/* ===========================
   CSS 變數與基礎設定
   =========================== */
:root {
    /* 主色調 - 使用青綠色系強調數據處理概念 */
    --primary: #14b8a6;
    --primary-light: #2dd4bf;
    --primary-dark: #0d9488;

    /* 縮放方法顏色 */
    --color-minmax: #f472b6;
    --color-zscore: #60a5fa;
    --color-maxabs: #fbbf24;
    --color-original: #94a3b8;

    /* 特徵顏色 */
    --feature-1: #f472b6;
    --feature-2: #60a5fa;
    --feature-3: #fbbf24;

    /* 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);

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

    /* 狀態顏色 */
    --success: #22c55e;
    --warning: #fbbf24;
    --error: #ef4444;

    /* 圓角與陰影 */
    --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);
}

/* 重置樣式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 頁面基礎樣式 */
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;
}

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

/* ===========================
   頁首樣式
   =========================== */
.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, var(--primary-light), #22d3ee);
    -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;
}

/* ===========================
   主要內容區域
   =========================== */
.main-content {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 2rem;
}

.visualization-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ===========================
   輸入區域樣式
   =========================== */
.input-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.dataset-selector {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* 下拉選單樣式 */
.func-select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--surface-light);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpolyline points='6,9 12,15 18,9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1.25rem;
    padding-right: 2.5rem;
}

.func-select:hover,
.func-select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.2);
}

.func-select option {
    background: var(--bg-gradient-end);
    color: var(--text-primary);
}

/* 自訂資料輸入 */
.custom-input-area {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--glass);
    border-radius: var(--radius-sm);
    border: 1px dashed var(--glass-border);
}

.custom-input-group {
    display: flex;
    gap: 0.5rem;
}

.name-input {
    width: 120px;
    padding: 0.6rem 0.75rem;
    background: var(--surface-light);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--primary-light);
    font-size: 0.9rem;
    font-family: inherit;
    font-weight: 500;
    transition: var(--transition);
}

.value-input {
    flex: 1;
    padding: 0.6rem 0.75rem;
    background: var(--surface-light);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    transition: var(--transition);
}

.name-input:focus,
.value-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.2);
}

.name-input::placeholder,
.value-input::placeholder {
    color: var(--text-muted);
}

/* 按鈕組 */
.button-group {
    display: flex;
    gap: 0.75rem;
}

.btn-primary {
    flex: 1;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(20, 184, 166, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(20, 184, 166, 0.5);
}

.btn-reset {
    padding: 0.75rem 1rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-reset:hover {
    background: var(--glass-border);
    transform: translateY(-2px);
}

/* ===========================
   資料表格樣式
   =========================== */
.data-table-container {
    overflow: hidden;
}

.table-wrapper {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th {
    background: var(--surface-light);
    color: var(--primary-light);
    padding: 0.75rem 1rem;
    text-align: center;
    font-weight: 600;
    border-bottom: 2px solid var(--primary);
    white-space: nowrap;
}

.data-table td {
    padding: 0.6rem 1rem;
    text-align: center;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

.data-table tr:hover td {
    background: var(--glass);
}

/* 特徵顏色標記 */
.data-table th.feature-1 { border-bottom-color: var(--feature-1); color: var(--feature-1); }
.data-table th.feature-2 { border-bottom-color: var(--feature-2); color: var(--feature-2); }
.data-table th.feature-3 { border-bottom-color: var(--feature-3); color: var(--feature-3); }

/* ===========================
   圖表區域
   =========================== */
.result-container {
    min-height: 450px;
}

.chart-tabs,
.result-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.chart-tab,
.result-tab {
    padding: 0.5rem 1rem;
    background: var(--surface-light);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.chart-tab:hover,
.result-tab:hover {
    background: rgba(20, 184, 166, 0.15);
    border-color: var(--primary);
    color: var(--primary-light);
}

.chart-tab.active,
.result-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.canvas-wrapper {
    width: 100%;
    background: var(--glass);
    border-radius: var(--radius-sm);
    padding: 1rem;
    display: flex;
    justify-content: center;
    overflow: hidden;
}

#scalingCanvas {
    background: rgba(15, 23, 42, 0.8);
    border-radius: var(--radius-sm);
    max-width: 100%;
    height: auto;
}

.canvas-legend {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
    padding: 0.75rem;
    background: var(--glass);
    border-radius: var(--radius-sm);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.legend-dot {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

/* ===========================
   控制面板樣式
   =========================== */
.control-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* ===========================
   卡片通用樣式
   =========================== */
.card {
    background: var(--surface);
    padding: 1.25rem;
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.card p:last-child {
    margin-bottom: 0;
}

/* ===========================
   公式面板
   =========================== */
.formula-panel {
    background: var(--surface);
}

.formula-group {
    margin-bottom: 1.25rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--glass-border);
}

.formula-group:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.formula-title {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.formula-title.minmax-color { color: var(--color-minmax); }
.formula-title.zscore-color { color: var(--color-zscore); }
.formula-title.maxabs-color { color: var(--color-maxabs); }

.formula-box {
    background: rgba(15, 23, 42, 0.6);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
}

.formula {
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    color: var(--text-primary);
    text-align: center;
    font-weight: 600;
}

.formula sub {
    font-size: 0.75em;
}

.formula-desc {
    font-size: 0.8rem !important;
    color: var(--text-muted) !important;
}

/* ===========================
   統計資訊面板
   =========================== */
.stats-display {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.stat-group {
    padding: 0.75rem;
    background: var(--glass);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary);
}

.stat-group h4 {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.stat-group.feature-1-border { border-left-color: var(--feature-1); }
.stat-group.feature-2-border { border-left-color: var(--feature-2); }
.stat-group.feature-3-border { border-left-color: var(--feature-3); }

.stat-group h4.feature-1-color { color: var(--feature-1); }
.stat-group h4.feature-2-color { color: var(--feature-2); }
.stat-group h4.feature-3-color { color: var(--feature-3); }

.stat-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    padding: 2px 0;
}

.stat-label {
    color: var(--text-muted);
}

.stat-value {
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-weight: 500;
}

/* ===========================
   方法選擇指南
   =========================== */
.method-guide {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.guide-item {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    padding: 0.75rem;
    background: var(--glass);
    border-radius: var(--radius-sm);
}

.guide-dot {
    width: 12px;
    height: 12px;
    border-radius: 3px;
    flex-shrink: 0;
    margin-top: 4px;
}

.guide-dot.minmax-bg { background: var(--color-minmax); }
.guide-dot.zscore-bg { background: var(--color-zscore); }
.guide-dot.maxabs-bg { background: var(--color-maxabs); }

.guide-item strong {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.guide-item p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

/* 佔位文字 */
.placeholder-text {
    color: var(--text-muted);
    font-style: italic;
    width: 100%;
    text-align: center;
    padding: 1rem;
}

/* 標籤文字 */
.label-text {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

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

.compare-list,
.tips-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.compare-list li,
.tips-list li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding-left: 1rem;
    position: relative;
}

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

.tips-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-light);
}

/* ===========================
   演示區域
   =========================== */
.animation-section {
    margin-top: 2rem;
}

.animation-card {
    min-height: 200px;
}

.demo-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* 直覺比喻 */
.analogy-demo {
    padding: 1.5rem;
    background: var(--glass);
    border-radius: var(--radius-sm);
}

.analogy-demo h4 {
    color: var(--primary-light);
    margin-bottom: 0.75rem;
}

.demo-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.analogy-visual {
    display: flex;
    justify-content: center;
    padding: 1.5rem;
    background: rgba(15, 23, 42, 0.5);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
}

.analogy-item {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
}

.analogy-op {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-light);
}

.scale-example {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.scale-label {
    font-size: 0.85rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 12px;
}

.scale-label.before {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error);
}

.scale-label.after {
    background: rgba(34, 197, 94, 0.2);
    color: var(--success);
}

.scale-bars {
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    height: 120px;
}

.scale-bar {
    width: 50px;
    border-radius: 6px 6px 0 0;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 8px;
    position: relative;
}

.bar-value {
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    white-space: nowrap;
}

.height-bar {
    height: 110px;
    background: linear-gradient(180deg, var(--feature-1), rgba(244, 114, 182, 0.5));
}

.weight-bar {
    height: 45px;
    background: linear-gradient(180deg, var(--feature-2), rgba(96, 165, 250, 0.5));
}

.height-bar-scaled {
    height: 85px;
    background: linear-gradient(180deg, var(--feature-1), rgba(244, 114, 182, 0.5));
}

.weight-bar-scaled {
    height: 78px;
    background: linear-gradient(180deg, var(--feature-2), rgba(96, 165, 250, 0.5));
}

.analogy-explanation {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.analogy-explanation p {
    margin-bottom: 0.5rem;
}

/* 比較演示 */
.comparison-demo {
    padding: 1.5rem;
    background: var(--glass);
    border-radius: var(--radius-sm);
}

.comparison-demo h4 {
    color: var(--primary-light);
    margin-bottom: 1rem;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.comparison-item {
    padding: 1rem;
    background: rgba(15, 23, 42, 0.5);
    border-radius: var(--radius-sm);
}

.comparison-item h5 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    text-align: center;
    font-size: 0.9rem;
}

.method-visual {
    margin-bottom: 0.75rem;
}

.number-line {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nl-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: 'Courier New', monospace;
    white-space: nowrap;
}

.nl-bar {
    flex: 1;
    height: 8px;
    border-radius: 4px;
}

.nl-bar.minmax-bar {
    background: linear-gradient(90deg, var(--color-minmax), rgba(244, 114, 182, 0.3));
}

.nl-bar.zscore-bar {
    background: linear-gradient(90deg, rgba(96, 165, 250, 0.3), var(--color-zscore), rgba(96, 165, 250, 0.3));
}

.nl-bar.maxabs-bar {
    background: linear-gradient(90deg, var(--color-maxabs), rgba(251, 191, 36, 0.3), var(--color-maxabs));
}

.comparison-note {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
}

/* 影片區域 */
.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-sm);
}

/* ===========================
   頁尾樣式
   =========================== */
.footer {
    text-align: center;
    margin-top: 2rem;
    padding: 1.5rem;
    color: var(--text-muted);
}

.footer p {
    margin-bottom: 0.75rem;
    color: var(--text-muted);
}

.back-home {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.back-home:hover {
    background: rgba(20, 184, 166, 0.15);
    border-color: var(--primary);
    color: var(--primary-light);
    transform: translateY(-2px);
}

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

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

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

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .header h1 {
        font-size: 1.8rem;
    }

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

    .custom-input-group {
        flex-direction: column;
    }

    .name-input {
        width: 100%;
    }

    .scale-bars {
        height: 80px;
    }

    .height-bar {
        height: 75px;
    }

    .weight-bar {
        height: 30px;
    }

    .height-bar-scaled {
        height: 58px;
    }

    .weight-bar-scaled {
        height: 53px;
    }
}