.tool-shell {
    max-width: 1080px;
    margin: 0 auto;
}

.page-header {
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
    padding-bottom: 18px;
    text-align: center;
}

.page-title {
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-size: 2.25rem;
    font-weight: 800;
    margin: 0;
}

.tool-panel {
    background: rgba(26, 26, 26, 0.84);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    margin-bottom: 22px;
    padding: 22px;
}

.panel-title {
    color: var(--accent-color);
    font-size: 1.25rem;
    margin: 0 0 14px 0;
}

.control-row {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: flex-end;
}

.control-field {
    display: flex;
    flex-direction: column;
    gap: 7px;
    min-width: 150px;
}

.control-field label {
    color: var(--text-dim);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
}

select,
button,
input {
    background: #333;
    border: 1px solid #444;
    border-radius: 7px;
    color: var(--text-color);
    font-size: 0.95rem;
    padding: 10px 12px;
}

button {
    cursor: pointer;
    font-weight: 800;
}

button:hover {
    border-color: var(--accent-color);
    background: #444;
}

.primary-btn {
    background: var(--secondary-color);
    color: #000;
    border-color: var(--secondary-color);
}

.mini-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
}

.info-card {
    background: rgba(0, 0, 0, 0.26);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    padding: 16px;
}

.info-card h3 {
    color: var(--secondary-color);
    margin: 0 0 8px 0;
}

.info-card p,
.muted {
    color: var(--text-dim);
    margin: 0;
}

.fretboard-lite-wrap {
    overflow-x: auto;
    padding-bottom: 8px;
}

.fretboard-lite {
    display: grid;
    grid-template-columns: 44px repeat(13, 58px);
    width: fit-content;
    min-width: 798px;
}

.fb-cell {
    align-items: center;
    background: rgba(20, 20, 20, 0.86);
    border-bottom: 1px solid #333;
    border-right: 2px solid #555;
    display: flex;
    height: 42px;
    justify-content: center;
    position: relative;
}

.fb-cell.string-label {
    color: var(--text-dim);
    font-weight: 800;
    border-right: 5px solid #777;
}

.fb-marker {
    align-items: center;
    background: var(--accent-color);
    border-radius: 50%;
    color: #000;
    display: flex;
    font-size: 0.78rem;
    font-weight: 900;
    height: 28px;
    justify-content: center;
    width: 28px;
}

.fb-marker.root {
    background: var(--highlight-color);
    color: white;
}

.fb-cell.answer {
    cursor: pointer;
}

.fb-cell.correct {
    background: rgba(3, 218, 198, 0.22);
}

.fb-cell.wrong {
    background: rgba(207, 102, 121, 0.2);
}

.routine-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.routine-card {
    background: rgba(0, 0, 0, 0.28);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    padding: 18px;
}

.routine-card.active {
    border-color: var(--secondary-color);
    box-shadow: 0 0 20px rgba(3, 218, 198, 0.12);
}

.routine-card h3 {
    color: var(--accent-color);
    margin: 0 0 8px;
}

.routine-card ol {
    color: var(--text-dim);
    padding-left: 18px;
}

.big-readout {
    color: var(--secondary-color);
    font-size: 3rem;
    font-weight: 900;
    line-height: 1;
}

.game-panel .info-card {
    min-width: 130px;
}

.drill-stage {
    display: flex;
    flex-direction: column;
    gap: 20px;
    justify-content: center;
    min-height: 240px;
}

.drill-command {
    color: var(--secondary-color);
    font-size: 2.5rem;
    line-height: 1.08;
    margin: 0;
}

.drill-detail {
    color: var(--text-color);
    font-size: 1.15rem;
}

.routine-meter {
    background: rgba(0, 0, 0, 0.32);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 999px;
    height: 14px;
    overflow: hidden;
}

.routine-meter span {
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    display: block;
    height: 100%;
    width: 0;
}

@media (max-width: 600px) {
    .main-content {
        padding-left: 16px;
        padding-right: 16px;
    }

    .page-title {
        font-size: 1.8rem;
    }

    .tool-panel {
        padding: 16px;
    }
}