/* ============================================================
   Quizzy — Test Cafe
   Builds on the palette in style.css and adds the status colours
   the exam UI needs (answered / not answered / marked / correct).
   ============================================================ */

/* The --st-* status colours now live in style.css so the Question Cafe can use
   the exact same correct/incorrect palette. Only the exam chrome sizes are
   local to this file. */
:root {
    --tr-top-h: 60px;
    --tr-foot-h: 66px;
}

/* ===== SCREENS ===== */
.tc-screen { display: none; }
.tc-screen.active { display: block; }

.tc-wrap {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1.25rem 3rem;
}

/* The runner takes over the viewport — the site navbar would only get in the
   way of a timed test. Every runner mode has its own way back in the top bar. */
body.tc-running .navbar { display: none; }
body.tc-running { overflow-x: hidden; }

.tc-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 5rem 1rem;
    color: var(--text-muted);
}
.tc-spinner {
    width: 38px;
    height: 38px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: tcspin 0.8s linear infinite;
}
@keyframes tcspin { to { transform: rotate(360deg); } }

.tc-note {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    margin: 1rem 0;
    font-size: 0.88rem;
    color: var(--text-secondary);
}
.tc-note.error { border-left-color: var(--error); }
.tc-note strong { color: var(--text-primary); display: block; margin-bottom: 0.25rem; }
.tc-note p { margin: 0; color: var(--text-muted); }
.tc-note code {
    font-family: 'Consolas', monospace;
    background: var(--bg-secondary);
    padding: 0.1rem 0.35rem;
    border-radius: 4px;
}

.tc-back-link {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.5rem 0;
}
.tc-back-link:hover { color: var(--accent); }

.tc-big-btn {
    padding: 0.9rem 1.75rem;
    font-size: 0.95rem;
    font-weight: 700;
}

/* ===== HOME ===== */
.tc-hero {
    text-align: center;
    padding: 2.75rem 0 1.5rem;
}
.tc-hero h1 {
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    margin-bottom: 0.4rem;
}
.tc-hero p {
    color: var(--text-muted);
    font-size: 0.92rem;
    max-width: 460px;
    margin: 0 auto 1.5rem;
}
.tc-hero-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

.tc-crumbs {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    padding: 0.5rem 0 1rem;
}
.tc-crumb-back,
.tc-crumb {
    background: none;
    border: none;
    font-family: inherit;
    font-size: 0.85rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem 0;
    font-weight: 600;
}
.tc-crumb-back {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.4rem 0.8rem;
}
.tc-crumb-back:hover, .tc-crumb:hover { color: var(--accent); }
.tc-crumb.active { color: var(--text-primary); }
.tc-crumb-path { display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap; }
.tc-crumb-sep { color: var(--text-subtle); font-size: 0.8rem; }

.tc-row {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.9rem;
    padding: 1rem 1.15rem;
    margin-bottom: 0.6rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    text-align: left;
    font-family: inherit;
    transition: all var(--transition-fast);
}
.tc-row:hover {
    border-color: var(--accent);
    transform: translateX(3px);
}
.tc-row-icon { font-size: 1.4rem; flex-shrink: 0; }
.tc-row-body { flex: 1; min-width: 0; }
.tc-row-name {
    display: block;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
}
.tc-row-meta {
    display: block;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}
.tc-row-go { color: var(--text-subtle); font-size: 1.2rem; }

/* ===== RESUME BANNER (unfinished attempt) ===== */
.tc-resume {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    padding: 1rem 1.25rem;
    margin-bottom: 1.25rem;
    background: var(--warning-bg);
    border: 1px solid var(--warning);
    border-radius: var(--radius-md);
}
.tc-resume.inline { margin: 1.5rem 0 0; }
.tc-resume-title {
    font-size: 0.92rem;
    font-weight: 800;
    color: var(--text-primary);
}
.tc-resume-meta {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}
.tc-resume-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* ===== ATTEMPT ROWS (test detail + history) ===== */
.att-list { display: flex; flex-direction: column; gap: 0.5rem; }
.att-row {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    padding: 0.85rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    flex-wrap: wrap;
}
.att-row:hover { border-color: var(--accent); }
.att-badge {
    width: 42px;
    height: 42px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--accent-glow);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 800;
}
.att-body { flex: 1 1 160px; min-width: 0; }
.att-score {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}
.att-score span { font-size: 0.8rem; font-weight: 600; color: var(--text-muted); }
.att-pct {
    display: inline-block;
    margin-left: 0.4rem;
    font-size: 0.72rem;
    font-weight: 800;
    border-radius: 50px;
    padding: 0.1rem 0.55rem;
    vertical-align: middle;
}
.att-pct.good { color: var(--st-green); background: var(--st-green-bg); }
.att-pct.mid { color: var(--warning); background: var(--warning-bg); }
.att-pct.low { color: var(--st-red); background: var(--st-red-bg); }
.att-meta { font-size: 0.78rem; color: var(--text-secondary); margin-top: 0.15rem; }
.att-date { font-size: 0.72rem; color: var(--text-muted); margin-top: 0.1rem; }
.att-actions { display: flex; align-items: center; gap: 0.4rem; flex-shrink: 0; }

/* ===== HISTORY GROUPS ===== */
.hist-group {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.1rem 1.25rem 1.25rem;
    margin-bottom: 1rem;
}
.hist-group-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
    padding-bottom: 0.5rem;
}
.hist-group-name { font-size: 1rem; font-weight: 800; color: var(--text-primary); }
.hist-group-meta { font-size: 0.78rem; color: var(--text-muted); margin-top: 0.2rem; }
.hist-group .tc-detail-sub { margin-top: 0.75rem !important; }

/* ===== TEST DETAIL ===== */
.tc-detail-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    margin-top: 0.5rem;
}
.tc-detail-card h1 {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}
.tc-detail-desc {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-top: 0.5rem;
}
.tc-detail-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.6rem;
    margin: 1.5rem 0 0.85rem;
}
.tc-detail-stats > div {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 0.9rem 0.5rem;
    text-align: center;
}
.tc-detail-stats .v {
    display: block;
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--accent);
}
.tc-detail-stats .l {
    display: block;
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-top: 0.15rem;
}
/* ===== DURATION PICKER ===== */
.tc-duration-picker {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0.85rem 1rem;
    margin-bottom: 1.5rem;
}
.tc-duration-picker label {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}
.tc-duration-controls {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-left: auto;
}
.tc-dur-step {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 800;
    line-height: 1;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.tc-dur-step:hover { border-color: var(--accent); color: var(--accent); }
#tcDurationInput {
    width: 68px;
    padding: 0.4rem 0.5rem;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 800;
    text-align: center;
    color: var(--accent);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-variant-numeric: tabular-nums;
}
#tcDurationInput:focus { outline: none; border-color: var(--accent); }
.tc-dur-unit {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
}
.tc-dur-reset {
    display: none;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
    text-decoration: underline;
    padding: 0;
}
.tc-dur-reset.show { display: inline-block; }
.tc-dur-reset:hover { color: var(--accent); }

.tc-detail-sub {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    margin-bottom: 0.6rem;
}
.tc-detail-sections { display: flex; flex-direction: column; gap: 0.45rem; }
.tc-detail-section {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.7rem 0.9rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}
.tc-detail-section .s-name {
    flex: 1;
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.9rem;
}
.tc-detail-section .s-meta { font-size: 0.78rem; color: var(--text-muted); }
.tc-detail-actions { margin-top: 1.75rem; }
.tc-detail-actions .tc-big-btn { width: 100%; }
.tc-detail-hint {
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.75rem;
}

/* ===== CUSTOM BUILDER ===== */
.ct-test {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 0.85rem;
    overflow: hidden;
}
.ct-test-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.1rem;
    background: var(--bg-secondary);
    flex-wrap: wrap;
}
.ct-test-name { font-weight: 700; color: var(--text-primary); font-size: 0.92rem; }
.ct-test-meta { font-size: 0.76rem; color: var(--text-muted); }
.ct-section-list { padding: 0.6rem 0.75rem 0.85rem; }
.ct-section {
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.8rem;
    margin-bottom: 0.4rem;
    transition: all var(--transition-fast);
}
.ct-section.on {
    border-color: var(--accent);
    background: var(--accent-glow);
}
.ct-section-main {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    cursor: pointer;
}
.ct-section-main input[type="checkbox"] {
    width: 17px;
    height: 17px;
    accent-color: var(--accent);
    cursor: pointer;
    flex-shrink: 0;
}
.ct-section-name { flex: 1; font-weight: 600; color: var(--text-primary); font-size: 0.88rem; }
.ct-section-count { font-size: 0.75rem; color: var(--text-muted); }
.ct-section-cfg {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.6rem;
    padding-top: 0.6rem;
    border-top: 1px dashed var(--border);
    font-size: 0.78rem;
    color: var(--text-muted);
}
.ct-section-cfg input {
    width: 72px;
    padding: 0.35rem 0.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: inherit;
    text-align: center;
    font-weight: 700;
}

.ct-config {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1.1rem 1.25rem;
    margin-top: 1rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-end;
}
.ct-field { display: flex; flex-direction: column; gap: 0.35rem; flex: 1 1 180px; }
.ct-field label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    color: var(--text-muted);
    font-weight: 700;
}
.ct-field input[type="text"],
.ct-field input[type="number"] {
    padding: 0.6rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
}
.ct-field input:focus { border-color: var(--accent); }
.ct-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    flex: 1 1 160px;
}
.ct-check input { width: 17px; height: 17px; accent-color: var(--accent); cursor: pointer; }

.ct-summary {
    text-align: center;
    padding: 0.85rem;
    margin-top: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.88rem;
}
.ct-summary strong { color: var(--accent); }
.ct-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}
.ct-actions .btn { flex: 1 1 auto; }

/* Floating Sticky Action Bar */
.ct-floating-bar {
    position: fixed;
    bottom: 1.25rem;
    left: 50%;
    transform: translateX(-50%);
    width: min(900px, 94vw);
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 0.85rem 1.5rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4), 0 0 20px var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    z-index: 100;
    backdrop-filter: blur(16px);
}
.ct-float-info {
    display: flex;
    flex-direction: column;
}
.ct-float-count {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-primary);
}
.ct-float-sub {
    font-size: 0.78rem;
    color: var(--text-muted);
}
.ct-float-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
@media (max-width: 600px) {
    .ct-floating-bar {
        width: 96vw;
        padding: 0.75rem 1rem calc(0.75rem + env(safe-area-inset-bottom));
        bottom: 0.75rem;
        gap: 0.5rem;
        flex-wrap: wrap;
    }
    .ct-float-info {
        flex: 1 1 100%;
        text-align: center;
    }
    .ct-float-actions {
        width: 100%;
        justify-content: center;
    }
    .ct-float-actions .btn {
        flex: 1;
        font-size: 0.85rem;
        padding: 0.6rem 0.75rem;
    }
}

/* Custom Test Selected Drawer & Modal */
.ct-drawer-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.ct-drawer-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.ct-selected-drawer {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translate(-50%, 100%);
    width: min(760px, 96vw);
    max-height: 82vh;
    background: var(--bg-card);
    border: 1.5px solid var(--border);
    border-bottom: none;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    box-shadow: 0 -10px 40px rgba(0,0,0,0.5), 0 0 25px var(--accent-glow);
    z-index: 999;
    display: flex;
    flex-direction: column;
    transition: transform 0.32s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(20px);
}
.ct-selected-drawer.open {
    transform: translate(-50%, 0);
}

.ct-drawer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.1rem 1.4rem;
    border-bottom: 1px solid var(--border);
}
.ct-drawer-title {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text-primary);
}
.ct-drawer-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.ct-drawer-body {
    padding: 1rem 1.4rem;
    overflow-y: auto;
    flex: 1;
}

.ct-selected-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}
.ct-selected-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}
.ct-selected-item:hover {
    border-color: var(--accent);
}
.ct-selected-item-info {
    flex: 1;
    min-width: 0;
}
.ct-selected-item-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.ct-selected-item-meta {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}
.ct-selected-item-ctrls {
    display: flex;
    align-items: center;
    gap: 0.45rem;
}
.ct-selected-item-ctrls input {
    width: 48px;
    text-align: center;
    padding: 0.25rem 0.35rem;
    font-size: 0.88rem;
    font-weight: 700;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
}
.ct-remove-btn {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}
.ct-remove-btn:hover {
    border-color: var(--error, #ef4444);
    color: var(--error, #ef4444);
    background: rgba(239, 68, 68, 0.1);
}

.ct-drawer-foot {
    padding: 1.1rem 1.4rem;
    border-top: 1px solid var(--border);
    background: var(--bg-card);
}

/* ============================================================
   RUNNER
   ============================================================ */
.tr-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.tr-top {
    position: sticky;
    top: 0;
    z-index: 900;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    height: var(--tr-top-h);
    padding: 0 1rem;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
}
.tr-timer {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 1rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 50px;
    padding: 0.4rem 0.85rem;
    flex-shrink: 0;
}
.tr-timer .tr-clock-ico { font-size: 0.9rem; }
.tr-timer.low {
    color: var(--st-red);
    border-color: var(--st-red);
    background: var(--st-red-bg);
    animation: tcpulse 1.6s ease-in-out infinite;
}
@keyframes tcpulse { 50% { opacity: 0.6; } }

.tr-title {
    flex: 1;
    min-width: 0;
    text-align: center;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.tr-top-actions { display: flex; align-items: center; gap: 0.5rem; flex-shrink: 0; }

.tr-grid-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 1.05rem;
    cursor: pointer;
}
.tr-grid-btn:hover { border-color: var(--accent); color: var(--accent); }

.tr-submit {
    padding: 0.55rem 1.15rem;
    background: linear-gradient(135deg, var(--accent-dark), var(--accent));
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
}
.tr-submit:hover { filter: brightness(1.08); }
.tr-submit.ghost {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.tr-submit.ghost:hover { color: var(--accent); border-color: var(--accent); }

.tr-body {
    flex: 1;
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 1.25rem 1rem calc(var(--tr-foot-h) + 1.5rem);
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 1.25rem;
    align-items: start;
}

/* ===== QUESTION CARD ===== */
.q-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.4rem;
}
.q-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: wrap;
    padding-bottom: 0.9rem;
    border-bottom: 1px solid var(--border);
}
.q-no {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}
.q-top-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.q-time-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border-radius: 50px;
    padding: 0.3rem 0.7rem;
    font-variant-numeric: tabular-nums;
}
.q-outcome {
    font-size: 0.75rem;
    font-weight: 800;
    border-radius: 50px;
    padding: 0.3rem 0.7rem;
}
.q-outcome.correct { color: var(--st-green); background: var(--st-green-bg); }
.q-outcome.incorrect { color: var(--st-red); background: var(--st-red-bg); }
.q-outcome.skipped { color: var(--text-muted); background: var(--st-grey-bg); }

.q-mark-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    font-family: inherit;
    font-size: 0.76rem;
    font-weight: 700;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 50px;
    padding: 0.35rem 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.q-mark-btn:hover { border-color: var(--st-purple); color: var(--st-purple); }
.q-mark-btn.on {
    background: var(--st-purple-bg);
    border-color: var(--st-purple);
    color: var(--st-purple);
}

.q-bm-btn {
    width: 34px;
    height: 34px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    cursor: pointer;
    filter: grayscale(1);
    opacity: 0.65;
    transition: all var(--transition-fast);
}
.q-bm-btn:hover { opacity: 1; border-color: var(--accent); }
.q-bm-btn.on {
    filter: none;
    opacity: 1;
    border-color: var(--accent);
    background: var(--accent-glow);
}

.q-tags {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin: 0.9rem 0 0.75rem;
}
.q-section-tag {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent);
    background: var(--accent-glow);
    border-radius: 50px;
    padding: 0.25rem 0.7rem;
}
.q-marks {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-muted);
    background: var(--bg-secondary);
    border-radius: 50px;
    padding: 0.25rem 0.7rem;
}

.q-text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    margin-bottom: 1rem;
    white-space: pre-wrap;
    overflow-wrap: break-word;
    word-break: break-word;
    min-width: 0;
}

/* Universal Image Containment in Question Cards */
.q-card img,
.q-text img,
.opt-text img,
.q-explain img {
    max-width: 100% !important;
    height: auto;
    object-fit: contain;
    box-sizing: border-box;
}
/* ===== 3-TIER IMAGE RENDERING SYSTEM ===== */

/* Tier 1: Explicitly sized author images (e.g. style="width:200px") */
.q-text img[style*="width"],
.q-text img[style*="height"],
.opt-text img[style*="width"],
.opt-text img[style*="height"],
.q-explain img[style*="width"],
.q-explain img[style*="height"] {
    max-width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius-sm);
    display: inline-block;
    vertical-align: middle;
}

/* Tier 2: Inline formula snippets (no explicit width/height in author style) */
.q-text img:not([style*="width"]):not([style*="height"]),
.opt-text img:not([style*="width"]):not([style*="height"]),
.q-explain img:not([style*="width"]):not([style*="height"]),
.q-inline-img {
    display: inline-block;
    vertical-align: -0.32em;
    max-height: 1.65em;
    width: auto;
    margin: 0 0.15rem;
    object-fit: contain;
    background: transparent;
    border: none;
    padding: 0;
}

/* Tier 3: Standalone diagram images with no specified size (e.g. PW / Yakeen tests) */
.q-image-wrap {
    margin: 1.1rem 0 1.25rem 0;
    text-align: center;
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}
.q-image {
    max-width: 100%;
    max-height: 42vh;
    width: auto;
    height: auto;
    object-fit: contain;
    display: block;
    margin: 0 auto;
    background: transparent !important;
    padding: 0.25rem;
    border: none;
    border-radius: var(--radius-md);
}

/* Smart Image Color Inversion in Dark Mode (matching Question Cafe / Quizzy-v4) */
.q-image,
.q-image-wrap img,
.q-images-container img,
.q-text img,
.opt-text img,
.q-sol-body img,
.q-sol-text img {
    max-width: 100% !important;
    height: auto;
    object-fit: contain;
    box-sizing: border-box;
    transition: filter 0.3s ease;
    filter: invert(1) hue-rotate(180deg) brightness(1.1);
    mix-blend-mode: screen;
}

[data-theme="light"] .q-image,
[data-theme="light"] .q-image-wrap img,
[data-theme="light"] .q-images-container img,
[data-theme="light"] .q-text img,
[data-theme="light"] .opt-text img,
[data-theme="light"] .q-sol-body img,
[data-theme="light"] .q-sol-text img {
    filter: none;
    mix-blend-mode: darken;
}

/* ===== MATCH THE COLUMN / LIST-I / LIST-II TABLE ===== */
.match-table-wrap {
    width: 100%;
    overflow-x: auto;
    margin: 1rem 0 1.25rem 0;
    -webkit-overflow-scrolling: touch;
}
.match-table {
    width: 100%;
    max-width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border: 2px solid var(--border-strong);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    color: var(--text-primary);
    table-layout: auto;
}
.match-table thead tr {
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-strong);
}
.match-table th.match-th {
    padding: 0.65rem 0.85rem;
    text-align: center;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.2px;
}
.match-table th.match-th:first-child {
    border-right: 2px solid var(--border-strong);
}
.match-table tbody tr {
    border-bottom: 1px solid var(--border-strong);
}
.match-table tbody tr:last-child {
    border-bottom: none;
}
.match-table td {
    padding: 0.65rem 0.85rem;
    vertical-align: middle;
}
.match-table td.match-col-label {
    width: 3.5rem;
    min-width: 3rem;
    text-align: center;
    font-weight: 700;
    color: var(--text-primary);
    border-right: 1px solid var(--border);
    white-space: nowrap;
}
.match-table td.match-col-content {
    line-height: 1.55;
    color: var(--text-primary);
}
.match-table td.match-col-content:first-of-type {
    border-right: 2px solid var(--border-strong);
}
.match-table .match-item-text {
    font-size: 0.95rem;
}
.match-table .match-item-img-wrap {
    margin-top: 0.4rem;
}
.match-table .match-item-img {
    max-width: 100%;
    height: auto;
    max-height: 140px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}
@media (max-width: 600px) {
    .match-table th.match-th,
    .match-table td {
        padding: 0.5rem 0.55rem;
        font-size: 0.88rem;
    }
    .match-table td.match-col-label {
        width: 2.5rem;
        min-width: 2.2rem;
    }
}

/* ===== EMBEDDED QUESTION TABLES ===== */
.q-text table {
    width: 100%;
    max-width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}
.q-text th,
.q-text td {
    border: 1px solid var(--border);
    padding: 0.65rem 0.85rem;
    vertical-align: middle;
    font-size: 0.95rem;
    line-height: 1.55;
    color: var(--text-primary);
}
.q-text th {
    background: rgba(0, 191, 165, 0.08);
    font-weight: 700;
}
.q-text td.td-label {
    white-space: nowrap !important;
    text-align: center !important;
    font-weight: 700 !important;
    width: 3.2rem !important;
    min-width: 3rem !important;
    color: var(--teal-accent, #00bfa5) !important;
    background: rgba(0, 191, 165, 0.04);
}
.q-text th.th-empty,
.q-text th:empty {
    background: transparent !important;
    border-top-color: transparent !important;
    border-left-color: transparent !important;
    border-right-color: transparent !important;
    border-bottom: 1.5px solid var(--border) !important;
    width: 3.2rem !important;
    min-width: 3rem !important;
}
.q-text td img {
    max-width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius-sm);
    display: inline-block;
    vertical-align: middle;
}
@media (max-width: 600px) {
    .q-text table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .q-text th,
    .q-text td {
        padding: 0.45rem 0.55rem;
        font-size: 0.86rem;
    }
}

/* ===== OPTIONS ===== */
.q-options { display: flex; flex-direction: column; gap: 0.6rem; }
.opt {
    width: 100%;
    display: flex;
    align-items: flex-start;
    gap: 0.85rem;
    padding: 0.9rem 1rem;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    text-align: left;
    font-family: inherit;
    font-size: 0.92rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.opt:not(:disabled):hover {
    border-color: var(--accent);
    background: var(--bg-hover);
}
.opt:disabled { cursor: default; }

.opt-key {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    font-size: 0.78rem;
    font-weight: 800;
    color: var(--text-muted);
}
.opt-body { flex: 1; min-width: 0; }
.opt-text { display: block; line-height: 1.55; white-space: pre-wrap; overflow-wrap: break-word; word-break: break-word; min-width: 0; }
.opt-image { display: block; max-width: 100%; margin-top: 0.4rem; border-radius: var(--radius-sm); }
.opt-flag {
    display: inline-block;
    margin-top: 0.45rem;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.2px;
    text-transform: uppercase;
    opacity: 0.9;
}

.opt.selected {
    border-color: var(--accent);
    background: var(--accent-glow);
    color: var(--text-primary);
}
.opt.selected .opt-key {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
.opt.correct {
    border-color: var(--st-green);
    background: var(--st-green-bg);
    color: var(--text-primary);
}
.opt.correct .opt-key { background: var(--st-green); border-color: var(--st-green); color: #fff; }
.opt.correct .opt-flag { color: var(--st-green); }
.opt.incorrect {
    border-color: var(--st-red);
    background: var(--st-red-bg);
    color: var(--text-primary);
}
.opt.incorrect .opt-key { background: var(--st-red); border-color: var(--st-red); color: #fff; }
.opt.incorrect .opt-flag { color: var(--st-red); }

.q-clear-btn {
    margin-top: 0.75rem;
    background: none;
    border: none;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
    text-decoration: underline;
}
.q-clear-btn:hover { color: var(--error); }

.q-integer { display: flex; flex-direction: column; gap: 0.4rem; }
.q-integer label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    color: var(--text-muted);
}
.q-int-input {
    padding: 0.85rem 1rem;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 700;
    outline: none;
}
.q-int-input:focus { border-color: var(--accent); }
.q-integer-review { display: flex; flex-direction: column; gap: 0.6rem; }

.q-explain {
    margin-top: 1.25rem;
    padding: 1rem 1.1rem;
    background: var(--bg-secondary);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
}
.q-explain h4 {
    font-size: 0.82rem;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 0.45rem;
}
.q-explain p {
    font-size: 0.88rem;
    line-height: 1.7;
    color: var(--text-secondary);
    white-space: pre-wrap;
}
.q-explain-img {
    max-width: 100%;
    max-height: 60vh;
    height: auto;
    object-fit: contain;
    margin-top: 0.6rem;
    border-radius: var(--radius-sm);
    display: block;
}
.q-explain.empty {
    border-left-color: var(--border);
    color: var(--text-muted);
    font-size: 0.82rem;
    font-style: italic;
}

/* ===== SIDE PANEL ===== */
.tr-side {
    position: sticky;
    top: calc(var(--tr-top-h) + 1rem);
    align-self: start;
    max-height: calc(100vh - var(--tr-top-h) - 2rem);
    overflow-y: auto;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1rem;
}
.tr-side-head {
    display: none;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 0.75rem;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}
.tr-side-head h3 { font-size: 0.95rem; font-weight: 800; color: var(--text-primary); }
.tr-side-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
}

.tr-tabs {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    margin-bottom: 0.85rem;
}
.tr-tab {
    flex: 1 1 auto;
    padding: 0.45rem 0.65rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-fast);
}
.tr-tab:hover { color: var(--accent); border-color: var(--accent); }
.tr-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.tr-filters {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    margin-bottom: 0.85rem;
}
.tr-chip {
    padding: 0.35rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
}
.tr-chip:hover { color: var(--accent); border-color: var(--accent); }
.tr-chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.tr-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 0.9rem;
    padding: 0.75rem;
    margin-bottom: 0.85rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}
.tr-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.73rem;
    color: var(--text-muted);
}
.tr-legend .dot {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}
.tr-legend .dot.answered { background: var(--st-green); }
.tr-legend .dot.wrong { background: var(--st-red); }
.tr-legend .dot.visited { background: var(--st-red); }
.tr-legend .dot.marked { background: var(--st-purple); }
.tr-legend .dot.unvisited { background: var(--st-grey-bg); border: 1px solid var(--border-strong); }

.tr-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
    gap: 0.45rem;
}
.tr-cell {
    aspect-ratio: 1 / 1;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1.5px solid var(--border);
    background: var(--st-grey-bg);
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 800;
    cursor: pointer;
    position: relative;
    transition: transform var(--transition-fast);
}
.tr-cell:hover { transform: scale(1.08); }
.tr-cell.answered { background: var(--st-green); border-color: var(--st-green); color: #fff; }
.tr-cell.wrong { background: var(--st-red); border-color: var(--st-red); color: #fff; }
.tr-cell.visited { background: var(--st-red); border-color: var(--st-red); color: #fff; }
.tr-cell.marked,
.tr-cell.marked-answered { background: var(--st-purple); border-color: var(--st-purple); color: #fff; }
/* Marked *and* answered — the purple still wins, with a green tick dot. */
.tr-cell.marked-answered::after {
    content: '';
    position: absolute;
    right: -1px;
    bottom: -1px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--st-green);
    border: 2px solid var(--bg-card);
}
.tr-cell.current {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}
.tr-grid-empty {
    font-size: 0.82rem;
    color: var(--text-muted);
    text-align: center;
    padding: 1.25rem 0.5rem;
}

.tr-side-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 1100;
}
.tr-side-overlay.active { display: block; }

/* ===== FOOTER NAV ===== */
.tr-foot {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 950;
    height: calc(var(--tr-foot-h) + env(safe-area-inset-bottom));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0 1rem env(safe-area-inset-bottom);
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
}
.tr-nav-btn {
    flex: 1;
    max-width: 220px;
    padding: 0.8rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.tr-nav-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.tr-nav-btn.skip {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-muted);
    opacity: 0.85;
}
.tr-nav-btn.skip:hover:not(:disabled) {
    border-color: var(--text-muted);
    color: var(--text-primary);
    opacity: 1;
}
.tr-nav-btn.next {
    background: linear-gradient(135deg, var(--accent-dark), var(--accent));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 3px 10px rgba(108, 92, 231, 0.3);
}
.tr-nav-btn.next.submit {
    background: linear-gradient(135deg, #10b981, #059669);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 3px 10px rgba(16, 185, 129, 0.35);
}
.tr-nav-btn.next:disabled { background: var(--bg-secondary); color: var(--text-muted); box-shadow: none; }

/* ===== SUBMIT MODAL ===== */
.tc-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1500;
    background: rgba(0, 0, 0, 0.6);
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
}
.tc-modal-overlay.active { display: flex; }
.tc-modal {
    width: 100%;
    max-width: 380px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.6rem;
    text-align: center;
    box-shadow: var(--shadow-md);
}
.tc-modal h3 {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
}
.tc-modal > p { font-size: 0.85rem; color: var(--text-muted); }
.tc-modal-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin: 1.25rem 0;
}
.tc-modal-stats > div {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    padding: 0.7rem 0.35rem;
}
.tc-modal-stats .v {
    display: block;
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-primary);
}
.tc-modal-stats .l { display: block; font-size: 0.68rem; color: var(--text-muted); }
.tc-modal-actions { display: flex; gap: 0.6rem; }
.tc-modal-actions button { flex: 1; padding: 0.75rem; font-weight: 700; }

/* ===== RESULTS ===== */
.rs-banner {
    text-align: center;
    padding: 2.25rem 1.25rem;
    margin: 1.5rem 0;
    background: linear-gradient(135deg, var(--accent-dark), var(--accent));
    border-radius: var(--radius-lg);
    color: #fff;
    box-shadow: 0 8px 28px var(--accent-glow-strong);
}
.rs-banner-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.85;
}
.rs-banner-score {
    font-size: 2.6rem;
    font-weight: 800;
    line-height: 1.15;
    margin: 0.35rem 0;
    font-variant-numeric: tabular-nums;
}
.rs-banner-score span { font-size: 1rem; font-weight: 600; opacity: 0.85; }
.rs-banner-test { font-size: 0.88rem; opacity: 0.9; }

.rs-stats {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.6rem;
    margin-bottom: 2rem;
}
.rs-stat {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 1rem 0.6rem;
    text-align: center;
}
.rs-stat-ico { font-size: 1.1rem; margin-bottom: 0.25rem; }
.rs-stat-v {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}
.rs-stat-l {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    color: var(--text-muted);
    margin-top: 0.15rem;
}
.rs-stat.correct .rs-stat-v { color: var(--st-green); }
.rs-stat.wrong .rs-stat-v { color: var(--st-red); }
.rs-stat.acc .rs-stat-v { color: var(--accent); }
.rs-stat.time .rs-stat-v { font-size: 1.05rem; }

.rs-heading {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}
.rs-table-wrap {
    overflow-x: auto;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}
.rs-table { width: 100%; border-collapse: collapse; min-width: 380px; }
.rs-table th {
    text-align: left;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
    white-space: nowrap;
}
.rs-table td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.88rem;
    color: var(--text-secondary);
    vertical-align: top;
}
.rs-table tr:last-child td { border-bottom: none; }
.rs-sec-name { display: block; font-weight: 700; color: var(--text-primary); }
.rs-sec-sub { display: block; font-size: 0.74rem; color: var(--text-muted); margin-top: 0.2rem; }
.rs-num { font-variant-numeric: tabular-nums; font-weight: 700; white-space: nowrap; }
.rs-score { color: var(--accent); }
.rs-score span { color: var(--text-muted); font-weight: 600; font-size: 0.78rem; }

.rs-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.75rem;
    flex-wrap: wrap;
}
.rs-actions .tc-big-btn { flex: 1 1 200px; }
.rs-actions.secondary { justify-content: center; margin-top: 1rem; }

/* ============================================================
   TEST BOOKMARKS — save panel (Test Cafe) + manager page
   ============================================================ */
.tb-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1600;
    background: rgba(0, 0, 0, 0.55);
}
.tb-overlay.active { display: block; }

.tb-panel {
    position: fixed;
    left: 50%;
    bottom: 0;
    transform: translate(-50%, 100%);
    width: min(460px, 100%);
    max-height: 82vh;
    z-index: 1700;
    display: flex;
    flex-direction: column;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    transition: transform var(--transition-normal);
}
.tb-panel.active { transform: translate(-50%, 0); }
.tb-panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
}
.tb-panel-head h3 { font-size: 1rem; font-weight: 800; color: var(--text-primary); }
.tb-panel-body { flex: 1; overflow-y: auto; padding: 1rem 1.25rem; }
.tb-panel-foot {
    display: flex;
    gap: 0.6rem;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border);
}
.tb-panel-foot .btn { flex: 1; }

.tb-empty-note {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    padding: 1rem 0 1.25rem;
}
.tb-folder { margin-bottom: 0.5rem; }
.tb-folder-head {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.7rem 0.9rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
}
.tb-folder-head:hover { border-color: var(--accent); }
.tb-arrow { color: var(--text-muted); font-size: 0.75rem; transition: transform var(--transition-fast); }
.tb-folder-head.open .tb-arrow { transform: rotate(90deg); }
.tb-folder-body { display: none; padding: 0.4rem 0 0.4rem 0.75rem; }
.tb-folder-body.show { display: block; }
.tb-sub {
    display: block;
    width: 100%;
    text-align: left;
    padding: 0.55rem 0.75rem;
    margin-bottom: 0.3rem;
    background: none;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
}
.tb-sub:hover { background: var(--bg-hover); }
.tb-sub.selected {
    border-color: var(--accent);
    background: var(--accent-glow);
    color: var(--accent);
    font-weight: 700;
}
.tb-inline-add, .tb-new-section {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}
.tb-new-section {
    padding-top: 1rem;
    margin-top: 1rem;
    border-top: 1px solid var(--border);
}
.tb-input {
    flex: 1;
    min-width: 0;
    padding: 0.55rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    outline: none;
}
.tb-input:focus { border-color: var(--accent); }
.tb-mini-btn {
    padding: 0.55rem 0.85rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
    cursor: pointer;
    white-space: nowrap;
}
.tb-mini-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ---- manager page ---- */
.tb-manager-actions {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}
.tb-manager-actions .btn { flex: 1 1 auto; font-size: 0.85rem; }

.tb-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}
.tb-empty-icon { font-size: 2.75rem; margin-bottom: 0.75rem; opacity: 0.6; }
.tb-empty h3 { font-size: 1.05rem; color: var(--text-primary); margin-bottom: 0.4rem; }
.tb-empty p { font-size: 0.88rem; }

.tb-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 0.6rem;
    overflow: hidden;
}
.tb-section-head {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.95rem 1.15rem;
    background: var(--bg-secondary);
    border: none;
    font-family: inherit;
    cursor: pointer;
    text-align: left;
}
.tb-section-left { display: flex; align-items: center; gap: 0.65rem; flex-wrap: wrap; }
.tb-section-icon { font-size: 1.15rem; }
.tb-section-name { font-size: 0.95rem; font-weight: 700; color: var(--text-primary); }
.tb-section-count {
    font-size: 0.72rem;
    color: var(--text-muted);
    background: var(--bg-primary);
    border-radius: 50px;
    padding: 0.15rem 0.6rem;
}
.tb-section.expanded .tb-arrow { transform: rotate(90deg); }
.tb-section-body { display: none; padding: 0.75rem 1.15rem 1rem; }
.tb-section.expanded .tb-section-body { display: block; }
.tb-subfolder { margin-top: 0.85rem; }
.tb-subfolder-head {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.4rem;
}
.tb-subfolder-head span { color: var(--text-muted); font-weight: 600; }
.tb-card-list { display: flex; flex-direction: column; gap: 0.4rem; }

.tb-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.7rem 0.9rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}
.tb-card:hover { border-color: var(--accent); }
.tb-card-main { min-width: 0; flex: 1; }
.tb-card-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}
.tb-card-text {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.tb-card-src { display: block; font-size: 0.72rem; color: var(--text-muted); }
.tb-card-actions { display: flex; gap: 0.4rem; flex-shrink: 0; }
.tb-icon-btn {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
}
.tb-icon-btn.go:hover { border-color: var(--accent); color: var(--accent); }
.tb-icon-btn.del:hover { border-color: var(--error); color: var(--error); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
    .tr-body {
        grid-template-columns: minmax(0, 1fr);
        padding: 1rem 0.85rem calc(var(--tr-foot-h) + 1.25rem + env(safe-area-inset-bottom));
    }
    .tr-grid-btn { display: inline-flex; }
    .tr-title { display: none; }

    /* The navigator becomes a drawer — hidden until the grid button is tapped,
       and closed again as soon as a question is chosen. */
    .tr-side {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        left: auto;
        width: min(340px, 88vw);
        max-height: none;
        z-index: 1200;
        border-radius: 0;
        border-top: none;
        border-bottom: none;
        border-right: none;
        transform: translateX(102%);
        transition: transform var(--transition-normal);
        padding: 1rem 1rem 2rem;
    }
    .tr-side.open { transform: translateX(0); }
    .tr-side-head { display: flex; }
}

@media (max-width: 720px) {
    .tc-wrap { padding: 0 1rem 3rem; }
    .tc-hero { padding: 2rem 0 1rem; }
    .tc-hero h1 { font-size: 1.5rem; }
    /* Three short tiles stay on one row — dropping to two columns would leave
       a hole in the second row. */
    .tc-detail-stats { gap: 0.45rem; }
    .tc-detail-stats .v { font-size: 1.15rem; }
    .tc-detail-stats .l { font-size: 0.66rem; }
    .rs-stats { grid-template-columns: repeat(2, 1fr); }
    .rs-stat.time { grid-column: span 2; }
    .rs-banner-score { font-size: 2.1rem; }
    .rs-actions .tc-big-btn { flex: 1 1 100%; }
    .ct-actions .btn { flex: 1 1 100%; }
    .tb-card { flex-wrap: wrap; }
    .tb-card-text { white-space: normal; }
    .att-actions { width: 100%; }
    .att-actions .btn { flex: 1; }
    .tc-resume-actions { width: 100%; }
    .tc-resume-actions .btn { flex: 1; }
}

@media (max-width: 520px) {
    .q-card { padding: 1.1rem 0.95rem; }
    .q-card-top { gap: 0.5rem; }
    .q-no { font-size: 0.98rem; }
    .q-top-actions { gap: 0.35rem; }
    .q-mark-btn { font-size: 0.72rem; padding: 0.3rem 0.6rem; }
    .opt { padding: 0.8rem 0.75rem; gap: 0.65rem; font-size: 0.88rem; }
    .opt-key { width: 25px; height: 25px; font-size: 0.72rem; }
    .q-image { max-height: 30vh; }
    .tr-top { padding: 0 0.75rem; gap: 0.5rem; }
    .tr-timer { font-size: 0.9rem; padding: 0.35rem 0.7rem; }
    .tr-submit { padding: 0.5rem 0.9rem; font-size: 0.82rem; }
    .tr-foot { padding: 0 0.75rem env(safe-area-inset-bottom); }
    .tr-nav-btn { max-width: none; padding: 0.75rem 0.5rem; font-size: 0.85rem; }
    .rs-banner-score { font-size: 1.85rem; }
    .tc-detail-card { padding: 1.25rem 1.1rem; }
}

/* ===== MATCH-LIST TABLE (OPTION 1) ===== */
.q-match-container {
    margin: 1.1rem 0 1.4rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    overflow: hidden;
}
.q-match-header {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--bg-card);
    border-bottom: 2px solid var(--border);
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.92rem;
}
.q-match-col-head {
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
}
.q-match-col-head:first-child {
    border-right: 1px solid var(--border);
}
.q-match-body {
    display: flex;
    flex-direction: column;
}
.q-match-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-bottom: 1px solid var(--border);
}
.q-match-row:last-child {
    border-bottom: none;
}
.q-match-cell {
    padding: 0.85rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: var(--bg-card);
}
.q-match-cell:first-child {
    border-right: 1px solid var(--border);
}
.q-match-cell-head {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}
.q-match-badge {
    font-weight: 800;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    font-size: 0.82rem;
    flex-shrink: 0;
}
.q-match-text {
    color: var(--text-primary);
    font-size: 0.88rem;
    line-height: 1.45;
}
.q-match-img-wrap {
    text-align: center;
    background: var(--bg-primary);
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    display: inline-block;
    max-width: 100%;
}
.q-match-img {
    max-width: 100%;
    max-height: 140px;
    object-fit: contain;
    border-radius: 4px;
    display: block;
    margin: 0 auto;
}

/* Solution multiple images */
.q-explain-images {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    margin-top: 0.85rem;
}
.q-explain-img-wrap {
    background: var(--bg-primary);
    padding: 0.6rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    text-align: center;
}
.q-explain-img {
    max-width: 100%;
    max-height: 320px;
    object-fit: contain;
    border-radius: 4px;
}

/* ===== HIERARCHICAL CUSTOM BUILDER ===== */
.ct-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}
.ct-search-wrap {
    position: relative;
    flex: 1 1 240px;
    max-width: 480px;
}
.ct-search-icon {
    position: absolute;
    left: 0.85rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.9rem;
    color: var(--text-muted);
    pointer-events: none;
}
.ct-search-input {
    width: 100%;
    padding: 0.6rem 0.85rem 0.6rem 2.2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.88rem;
    outline: none;
    transition: border-color var(--transition-fast);
}
.ct-search-input:focus {
    border-color: var(--accent);
}
.ct-tree-actions {
    display: flex;
    gap: 0.5rem;
}
.ct-folder {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    margin-bottom: 0.85rem;
    overflow: hidden;
    transition: all var(--transition-fast);
}
.ct-folder-head {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.85rem 1.1rem;
    background: var(--bg-secondary);
    cursor: pointer;
    user-select: none;
}
.ct-folder-head:hover {
    background: var(--bg-hover);
}
.ct-folder-icon { font-size: 1.1rem; }
.ct-folder-name {
    font-weight: 700;
    font-size: 0.94rem;
    color: var(--text-primary);
    flex: 1;
}
.ct-folder-badge {
    font-size: 0.75rem;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    background: var(--bg-primary);
    color: var(--text-muted);
    font-weight: 600;
    border: 1px solid var(--border);
}
.ct-folder-arrow {
    font-size: 0.78rem;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}
.ct-folder.open > .ct-folder-head .ct-folder-arrow {
    transform: rotate(180deg);
}
.ct-folder-body {
    display: none;
    padding: 0.85rem 0.85rem 0.2rem;
    border-top: 1px solid var(--border);
}
.ct-folder.open > .ct-folder-body {
    display: block;
}
.ct-folder-body .ct-folder {
    border-color: var(--border);
    margin-bottom: 0.65rem;
    background: var(--bg-primary);
}
.ct-folder-body .ct-folder > .ct-folder-head {
    background: var(--bg-card);
    padding: 0.65rem 0.95rem;
}

@media (max-width: 640px) {
    .q-match-header, .q-match-row {
        grid-template-columns: 1fr;
    }
    .q-match-col-head:first-child, .q-match-cell:first-child {
        border-right: none;
        border-bottom: 1px dashed var(--border);
    }
}

/* MathJax & KaTeX display formula margins */
.katex, mjx-container {
    color: inherit;
    outline: none;
}
.katex-display, mjx-container[jax="CHTML"][display="true"] {
    overflow-x: auto !important;
    overflow-y: hidden !important;
    max-width: 100% !important;
    margin: 0.55em 0 !important;
    padding: 0.25rem 0 !important;
    -webkit-overflow-scrolling: touch;
}