/* ═══════════════════════════════════════
   BitCoin del Saber v4.0 — Responsive
   ═══════════════════════════════════════ */

/* ── Mobile: Side panel becomes bottom drawer ── */
@media (max-width: 768px) {
    .main-layout {
        flex-direction: column;
    }
    .play-zone {
        padding: 0.5rem;
        flex-shrink: 0;
    }
    .brain-img {
        width: 100px;
        height: 100px;
    }
    .brain-container {
        margin-bottom: 0.5rem;
    }
    .trivia-zone {
        max-width: 100%;
    }
    .trivia-options {
        grid-template-columns: 1fr;
    }
    .trivia-question {
        font-size: 1rem;
    }
    .side-panel {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--border-color);
        flex: 1;
        min-height: 0;
    }
    .tab-nav {
        padding: 0.3rem;
        gap: 0.15rem;
    }
    .tab-btn {
        font-size: 0.95rem;
        padding: 0.35rem 0.4rem;
    }
    .tab-panels {
        padding: 0.5rem;
    }
    .hud {
        padding: 0.4rem 0.75rem;
    }
    .hud-value {
        font-size: 1.4rem;
    }
    .hud-secondary {
        gap: 0.4rem;
    }
    .hud-badge {
        font-size: 0.65rem;
        padding: 0.1rem 0.4rem;
    }
    .trivia-start-btn {
        font-size: 1rem;
        padding: 0.75rem 1rem;
    }
    .gen-row, .upgrade-row, .mission-row, .boost-row, .prestige-upgrade {
        padding: 0.5rem;
    }
    .gen-name, .upgrade-name, .boost-name {
        font-size: 0.8rem;
    }
    .notifications {
        top: auto;
        bottom: 1rem;
        right: 0.5rem;
        left: 0.5rem;
    }
    .notification {
        max-width: 100%;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.4rem;
    }
    .modal {
        max-width: 95%;
        padding: 1.5rem;
    }
    .rb-arena {
        height: 200px;
    }
}

/* ── Very small screens ── */
@media (max-width: 380px) {
    .hud-value {
        font-size: 1.2rem;
    }
    .trivia-option {
        padding: 0.5rem;
        font-size: 0.8rem;
    }
    .opt-letter {
        width: 24px;
        height: 24px;
        font-size: 0.75rem;
    }
    .title-name {
        font-size: 1.8rem;
    }
    .btn-play {
        font-size: 1.1rem;
        padding: 0.75rem 2rem;
    }
}

/* ── Large screens ── */
@media (min-width: 1200px) {
    .side-panel {
        width: 420px;
    }
    .trivia-zone {
        max-width: 550px;
    }
    .brain-img {
        width: 160px;
        height: 160px;
    }
}