:root {
    --primary-color: #2c3e50;
    --accent-color: #3498db;
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #333;
    --panel-bg: #f8f9fa;
    --border-color: #e2e8f0;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

.container { margin: 20px; }

.card {
    background: #ffffff;
    border-radius: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    padding: 40px;
    border: 1px solid var(--border-color);
    position: relative;
}

h1 {
    text-align: center;
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 25px;
    font-weight: 800;
}

.description {
    margin-bottom: 30px;
    color: #64748b;
    font-size: 1.05rem;
    text-align: center;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    background: transparent;
    padding: 0;
    border: none;
    box-shadow: none;
}

/* AGGRESSIVE OVERRIDE: Using div#panel to beat legacy app.css specificity */
div#panel {
    position: absolute !important;
    left: 540px !important;
    top: 0 !important;
    width: 240px !important;
    height: 480px !important;
    background: #f8fafc !important;
    border-left: 1px solid var(--border-color) !important;
    padding: 20px !important;
    z-index: 100 !important;
    font-family: inherit !important;
    border-radius: 0 12px 12px 0 !important;
    display: flex !important;
    flex-direction: column !important;
}

/* Fix nested elements from legacy absolute positioning */
div#panel div, div#panel span, div#panel select {
    position: static !important;
    margin-bottom: 10px !important;
    background: transparent !important;
    border: none !important;
    width: auto !important;
    height: auto !important;
    display: block !important;
}

div#panel select {
    display: block !important;
    width: 100% !important;
    padding: 8px !important;
    border-radius: 6px !important;
    border: 1px solid #cbd5e1 !important;
    margin-top: 8px !important;
    background-color: #fff !important;
    font-size: 0.9rem !important;
    outline: none !important;
    position: static !important;
    height: auto !important;
}

div#panel select:focus {
    border-color: var(--accent-color) !important;
}

div#panel span {
    white-space: normal !important;
    font-size: 0.95rem !important;
    color: var(--text-color) !important;
}

div#panel button.btn-reset { background-color: #ffc040 !important; color: #333 !important; }
div#panel button.btn-start { background-color: #00ffff !important; color: #333 !important; }

div#panel .control-group {
    margin-top: 10px !important;
    font-weight: bold !important;
    display: block !important;
    position: static !important;
}

div#panel .credits {
    margin-top: 25px !important;
    border-top: 1px solid #eee !important;
    padding-top: 12px !important;
    font-size: 11px !important;
    opacity: 0.8 !important;
    line-height: 1.5 !important;
    position: static !important;
}

div#panel .credits span {
    display: block !important;
    margin-bottom: 3px !important;
    position: static !important;
}

div#panel button {
    display: block !important;
    width: 100% !important;
    padding: 10px !important;
    margin: 0 0 12px 0 !important;
    border-radius: 8px !important;
    border: 1px solid rgba(0,0,0,0.1) !important;
    cursor: pointer !important;
    font-weight: 600 !important;
    font-size: 0.95rem !important;
    transition: all 0.2s !important;
    height: auto !important;
    text-align: center !important;
    position: static !important;
}

div#panel button:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1) !important;
}

/* Simulation Wrapper */
.sim-wrapper {
    display: block;
    margin: 30px auto;
    overflow: visible;
    position: relative;
}

#total {
    position: relative;
    width: 780px;
    height: 480px;
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transform-origin: top left;
    -webkit-transform-origin: top left;
    flex-shrink: 0;
}

#canvas {
    position: absolute;
    left: 0;
    top: 0;
    width: 780px;
    height: 480px;
    background-color: #fff !important; /* Override yellow background from app.css */
    border: none !important; /* Override black border from app.css */
}

canvas#cv {
    display: block;
    width: 100%;
    height: 100%;
}

.instructions {
    background: #f8fafc;
    padding: 25px;
    border-radius: 12px;
    margin: 30px 0;
    border: 1px solid var(--border-color);
}

.instructions h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.instructions ul {
    padding-left: 20px;
}

.instructions li {
    margin-bottom: 8px;
}

.footer-info {
    text-align: center;
    margin-top: 40px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

@media (max-width: 600px) {
    .container { margin: 0 !important; padding: 0 !important; }
    .card { padding: 15px 10px !important; border-radius: 0 !important; }
}