: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;
            }

        .page-container { margin: 20px; }

        .header-wrapper {
            text-align: center;
            margin-bottom: 30px;
        }

        h1 {
            color: var(--primary-color);
            font-size: 2.2rem;
            margin-bottom: 10px;
            font-weight: 700;
        }

        .back-btn {
            display: inline-flex;
            align-items: center;
            padding: 10px 20px;
            background-color: var(--primary-color);
            color: white !important;
            text-decoration: none;
            border-radius: 8px;
            font-weight: 500;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
            margin-bottom: 20px;
        }

        .back-btn:hover {
            background-color: var(--accent-color);
            transform: translateX(-5px);
        }

        .description {
            background: #fdfdfd;
            padding: 20px;
            border-left: 4px solid var(--accent-color);
            margin-bottom: 30px;
            border-radius: 0 8px 8px 0;
        }

/* Simulation Wrapper for Responsive Scaling */
.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: 400px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    flex-shrink: 0;
    transform-origin: top center;
}

#canvas {
    position: absolute;
    left: 0;
    top: 0;
    width: 340px;
    height: 400px;
    background: #fff;
}

#panel {
    position: absolute;
    left: 340px;
    top: 0;
    width: 260px;
    height: 400px;
    background: var(--panel-bg);
    border-left: 1px solid var(--border-color);
    padding: 15px;
    box-sizing: border-box;
    display: flex !important;
    flex-direction: column !important;
    gap: 12px !important;
}

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

.control-group {
    display: flex !important;
    flex-direction: column !important;
    gap: 5px !important;
}

.input-row {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 8px !important;
}

.unit-input {
    display: flex !important;
    align-items: center !important;
    gap: 5px !important;
}

#panel select {
    width: 100% !important;
    padding: 6px !important;
    border-radius: 4px !important;
    border: 1px solid #ddd !important;
}

#panel input[type="text"] {
    width: 60px !important;
    padding: 4px !important;
    border: 1px solid #ddd !important;
    border-radius: 4px !important;
    text-align: center !important;
}

.result-box {
    border-top: 1px solid #eee !important;
    padding-top: 10px !important;
    display: flex !important;
    flex-direction: column !important;
    gap: 8px !important;
}

.result-row {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    font-size: 0.85rem !important;
}

.info-box {
    background: #eef2ff !important;
    padding: 10px !important;
    border-radius: 8px !important;
    border: 1px solid #c7d2fe !important;
    font-size: 0.85rem !important;
}

.critical-angle {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 3px !important;
    font-weight: bold !important;
    color: #1e3a8a !important;
}

.credits {
    margin-top: auto !important;
    text-align: center !important;
    font-size: 0.75rem !important;
    opacity: 0.6 !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; }
}