/* ============================================================================
   questions.css  —  worksheet items + gated solutions
   Sits beside editorial.css: same left-border-accent language, same
   small-caps auto-headers, same .quarto-dark dark-mode hook.

   Worksheet content is authored as Quarto MARKDOWN inside fenced divs, so
   inline math is $ … $ and paragraphs/lists render normally. Choice letters
   (A, B, C, D) are drawn by a CSS counter, so a choice is just a list item.

   Semantic color coding (information, not decoration):
     indigo  = a solution / answer region
     green   = the correct choice / accepted answer
     red     = a named misconception
   ==========================================================================*/

:root {
    --q-ink: #1f2328;
    --q-muted: #5a5a5a;
    --q-line: #e4e4e4;
    --q-card-bg: #ffffff;

    --sol-accent: #4b4f9a;
    /* indigo: "here be answers" */
    --sol-bg: #f5f5fb;
    --sol-rule: #dedcef;

    --ok-ink: #2f6249;
    /* correct / accepted (matches editorial green) */
    --ok-bg: #e7f2ec;
    --mis-ink: #a13d2e;
    /* misconception (matches editorial red) */
}

/* ---- Question card ---- */
.q {
    border: 1px solid var(--q-line);
    border-radius: 6px;
    background: var(--q-card-bg);
    padding: 1.1rem 1.3rem 1.25rem;
    margin: 1.6rem 0;
}

/* Header. Authored as [Question 1]{.q-num} [..]{.q-kind} [..]{.q-points}; */
.q-head {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    margin-bottom: 0.7rem;
    padding-bottom: 0.55rem;
    border-bottom: 1px solid var(--q-line);
}

.q-head>p {
    display: contents;
    margin: 0;
}

.q-num {
    font-weight: 700;
    letter-spacing: 0.01em;
}

.q-kind {
    font-variant: small-caps;
    letter-spacing: 0.06em;
    font-size: 0.78rem;
    color: var(--q-muted);
}

.q-points {
    margin-left: auto;
    font-size: 0.8rem;
    color: var(--q-muted);
    white-space: nowrap;
}

.q-stem {
    margin: 0 0 0.9rem;
}

.q-stem>p:first-child {
    margin-top: 0;
}

.q-stem>p:last-child {
    margin-bottom: 0;
}

/* ---- Multiple choice (a plain ordered list; letters via counter) ---- */
.q-choices>ol {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.5rem;
    counter-reset: choice;
}

.q-choices>ol>li {
    position: relative;
    padding: 0.55rem 0.7rem 0.55rem 3rem;
    /* room for the badge on the left */
    border: 1px solid var(--q-line);
    border-radius: 5px;
    counter-increment: choice;
}

.q-choices>ol>li::before {
    content: counter(choice, upper-alpha);
    /* A, B, C, D … */
    position: absolute;
    left: 0.55rem;
    top: 0.5rem;
    display: grid;
    place-items: center;
    width: 1.9rem;
    height: 1.9rem;
    border: 1px solid var(--sol-accent);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--sol-accent);
}

/* ---- Free-response writing space (prints with room to write) ----- */
.q-response {
    min-height: 6.5rem;
    border: 1px dashed var(--q-line);
    border-radius: 5px;
    background:
        repeating-linear-gradient(to bottom, transparent, transparent 1.55rem,
            var(--q-line) 1.55rem, var(--q-line) calc(1.55rem + 1px));
    background-position: 0 0.9rem;
}

.q-response::before {
    content: "Your answer";
    display: block;
    font-variant: small-caps;
    letter-spacing: 0.06em;
    font-size: 0.72rem;
    color: var(--q-muted);
    padding: 0.3rem 0.6rem 0;
}

/* ---- Solution slot (filled by solutions.js on unlock) ---- */
.qsol {
    border-left: 3px solid var(--sol-accent);
    border-radius: 0 4px 4px 0;
    background: var(--sol-bg);
    padding: 0.9rem 1.15rem;
    margin-top: 1rem;
    font-size: 0.95rem;
    line-height: 1.55;
}

.qsol::before {
    content: "Solution";
    display: block;
    font-variant: small-caps;
    letter-spacing: 0.06em;
    font-weight: 600;
    color: var(--sol-accent);
    padding-bottom: 0.35rem;
    margin-bottom: 0.6rem;
    border-bottom: 1px solid var(--sol-rule);
}

.qsol>p:first-of-type {
    margin-top: 0;
}

.qsol>*:last-child {
    margin-bottom: 0;
}

@keyframes sol-in {
    from {
        opacity: 0;
        transform: translateY(2px);
    }

    to {
        opacity: 1;
    }
}

.qsol.is-unlocked {
    animation: sol-in 180ms ease-out;
}

@media (prefers-reduced-motion: reduce) {
    .qsol.is-unlocked {
        animation: none;
    }
}

/* pieces inside a solution */
.sol-answer {
    font-size: 1.02rem;
}

.sol-model {
    border-left: 2px solid var(--ok-ink);
    background: var(--ok-bg);
    padding: 0.55rem 0.8rem;
    border-radius: 0 4px 4px 0;
    margin: 0.7rem 0;
}

.sol-model>p:first-child {
    margin-top: 0;
}

.sol-model>p:last-child {
    margin-bottom: 0;
}

.sol-explain {
    margin: 0.7rem 0;
}

.sol-feedback-title {
    font-variant: small-caps;
    letter-spacing: 0.05em;
    font-weight: 600;
    color: var(--q-muted);
    margin: 0.9rem 0 0.4rem;
}

/* per-distractor feedback: badge in col 1, BOTH text spans in col 2 ---- */
.sol-feedback {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.6rem;
}

.sol-feedback>li {
    display: grid;
    grid-template-columns: 1.9rem 1fr;
    /* badge | body */
    gap: 0.6rem;
    align-items: start;
}

.sol-feedback .opt {
    display: grid;
    place-items: center;
    width: 1.9rem;
    height: 1.9rem;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--mis-ink);
    border: 1px solid var(--mis-ink);
}

.sol-feedback .opt-body {
    /* the single col-2 cell; fills 1fr */
    display: grid;
    gap: 0.25rem;
}

.sol-feedback .opt-mis {
    color: var(--mis-ink);
    font-style: italic;
}

.sol-feedback .opt-why {
    color: var(--q-ink);
}

/* rubric table */
.sol-rubric {
    width: 100%;
    border-collapse: collapse;
    margin: 0.7rem 0;
    font-size: 0.92rem;
}

.sol-rubric caption {
    text-align: left;
    font-variant: small-caps;
    letter-spacing: 0.05em;
    font-weight: 600;
    color: var(--q-muted);
    padding-bottom: 0.35rem;
}

.sol-rubric th,
.sol-rubric td {
    border-top: 1px solid var(--sol-rule);
    padding: 0.4rem 0.55rem;
    text-align: left;
    vertical-align: top;
}

.sol-rubric th:first-child,
.sol-rubric td:first-child {
    width: 2.5rem;
    text-align: center;
    font-weight: 700;
    color: var(--ok-ink);
}

.sol-accepted {
    margin: 0.7rem 0;
}

.sol-ref {
    margin-top: 0.7rem;
    font-size: 0.85rem;
    color: var(--q-muted);
}

/* badges */
.badge {
    display: inline-block;
    font-variant: small-caps;
    letter-spacing: 0.05em;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 0.05em 0.5em;
    border-radius: 999px;
    margin-right: 0.35em;
    background: var(--sol-rule);
    color: var(--sol-accent);
}

.badge-correct {
    background: var(--ok-bg);
    color: var(--ok-ink);
}

/* ---- The password gate --- */
.solutions-gate {
    margin: 1.4rem 0;
}

.gate-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.6rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--sol-rule);
    border-left: 3px solid var(--sol-accent);
    border-radius: 0 5px 5px 0;
    background: var(--sol-bg);
}

.gate-lock {
    width: 0.8rem;
    height: 0.7rem;
    border: 2px solid var(--sol-accent);
    border-radius: 2px;
    position: relative;
    flex: none;
}

.gate-lock::before {
    content: "";
    position: absolute;
    left: 50%;
    top: -0.42rem;
    transform: translateX(-50%);
    width: 0.5rem;
    height: 0.42rem;
    border: 2px solid var(--sol-accent);
    border-bottom: none;
    border-radius: 4px 4px 0 0;
}

.gate-lock.is-open::before {
    left: 20%;
}

.gate-label {
    font-variant: small-caps;
    letter-spacing: 0.05em;
    font-weight: 600;
    color: var(--sol-accent);
}

.gate-input {
    flex: 1 1 12rem;
    min-width: 9rem;
    padding: 0.4rem 0.6rem;
    border: 1px solid var(--sol-rule);
    border-radius: 4px;
    background: var(--q-card-bg);
    color: var(--q-ink);
}

.gate-btn {
    padding: 0.42rem 1rem;
    border: 1px solid var(--sol-accent);
    border-radius: 4px;
    background: var(--sol-accent);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

.gate-btn:hover {
    filter: brightness(1.08);
}

.gate-btn:disabled {
    opacity: 0.6;
    cursor: progress;
}

.gate-btn-ghost {
    background: transparent;
    color: var(--sol-accent);
}

.gate-status {
    flex-basis: 100%;
    margin: 0;
    font-size: 0.85rem;
    color: var(--q-muted);
}

.solutions-gate.is-error .gate-input {
    border-color: var(--mis-ink);
}

.solutions-gate.is-error .gate-status {
    color: var(--mis-ink);
}

.gate-input:focus-visible,
.gate-btn:focus-visible {
    outline: 2px solid var(--sol-accent);
    outline-offset: 2px;
}

@media print {
    .solutions-gate {
        display: none;
    }

    .qsol[hidden] {
        display: none;
    }

    .q {
        break-inside: avoid;
        border-color: #bbb;
    }
}

/* ============================ Dark mode ================================= */
.quarto-dark {
    --q-ink: #dfe2e7;
    --q-muted: #a7adb6;
    --q-line: #333a44;
    --q-card-bg: #1b1f26;

    --sol-accent: #9aa0e6;
    --sol-bg: #20222e;
    --sol-rule: #343755;

    --ok-ink: #9dd3b4;
    --ok-bg: #1b241f;
    --mis-ink: #e0a498;
}

.quarto-dark .gate-btn {
    color: #14161c;
}