:root {
    --bg: #1a1a2e;
    --surface: #16213e;
    --accent: #0f4c75;
    --high: #3282b8;
    --low: #e94560;
    --text: #e8e8e8;
    --text-secondary: #a0a0a0;
    --grid-dot: rgba(48, 130, 184, 0.1);
    --border: #2d3e50;
    --shadow: rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow: hidden;
    height: 100vh;
    display: flex;
    flex-direction: column;
    touch-action: none;
}

#toolbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    box-shadow: 0 2px 8px var(--shadow);
}

#toolbar h1 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--text);
    margin: 0;
}

@media (max-width: 768px) {
    #toolbar {
        padding: 12px 16px;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    #toolbar h1 {
        font-size: 16px;
        width: 100%;
    }
    
    .toolbar-buttons {
        width: 100%;
        justify-content: space-between;
    }
    
    .toolbar-buttons button {
        padding: 8px 12px;
        font-size: 12px;
        flex: 1;
    }
}

.toolbar-buttons {
    display: flex;
    gap: 12px;
}

.toolbar-buttons button {
    background: var(--accent);
    color: white;
    border: none;
    padding: 10px 20px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px var(--shadow);
}

.toolbar-buttons button:hover {
    background: var(--high);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px var(--shadow);
}

.toolbar-buttons button:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px var(--shadow);
}

#main-layout {
    display: grid;
    grid-template-columns: 200px 1fr 300px;
    flex: 1;
    overflow: hidden;
}

@media (max-width: 1024px) {
    #main-layout {
        grid-template-columns: 180px 1fr 250px;
    }
}

@media (max-width: 768px) {
    #main-layout {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
    }
    
    #sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 12px;
        max-height: 120px;
        overflow-x: auto;
        overflow-y: hidden;
    }
    
    #gate-palette {
        flex-direction: row;
        gap: 8px;
        overflow-x: auto;
        padding-bottom: 8px;
    }
    
    .palette-chip {
        min-width: 70px;
        flex-shrink: 0;
    }
    
    #truth-panel {
        border-left: none;
        border-top: 1px solid var(--border);
        max-height: 250px;
        padding: 12px;
    }
    
    #sidebar h2,
    #truth-panel h2 {
        font-size: 11px;
        margin-bottom: 8px;
    }
}

#sidebar {
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 24px 16px;
    overflow-y: auto;
}

#sidebar h2 {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

#gate-palette {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.palette-chip {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: grab;
    transition: all 0.2s ease;
}

.palette-chip:hover {
    border-color: var(--high);
    background: rgba(48, 130, 184, 0.1);
    transform: translateX(3px);
    box-shadow: 0 2px 8px var(--shadow);
}

.palette-chip:active {
    cursor: grabbing;
}

.palette-chip span {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.3px;
    color: var(--text-secondary);
}

#canvas-container {
    position: relative;
    background: var(--bg);
    background-image: radial-gradient(circle, var(--grid-dot) 1px, transparent 1px);
    background-size: 20px 20px;
    overflow: hidden;
}

#svg-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

#svg-layer path {
    pointer-events: stroke;
}

#gates-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#truth-panel {
    background: var(--surface);
    border-left: 1px solid var(--border);
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#truth-panel h2 {
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.truth-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 15px;
}

.truth-controls button {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 10px;
    font-family: inherit;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.truth-controls button:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: 0 2px 4px var(--shadow);
}

#truth-table-container {
    flex: 1;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
}

#status-bar {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 12px 24px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    z-index: 100;
    box-shadow: 0 -2px 8px var(--shadow);
}

@media (max-width: 768px) {
    #status-bar {
        padding: 8px 12px;
        font-size: 11px;
    }
    
    #status-outputs {
        flex-wrap: wrap;
        gap: 8px;
    }
}

#status-outputs {
    display: flex;
    gap: 20px;
}

.warning-banner {
    position: fixed;
    top: -80px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--low);
    color: white;
    padding: 16px 32px;
    border-radius: 0 0 8px 8px;
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.3px;
    box-shadow: 0 4px 16px rgba(233, 69, 96, 0.4);
    transition: top 0.3s ease;
    z-index: 1000;
}

.warning-banner.show {
    top: 0;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}


/* Mobile menu toggle */
.mobile-toggle {
    display: none;
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 24px;
    cursor: pointer;
    box-shadow: 0 4px 12px var(--shadow);
    z-index: 200;
    transition: all 0.3s ease;
}

.mobile-toggle:active {
    transform: scale(0.95);
}

@media (max-width: 768px) {
    .mobile-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    #sidebar.mobile-hidden {
        display: none;
    }
    
    #truth-panel.mobile-hidden {
        display: none;
    }
    
    #canvas-container.expanded {
        grid-row: 1 / -1;
    }
}

/* Improve scrollbar on mobile */
@media (max-width: 768px) {
    ::-webkit-scrollbar {
        width: 4px;
        height: 4px;
    }
}

/* Better touch targets */
@media (max-width: 768px) {
    .toolbar-buttons button,
    .truth-controls button {
        min-height: 44px;
        min-width: 44px;
    }
}