padding: 0;
}

body.embed-mode .fm-widget {
    padding: 16px 12px;
    margin: 12px auto;
}

body.embed-mode .fm-header {
    margin-bottom: 12px;
}

body.embed-mode .fm-layout {
    zoom: var(--dynamic-zoom, 1) !important;
    justify-content: center;
}
/* ── Chord candidate display ── */
.fm-chord-label {
    white-space: normal;
    line-height: 1.25;
}

.fm-candidate {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--g-teal);
}