/* ===========================
   CSS 變數與基礎設定
   =========================== */
:root {
    /* 主色調 */
    --primary: #8b5cf6;
    /* Violet */
    --primary-light: #a78bfa;
    --primary-dark: #7c3aed;

    /* 矩陣區塊顏色 (Confusion Matrix Colors) */
    --tp-color: #22c55e;
    /* Green */
    --tn-color: #3b82f6;
    /* Blue */
    --fp-color: #f43f5e;
    /* Red/Rose */
    --fn-color: #f59e0b;
    /* Amber/Orange */

    --tp-bg: rgba(34, 197, 94, 0.15);
    --tn-bg: rgba(59, 130, 246, 0.15);
    --fp-bg: rgba(244, 63, 94, 0.15);
    --fn-bg: rgba(245, 158, 11, 0.15);

    /* 背景與表面 */
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1e293b;
    --surface: rgba(30, 41, 59, 0.8);
    --surface-light: rgba(51, 65, 85, 0.6);
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);

    /* 文字 */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* 其他 */
    --radius: 16px;
    --radius-sm: 8px;
    --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ===========================
   容器佈局
   =========================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===========================
   頁首
   =========================== */
.header {
    text-align: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--glass);
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #a78bfa, #f472b6);
    /* Violet to Pink */
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ===========================
   主要內容區
   =========================== */
.main-content {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 2rem;
}

/* ===========================
   視覺化區域 (左側)
   =========================== */
.visualization-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.canvas-container {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    height: 100%;
    min-height: 320px;
    position: relative;
    overflow: hidden;
}

canvas {
    width: 100%;
    height: 100%;
    cursor: col-resize;
    /* 提示可以左右拖動閾值 */
    border-radius: var(--radius-sm);
}

.canvas-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--glass);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    pointer-events: none;
    backdrop-filter: blur(4px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* 數據顯示面板 */
.stats-panel {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.stat-card {
    background: var(--glass);
    padding: 1rem;
    border-radius: var(--radius-sm);
    text-align: center;
    border: 1px solid transparent;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    background: var(--surface-light);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: monospace;
}

/* 指標顏色 */
.accuracy .stat-value {
    color: #e2e8f0;
}

.precision .stat-value {
    color: #f472b6;
}

.recall .stat-value {
    color: #22d3ee;
}

.f1 .stat-value {
    color: #a78bfa;
}


/* ===========================
   混淆矩陣區域 (右側)
   =========================== */
.control-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* 混淆矩陣表格 */
.matrix-container {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.matrix-title {
    text-align: center;
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.confusion-matrix {
    display: grid;
    /* Columns: Left-Axis-Label | Row-Header | Data-Col-1 | Data-Col-2 */
    grid-template-columns: 30px 40px 1fr 1fr;
    /* Rows: Col-Header | Data-Row-1 | Data-Row-2 */
    grid-template-rows: auto 1fr 1fr;
    gap: 0.5rem;
    align-items: center;
}

/* 頂部欄位標題 (Actual) */
.col-header {
    text-align: center;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 0.5rem;
    background: var(--surface-light);
    border-radius: var(--radius-sm);
}

.header-pos {
    grid-row: 1;
    grid-column: 3;
}

.header-neg {
    grid-row: 1;
    grid-column: 4;
}

/* 左側大標題 (Predicted Class) */
.matrix-label.left {
    grid-row: 2 / 4;
    /* Spans both data rows */
    grid-column: 1;
    writing-mode: vertical-lr;
    transform: rotate(180deg);
    text-align: center;
    font-weight: 700;
    color: var(--text-primary);
    justify-self: center;
}

/* 列標題 (Predicted Pos/Neg) */
.row-header {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    writing-mode: vertical-lr;
    /* 為了節省空間，或者保持水平? 嘗試垂直看看，或簡寫 P/N */
    transform: rotate(180deg);
}

.row-pos {
    grid-row: 2;
    grid-column: 2;
}

.row-neg {
    grid-row: 3;
    grid-column: 2;
}

/* 矩陣格子定位 */
#cellTP {
    grid-row: 2;
    grid-column: 3;
}

#cellFP {
    grid-row: 2;
    grid-column: 4;
}

#cellFN {
    grid-row: 3;
    grid-column: 3;
}

#cellTN {
    grid-row: 3;
    grid-column: 4;
}

.mt-label {
    font-size: 0.9rem;
    font-weight: 700;
    display: block;
    margin-bottom: 0.25rem;
}

.mt-value {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: monospace;
}

.mt-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* 個別格子顏色 */
/* CSS Clean up - Remove old class specific styles if replaced by ID selectors above, 
   but keeping the styling classes (cell-tp, etc) for colors is good. */
.matrix-cell {
    position: relative;
    background: var(--glass);
    padding: 1rem 0.5rem;
    border-radius: var(--radius-sm);
    text-align: center;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
}

/* Specific cell styles remain same, just ensure they apply */
.cell-tp {
    border-color: var(--tp-color);
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--tp-bg));
}

.cell-tp .mt-label,
.cell-tp .mt-value {
    color: var(--tp-color);
}

.cell-tn {
    border-color: var(--tn-color);
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--tn-bg));
}

.cell-tn .mt-label,
.cell-tn .mt-value {
    color: var(--tn-color);
}

.cell-fp {
    border-color: var(--fp-color);
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--fp-bg));
}

.cell-fp .mt-label,
.cell-fp .mt-value {
    color: var(--fp-color);
}

.cell-fn {
    border-color: var(--fn-color);
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--fn-bg));
}

.cell-fn .mt-label,
.cell-fn .mt-value {
    color: var(--fn-color);
}


/* 控制面板 */
.control-panel {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
}

.control-item {
    margin-bottom: 1.25rem;
}

.control-item:last-child {
    margin-bottom: 0;
}

.control-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    background: var(--surface-light);
    height: 6px;
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* ===========================
   下方教學說明區域
   =========================== */
.info-section {
    margin-top: 2rem;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

.info-card {
    background: var(--surface);
    padding: 1.25rem;
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.info-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0.5rem;
}

.info-list {
    list-style: none;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.info-list li {
    margin-bottom: 0.4rem;
    padding-left: 0.8rem;
    position: relative;
}

.info-list li::before {
    content: "•";
    color: var(--primary-light);
    position: absolute;
    left: 0;
}

/* ===========================
   頁尾
   =========================== */
.footer {
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--glass-border);
}

.back-home {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.6rem 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.back-home:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(139, 92, 246, 0.5);
}

/* 響應式 */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .confusion-matrix {
        max-width: 500px;
        margin: 0 auto;
    }

    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .info-grid {
        grid-template-columns: 1fr;
    }
}