/* ═══════════════════════════════════════════════════════════════════
   Question Detail Page — /question/:slug
   SEO-indexed exam question pages with content gating
   ═══════════════════════════════════════════════════════════════════ */

.qd-page {
    animation: qd-fade-in 0.35s ease;
}

@keyframes qd-fade-in {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Breadcrumb ── */
.qd-breadcrumb {
    margin-bottom: 1.5rem;
}

.qd-breadcrumb a {
    color: var(--primary-color, #4facfe);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: opacity 0.2s;
}

.qd-breadcrumb a:hover {
    opacity: 0.75;
    text-decoration: underline;
}

/* ── Badges ── */
.qd-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.qd-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.3rem 0.85rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    border: 1px solid transparent;
}

.qd-badge--class {
    background: rgba(79, 172, 254, 0.12);
    color: var(--primary-color, #4facfe);
    border-color: rgba(79, 172, 254, 0.25);
}

.qd-badge--subject {
    background: rgba(100, 200, 130, 0.12);
    color: #4ade80;
    border-color: rgba(100, 200, 130, 0.25);
}

.qd-badge--period {
    background: rgba(250, 200, 80, 0.12);
    color: #fbbf24;
    border-color: rgba(250, 200, 80, 0.25);
}

/* ── Question Card ── */
.qd-question-card {
    background: var(--surface-color, #1e2030);
    border: 1px solid var(--border-color, rgba(255,255,255,0.08));
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 1.75rem;
    position: relative;
    overflow: hidden;
}

.qd-question-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color, #4facfe), #a78bfa, #34d399);
    border-radius: 16px 16px 0 0;
}

.qd-question-title {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--primary-color, #4facfe);
    margin: 0 0 1rem 0;
    opacity: 0.8;
}

.qd-question-body {
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--text-primary, #e8eaf0);
}

.qd-images {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.qd-image {
    max-width: 100%;
    max-height: 320px;
    border-radius: 10px;
    border: 1px solid var(--border-color, rgba(255,255,255,0.1));
    cursor: zoom-in;
    transition: opacity 0.2s;
}

.qd-image:hover { opacity: 0.88; }

/* ── Answer Section ── */
.qd-answer-section {
    background: var(--surface-color, #1e2030);
    border: 1px solid var(--border-color, rgba(255,255,255,0.08));
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 1.75rem;
}

.qd-answer-heading {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary, #e8eaf0);
    margin: 0 0 1.25rem 0;
}

.qd-answer-heading svg {
    color: var(--primary-color, #4facfe);
    flex-shrink: 0;
}

/* Full answer */
.qd-answer-full {
    font-size: 0.96rem;
    line-height: 1.75;
    color: var(--text-primary, #e8eaf0);
}

/* Gated answer */
.qd-answer-preview-wrap {
    position: relative;
}

.qd-answer-preview {
    font-size: 0.96rem;
    line-height: 1.75;
    color: var(--text-primary, #e8eaf0);
    max-height: 12rem;
    overflow: hidden;
}

.qd-answer-gradient {
    position: relative;
    height: 5rem;
    margin-top: -5rem;
    background: linear-gradient(to bottom, transparent, var(--surface-color, #1e2030));
    pointer-events: none;
}

/* ── Upgrade Gate ── */
.qd-upgrade-gate {
    text-align: center;
    padding: 2.5rem 1.5rem 1rem;
    margin-top: 0.5rem;
}

.qd-gate-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    filter: drop-shadow(0 0 18px rgba(167, 139, 250, 0.4));
}

.qd-gate-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary, #e8eaf0);
    margin: 0 0 0.65rem 0;
}

.qd-gate-desc {
    color: var(--text-secondary, #9aa5b4);
    font-size: 0.9rem;
    line-height: 1.6;
    max-width: 520px;
    margin: 0 auto 1.75rem;
}

.qd-gate-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.qd-gate-btn {
    padding: 0.7rem 2rem;
    font-size: 0.97rem;
    font-weight: 700;
    border-radius: 999px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: transform 0.18s, box-shadow 0.18s;
    background: linear-gradient(135deg, var(--primary-color, #4facfe), #a78bfa);
    color: #fff;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 18px rgba(79, 172, 254, 0.3);
}

.qd-gate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(79, 172, 254, 0.45);
}

.qd-gate-btn-sec {
    padding: 0.65rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 999px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: transparent;
    color: var(--text-secondary, #9aa5b4);
    border: 1px solid var(--border-color, rgba(255,255,255,0.15));
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
}

.qd-gate-btn-sec:hover {
    color: var(--text-primary, #e8eaf0);
    border-color: var(--primary-color, #4facfe);
}

/* ── No Answer ── */
.qd-no-answer {
    color: var(--text-secondary, #9aa5b4);
    font-style: italic;
    font-size: 0.9rem;
}

.qd-no-answer a {
    color: var(--primary-color, #4facfe);
}

/* ── Back link ── */
.qd-back {
    margin-top: 1rem;
}

/* ── Mobile ── */
@media (max-width: 600px) {
    .qd-question-card,
    .qd-answer-section {
        padding: 1.25rem;
        border-radius: 12px;
    }

    .qd-question-body {
        font-size: 0.97rem;
    }

    .qd-gate-title {
        font-size: 1.05rem;
    }

    .qd-gate-desc {
        font-size: 0.85rem;
    }

    .qd-gate-btn,
    .qd-gate-btn-sec {
        width: 100%;
        justify-content: center;
    }
}