/* MCQ Quiz CSS - set.css */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #0a0a0f;
    --bg2: #0f0f1a;
    --bg3: #13131f;
    --border: rgba(255, 255, 255, 0.08);
    --yellow: #f7df1e;
    --yellow-dim: rgba(247, 223, 30, 0.12);
    --green: #22c55e;
    --green-dim: rgba(34, 197, 94, 0.12);
    --red: #ef4444;
    --red-dim: rgba(239, 68, 68, 0.12);
    --text: #e2e8f0;
    --text-2: #94a3b8;
    --text-3: #64748b;
}

:root.light-theme {
    --bg: #ffffff;
    --bg2: #f8fafc;
    --bg3: #f0f4f8;
    --border: rgba(0, 0, 0, 0.08);
    --yellow: #f39c12;
    --yellow-dim: rgba(243, 156, 18, 0.15);
    --green: #27ae60;
    --green-dim: rgba(39, 174, 96, 0.15);
    --red: #e74c3c;
    --red-dim: rgba(231, 76, 60, 0.15);
    --text: #1a1a1a;
    --text-2: #4a5568;
    --text-3: #718096;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background 0.4s, color 0.4s;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 0;
    background: radial-gradient(ellipse 55% 45% at 15% 15%, rgba(247, 223, 30, 0.06) 0%, transparent 70%), radial-gradient(ellipse 45% 55% at 85% 85%, rgba(34, 197, 94, 0.06) 0%, transparent 70%);
    pointer-events: none;
    animation: bg-pulse 8s ease-in-out infinite alternate;
}

@keyframes bg-pulse {
    from { opacity: 0.8; }
    to { opacity: 1.2; }
}

a { text-decoration: none; color: inherit; }

/* ── NAVBAR ── */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    animation: slideDown 0.5s ease;
}

@keyframes slideDown {
    from { transform: translateY(-100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.nav-inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    height: 60px;
    gap: 14px;
}

.logo {
    font-family: 'Fira Code', monospace;
    background: var(--yellow);
    color: #111;
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
    transition: transform 0.2s, box-shadow 0.2s;
}

.logo:hover {
    transform: rotate(-5deg) scale(1.1);
    box-shadow: 0 0 16px rgba(247, 223, 30, 0.5);
}

.nav-title {
    font-weight: 700;
    font-size: 0.95rem;
}

.back-link {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-2);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.25s;
    white-space: nowrap;
}

.back-link:hover {
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.18);
    transform: translateX(-3px);
}

/* ── QUIZ WRAPPER ── */
.quiz-wrapper {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px 80px;
    min-height: calc(100vh - 60px);
}

.quiz-container {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

/* ── PROGRESS BAR ── */
.progress-section {
    animation: fadeUp 0.5s ease 0.1s both;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-2);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--green), var(--yellow));
    border-radius: 999px;
    width: 2%;
    transition: width 0.3s ease;
}

/* ── QUESTION CARD ── */
.question-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 36px 32px;
    position: relative;
    animation: fadeUp 0.5s ease 0.2s both;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.question-card:hover {
    border-color: rgba(247, 223, 30, 0.15);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.question-badge {
    display: inline-block;
    background: var(--yellow-dim);
    color: var(--yellow);
    padding: 4px 12px;
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.question-text {
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1.6;
    margin-bottom: 28px;
    color: var(--text);
}

/* ── OPTIONS GRID ── */
.options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 24px;
}

.option {
    padding: 14px 18px;
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.25s;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
}

.option::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.04), transparent);
    transform: translateX(-100%);
    transition: transform 0.4s;
    pointer-events: none;
}

.option:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateX(4px);
}

.option:hover::before {
    transform: translateX(100%);
}

.option-label {
    font-weight: 600;
    min-width: 24px;
    color: var(--text-2);
}

.option.selected {
    border-color: rgba(247, 223, 30, 0.4);
    background: var(--yellow-dim);
    box-shadow: inset 0 0 12px rgba(247, 223, 30, 0.08);
}

.option.selected .option-label {
    color: var(--yellow);
    font-weight: 700;
}

.option.correct {
    border-color: rgba(34, 197, 94, 0.4) !important;
    background: var(--green-dim) !important;
}

.option.correct .option-label {
    color: var(--green) !important;
}

.option.correct::after {
    content: '✓';
    position: absolute;
    right: 16px;
    color: var(--green);
    font-weight: 700;
    font-size: 1.1rem;
}

.option.incorrect {
    border-color: rgba(239, 68, 68, 0.4) !important;
    background: var(--red-dim) !important;
}

.option.incorrect .option-label {
    color: var(--red) !important;
}

.option.incorrect::after {
    content: '✗';
    position: absolute;
    right: 16px;
    color: var(--red);
    font-weight: 700;
    font-size: 1.1rem;
}

/* ── RESULT MESSAGE ── */
.result-message {
    padding: 14px 16px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: 16px;
    animation: slideUp 0.3s ease;
    display: none;
}

.result-message.show {
    display: block;
}

.result-message.correct {
    background: var(--green-dim);
    color: var(--green);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.result-message.incorrect {
    background: var(--red-dim);
    color: var(--red);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── BUTTONS ── */
.nav-buttons {
    display: flex;
    gap: 12px;
    justify-content: space-between;
    animation: fadeUp 0.5s ease 0.3s both;
}

.btn {
    padding: 12px 20px;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.4s;
    pointer-events: none;
}

.btn:hover::before {
    transform: translateX(100%);
}

.btn-primary {
    background: var(--yellow-dim);
    color: var(--yellow);
    border-color: rgba(247, 223, 30, 0.3);
}

.btn-primary:hover:not(:disabled) {
    background: var(--yellow-dim);
    border-color: rgba(247, 223, 30, 0.5);
    box-shadow: 0 4px 16px rgba(247, 223, 30, 0.15);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--text-2);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--text);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-large {
    padding: 14px 28px;
    font-size: 1rem;
    width: 100%;
    margin-top: 16px;
}

/* ── QUIZ COMPLETE ── */
.quiz-complete {
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 15, 0.95);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    animation: fadeIn 0.3s ease;
}

.quiz-complete.hidden {
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.complete-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 32px;
    max-width: 420px;
    text-align: center;
    animation: scaleIn 0.3s ease;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.complete-icon {
    font-size: 3.5rem;
    margin-bottom: 16px;
    animation: bounce 0.6s ease;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.complete-card h2 {
    font-size: 1.8rem;
    margin-bottom: 24px;
    font-weight: 800;
}

.score-display {
    margin-bottom: 12px;
}

.score-value {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--yellow);
    font-family: 'Fira Code', monospace;
}

.score-label {
    font-size: 0.9rem;
    color: var(--text-3);
    margin-top: 4px;
}

.score-percent {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--green);
    margin-bottom: 24px;
}

.score-breakdown {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.breakdown-item {
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.breakdown-label {
    font-size: 0.75rem;
    color: var(--text-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.breakdown-value {
    font-size: 1.4rem;
    font-weight: 800;
    font-family: 'Fira Code', monospace;
}

.breakdown-value.correct { color: var(--green); }
.breakdown-value.incorrect { color: var(--red); }
.breakdown-value.skipped { color: var(--text-2); }

/* ── FOOTER ── */
.page-footer {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--border);
    padding: 24px;
    margin-top: 80px;
}

.footer-inner {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-3);
    flex-wrap: wrap;
}

.footer-link {
    margin-left: auto;
    color: var(--text-2);
    font-size: 0.82rem;
    font-weight: 500;
    padding: 5px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: all 0.25s;
}

.footer-link:hover {
    color: var(--text);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateX(-3px);
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
    .quiz-wrapper {
        padding: 24px 16px 60px;
    }

    .question-card {
        padding: 24px 18px;
    }

    .question-text {
        font-size: 1.1rem;
    }

    .nav-buttons {
        flex-direction: column;
        gap: 10px;
    }

    .btn {
        width: 100%;
    }

    .complete-card {
        margin: 16px;
        max-width: calc(100% - 32px);
    }
}