/* ============================================================
   QUIZ-THEME.CSS — PlumbMate Unified Quiz Styling
   ============================================================
   Drop-in modernisation for module quizzes & revision tests.
   Works with quiz-theme.js which sets CSS custom-properties
   and injects the SVG blueprint-grid background.
   ============================================================ */

/* ── CSS Variables (defaults — overridden by quiz-theme.js) ── */
:root {
    --navy: #1a2744;
    --navy-dark: #111c33;
    --navy-light: #243556;
    --blue-accent: #3b82f6;
    --teal: #14b8a6;
    --text-dark: #1e293b;
    --text-mid: #475569;
    --text-light: #64748b;
    --green: #16a34a;
    --green-dark: #16a34a;
    --red: #ef4444;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
    --radius: 16px;
    --radius-sm: 10px;

    /* Unit theme — set by JS */
    --unit-accent: #3b82f6;
    --unit-accent-light: #eff6ff;
    --unit-accent-dark: #1e40af;
    --unit-bg: #f8fafc;
    --unit-tint: rgba(59,130,246,0.12);
    --unit-tint-light: rgba(59,130,246,0.06);
    --unit-stroke: rgba(59,130,246,0.10);
    --unit-stroke-strong: rgba(59,130,246,0.16);
}

/* ── Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

/* ── Reset & Base ── */
* { margin: 0; padding: 0; box-sizing: border-box; }

/* ── Skip Link (WCAG 2.4.1) ── */
.skip-link {
    position: absolute;
    top: -60px;
    left: 0;
    background: var(--navy);
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95em;
    border-radius: 0 0 8px 0;
    z-index: 9999;
    transition: top 0.2s ease;
}
.skip-link:focus {
    top: 0;
}

/* ── Focus Styles (WCAG 2.2 SC 2.4.13) ── */
*:focus { outline: none; }
*:focus-visible {
    outline: 3px solid var(--blue-accent);
    outline-offset: 3px;
    border-radius: 4px;
}
header *:focus-visible {
    outline-color: white;
}
.flag-btn:focus-visible {
    outline-width: 2px;
    outline-offset: 2px;
}

/* ── Scroll Padding (WCAG 2.2 SC 2.4.11 — accounts for fixed header + floating bar) ── */
html {
    scroll-padding-top: 90px;
    scroll-padding-bottom: 120px;
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif !important;
    background-color: var(--unit-bg) !important;
    color: var(--text-dark);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ── Blueprint Grid Background (injected by JS) ── */
.quiz-themed-bg {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none;
}
.quiz-themed-bg svg { width: 100%; height: 100%; }

/* ── Header ── */
header {
    background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 50%, var(--navy-light) 100%) !important;
    color: white !important;
    padding: 0 24px !important;
    height: 70px !important;
    display: flex !important;
    align-items: center !important;
    position: sticky !important;
    top: 0 !important;
    z-index: 100 !important;
    box-shadow: 0 2px 20px rgba(0,0,0,0.3) !important;
    border: none !important;
}

header .container,
header .header-inner {
    max-width: 1280px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header h1 {
    font-family: 'Outfit', sans-serif !important;
    font-size: 1.6em !important;
    font-weight: 800 !important;
    letter-spacing: -0.5px;
    color: white !important;
    display: flex;
    align-items: center;
    gap: 12px;
}

header p.tagline {
    font-size: 0.8em !important;
    opacity: 0.7;
    font-weight: 300;
    font-style: italic;
    margin-left: 16px;
    color: white !important;
}

/* ── Quiz Progress Tracker (below banner) ── */
.quiz-progress-tracker {
    background: rgba(255,255,255,0.95) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius) !important;
    padding: 14px 24px !important;
    margin-bottom: 24px !important;
    box-shadow: var(--shadow-sm) !important;
    border: 1px solid var(--unit-tint) !important;
    display: flex;
    align-items: center;
    gap: 16px;
    animation: quizSlideDown 0.5s ease-out;
    position: sticky;
    top: 80px;
    z-index: 90;
}

.quiz-progress-tracker .qpt-label {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 0.85em;
    font-weight: 600;
    color: var(--text-mid);
    white-space: nowrap;
}

.quiz-progress-tracker .qpt-track {
    flex: 1;
    height: 10px;
    background: #e2e8f0;
    border-radius: 10px;
    overflow: hidden;
}

.quiz-progress-tracker .qpt-fill {
    height: 100%;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--unit-accent), var(--green));
    transition: width 0.4s ease-out;
    width: 0%;
}

.quiz-progress-tracker .qpt-count {
    font-family: 'Outfit', sans-serif;
    font-size: 0.95em;
    font-weight: 700;
    color: var(--green-dark);
    white-space: nowrap;
}

/* ── Hide old top-of-page progress bar ── */
body > div[style*="position: sticky"][style*="top: 0"],
body > div[style*="position:sticky"][style*="top:0"],
body > div[style*="position: sticky"][style*="top:0"],
body > div[style*="position:sticky"][style*="top: 0"],
body > div[style*="sticky"][style*="background"][style*="progress" i],
#quiz-progress-bar,
.progress-bar-container {
    display: none !important;
}

/* ── Results Area Layout ── */
.quiz-results-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 16px;
}

/* ── Revision Test Top Results Bar ── */
.revision-top-results {
    border-radius: var(--radius) !important;
    padding: 20px 24px !important;
    margin-bottom: 20px !important;
    animation: quizSlideDown 0.4s ease-out;
}

.revision-top-results.pass {
    background: linear-gradient(135deg, #dcfce7, #bbf7d0) !important;
    border: 2px solid var(--green) !important;
    box-shadow: 0 4px 16px rgba(22,163,74,0.2) !important;
}

.revision-top-results.fail {
    background: linear-gradient(135deg, #fee2e2, #fecaca) !important;
    border: 2px solid var(--red) !important;
    box-shadow: 0 4px 16px rgba(239,68,68,0.2) !important;
}

.rtr-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.rtr-score {
    display: flex;
    align-items: center;
    gap: 10px;
}

.rtr-icon {
    font-size: 1.5em;
    font-weight: 800;
    line-height: 1;
}

.revision-top-results.pass .rtr-icon { color: var(--green) !important; }
.revision-top-results.fail .rtr-icon { color: var(--red) !important; }

.rtr-text {
    font-family: 'Outfit', sans-serif !important;
    font-size: 1.15em;
    font-weight: 700;
    color: var(--navy) !important;
}

.rtr-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.rtr-btn {
    padding: 10px 20px !important;
    border-radius: var(--radius-sm) !important;
    font-family: 'Plus Jakarta Sans', sans-serif !important;
    font-size: 0.9em !important;
    font-weight: 700 !important;
    cursor: pointer;
    text-decoration: none !important;
    transition: all 0.2s ease;
    border: none !important;
    display: inline-flex;
    align-items: center;
}

.rtr-btn:hover {
    transform: translateY(-2px);
}

.rtr-retry {
    background: rgba(100,116,139,0.15) !important;
    color: var(--text-mid) !important;
    border: 1px solid #cbd5e1 !important;
}

.rtr-retry:hover {
    background: rgba(100,116,139,0.25) !important;
}

.rtr-back {
    background: linear-gradient(135deg, var(--unit-accent), var(--unit-accent-dark)) !important;
    color: white !important;
    box-shadow: 0 3px 10px rgba(0,0,0,0.15) !important;
}

.rtr-back:hover {
    box-shadow: 0 5px 16px rgba(0,0,0,0.25) !important;
}

@media (max-width: 600px) {
    .rtr-content { flex-direction: column; align-items: flex-start; }
    .rtr-buttons { width: 100%; }
    .rtr-btn { flex: 1; justify-content: center; text-align: center; }
}

.quiz-results-actions .back-to-unit-btn {
    display: inline-flex !important;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, var(--blue-accent), var(--teal)) !important;
    color: white !important;
    border: none !important;
    padding: 14px 24px !important;
    font-size: 1em !important;
    font-weight: 700 !important;
    font-family: 'Plus Jakarta Sans', sans-serif !important;
    border-radius: var(--radius-sm) !important;
    cursor: pointer;
    text-decoration: none !important;
    transition: all 0.2s ease !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15) !important;
}

.quiz-results-actions .back-to-unit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59,130,246,0.3) !important;
}

/* ── Main Content Area ── */
main,
main.container {
    max-width: 900px !important;
    margin: 0 auto !important;
    padding: 24px 20px 80px !important;
    position: relative;
    z-index: 1;
}

/* ── Back Link ── */
.back-link {
    display: inline-flex !important;
    align-items: center;
    gap: 6px;
    color: var(--blue-accent) !important;
    text-decoration: none !important;
    font-weight: 600 !important;
    font-size: 0.9em !important;
    margin-bottom: 20px !important;
    transition: color 0.2s;
    font-family: 'Plus Jakarta Sans', sans-serif;
}
.back-link:hover { color: var(--teal) !important; }

/* ── Quiz / Test Title Banner ── */
.module-header,
.test-container > .test-header {
    background: rgba(255,255,255,0.92) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius) !important;
    padding: 28px 32px !important;
    margin-bottom: 24px !important;
    box-shadow: var(--shadow-md) !important;
    border: 1px solid var(--unit-tint) !important;
    animation: quizSlideDown 0.5s ease-out;
}

@keyframes quizSlideDown {
    from { opacity: 0; transform: translateY(-16px); }
    to   { opacity: 1; transform: translateY(0); }
}

.module-header h2,
.test-header h3 {
    font-family: 'Outfit', sans-serif !important;
    font-weight: 800 !important;
    color: var(--navy) !important;
    font-size: 1.4em !important;
    display: flex;
    align-items: center;
    gap: 12px;
}

.module-header p,
.test-header p {
    color: var(--text-mid) !important;
    font-size: 0.92em !important;
    margin-top: 4px;
}

/* ── Test Container (revision tests) ── */
.test-container {
    background: transparent !important;
    padding: 0 !important;
    margin: 0 !important;
    border-radius: 0 !important;
    box-shadow: none !important;
}

/* ── Question Cards ── */
.question,
.lesson-section {
    background: rgba(255,255,255,0.94) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius) !important;
    padding: 24px 28px !important;
    margin-bottom: 20px !important;
    box-shadow: var(--shadow-sm) !important;
    border: 2px solid var(--unit-tint) !important;
    border-left: 4px solid var(--unit-accent) !important;
    transition: all 0.3s ease;
}

.question:hover,
.lesson-section:hover {
    box-shadow: var(--shadow-md) !important;
    border-color: var(--unit-tint) !important;
    border-left-color: var(--unit-accent) !important;
}

/* Flagged question override */
.question.flagged {
    background: #fffbeb !important;
    border-left-color: #f59e0b !important;
}

/* ── Question Number ── */
.question-number {
    font-family: 'Outfit', sans-serif !important;
    font-weight: 700 !important;
    color: var(--unit-accent) !important;
    font-size: 0.85em !important;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px !important;
}

/* ── Question Text ── */
.question-text {
    font-size: 1.02rem !important;
    margin-bottom: 16px !important;
    color: var(--text-dark) !important;
    font-weight: 600 !important;
    line-height: 1.5 !important;
}

/* ── Question Image ── */
.question-image {
    max-width: 400px;
    margin: 12px 0 16px !important;
    display: block;
    border: 2px solid var(--unit-tint) !important;
    border-radius: var(--radius-sm) !important;
    box-shadow: var(--shadow-sm);
}

/* ── Answer Options ── */
.options {
    display: flex !important;
    flex-direction: column !important;
    gap: 10px !important;
    list-style: none !important;
    padding: 0 !important;
}

.options li,
.options label {
    padding: 14px 18px !important;
    background: white !important;
    border: 2px solid #e2e8f0 !important;
    border-radius: var(--radius-sm) !important;
    cursor: pointer;
    transition: all 0.2s ease !important;
    list-style: none !important;
    font-size: 0.95em !important;
    font-weight: 500;
    color: var(--text-dark) !important;
    line-height: 1.5;
}

/* Hover state — pale unit colour */
.options li:hover,
.options label:hover {
    border-color: var(--unit-accent) !important;
    background: var(--unit-accent-light) !important;
}

/* Selected state — bold unit colour */
.options li.selected,
.options label.selected,
.options li:has(input:checked) {
    border-color: var(--unit-accent) !important;
    background: var(--unit-accent-light) !important;
    box-shadow: 0 0 0 1px var(--unit-accent), var(--shadow-sm) !important;
    font-weight: 600 !important;
}

/* Correct answer — green */
.options li.correct {
    border-color: var(--green) !important;
    background: #dcfce7 !important;
    box-shadow: 0 0 0 1px var(--green) !important;
}

/* Incorrect answer — red */
.options li.incorrect {
    border-color: var(--red) !important;
    background: #fee2e2 !important;
    box-shadow: 0 0 0 1px var(--red) !important;
}

/* Radio buttons coloured to unit */
.options input[type="radio"] {
    accent-color: var(--unit-accent);
}

/* ── Submit / Reset Buttons ── */
.submit-btn {
    display: inline-flex !important;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--unit-accent), var(--unit-accent-dark)) !important;
    color: white !important;
    border: none !important;
    padding: 14px 28px !important;
    font-size: 1em !important;
    font-weight: 700 !important;
    font-family: 'Plus Jakarta Sans', sans-serif !important;
    border-radius: var(--radius-sm) !important;
    cursor: pointer;
    transition: all 0.2s ease !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15) !important;
    margin-top: 12px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.2) !important;
}

.submit-btn:disabled {
    background: #64748b !important;
    cursor: not-allowed;
    transform: none;
    box-shadow: none !important;
}

.reset-btn {
    background: rgba(100,116,139,0.12) !important;
    color: var(--text-mid) !important;
    border: 1px solid #cbd5e1 !important;
    padding: 12px 24px !important;
    font-size: 0.95em !important;
    font-weight: 600 !important;
    border-radius: var(--radius-sm) !important;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Plus Jakarta Sans', sans-serif !important;
}

.reset-btn:hover {
    background: rgba(100,116,139,0.18) !important;
    border-color: #64748b !important;
}

.back-to-hub-btn {
    background: linear-gradient(135deg, var(--blue-accent), var(--teal)) !important;
    color: white !important;
    border: none !important;
    padding: 12px 24px !important;
    font-size: 0.95em !important;
    font-weight: 600 !important;
    border-radius: var(--radius-sm) !important;
    cursor: pointer;
    text-decoration: none !important;
    display: inline-block;
    transition: all 0.2s ease;
    font-family: 'Plus Jakarta Sans', sans-serif !important;
    margin-left: 10px;
}

.back-to-hub-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(59,130,246,0.3);
}

/* ── Results Box ── */
.results,
#result-quiz1, #result-quiz2, #result-quiz3, #result-quiz4,
#result-quiz5, #result-quiz6, #result-quiz7, #result-quiz8,
#result-quiz9, #result-quiz10, #result-quiz11, #result-quiz12 {
    margin-top: 20px !important;
    padding: 24px !important;
    border-radius: var(--radius) !important;
    font-weight: 600;
    text-align: center;
    font-family: 'Plus Jakarta Sans', sans-serif;
}

.results.pass {
    background: #dcfce7 !important;
    color: #14532d !important;
    border: 2px solid var(--green) !important;
}

.results.fail {
    background: #fee2e2 !important;
    color: #7f1d1d !important;
    border: 2px solid var(--red) !important;
}

.score {
    font-family: 'Outfit', sans-serif !important;
    font-size: 2em !important;
    font-weight: 800 !important;
    margin: 8px 0;
}

/* ── Flag Buttons ── */
.flag-btn {
    background: transparent !important;
    color: #475569 !important;
    border: 1.5px solid #cbd5e1 !important;
    padding: 6px 12px !important;
    min-height: 32px;
    border-radius: 8px !important;
    cursor: pointer;
    font-size: 0.78em !important;
    font-weight: 600 !important;
    transition: all 0.18s ease;
    font-family: 'Plus Jakarta Sans', sans-serif;
}

.flag-btn:hover {
    border-color: #b45309 !important;
    color: #b45309 !important;
}

.flag-btn.flagged {
    background: #b45309 !important;
    border-color: #b45309 !important;
    color: white !important;
}

/* ── Floating Flagged Bar ── */
.floating-flagged-bar {
    position: fixed !important;
    bottom: 100px !important;
    right: 20px !important;
    z-index: 1000 !important;
    max-width: 400px !important;
    padding: 15px 20px !important;
    border-radius: var(--radius) !important;
    box-shadow: var(--shadow-md) !important;
    font-family: 'Plus Jakarta Sans', sans-serif;
    border: 2px solid #b45309 !important;
    background: #fffbeb !important;
}

.flagged-bar-title {
    font-family: 'Outfit', sans-serif !important;
    font-weight: 700 !important;
    color: var(--navy) !important;
    margin-bottom: 10px !important;
}

.flagged-questions-grid {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 5px !important;
}

.flagged-q-btn {
    border: none !important;
    padding: 8px 12px !important;
    border-radius: 8px !important;
    cursor: pointer !important;
    font-weight: 600 !important;
    color: white !important;
    font-family: 'Plus Jakarta Sans', sans-serif !important;
    transition: all 0.2s ease !important;
}

.flagged-q-btn:hover {
    opacity: 0.8 !important;
}

/* ── Unanswered Question Bounce ── */
@keyframes unansweredBounce {
    0%   { transform: translateX(0); box-shadow: 0 0 0 0 rgba(239,68,68,0.4); }
    10%  { transform: translateX(-8px); }
    20%  { transform: translateX(8px); }
    30%  { transform: translateX(-6px); }
    40%  { transform: translateX(6px); }
    50%  { transform: translateX(-3px); }
    60%  { transform: translateX(3px); }
    70%  { transform: translateX(0); }
    100% { transform: translateX(0); box-shadow: 0 0 0 0 rgba(239,68,68,0); }
}

.question.unanswered-bounce {
    animation: unansweredBounce 0.6s ease-out !important;
    border: 3px solid var(--red) !important;
    border-radius: var(--radius) !important;
    background: rgba(239,68,68,0.04) !important;
}

/* ── Footer ── */
footer {
    background: var(--navy-dark) !important;
    color: rgba(255,255,255,0.5) !important;
    text-align: center;
    padding: 24px !important;
    font-size: 0.85em;
    position: relative;
    z-index: 1;
}

/* ── Unit Icon Badge (injected by JS) ── */
.quiz-unit-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--unit-accent), var(--unit-accent-dark));
    border-radius: 10px;
    font-size: 20px;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

/* ══════════════════════════════════════════════════════
   UNIT PAGE STYLES (loaded on unit pages via same file)
   ══════════════════════════════════════════════════════ */

/* ── Passed Lesson Cards (green tint + border) ── */
.lesson-card.lesson-card-passed {
    border-left: 5px solid var(--green, #16a34a) !important;
    background: linear-gradient(135deg, rgba(22,163,74,0.06), rgba(255,255,255,0.95)) !important;
    box-shadow: 0 2px 12px rgba(22,163,74,0.10), 0 1px 3px rgba(0,0,0,0.06) !important;
}

.lesson-card.lesson-card-passed::after {
    content: '✓ Passed';
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--green, #16a34a);
    color: white;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 0.75em;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
    letter-spacing: 0.3px;
}

/* Ensure lesson-card is positioned for the badge */
.lesson-card {
    position: relative !important;
}

/* Failed lesson cards (red tint) */
.lesson-card.lesson-card-failed {
    border-left: 5px solid var(--red, #ef4444) !important;
    background: linear-gradient(135deg, rgba(239,68,68,0.04), rgba(255,255,255,0.95)) !important;
}

.lesson-card.lesson-card-failed::after {
    content: '✗ Not yet passed';
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--red, #ef4444);
    color: white;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 0.75em;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
    letter-spacing: 0.3px;
}

/* ── Back to Top Button ── */
.unit-nav-btt {
    position: fixed;
    bottom: 28px;
    left: 28px;
    z-index: 200;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, #1a2744, #243556);
    color: white;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 0.72em;
    font-weight: 700;
    letter-spacing: 0.3px;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(26, 39, 68, 0.35);
    transition: opacity 0.3s ease, transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.unit-nav-btt:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 24px rgba(26, 39, 68, 0.5);
}

/* ── Next Quiz Bar ── */
.unit-nav-next-quiz {
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    padding: 16px 24px;
    margin-bottom: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.10);
    border: 2px solid var(--unit-accent, #3b82f6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    animation: quizSlideDown 0.5s ease-out;
}

.unq-label {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 0.92em;
    color: #475569;
    flex: 1;
    min-width: 0;
}

.unq-label strong {
    color: #1e293b;
    font-weight: 700;
}

.unq-buttons {
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}

.unq-scroll-btn {
    background: rgba(100, 116, 139, 0.12);
    color: #475569;
    border: 1.5px solid #cbd5e1;
    padding: 10px 18px;
    font-size: 0.88em;
    font-weight: 600;
    font-family: 'Plus Jakarta Sans', sans-serif;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.unq-scroll-btn:hover {
    background: rgba(100, 116, 139, 0.2);
    border-color: #64748b;
}

.unq-go-btn {
    background: linear-gradient(135deg, var(--unit-accent, #3b82f6), var(--unit-accent-dark, #1e40af));
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 0.88em;
    font-weight: 700;
    font-family: 'Plus Jakarta Sans', sans-serif;
    border-radius: 10px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
    display: inline-flex;
    align-items: center;
}

.unq-go-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 16px rgba(0, 0, 0, 0.2);
}

/* ── Responsive ── */
@media (max-width: 640px) {
    header { height: 60px !important; padding: 0 16px !important; }
    header h1 { font-size: 1.3em !important; }
    header p.tagline { display: none; }
    main, main.container { padding: 16px 14px 60px !important; }
    .module-header, .test-container > .test-header { padding: 20px !important; }
    .question, .lesson-section { padding: 18px 20px !important; }
    .options li, .options label { padding: 12px 14px !important; }
    .quiz-progress-tracker { top: 68px; }

    /* Unit-nav responsive */
    .unit-nav-btt { bottom: 20px; left: 20px; width: 48px; height: 48px; font-size: 0.65em; }
    .unit-nav-next-quiz { padding: 14px 18px; flex-direction: column; align-items: stretch; gap: 12px; }
    .unq-buttons { justify-content: stretch; }
    .unq-scroll-btn, .unq-go-btn { flex: 1; text-align: center; justify-content: center; }
    .lesson-card.lesson-card-passed::after,
    .lesson-card.lesson-card-failed::after { font-size: 0.65em; top: 10px; right: 10px; padding: 3px 8px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}