/* ==========================================================
   SQLISM — INTERVIEW HUB
   Topic cards + full question index. Layers on top of
   interview.css (reuses .hero, .container, tokens).
   ========================================================== */

.ih-topics,
.ih-index,
.ih-topics *,
.ih-index * { box-sizing: border-box; }

/* ---------- TOPIC CARDS ---------- */
.ih-topics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
    margin: 2rem 0 3rem;
}

.ih-card {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 24px;
    border-radius: 18px;
    text-decoration: none;
    color: var(--text-primary);
    background: var(--card-bg, #fff);
    border: 1px solid var(--border, #e2e8f0);
    box-shadow: 0 2px 12px -8px rgba(15, 23, 42, 0.18);
    transition: transform .2s cubic-bezier(.34,1.4,.64,1), box-shadow .25s ease, border-color .25s ease;
}
.ih-card:hover {
    transform: translateY(-4px);
    border-color: rgba(139, 92, 246, 0.5);
    box-shadow: 0 18px 40px -20px rgba(139, 92, 246, 0.55);
}

.ih-card__icon {
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    font-size: 16px;
    color: #fff;
    background: linear-gradient(135deg, #8b5cf6, #10b981);
    box-shadow: 0 8px 18px -8px rgba(139, 92, 246, 0.55);
}

.ih-card__body { display: flex; flex-direction: column; gap: 5px; flex: 1; }
.ih-card__body strong {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.3;
}
.ih-card__desc {
    font-size: 13.5px;
    line-height: 1.55;
    color: var(--text-secondary, #475569);
    font-weight: 400;
}

.ih-card__foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding-top: 12px;
    border-top: 1px solid var(--border, #e2e8f0);
}
.ih-card__count {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}
.ih-card__go {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12.5px;
    font-weight: 700;
    color: #fff;
    background: #111827;
    padding: 8px 14px;
    border-radius: 10px;
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.ih-card__go i { font-size: 10.5px; transition: transform .2s ease; }
.ih-card:hover .ih-card__go {
    background: #000;
    box-shadow: 0 10px 22px -8px rgba(0, 0, 0, 0.5);
}
.ih-card:hover .ih-card__go i { transform: translateX(3px); }

[data-theme="dark"] .ih-card__go { background: #f9fafb; color: #111827; }
[data-theme="dark"] .ih-card:hover .ih-card__go {
    background: #fff;
    box-shadow: 0 10px 22px -8px rgba(0, 0, 0, 0.7);
}

/* ---------- FULL QUESTION INDEX ---------- */
.ih-index { margin-bottom: 3.5rem; }
.ih-index > h2 {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin: 0 0 4px;
    color: var(--text-primary);
}
.ih-index__lead {
    font-size: 14.5px;
    color: var(--text-secondary, #475569);
    margin: 0 0 24px;
}

.ih-group { margin-bottom: 26px; }
.ih-group__title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0 0 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border, #e2e8f0);
}
.ih-group__title i { color: #8b5cf6; font-size: 14px; }
.ih-group__title a { color: var(--text-primary); text-decoration: none; }
.ih-group__title a:hover { color: #8b5cf6; }
.ih-group__count {
    margin-left: auto;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary, #475569);
    background: var(--bg-secondary, #f1f5f9);
    border-radius: 999px;
    padding: 2px 10px;
}

.ih-qlist { list-style: none; margin: 0; padding: 0; }
.ih-qlist li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 4px;
    border-bottom: 1px solid var(--border, #eef2f7);
}
.ih-qlist li:last-child { border-bottom: none; }
.ih-qlist a {
    flex: 1;
    min-width: 0;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    transition: color .2s ease;
}
.ih-qlist a:hover { color: #8b5cf6; text-decoration: underline; }

.ih-diff {
    flex-shrink: 0;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 999px;
    text-transform: capitalize;
}
.ih-diff--beginner     { color: #047857; background: rgba(16, 185, 129, 0.14); }
.ih-diff--intermediate { color: #2563eb; background: rgba(59, 130, 246, 0.14); }
.ih-diff--advanced     { color: #b45309; background: rgba(245, 158, 11, 0.16); }
.ih-diff--expert       { color: #b91c1c; background: rgba(239, 68, 68, 0.14); }

/* ---------- DARK THEME ---------- */
[data-theme="dark"] .ih-card {
    background: var(--card-bg, #1e293b);
    border-color: var(--border, #334155);
}
[data-theme="dark"] .ih-diff--beginner     { color: #6ee7b7; }
[data-theme="dark"] .ih-diff--intermediate { color: #93c5fd; }
[data-theme="dark"] .ih-diff--advanced     { color: #fcd34d; }
[data-theme="dark"] .ih-diff--expert       { color: #fca5a5; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 640px) {
    .ih-topics { grid-template-columns: 1fr; gap: 14px; }
    .ih-qlist li { flex-wrap: wrap; gap: 6px; }
    .ih-diff { order: 2; }
}