/*
 * quiz-formats.css — styles for the alternate question formats.
 *
 * Loaded AFTER style.css, so the accessibility fixes at the bottom land as
 * plain overrides and style.css needs no edits.
 *
 * Sizing is in `em` throughout: embed.html sets font-size: 0.9rem on
 * #questions-container, and em lets these formats scale down with it.
 */

/* ------------------------------------------------------------ shared shell */

.qf-card {
    padding: 1.25em;
}

.qf-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75em;
    margin-bottom: 0.75em;
}

.qf-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4em;
    padding: 0.35em 0.75em;
    border-radius: 999px;
    background: #eff6ff;
    color: var(--primary-color);
    font-size: 0.8em;
    font-weight: 600;
    white-space: nowrap;
}

.qf-link {
    background: none;
    border: none;
    padding: 0.35em 0.5em;
    color: var(--text-secondary);
    font-size: 0.8em;
    text-decoration: underline;
    cursor: pointer;
    border-radius: 6px;
}

.qf-link:hover {
    color: var(--primary-color);
}

.qf-qnum {
    font-size: 0.95em;
    color: var(--text-secondary);
    margin-bottom: 0.35em;
}

.qf-stem {
    font-size: 1.15em;
    line-height: 1.45;
    margin-bottom: 0.6em;
    overflow-wrap: anywhere;
}

.qf-instruction {
    display: flex;
    align-items: baseline;
    gap: 0.4em;
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-bottom: 1.1em;
}

.qf-empty {
    padding: 1em;
    color: var(--text-secondary);
    font-size: 0.9em;
}

.qf-restore {
    margin-top: 0.75em;
    text-align: center;
}

/* ------------------------------------------------------------- flip cards */

.qf-grid {
    display: grid;
    gap: 0.75em;
}

.qf-flip-grid {
    grid-template-columns: repeat(auto-fit, minmax(11em, 1fr));
}

.qf-flip {
    perspective: 800px;
}

.qf-flip-inner {
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.45s ease;
    min-height: 6em;
}

.qf-flip.is-flipped .qf-flip-inner {
    transform: rotateY(180deg);
}

.qf-face {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5em;
    width: 100%;
    min-height: 6em;
    padding: 1em 0.85em;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    background: var(--surface-color);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    text-align: center;
}

/*
 * The back face stays in flow so it drives the card's height — that is what
 * lets a long option grow the card instead of being clipped. The front is
 * absolutely positioned on top of it.
 */
.qf-face-back {
    position: relative;
    transform: rotateY(180deg);
    /* Reserves a band for the absolutely-positioned "turn back" button so it
       never lands on the option text, without narrowing the text column. */
    padding-top: 2.3em;
}

.qf-face-front {
    position: absolute;
    inset: 0;
    height: 100%;
    cursor: pointer;
}

.qf-face-front:hover {
    background: #f8fafc;
    border-color: #cbd5e1;
}

.qf-flip-hint {
    font-size: 0.78em;
    color: var(--text-secondary);
}

.qf-flip-text {
    font-size: 0.95em;
    line-height: 1.35;
    overflow-wrap: anywhere;
}

.qf-choose {
    padding: 0.45em 0.9em;
    border: 1px solid var(--primary-color);
    border-radius: 6px;
    background: var(--primary-color);
    color: #fff;
    font-size: 0.82em;
    font-weight: 500;
    cursor: pointer;
}

.qf-choose:hover {
    filter: brightness(1.08);
}

.qf-flip-back {
    position: absolute;
    top: 0.4em;
    right: 0.4em;
    width: 1.9em;
    height: 1.9em;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
}

.qf-flip-back:hover {
    background: #f1f5f9;
}

.qf-flip.is-chosen .qf-face-back {
    border-color: var(--primary-color);
    background: #eff6ff;
}

.qf-flip.is-chosen .qf-choose {
    background: var(--success-color);
    border-color: var(--success-color);
}

.qf-flip.is-key .qf-face-back {
    border-color: var(--success-color);
    background: #ecfdf5;
}

.qf-key-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.35em;
    font-size: 0.78em;
    font-weight: 600;
    color: var(--success-color);
}

/* ----------------------------------------------------------- drag and drop */

.qf-drop {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 4.5em;
    padding: 0.75em;
    margin-bottom: 1em;
    border: 2px dashed #cbd5e1;
    border-radius: 10px;
    background: #f8fafc;
    transition: background-color 0.15s, border-color 0.15s;
    cursor: pointer;
}

.qf-drop-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.4em;
    color: var(--text-secondary);
    font-size: 0.88em;
}

.qf-drop.is-hover,
.qf-drop.is-awaiting {
    border-color: var(--primary-color);
    border-style: solid;
    background: #eff6ff;
}

.qf-drop.is-awaiting {
    animation: qf-pulse 1.4s ease-in-out infinite;
}

.qf-drop.is-filled {
    border-style: solid;
    border-color: var(--success-color);
    background: #ecfdf5;
}

@keyframes qf-pulse {
    0%, 100% { border-color: var(--primary-color); }
    50% { border-color: #93c5fd; }
}

.qf-tray {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6em;
}

.qf-tray.is-locked {
    opacity: 0.55;
    pointer-events: none;
}

.qf-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.55em;
    max-width: 100%;
    padding: 0.65em 0.85em;
    border: 1px solid #e2e8f0;
    border-radius: 999px;
    background: var(--surface-color);
    color: var(--text-primary);
    font-size: 0.92em;
    text-align: left;
    cursor: grab;
    /* Required for pointer-driven dragging: without it a touch that starts on a
       chip becomes a page scroll and the browser cancels the gesture. */
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
}

.qf-chip:hover {
    border-color: #cbd5e1;
    background: #f8fafc;
}

.qf-chip.is-picked {
    border-color: var(--primary-color);
    background: #eff6ff;
    color: var(--primary-color);
    font-weight: 500;
}

.qf-chip.is-dragging {
    opacity: 0.35;
}

.qf-chip.is-placed {
    cursor: default;
    border-color: var(--success-color);
    background: var(--surface-color);
}

.qf-chip-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 1.75em;
    height: 1.75em;
    border-radius: 50%;
    border: 2px solid #cbd5e1;
    font-size: 0.8em;
    font-weight: 600;
    color: var(--text-secondary);
}

.qf-chip.is-picked .qf-chip-letter,
.qf-chip.is-placed .qf-chip-letter {
    border-color: currentColor;
}

.qf-chip-text {
    overflow-wrap: anywhere;
}

.qf-chip-x {
    flex-shrink: 0;
    width: 1.5em;
    height: 1.5em;
    margin-left: 0.15em;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.1em;
    line-height: 1;
    cursor: pointer;
}

.qf-chip-x:hover {
    background: #fee2e2;
    color: var(--danger-color);
}

/* The drag ghost. Fixed positioning means hit-testing can use raw viewport
   coordinates, with no scroll-offset maths inside the scrolling panel. */
.qf-ghost {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 2000;
    pointer-events: none;
    opacity: 0.92;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
    border-color: var(--primary-color);
}

/* ------------------------------------------------------------ true / false */

.qf-tf-statement {
    display: flex;
    flex-direction: column;
    gap: 0.4em;
    padding: 1em;
    margin-bottom: 1em;
    border: 1px solid #e2e8f0;
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
    background: #f8fafc;
}

.qf-tf-lead {
    font-size: 0.82em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-secondary);
}

.qf-tf-claim {
    font-size: 1.1em;
    line-height: 1.4;
    overflow-wrap: anywhere;
}

.qf-tf-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75em;
}

.qf-tf-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.35em;
    min-height: 4.5em;
    padding: 0.85em;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    background: var(--surface-color);
    color: var(--text-primary);
    font-size: 1em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.qf-tf-btn i {
    font-size: 1.4em;
}

.qf-tf-btn:hover {
    border-color: #cbd5e1;
    background: #f8fafc;
}

.qf-tf-btn.is-true.is-active,
.qf-tf-btn.is-true.is-key {
    border-color: var(--success-color);
    background: #ecfdf5;
    color: var(--success-color);
}

.qf-tf-btn.is-false.is-active,
.qf-tf-btn.is-false.is-key {
    border-color: var(--danger-color);
    background: #fef2f2;
    color: var(--danger-color);
}

.qf-tf-btn.is-key {
    box-shadow: inset 0 0 0 1px currentColor;
}

/* ------------------------------------------- narrow (open-book) column */

/*
 * #questions-section swaps between col-lg-6 and col-lg-12 in loadRound(). That
 * is a class, not a viewport width, so media queries cannot see it — target the
 * class directly instead.
 */
#questions-section.col-lg-6 .qf-flip-grid {
    grid-template-columns: 1fr 1fr;
}

#questions-section.col-lg-6 .qf-tray {
    flex-direction: column;
    align-items: stretch;
}

#questions-section.col-lg-6 .qf-chip {
    border-radius: 10px;
}

/* --------------------------------------------------- accessibility polish */

/* style.css defines no focus style at all; these are keyboard-only paths. */
.qf-face-front:focus-visible,
.qf-choose:focus-visible,
.qf-flip-back:focus-visible,
.qf-chip:focus-visible,
.qf-chip-x:focus-visible,
.qf-drop:focus-visible,
.qf-tf-btn:focus-visible,
.qf-link:focus-visible,
.option-label:focus-visible,
.question-number:focus-visible,
.nav-btn:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

.nav-btn:disabled {
    opacity: 0.35;
    cursor: default;
}

/* ------------------------------------------------------------- responsive */

@media (max-width: 768px) {
    .qf-card {
        padding: 1em 0.85em;
    }

    .qf-flip-grid,
    #questions-section.col-lg-6 .qf-flip-grid {
        grid-template-columns: 1fr;
    }

    .qf-tray {
        flex-direction: column;
        align-items: stretch;
    }

    .qf-chip {
        border-radius: 10px;
    }

    /* WCAG minimum touch target. */
    .qf-chip,
    .qf-choose,
    .qf-tf-btn,
    .qf-drop {
        min-height: 48px;
    }

    /* style.css:251 drops these to 36px, below the accessible minimum. */
    .question-number {
        min-width: 44px;
        width: 44px;
        height: 44px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .qf-flip-inner,
    .qf-chip,
    .qf-drop,
    .qf-tf-btn {
        transition: none !important;
    }

    .qf-drop.is-awaiting {
        animation: none;
    }
}