:root {
    --pmcq-line: #d8e0e7;
    --pmcq-bg: #f2f5f8;
    --pmcq-ink: #1c2b36;
    --pmcq-ink-soft: #51626f;
    --pmcq-correct: #1e7d3c;
    --pmcq-correct-bg: #e7f5eb;
    --pmcq-incorrect: #b3261e;
    --pmcq-incorrect-bg: #fdeceb;
    --bs-primary: #0b3d5c;
    --bs-primary-rgb: 11, 61, 92;
    --bs-secondary: #2e8b8b;
    --bs-secondary-rgb: 46, 139, 139;
    --bs-success: #2e8b57;
    --bs-info: #2e8b8b;
    --bs-warning: #e0a526;
    --bs-danger: #c0392b;
    --bs-light: #f7f9fa;
    --bs-body-bg: #f4f7f8;
    --bs-body-color: #1f2d3a;
    --bs-link-color: #0b3d5c;
    --bs-link-hover-color: #082c42;
    --tadrees-accent: #e0a526;
    /* Bootstrap's stack plus math-capable fallbacks, so Unicode sub/superscripts (H₂O, x², 10⁻⁶),
       Greek letters and operators (θ λ Δ √ ≤ → ∠) render from a font that has them on every OS. */
    --bs-font-sans-serif: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "Liberation Sans", Arial,
        "Segoe UI Symbol", "Cambria Math", "STIX Two Math", "Noto Sans Math", "Noto Sans Symbols", "Noto Sans Symbols 2",
        "DejaVu Sans", "Apple Symbols", sans-serif, "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji";
}

.btn-primary {
    background-color: var(--bs-primary);
    border-color: var(--bs-primary);
}

.btn-accent {
    background-color: var(--tadrees-accent);
    border-color: var(--tadrees-accent);
    color: #1f2d3a;
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: .02em;
    display: inline-flex;
    align-items: center;
}

.navbar-logo-badge {
    display: inline-flex;
    align-items: center;
    background: #fff;
    border-radius: .4rem;
    padding: .15rem .35rem;
    margin-right: .5rem;
}

.navbar-logo {
    height: 28px;
    width: auto;
    display: block;
}

.app-navbar {
    background: linear-gradient(90deg, var(--bs-primary), #114f74);
}

.app-navbar .nav-link,
.app-navbar .navbar-brand {
    color: #fff !important;
}

.app-navbar .nav-link:hover {
    color: var(--tadrees-accent) !important;
}

/* Applies to every modal in the app — one consistent themed header instead of the Bootstrap
   default white, matching the navbar's brand color. */
.modal-header {
    background: linear-gradient(90deg, var(--bs-primary), #114f74);
    color: #fff;
    border-bottom: none;
}

.modal-header .modal-title {
    color: #fff;
}

.modal-header .btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}

.card {
    border: none;
    box-shadow: 0 1px 4px rgba(11, 61, 92, .08);
    border-radius: .6rem;
}

.stat-card {
    border-left: 4px solid var(--bs-secondary);
}

.plan-card {
    border: 2px solid var(--pmcq-line);
    overflow: visible;
}

.plan-card-premium {
    border-color: var(--tadrees-accent);
    background: linear-gradient(180deg, rgba(224, 165, 38, .08), transparent 45%);
}

.plan-badge-free {
    position: absolute;
    top: -.65rem;
    right: 1rem;
    font-size: .8rem;
    font-weight: 700;
    letter-spacing: .05em;
    padding: .4rem .8rem;
    border-radius: 999px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, .18);
}

.plan-feature-list li {
    padding: .3rem 0;
}

.plan-feature-list i {
    margin-right: .5rem;
    width: 1rem;
}

.info-hint {
    display: flex;
    align-items: flex-start;
    gap: .6rem;
    border-left: 4px solid var(--bs-info);
    padding-right: 2.5rem;
}

.info-hint i {
    margin-top: .15rem;
    flex-shrink: 0;
}

.info-hint-body {
    flex-grow: 1;
}

/* ---------- Dashboard: colorful stat + course cards, hover animation ---------- */
:root {
    --stat-blue: #2f6fb0;
    --stat-teal: #1f8a83;
    --stat-purple: #7952b3;
    --stat-indigo: #4a5fc1;
    --stat-cyan: #128a9c;
    --stat-amber: #c9822c;
    --stat-rose: #b5406a;
    --stat-green: #2e8b57;
}

.stat-card {
    position: relative;
    overflow: hidden;
    border-left: none;
    border-top: 4px solid var(--stat-accent, var(--bs-secondary));
    background-color: var(--stat-accent-tint, rgba(46, 139, 139, .14));
    transition: transform .22s cubic-bezier(.2, .7, .3, 1), box-shadow .22s ease, background-color .22s ease;
    will-change: transform;
}

.stat-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 28px rgba(11, 61, 92, .18);
    background-color: var(--stat-accent-tint-hover, rgba(46, 139, 139, .22));
}

.stat-card .stat-icon {
    position: absolute;
    top: .55rem;
    right: .65rem;
    font-size: 1.7rem;
    opacity: .22;
    color: var(--stat-accent, var(--bs-primary));
    transition: transform .3s ease, opacity .3s ease;
}

.stat-card:hover .stat-icon {
    transform: scale(1.2) rotate(-6deg);
    opacity: .4;
}

.stat-card-1 { --stat-accent: var(--stat-blue);   --stat-accent-tint: rgba(47, 111, 176, .16); --stat-accent-tint-hover: rgba(47, 111, 176, .26); }
.stat-card-2 { --stat-accent: var(--stat-teal);   --stat-accent-tint: rgba(31, 138, 131, .16); --stat-accent-tint-hover: rgba(31, 138, 131, .26); }
.stat-card-3 { --stat-accent: var(--stat-purple); --stat-accent-tint: rgba(121, 82, 179, .16); --stat-accent-tint-hover: rgba(121, 82, 179, .26); }
.stat-card-4 { --stat-accent: var(--stat-indigo); --stat-accent-tint: rgba(74, 95, 193, .16);  --stat-accent-tint-hover: rgba(74, 95, 193, .26); }
.stat-card-5 { --stat-accent: var(--stat-cyan);   --stat-accent-tint: rgba(18, 138, 156, .16); --stat-accent-tint-hover: rgba(18, 138, 156, .26); }
.stat-card-6 { --stat-accent: var(--stat-amber);  --stat-accent-tint: rgba(201, 130, 44, .18); --stat-accent-tint-hover: rgba(201, 130, 44, .28); }

.course-card {
    position: relative;
    overflow: hidden;
    border-top: 4px solid var(--course-accent, var(--bs-primary));
    background-color: var(--course-accent-tint, rgba(11, 61, 92, .06));
    transition: transform .22s cubic-bezier(.2, .7, .3, 1), box-shadow .22s ease, background-color .22s ease;
}

.course-card:hover {
    transform: translateY(-6px) scale(1.012);
    box-shadow: 0 18px 32px rgba(11, 61, 92, .2);
    background-color: var(--course-accent-tint-hover, rgba(11, 61, 92, .11));
}

.course-card-0 { --course-accent: var(--stat-blue);   --course-accent-tint: rgba(47, 111, 176, .13); --course-accent-tint-hover: rgba(47, 111, 176, .22); }
.course-card-1 { --course-accent: var(--stat-teal);   --course-accent-tint: rgba(31, 138, 131, .13); --course-accent-tint-hover: rgba(31, 138, 131, .22); }
.course-card-2 { --course-accent: var(--stat-purple); --course-accent-tint: rgba(121, 82, 179, .13); --course-accent-tint-hover: rgba(121, 82, 179, .22); }
.course-card-3 { --course-accent: var(--stat-indigo); --course-accent-tint: rgba(74, 95, 193, .13);  --course-accent-tint-hover: rgba(74, 95, 193, .22); }
.course-card-4 { --course-accent: var(--stat-rose);   --course-accent-tint: rgba(181, 64, 106, .13); --course-accent-tint-hover: rgba(181, 64, 106, .22); }
.course-card-5 { --course-accent: var(--stat-amber);  --course-accent-tint: rgba(201, 130, 44, .15); --course-accent-tint-hover: rgba(201, 130, 44, .24); }

/* gentle lift for every other plain card on the dashboard so hover feels consistent app-wide */
.card:not(.stat-card):not(.course-card):not(.feature-card):not(.quiz-card):not(.inprogress-card) {
    transition: transform .18s ease, box-shadow .18s ease;
}
.card:not(.stat-card):not(.course-card):not(.feature-card):not(.quiz-card):not(.inprogress-card):hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(11, 61, 92, .1);
}

.badge-difficulty-easy { background-color: #2e8b57; }
.badge-difficulty-moderate { background-color: var(--tadrees-accent); color: #1f2d3a; }
.badge-difficulty-difficult { background-color: var(--bs-danger); }

.quiz-option {
    text-align: left;
    white-space: normal;
}

.quiz-option.selected {
    border-color: var(--bs-primary);
    background-color: rgba(11, 61, 92, .08);
}

.quiz-option.correct {
    border-color: #2e8b57;
    background-color: rgba(46, 139, 87, .15);
}

.quiz-option.incorrect {
    border-color: var(--bs-danger);
    background-color: rgba(192, 57, 43, .12);
}

/* --- Landing page --- */

.full-bleed {
    width: 100vw;
    position: relative;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
}

.hero-section {
    background: radial-gradient(1200px 500px at 10% -10%, rgba(224, 165, 38, .25), transparent),
                linear-gradient(120deg, var(--bs-primary), #0e4a6e 55%, var(--bs-secondary));
    color: #fff;
    padding: 3.5rem 1.5rem 3rem;
    margin-top: 1rem;
    border-radius: 1rem;
}

.hero-section .lead {
    color: rgba(255, 255, 255, .9);
}

.hero-logo-badge {
    display: flex;
    width: fit-content;
    margin: 0 auto;
    background: #fff;
    border-radius: 1rem;
    padding: .6rem 1.25rem;
    box-shadow: 0 8px 20px rgba(0, 0, 0, .18);
}

.hero-logo {
    height: 168px;
    width: auto;
}

.hero-badge {
    background: rgba(255, 255, 255, .15);
    border: 1px solid rgba(255, 255, 255, .35);
    border-radius: 2rem;
    padding: .35rem 1rem;
    display: inline-block;
    font-size: .85rem;
    letter-spacing: .03em;
}

.feature-card {
    height: 100%;
    transition: transform .15s ease, box-shadow .15s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 24px rgba(11, 61, 92, .14);
}

.feature-icon {
    width: 3rem;
    height: 3rem;
    border-radius: .75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(11, 61, 92, .08);
    color: var(--bs-primary);
    font-size: 1.4rem;
}

.level-card {
    border: 1px dashed rgba(11, 61, 92, .25);
}

.level-card.coming-soon {
    opacity: .7;
}

.level-card-clickable {
    cursor: pointer;
    transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}

.level-card-clickable:hover,
.level-card-clickable:focus-visible {
    transform: translateY(-4px);
    box-shadow: 0 10px 24px rgba(11, 61, 92, .14);
    border-color: var(--bs-primary);
}

.stat-pill {
    background: rgba(255, 255, 255, .12);
    border-radius: .6rem;
    padding: .75rem 1rem;
}

@media (max-width: 767.98px) {
    .hero-section {
        padding: 3rem 1rem 3rem;
    }
}

/* --- Quiz UI, ported from physiology-mcq/css/style.css for visual/behavioral parity --- */

.quiz-meta {
    display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px;
}
.chip {
    display: inline-block; padding: 3px 10px; border-radius: 999px;
    background: var(--pmcq-bg); border: 1px solid var(--pmcq-line);
    font-size: .78rem; color: var(--pmcq-ink-soft); font-weight: 600;
}
.chip-chapter { background: #e8f1f8; color: var(--bs-primary); border-color: #c4d8e8; }
.chip-diff.easy      { background: var(--pmcq-correct-bg); color: var(--pmcq-correct); border-color: #bfe3c8; }
.chip-diff.moderate  { background: #fff3d6; color: #8a5a00; border-color: #ecd9a0; }
.chip-diff.difficult { background: var(--pmcq-incorrect-bg); color: var(--pmcq-incorrect); border-color: #f2c4c1; }
.chip-topic { max-width: 100%; }

.progress-row { margin-bottom: 18px; }
.progress-row span { font-size: .88rem; color: var(--pmcq-ink-soft); font-weight: 600; }
.progress-track {
    height: 10px; background: var(--pmcq-line); border-radius: 999px;
    overflow: hidden; margin-top: 6px;
}
.progress-fill {
    height: 100%; width: 0%;
    background: linear-gradient(90deg, var(--bs-secondary), #0a5f5e);
    border-radius: 999px; transition: width .25s ease;
}

.question-text {
    font-size: 1.06rem; line-height: 1.6; margin: 0 0 18px; color: var(--pmcq-ink);
    white-space: pre-line;
}

.options { display: flex; flex-direction: column; gap: 10px; }
.option-btn {
    display: flex; gap: 12px; align-items: flex-start; width: 100%;
    text-align: left; padding: 13px 14px; font-size: .98rem; line-height: 1.5;
    background: #fff; border: 2px solid var(--pmcq-line); border-radius: 10px;
    cursor: pointer; color: var(--pmcq-ink); transition: border-color .12s, background .12s;
    min-height: 48px;
}
.option-btn:hover:not([disabled]) { border-color: var(--bs-secondary); background: #f4faf9; }
.option-btn:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(46, 139, 139, .35); }
.option-btn[disabled] { cursor: default; opacity: .92; }
.option-letter {
    flex: 0 0 auto; width: 28px; height: 28px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    background: var(--pmcq-bg); border: 1px solid var(--pmcq-line);
    font-weight: 700; font-size: .85rem; color: var(--bs-primary);
}
.option-btn.selected { border-color: var(--bs-secondary); background: #eef8f7; }
.option-btn.selected .option-letter { background: var(--bs-secondary); color: #fff; border-color: var(--bs-secondary); }

.option-btn.reveal-correct { border-color: var(--pmcq-correct); background: var(--pmcq-correct-bg); }
.option-btn.reveal-correct .option-letter { background: var(--pmcq-correct); border-color: var(--pmcq-correct); color: #fff; }
.option-btn.reveal-incorrect { border-color: var(--pmcq-incorrect); background: var(--pmcq-incorrect-bg); }
.option-btn.reveal-incorrect .option-letter { background: var(--pmcq-incorrect); border-color: var(--pmcq-incorrect); color: #fff; }
.option-dim { opacity: .55; }

.feedback {
    margin-top: 16px; border-radius: 10px; padding: 14px 16px;
    border: 1px solid var(--pmcq-line);
}
.feedback.verdict-correct   { background: var(--pmcq-correct-bg); border-color: #bfe3c8; }
.feedback.verdict-incorrect { background: var(--pmcq-incorrect-bg); border-color: #f2c4c1; }
.feedback-verdict { margin: 0 0 6px; font-weight: 800; font-size: 1.02rem; }
.verdict-correct .feedback-verdict { color: var(--pmcq-correct); }
.verdict-incorrect .feedback-verdict { color: var(--pmcq-incorrect); }
.feedback-answer { margin: 0 0 10px; font-size: .93rem; }
.feedback-explanation h3 {
    margin: 0 0 4px; font-size: .85rem; text-transform: uppercase;
    letter-spacing: .5px; color: var(--pmcq-ink-soft);
}
.feedback-explanation p { margin: 0; font-size: .93rem; white-space: pre-line; }

.quiz-controls { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }
.quiz-controls .btn { flex: 1 1 auto; }
.keyboard-hint { text-align: center; margin-top: 12px; color: var(--pmcq-ink-soft); }
kbd {
    background: var(--pmcq-bg); border: 1px solid var(--pmcq-line); border-bottom-width: 2px;
    border-radius: 4px; padding: 1px 5px; font-size: .78rem; font-family: inherit;
}

/* ---------- Results / review, same ported palette ---------- */
.score-big {
    display: flex; flex-direction: column; align-items: center;
    min-width: 150px; padding: 14px 20px; border-radius: 12px;
    background: var(--pmcq-bg); border: 1px solid var(--pmcq-line);
}
.score-big .score-value { font-size: 1.9rem; font-weight: 800; color: var(--bs-primary); }
.score-percent { font-size: 1.15rem; font-weight: 700; color: #0a5f5e; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; }
.dot-correct { background: var(--pmcq-correct); }
.dot-incorrect { background: var(--pmcq-incorrect); }
.dot-unanswered { background: #8a97a1; }

.review-item {
    border: 1px solid var(--pmcq-line); border-left-width: 5px;
    border-radius: 10px; padding: 14px 16px; margin-bottom: 12px;
    background: #fff;
}
.review-item.correct   { border-left-color: var(--pmcq-correct); }
.review-item.incorrect { border-left-color: var(--pmcq-incorrect); }
.review-item.unanswered{ border-left-color: #8a97a1; }
.review-item .review-status { font-weight: 800; font-size: .9rem; margin: 0 0 8px; }
.review-item.correct .review-status { color: var(--pmcq-correct); }
.review-item.incorrect .review-status { color: var(--pmcq-incorrect); }
.review-item.unanswered .review-status { color: #5c6b76; }
.review-q { margin: 0 0 10px; font-weight: 600; white-space: pre-line; }
.review-answers { margin: 0 0 8px; font-size: .92rem; }
.review-answers p { margin: 3px 0; }
.review-answers .ans-correct { color: var(--pmcq-correct); font-weight: 600; }
.review-answers .ans-wrong { color: var(--pmcq-incorrect); font-weight: 600; }
.review-explanation {
    background: var(--pmcq-bg); border-radius: 8px; padding: 10px 12px;
    font-size: .9rem; white-space: pre-line;
}
.review-tags { margin: 8px 0 0; font-size: .75rem; color: var(--pmcq-ink-soft); }

/* ---------- In-progress attempt card ---------- */
.inprogress-card { border-left: 4px solid #e0a526; background: #fffaf0; }

/* ---------- Dark "attention" cards (weakest/improving/declining) ---------- */
.insight-card-dark {
    background: linear-gradient(160deg, #1b2c3d, #0f1c29);
    color: #eef3f6;
    border: none;
}
.insight-card-dark h5,
.insight-card-dark h6 {
    color: #fff;
}
.insight-card-dark .text-muted {
    color: rgba(238, 243, 246, .62) !important;
}
.insight-card-dark a:not(.btn) {
    color: #8fd3d0;
}
.insight-card-dark a:not(.btn):hover {
    color: #ffd77a;
}
.insight-card-dark .list-group-item {
    background: transparent;
    color: #eef3f6;
    border-color: rgba(255, 255, 255, .1);
}

/* ---------- Question-review popup (exam detail) ---------- */
.review-popup-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 28, 41, .55);
    z-index: 1040;
}
.review-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1050;
    width: 92vw;
    max-width: 640px;
    max-height: 85vh;
    overflow-y: auto;
    background: #fff;
    border-radius: .75rem;
    padding: 1.25rem;
    box-shadow: 0 24px 60px rgba(0, 0, 0, .35);
}

/* ---------- Click-to-show info popover (course/chapter/topic detail) ---------- */
.info-popover-wrap {
    position: relative;
    display: inline-block;
}
.info-popover-box {
    position: absolute;
    z-index: 1000;
    top: 100%;
    right: 0;
    margin-top: .35rem;
    background: #1c2b36;
    color: #fff;
    padding: .6rem .8rem;
    border-radius: .5rem;
    font-size: .8rem;
    white-space: normal;
    min-width: 240px;
    max-width: 320px;
    box-shadow: 0 10px 24px rgba(0, 0, 0, .3);
    text-align: left;
}
.info-popover-box strong {
    color: #ffd77a;
}

/* ---------- Sparkline legend ---------- */
.sparkline-legend {
    max-height: 130px;
    overflow-y: auto;
    border-top: 1px solid var(--pmcq-line);
    padding-top: 6px;
}
.sparkline-legend-item {
    display: flex;
    justify-content: space-between;
    gap: .5rem;
    font-size: .82rem;
    padding: 2px 0;
}

/* ---------- Practice activity day cards ---------- */
.activity-day-card {
    cursor: pointer;
    transition: transform .12s ease, box-shadow .12s ease, background-color .12s ease, border-color .12s ease, color .12s ease;
    border: 1px solid transparent;
}

/* Green: at least one exam or question that day. */
.activity-day-card.activity-bg-active {
    background: var(--pmcq-correct-bg);
    border-color: #bfe3c8;
    color: var(--pmcq-correct);
}

/* Red: a past/today date with zero activity. */
.activity-day-card.activity-bg-none {
    background: var(--pmcq-incorrect-bg);
    border-color: #f2c4c1;
    color: var(--pmcq-incorrect);
}

/* Grey: a future date — not clickable, nothing to show yet. */
.activity-day-card.activity-future {
    cursor: default;
    background: #e9edf0;
    border-color: #d8dee2;
    color: var(--pmcq-ink-soft);
    opacity: .8;
}

/* Hover gives a deliberately different, bold color (not a tint of the resting state) so the
   clickable affordance reads clearly regardless of which status color the card starts from. */
.activity-day-card:not(.activity-future):hover {
    background: var(--bs-primary);
    border-color: var(--bs-primary);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 8px 18px rgba(11, 61, 92, .3);
}

.activity-day-card.activity-future:hover {
    transform: none;
    box-shadow: none;
}

@media (max-width: 640px) {
    .option-btn { padding: 12px; font-size: .95rem; }
    .quiz-controls { flex-direction: column; }
    .quiz-controls .btn { width: 100%; }
}


/* ---- Public content pages (learn / guides / legal) and footer ---- */
.public-page { max-width: 880px; margin: 0 auto; padding: 1rem 0 2rem; }
.public-page.article { line-height: 1.7; }
.public-page.article h2 { font-size: 1.3rem; margin-top: 1.75rem; color: var(--bs-primary); }
.public-page.article ul, .public-page.article ol { padding-left: 1.4rem; }
.learn-card { border: 1px solid var(--pmcq-line); transition: border-color .12s, box-shadow .12s; }
.learn-card:hover { border-color: var(--bs-secondary); box-shadow: 0 2px 10px rgba(11, 61, 92, .08); }
.sample-q .sample-opt { padding: 4px 8px; border-radius: 6px; }
.sample-q .sample-opt-correct { background: var(--pmcq-correct-bg); }
.site-footer { background: #fff; border-top: 1px solid var(--pmcq-line); padding: 1.25rem 0; font-size: .9rem; color: var(--pmcq-ink-soft); }
.site-footer a { color: var(--pmcq-ink-soft); text-decoration: none; }
.site-footer a:hover { color: var(--bs-primary); text-decoration: underline; }


/* ---- Board results (Gazette) pages ---- */
.results-page { max-width: 1040px; }
.results-tabs .nav-link { color: var(--bs-primary); }
.results-tabs .nav-link.active { background: var(--bs-primary); color: #fff; }
.grade-bar { display: flex; height: 14px; border-radius: 7px; overflow: hidden; background: #e9eef1; min-width: 120px; }
.grade-bar > span { display: block; height: 100%; }
.gb-a1 { background: #1e7d3c; } .gb-a { background: #5aa469; } .gb-b { background: #8fc27a; }
.gb-c { background: #e0c34a; } .gb-d { background: #e89b3f; } .gb-e { background: #d9692f; } .gb-f { background: #b3261e; }
.gb-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 4px; vertical-align: baseline; }
.grade-legend { margin-top: 6px; }
.trend-bars { display: flex; gap: 14px; align-items: flex-end; flex-wrap: wrap; }
.trend-col { text-align: center; width: 64px; }
.trend-bar-wrap { height: 90px; display: flex; align-items: flex-end; background: #f0f4f6; border-radius: 6px; overflow: hidden; }
.trend-bar { width: 100%; background: var(--bs-secondary); }

.stat-box { background: #fff; border: 1px solid var(--pmcq-line); border-radius: 8px; padding: .5rem .25rem; }
.trend-bar-a1 { background: var(--pmcq-correct); }
.trend-bar-sel { outline: 2px solid var(--bs-primary); outline-offset: -2px; }

/* ---- Online book reader ---- */
.book-goto { width: 74px; }
.book-frame { position: relative; display: flex; justify-content: center; background: #e9eef1; border: 1px solid var(--pmcq-line); border-radius: 8px; padding: 8px; user-select: none; -webkit-user-select: none; }
.book-page { display: block; width: 100%; max-width: 720px; height: auto; background: #fff; -webkit-user-drag: none; user-select: none; pointer-events: none; }
.book-frame.book-wide .book-page { max-width: 100%; }
.book-shield { position: absolute; inset: 0; }
.columns-2 { columns: 2; column-gap: 2rem; }
@media (max-width: 640px) { .columns-2 { columns: 1; } }
@media print { .book-reader { display: none !important; } }

/* ---- membership plans ---- */
.plan-card-plus { border: 2px solid var(--tadrees-accent, #e0a526); background: linear-gradient(180deg, #fffdf6, #fff); }
.plan-card-current { box-shadow: 0 0 0 3px rgba(46, 139, 139, .35), 0 8px 22px rgba(11, 61, 92, .1); }
.plan-numbers { display: flex; gap: .6rem; }
.plan-numbers > div { flex: 1; background: #f1f7f8; border: 1px solid var(--pmcq-line); border-radius: 10px; padding: .45rem .5rem; text-align: center; line-height: 1.15; }
.plan-numbers strong { display: block; font-size: 1.5rem; color: var(--bs-primary); }
.plan-numbers span { font-size: .72rem; color: #6b7b88; }
.plan-compare { border: 1px solid var(--pmcq-line); border-radius: 12px; }
.plan-compare table thead th { background: #f3f7f9; color: var(--bs-primary); font-size: .8rem; }

/* ---- My Notes & bookmarks ---- */
.study-mark { margin: .25rem 0 .75rem; }
.study-mark-buttons { display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; }
.study-note-editor { margin-top: .5rem; max-width: 640px; }
.study-note-preview { margin: .5rem 0 0; padding: .45rem .7rem; background: #eef8fa; border-left: 3px solid var(--bs-info, #0dcaf0); border-radius: 6px; font-size: .9rem; white-space: pre-wrap; }
.study-tabs { display: flex; flex-wrap: wrap; gap: .4rem; }
.study-tab { border: 1px solid var(--pmcq-line); background: #fff; border-radius: 999px; padding: .35rem .85rem; font-size: .9rem; color: var(--bs-primary); cursor: pointer; }
.study-tab.active { background: var(--bs-primary); color: #fff; border-color: var(--bs-primary); }
.study-tab-count { display: inline-block; min-width: 1.4rem; padding: 0 .35rem; margin-left: .2rem; border-radius: 999px; background: rgba(0,0,0,.08); font-size: .75rem; text-align: center; }
.study-tab.active .study-tab-count { background: rgba(255,255,255,.25); }
.study-list { display: grid; gap: .75rem; }
.study-card { padding: .75rem .9rem; border-left: 4px solid var(--bs-secondary); }
.study-card.study-question { border-left-color: var(--bs-primary); }
.study-card.study-page { border-left-color: #6f42c1; }
.study-card.study-formula { border-left-color: #e0a526; }
.study-card.status-mastered { opacity: .8; border-left-color: var(--pmcq-correct, #2e9d6a); }
.study-card-head, .study-card-foot { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; }
.study-card-foot { margin-top: .5rem; padding-top: .5rem; border-top: 1px dashed var(--pmcq-line); }
.study-kind { font-size: .78rem; font-weight: 600; text-transform: uppercase; letter-spacing: .03em; color: var(--bs-primary); }
.study-course { font-size: .78rem; color: #6b7b88; }
.study-q { margin: .5rem 0; font-weight: 500; }
.study-body { margin-top: .4rem; padding: .5rem .75rem; background: #fffbe9; border-left: 3px solid #e0a526; border-radius: 6px; white-space: pre-wrap; }
.study-formula { font-family: "Cambria Math", Cambria, Georgia, serif; font-size: 1.05rem; background: #f3f7fb; border-left-color: var(--bs-primary); }
.study-status { width: auto; min-width: 8.5rem; }
.study-star { color: #b8c2c9; }
.study-star.on { color: #e0a526; }
.study-tag { border: 0; background: #e8f1f4; color: var(--bs-primary); border-radius: 999px; padding: .1rem .55rem; font-size: .78rem; }
.study-tag:hover { background: #d3e6ec; }
.study-editor { border: 2px solid var(--bs-secondary); }
@media (max-width: 576px) { .study-status { min-width: 7rem; } }

/* ---- Book pages shown under a question (figures, tables, examples the question refers to) ---- */
.qref { margin: .5rem 0 1rem; display: flex; flex-direction: column; gap: .6rem; }
.qref-card { border: 1px solid var(--pmcq-line); border-radius: 10px; background: #f8fbfc; overflow: hidden; }
.qref-head { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; padding: .45rem .7rem; background: #eef6f8; border-bottom: 1px solid var(--pmcq-line); font-size: .9rem; }
.qref-title { flex: 1 1 14rem; min-width: 0; }
.qref-actions { display: flex; gap: .4rem; flex-wrap: wrap; }
.qref-frame { position: relative; display: flex; justify-content: center; padding: 8px; background: #e9eef1; max-height: 460px; overflow: auto; user-select: none; -webkit-user-select: none; }
.qref-frame.qref-open { max-height: none; overflow: visible; }
.qref-frame { align-items: flex-start; }
.qref-frame .book-page { max-width: 760px; flex: none; height: auto; }
@media (max-width: 600px) { .qref-frame { max-height: 380px; padding: 4px; } }