:root {
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --panel-border: rgba(255, 255, 255, 0.08);
    --text-color: #f8fafc;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --secondary-bg: #334155;
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    width: 100vw;
    height: 100vh;
}

#layout-container {
    display: flex;
    width: 100%;
    height: 100%;
}

/* ======== 左側 3D 區域 ======== */
#left-panel {
    flex: 1; /* 佔滿剩餘空間 (約 60~70%) */
    position: relative;
    overflow: hidden;
}

#canvas-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#canvas-wrapper canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}

#ui-container {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 320px; /* 從 380px 縮小 */
    max-height: 85vh;
    background-color: rgba(15, 23, 42, 0.85); /* 稍微增加透明度，減少視線遮擋 */
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 15px;
    overflow-y: auto;
}

h1 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

p {
    font-size: 0.85rem;
    color: #94a3b8;
    margin-bottom: 20px;
    line-height: 1.5;
}

/* 控制區域 */
.upload-btn-wrapper {
    position: relative;
    overflow: hidden;
    display: inline-block;
    width: 100%;
}

.btn {
    border: none;
    color: white;
    background-color: var(--accent-color);
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.2s, transform 0.1s;
    box-shadow: 0 4px 6px rgba(59, 130, 246, 0.3);
}

.btn:hover { background-color: var(--accent-hover); }
.btn:active { transform: scale(0.98); }

.upload-btn-wrapper input[type=file] {
    font-size: 100px;
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    cursor: pointer;
    height: 100%;
}

#controls {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    animation: fadeIn 0.5s ease-in-out;
}

.hidden { display: none !important; }

.control-btn {
    border: none;
    color: white;
    background-color: var(--accent-color);
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}
.control-btn.secondary { background-color: var(--secondary-bg); }
.control-btn.secondary:hover { background-color: #475569; }
.control-btn:hover { background-color: var(--accent-hover); }

.slider-container {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
    color: #cbd5e1;
}

input[type=range] {
    flex-grow: 1;
    accent-color: var(--accent-color);
    cursor: pointer;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ======== 右側 LMA 圖表區域 ======== */
#right-panel {
    flex: 0 0 clamp(400px, 35vw, 650px); /* 使用動態比例，寬度介於 400px ~ 650px 之間 */
    background-color: rgba(15, 23, 42, 0.98);
    border-left: 1px solid var(--panel-border);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 20px 15px;
    gap: 15px;
    overflow-y: auto;
}

#chart-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: #f1f5f9;
    margin-bottom: 5px;
    text-align: center;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--panel-border);
}

#metrics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: 170px;
    gap: 12px;
    width: 100%;
}

.chart-box {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 10px;
    padding: 8px;
    position: relative;
    display: flex;
    flex-direction: column;
}

.chart-box canvas {
    width: 100% !important;
    height: 100% !important;
}

/* ======== 響應式佈局 (Responsive Design) ======== */

/* 當螢幕寬度小於 1400px (如常見筆電) */
@media (max-width: 1440px) {
    #ui-container {
        width: 280px;
        padding: 15px;
        top: 15px;
        left: 15px;
    }
    
    #metrics-grid {
        grid-auto-rows: 160px;
    }
}

/* 當螢幕寬度較窄 (螢幕寬度小於 1200px) */
@media (max-width: 1250px) {
    #right-panel {
        flex: 0 0 420px;
    }
    
    #metrics-grid {
        grid-template-columns: repeat(2, 1fr); /* 切換為 2 欄排列 */
        grid-auto-rows: 150px;
    }
}

/* 針對高度不足的螢幕優化 */
@media (max-height: 800px) {
    #ui-container {
        max-height: 90vh;
        gap: 10px;
    }
    
    #metrics-grid {
        grid-auto-rows: 140px;
    }
}