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

        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            line-height: 1.6;
            margin: 0;
            }

.container { margin: 20px; }

.card {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    padding: 40px;
    border: 1px solid #e2e8f0;
}

/* Simulation Wrapper */
.sim-wrapper {
    display: flex !important;
    justify-content: center !important;
    align-items: flex-start !important;
    width: 100% !important;
    margin: 20px 0 !important;
    overflow: visible !important;
}

#total {
    position: relative;
    width: 600px;
    height: 460px;
    background-color: var(--panel-bg);
    border: 1px solid #ddd;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    flex-shrink: 0;
}

#canvas {
    position: absolute;
    left: 0;
    top: 0;
    width: 600px;
    height: 300px;
    background: #fff;
}

#panel {
    position: absolute;
    left: 0;
    top: 300px;
    width: 600px;
    height: 160px;
    padding: 10px 15px;
    background: var(--panel-bg);
    border-top: 1px solid #eee;
    font-size: 0.85rem;
    display: flex !important;
    flex-direction: column !important;
    justify-content: space-around !important;
    align-items: center !important;
    box-sizing: border-box;
}

/* 覆盖 app.css 中的绝对定位 */
#panel div, #panel span, #panel input, #panel select, #panel button, #panel label {
    position: static !important;
    width: auto !important;
    margin: 0 !important;
}

#panel span {
    white-space: normal !important;
}

.controls-row {
    display: flex !important;
    gap: 15px !important;
    width: 100% !important;
    justify-content: center !important;
    align-items: center !important;
    flex-wrap: wrap !important;
}

.radio-group {
    display: flex !important;
    gap: 10px !important;
    background: #fff !important;
    padding: 3px 12px !important;
    border-radius: 15px !important;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05) !important;
    border: 1px solid #e2e8f0 !important;
}

.radio-item, .checkbox-item {
    display: flex !important;
    align-items: center !important;
    gap: 5px !important;
}

.checks-group {
    font-size: 0.8rem !important;
    gap: 10px !important;
}

button {
    padding: 5px 15px !important;
    border-radius: 6px !important;
    border: 1px solid #cbd5e1 !important;
    cursor: pointer !important;
    font-weight: 600 !important;
    transition: all 0.2s !important;
    background: white !important;
    font-size: 0.85rem !important;
    min-width: 80px !important;
}

button:hover { background: #f0f0f0 !important; }

select {
    padding: 4px 8px !important;
    border-radius: 4px !important;
    border: 1px solid #cbd5e1 !important;
}

.credits {
    width: 100% !important;
    text-align: center !important;
    margin-top: 5px !important;
    opacity: 0.6 !important;
    font-size: 0.75rem !important;
}

/* Mobile full-width adaptation */
@media (max-width: 600px) {
    .container { margin: 0 !important; padding: 0 !important; }
    .card { padding: 15px 10px !important; border-radius: 0 !important; }
    .sim-wrapper { margin: 10px 0 !important; }
}