body.is-quiz {
    height: auto;
    min-height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
}

.quiz-shell {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
    width: min(1080px, 100%);
    margin: 0 auto;
    padding: 0.4rem 1.25rem 4rem;
    flex: 1;
}

.quiz-rail {
    position: sticky;
    top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    padding: 1rem 0.9rem 1.05rem;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: var(--panel);
    backdrop-filter: blur(16px);
}

.quiz-rail-label {
    margin: 0 0 0.35rem;
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
}

.quiz-tabs {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.quiz-tab {
    width: 100%;
    text-align: left;
    border: 1px solid var(--line);
    background: transparent;
    color: var(--ink);
    border-radius: 14px;
    padding: 0.62rem 0.75rem;
    cursor: pointer;
    font: inherit;
    font-size: 0.88rem;
    line-height: 1.3;
}

.quiz-tab small {
    display: block;
    margin-top: 0.15rem;
    color: var(--muted);
    font-size: 0.72rem;
}

.quiz-tab.is-on {
    background: var(--accent);
    color: var(--accent-ink);
    border-color: transparent;
    font-weight: 600;
}

.quiz-tab.is-on small {
    color: rgba(20, 22, 12, 0.65);
}

.quiz-create {
    margin-top: 0.45rem;
    padding-top: 0.85rem;
    border-top: 1px solid var(--line);
}

.quiz-create .field {
    margin-bottom: 0.55rem;
}

.quiz-create .field .label {
    display: block;
    margin-bottom: 0.35rem;
}

.quiz-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.quiz-chips .chip {
    font-size: 0.78rem;
    padding: 0.38rem 0.55rem;
}

.quiz-create .label {
    text-align: left;
}

.quiz-create input {
    width: 100%;
    margin-bottom: 0.55rem;
    border: 1px solid var(--line);
    background: transparent;
    color: var(--ink);
    border-radius: 12px;
    padding: 0.7rem 0.8rem;
    font: inherit;
    outline: none;
}

.quiz-create input:focus {
    border-color: rgba(231, 255, 106, 0.45);
}

.quiz-create .cta {
    margin-top: 0;
    font-size: 0.92rem;
    padding: 0.8rem 0.9rem;
}

.quiz-create-err {
    margin: 0.55rem 0 0;
    color: var(--reject);
    font-size: 0.82rem;
    line-height: 1.4;
}

body.is-quiz .setup {
    flex: none;
    padding: 0.35rem 0 1.5rem;
    align-items: flex-start;
}

body.is-quiz .end {
    padding: 0.35rem 0 1.5rem;
}

.quiz-play {
    width: min(640px, 100%);
}

.quiz-progress {
    margin: 0 0 0.85rem;
    color: var(--muted);
    font-size: 0.82rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.quiz-topic {
    margin: 0 0 0.7rem;
    color: var(--accent);
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.quiz-q {
    font-family: Fraunces, Georgia, serif;
    font-weight: 650;
    font-size: clamp(1.35rem, 3vw, 1.7rem);
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin: 0 0 1rem;
    text-align: left;
}

.quiz-code {
    display: block;
    margin: 0 0 1rem;
    padding: 0.85rem 1rem;
    border-radius: 14px;
    background: rgba(0, 0, 0, 0.28);
    border: 1px solid var(--line);
    color: var(--ink);
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.82rem;
    line-height: 1.45;
    text-align: left;
    overflow-x: auto;
    white-space: pre;
}

.quiz-opts {
    display: grid;
    gap: 0.5rem;
}

.quiz-opt {
    width: 100%;
    text-align: left;
    border: 1px solid var(--line);
    background: transparent;
    color: var(--ink);
    border-radius: 16px;
    padding: 0.85rem 1rem;
    cursor: pointer;
    font: inherit;
    font-size: 0.95rem;
    line-height: 1.4;
}

.quiz-opt:hover:not(:disabled) {
    border-color: rgba(231, 255, 106, 0.35);
}

.quiz-opt.is-on {
    background: var(--accent);
    color: var(--accent-ink);
    border-color: transparent;
    font-weight: 600;
}

.quiz-opt.is-bad {
    border-color: rgba(255, 180, 168, 0.55);
    color: var(--reject);
}

.quiz-opt:disabled {
    cursor: default;
}

.quiz-why {
    margin: 1rem 0 0;
    text-align: left;
    color: var(--muted);
    line-height: 1.55;
    font-size: 0.95rem;
}

.quiz-miss {
    margin: 1.1rem 0 0.2rem;
    text-align: left;
}

.quiz-miss h3 {
    margin: 0 0 0.65rem;
    font-size: 0.75rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
    font-weight: 600;
}

.quiz-miss article {
    border-top: 1px solid var(--line);
    padding: 0.75rem 0;
}

.quiz-miss p {
    margin: 0.25rem 0 0;
    color: var(--muted);
    line-height: 1.5;
    font-size: 0.9rem;
}

.quiz-miss .miss-q {
    color: var(--ink);
    font-weight: 500;
}

a.quiz-sheet {
    display: block;
    text-decoration: none;
    text-align: center;
    margin-top: 0.55rem;
    line-height: 1.2;
    padding-top: 0.95rem;
    padding-bottom: 0.95rem;
}

.quiz-score {
    margin: 0.35rem 0 0;
    color: var(--muted);
    font-size: 0.92rem;
}

.quiz-score.is-wait {
    color: var(--accent);
}

.quiz-explain {
    margin-top: 0.75rem;
    text-align: left;
}

.quiz-explain-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}

.quiz-explain-actions .cta {
    margin-top: 0;
    font-size: 0.88rem;
    padding: 0.65rem 0.85rem;
}

.quiz-explain-actions .cta:disabled {
    opacity: 0.55;
    cursor: wait;
}

.quiz-explain-detail {
    margin: 0.75rem 0 0;
    padding: 0.85rem 0.95rem;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.02);
    color: var(--ink);
    line-height: 1.55;
    font-size: 0.92rem;
}

.end-card .cta + .cta,
.end-card .cta + a.cta,
.end-card #btn-debrief + .quiz-miss {
    margin-top: 0.55rem;
}

@media (max-width: 860px) {
    .quiz-shell {
        grid-template-columns: 1fr;
        padding-top: 0.2rem;
    }

    .quiz-rail {
        position: static;
    }

    .quiz-tabs {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .quiz-tab {
        width: auto;
        flex: 1 1 auto;
    }
}