:root {
    --primary: #0ea5e9;
    --primary-hover: #0284c7;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --bg-sidebar: #0f172a;
    --border-color: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: #050505;
    color: var(--text-main);
    overflow: hidden;
    touch-action: none;
}

#app-wrapper {
    display: flex;
    width: 100vw;
    height: 100vh;
}

#sidebar {
    width: 320px; /* Nới rộng một chút để chứa 3 nút */
    min-width: 320px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
    z-index: 10;
    box-shadow: 4px 0 15px rgba(0, 0, 0, 0.5);
    overflow-y: auto;
}

#canvas-container {
    flex-grow: 1;
    position: relative;
    background-color: #0a0c10;
}

.header {
    text-align: center;
    margin-bottom: 20px;
}

.header h1 {
    font-size: 1.05rem; 
    font-weight: 700;
    line-height: 1.4;
    text-transform: uppercase;
    background: linear-gradient(90deg, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header p {
    font-size: 0.95rem;
    font-weight: 700;
    color: #fbbf24; 
    text-shadow: 0 0 10px rgba(251, 191, 36, 0.4);
    margin-top: 6px;
    letter-spacing: 2px;
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 20px;
}

.stat-box {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 8px;
    padding: 10px 4px;
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 0.6rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.stat-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    margin-top: 4px;
}

.stat-percent {
    display: block;
    font-size: 0.65rem;
    font-weight: 600;
    margin-top: 2px;
    opacity: 0.85;
}

.text-blue { color: #38bdf8; }
.text-red { color: #f87171; }

.control-row {
    display: flex;
    gap: 8px; /* Thu hẹp khoảng cách giữa các nút */
    margin-bottom: 16px;
}

.btn {
    flex: 1;
    padding: 10px 0;
    border: none;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    color: white;
    transition: all 0.2s;
}

.btn.primary { background: var(--primary); }
.btn.primary:hover { background: var(--primary-hover); }
.btn.primary.active { background: var(--danger); }
.btn.secondary { background: rgba(255, 255, 255, 0.05); border: 1px solid rgba(255,255,255,0.1); }
.btn.secondary:hover { background: rgba(255, 255, 255, 0.1); }

.slider-group { margin-bottom: 14px; }
.slider-group label {
    display: flex; justify-content: space-between;
    font-size: 0.8rem; color: #cbd5e1; margin-bottom: 6px;
}
.slider-group span { color: var(--primary); font-weight: 600; }

input[type=range] {
    -webkit-appearance: none; width: 100%; background: transparent;
}
input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none; height: 16px; width: 16px;
    border-radius: 50%; background: #38bdf8; cursor: pointer;
    margin-top: -6px;
}
input[type=range]::-webkit-slider-runnable-track {
    width: 100%; height: 4px; background: rgba(255, 255, 255, 0.2); border-radius: 2px;
}

.hints {
    margin-top: auto; 
    font-size: 0.75rem; color: var(--text-muted);
    line-height: 1.6; text-align: center; 
    border-top: 1px solid rgba(255,255,255,0.05); 
    padding-top: 15px;
}

.tooltip {
    position: absolute;
    display: none;
    background: rgba(15, 23, 42, 0.95);
    color: #fff;
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    pointer-events: none;
    z-index: 1000;
    border: 1px solid #38bdf8;
    box-shadow: 0 8px 24px rgba(0,0,0,0.6);
    transform: translate(-50%, -150%);
    white-space: nowrap;
}

#mobile-toggle {
    display: none; position: absolute; top: 15px; left: 15px;
    width: 44px; height: 44px; background: var(--bg-sidebar);
    border: 1px solid rgba(255,255,255,0.1); border-radius: 8px;
    color: white; z-index: 20; cursor: pointer;
    justify-content: center; align-items: center;
}
#mobile-toggle svg { width: 24px; height: 24px; }
.mobile-only { display: none; }

@media (max-width: 768px) {
    #mobile-toggle { display: flex; }
    .mobile-only { display: block; }
    
    #close-sidebar {
        background: transparent; border: 1px solid rgba(255,255,255,0.1);
        color: #fff; padding: 8px; border-radius: 6px; margin-bottom: 15px; cursor: pointer;
    }

    #sidebar {
        position: absolute;
        left: -340px;
        height: 100%;
        transition: left 0.3s ease;
    }
    
    #sidebar.open { left: 0; }
}