/* ========================================
   Responsive Breakpoints
   ======================================== */

@media (max-width: 1024px) {
    .tabs {
        position: static;
        transform: none;
        order: 3;
        width: 100%;
        margin-top: 0.5rem;
    }

    .header-actions {
        order: 2;
    }

    h1 {
        order: 1;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 0.5rem;
    }

    h1 {
        font-size: 1.25rem;
        margin: 0;
    }

    .header-actions {
        gap: 0.5rem;
    }

    .tabs {
        overflow-x: auto;
        white-space: nowrap;
        padding: 0 0 0.5rem 0;
        margin-bottom: 0.5rem;
        -webkit-overflow-scrolling: touch;
        justify-content: flex-start;
        border-bottom: 2px solid var(--border-color);
    }

    .tab-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
        flex: 0 0 auto;
    }

    .toolbar .controls {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
        align-items: center;
    }

    .control-group:nth-child(1),
    .control-group:nth-child(2) {
        grid-column: span 2;
    }

    .control-group {
        display: flex;
        flex-direction: column;
        width: 100%;
    }

    .control-group.stats {
        grid-column: span 2;
        flex-direction: row;
        justify-content: space-around;
        background: var(--bg-secondary);
        padding: 0.5rem;
        border-radius: 4px;
        font-size: 0.8rem;
        margin: 0;
    }

    .control-group:last-child {
        grid-column: span 2;
        flex-direction: row;
        gap: 0.5rem;
    }

    main .btn {
        flex: 1;
        min-height: 40px;
        font-size: 0.9rem;
        padding: 0.5rem;
    }

    input[type="range"] {
        height: 6px;
        margin: 12px 0;
        width: 100%;
    }

    input[type="range"]::-webkit-slider-thumb {
        width: 20px;
        height: 20px;
        margin-top: -7px;
    }

    #visualizer-container {
        padding: 0.5rem;
        flex-grow: 1;
        min-height: 60vh;
        /* Fix #2: add bottom padding so scrubber doesn't overlap bars */
        padding-bottom: 5rem;
    }

    .separator {
        display: none;
    }

    .keyboard-hints {
        display: none;
    }

    /* Fix #2: make scrubber sit cleanly above bottom edge on mobile */
    #main-scrubber-wrap {
        left: 0.5rem;
        right: 0.5rem;
        bottom: 0.75rem;
    }

    .advanced-options {
        margin-top: 0.5rem;
    }
}

@media (min-width: 768px) and (max-width: 1024px) {
    .toolbar .controls {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 1rem;
    }

    .separator {
        display: none;
    }

    #visualizer-container {
        padding: 2rem 2rem 0;
        min-height: 400px;
    }
}

@media (max-width: 480px) {
    main {
        padding: 0.5rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    .checkbox-grid {
        grid-template-columns: 1fr;
    }

    .control-group {
        width: 100%;
    }

    .control-group label {
        font-size: 0.8rem;
    }

    .benchmark-config,
    .algo-selection,
    .table-controls {
        padding: 0.75rem;
    }

    .compare-grid {
        grid-template-columns: 1fr;
    }

    .analytics-grid {
        grid-template-columns: 1fr;
    }

    .compare-controls {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .compare-config {
        flex-direction: column;
        gap: 0.75rem;
        width: 100%;
    }

    .compare-actions {
        flex-wrap: wrap;
        justify-content: center;
        width: 100%;
    }

    .compare-actions .btn {
        flex: 1;
        min-width: 80px;
    }

    .compare-panel {
        height: 230px;
        padding: 0.75rem;
    }

    .compare-visualizer {
        min-height: 0;
    }

    .panel-header {
        gap: 0.25rem;
    }

    .algo-select {
        font-size: 0.8rem;
        padding: 0.3rem;
    }

    .panel-stats {
        font-size: 0.65rem;
    }

    .race-timer {
        font-size: 1rem;
        padding: 0.3rem 0.75rem;
    }

    .leaderboard {
        padding: 1rem;
    }

    .leaderboard-item {
        padding: 0.5rem 0.75rem;
        gap: 0.5rem;
    }
}