/* ═══════════════════════════════════════════════════
   nexus-host.css  —  Quiz picker, mode cards, create
   ═══════════════════════════════════════════════════ */

/* ── Quiz picker row (list + preview side-by-side) ── */
.quiz-picker-row {
    display: grid;
    grid-template-columns: 1fr 220px;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: start;
}

.quiz-list-box {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(99,102,241,0.2);
    border-radius: 12px;
    overflow-y: auto;
    max-height: 200px;
}
.quiz-list-box::-webkit-scrollbar       { width: 4px; }
.quiz-list-box::-webkit-scrollbar-thumb { background: rgba(99,102,241,0.4); border-radius: 4px; }

.quiz-list-item {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.6rem 0.85rem;
    cursor: pointer;
    border-bottom: 1px solid rgba(255,255,255,0.04);
    transition: background 0.15s;
}
.quiz-list-item:last-child    { border-bottom: none; }
.quiz-list-item:hover         { background: rgba(99,102,241,0.1); }
.quiz-list-item.selected      { background: rgba(99,102,241,0.18); }

.quiz-list-thumb {
    width: 36px; height: 36px;
    border-radius: 7px;
    object-fit: cover;
    flex-shrink: 0;
    background: rgba(99,102,241,0.15);
}
.quiz-list-thumb-placeholder {
    width: 36px; height: 36px;
    border-radius: 7px;
    background: rgba(99,102,241,0.12);
    display: flex; align-items: center; justify-content: center;
    color: #6366f1; font-size: 0.9rem; flex-shrink: 0;
}
.quiz-list-name { font-size: 0.9rem; font-weight: 600; color: #e6eef8; line-height: 1.2; }
.quiz-list-meta { font-size: 0.75rem; color: #64748b; }

/* ── Quiz preview card ── */
.quiz-preview-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(99,102,241,0.2);
    border-radius: 12px;
    overflow: hidden;
    height: 200px;
    display: flex;
    flex-direction: column;
}
.quiz-preview-card.empty {
    align-items: center; justify-content: center;
    color: #4b5563; font-size: 0.9rem; text-align: center; gap: 0.4rem;
}
.quiz-preview-card.empty i { font-size: 1.6rem; opacity: 0.4; }

.quiz-preview-img {
    width: 100%; height: 110px;
    object-fit: cover; background: rgba(99,102,241,0.1); flex-shrink: 0;
}
.quiz-preview-img-placeholder {
    width: 100%; height: 110px;
    background: rgba(99,102,241,0.1);
    display: flex; align-items: center; justify-content: center;
    color: #6366f1; font-size: 2rem; flex-shrink: 0;
}
.quiz-preview-info  { padding: 0.65rem 0.8rem; flex: 1; }
.quiz-preview-title {
    font-size: 0.88rem; font-weight: 700; color: #e6eef8;
    margin-bottom: 0.25rem; line-height: 1.2;
    display: -webkit-box; -webkit-line-clamp: 2;
    -webkit-box-orient: vertical; overflow: hidden;
}
.quiz-preview-meta  { font-size: 0.75rem; color: #64748b; }

/* ── Loading spinner ── */
.quiz-loading {
    display: flex; align-items: center; justify-content: center;
    gap: 0.5rem; padding: 2rem 1rem; color: #4b5563; font-size: 0.9rem;
}
.quiz-loading i { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Mode cards ── */
.mode-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.75rem;
}

.mode-card {
    background: rgba(255,255,255,0.04);
    border: 1.5px solid rgba(99,102,241,0.2);
    border-radius: 14px;
    padding: 1rem;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
}
.mode-card:hover {
    background: rgba(99,102,241,0.1);
    border-color: rgba(99,102,241,0.45);
    transform: translateY(-2px);
}
.mode-card.selected {
    background: rgba(99,102,241,0.18);
    border-color: #818cf8;
    box-shadow: 0 0 0 2px rgba(129,140,248,0.25);
}
.mode-card-icon  { font-size: 1.6rem; margin-bottom: 0.4rem; color: #818cf8; }
.mode-card-name  { font-size: 0.95rem; font-weight: 700; color: #e6eef8; margin-bottom: 0.15rem; }
.mode-card-desc  { font-size: 0.75rem; color: #64748b; }

/* ── Create Room button + validation ── */
.create-confirm-btn { width: 100%; padding: 1rem; font-size: 1.05rem; }
.create-confirm-btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none !important; }

.validation-hint {
    text-align: center;
    font-size: 0.8rem;
    color: #ec4899;
    margin-top: 0.5rem;
    min-height: 1.2em;
}

/* ── Mobile overrides (quiz + mode sections) ── */
@media (max-width: 600px) {
    .quiz-picker-row    { grid-template-columns: 1fr; gap: 0.6rem; margin-bottom: 1rem; }
    .quiz-preview-card  { display: none !important; }
    .quiz-list-box      { max-height: 150px; }
    .mode-cards         { gap: 0.5rem; margin-bottom: 1.25rem; }
    .mode-card          { padding: 0.65rem 0.4rem; }
    .mode-card-icon     { font-size: 1.2rem; margin-bottom: 0.2rem; }
    .mode-card-name     { font-size: 0.8rem; }
    .mode-card-desc     { display: none; }
    .create-confirm-btn { padding: 0.85rem; font-size: 0.95rem; }
    .validation-hint    { font-size: 0.75rem; }
}