/* Fretboard Trainer */
.trainer-page {
    max-width: 1120px;
}

.trainer-heading {
    max-width: 760px;
    margin-bottom: 30px;
}

.trainer-heading .home-eyebrow {
    margin-bottom: 10px;
}

.trainer-heading h1 {
    margin-bottom: 6px;
}

.trainer-lead {
    max-width: 720px;
    margin: 14px 0 0;
    color: var(--copy-text);
    font-size: 17px;
    font-weight: 500;
    line-height: 1.75;
}

.trainer-workspace {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 18px;
}

.trainer-card {
    color: var(--text);
    background: var(--panel-background);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    box-shadow: 0 12px 28px var(--shadow-color);
}

.trainer-card::before {
    display: none;
}

.trainer-card:hover {
    box-shadow: 0 12px 28px var(--shadow-color);
}

.trainer-question-card,
.trainer-answer-card,
.trainer-reference {
    padding: 22px;
}

.trainer-question-card {
    border-left: 4px solid var(--teal);
}

.trainer-reference {
    grid-column: 1 / -1;
}

.trainer-question-topline,
.trainer-answer-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.trainer-kicker {
    margin: 0;
    color: var(--teal);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.trainer-question-topline span,
.trainer-score {
    color: var(--copy-text);
    font-weight: 700;
}

.trainer-question-card h2,
.trainer-answer-card h2,
.trainer-reference h2 {
    margin: 0;
    color: var(--gold-light);
    font-size: 24px;
}

.trainer-question-display {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin: 22px 0;
}

.trainer-question-display div {
    padding: 20px;
    background: var(--control-background);
    border: 1px solid var(--border-soft);
    border-radius: 8px;
}

.trainer-question-display span,
.trainer-question-display small {
    display: block;
    color: var(--copy-text);
    font-weight: 600;
}

.trainer-question-display strong {
    display: block;
    margin: 6px 0;
    color: var(--text);
    font-family: "Noto Serif TC", serif;
    font-size: 56px;
    line-height: 1;
}

.trainer-feedback {
    min-height: 58px;
    padding: 14px 16px;
    color: var(--copy-text);
    background: rgba(127, 183, 173, 0.08);
    border: 1px solid rgba(127, 183, 173, 0.28);
    border-radius: 8px;
    font-weight: 600;
    line-height: 1.55;
}

.trainer-feedback.is-correct {
    color: var(--teal);
    background: rgba(127, 183, 173, 0.14);
    border-color: rgba(127, 183, 173, 0.44);
}

.trainer-feedback.is-wrong {
    color: #e2c1c4;
    background: rgba(167, 111, 115, 0.1);
    border-color: rgba(167, 111, 115, 0.42);
}

html[data-theme="light"] .trainer-feedback.is-wrong {
    color: #7d3f45;
    background: rgba(125, 63, 69, 0.08);
}

.trainer-feedback.is-revealed {
    color: var(--gold-light);
}

.trainer-score {
    display: inline-flex;
    align-items: baseline;
    gap: 5px;
    padding: 9px 12px;
    background: var(--control-background);
    border: 1px solid var(--border-soft);
    border-radius: 999px;
}

.trainer-score strong {
    color: var(--gold-light);
    font-size: 18px;
}

.note-answer-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
}

.note-answer-grid button {
    min-height: 48px;
    padding: 10px;
    color: var(--text-body);
    background: var(--control-background);
    border: 1px solid var(--border-soft);
    border-radius: 7px;
    font: inherit;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.note-answer-grid button:hover:not(:disabled) {
    color: var(--secondary-hover-text);
    background: var(--secondary-hover-background);
    border-color: var(--hover-border);
    transform: translateY(-1px);
}

.note-answer-grid button.is-correct {
    color: var(--chord-accent-text);
    background: var(--chord-accent);
    border-color: var(--chord-accent);
}

.note-answer-grid button.is-wrong {
    color: #fff6f7;
    background: #8b4a50;
    border-color: #8b4a50;
}

html[data-theme="light"] .note-answer-grid button.is-wrong {
    color: #fffaf4;
    background: #7d3f45;
    border-color: #7d3f45;
}

.note-answer-grid button:disabled {
    cursor: default;
}

.trainer-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.trainer-actions .primary-button,
.trainer-actions .secondary-button {
    min-height: 42px;
    padding: 9px 14px;
    border-radius: 999px;
}

.string-reference-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 8px;
    margin: 16px 0;
}

.string-reference-grid span {
    padding: 12px;
    color: var(--text-body);
    background: var(--control-background);
    border: 1px solid var(--border-soft);
    border-radius: 7px;
    font-weight: 700;
}

.string-reference-grid strong {
    display: block;
    color: var(--teal);
    font-size: 18px;
}

.trainer-reference p:last-child {
    margin-bottom: 0;
    color: var(--copy-text);
    font-weight: 500;
    line-height: 1.65;
}

@media (max-width: 900px) {
    .trainer-workspace {
        grid-template-columns: 1fr;
    }

    .string-reference-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .trainer-question-display,
    .note-answer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .trainer-question-topline,
    .trainer-answer-heading,
    .trainer-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .string-reference-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}