/* ===========================
   CSS 變數與基礎設定
   =========================== */
:root {
    /* 主色調 - 使用紫色系強調 Embedding 的數學向量概念 */
    --primary: #8b5cf6;
    --primary-light: #a78bfa;
    --primary-dark: #7c3aed;
    
    /* 分類顏色 */
    --color-animal: #f472b6;
    --color-fruit: #34d399;
    --color-vehicle: #60a5fa;
    --color-emotion: #fbbf24;
    --color-custom: #c084fc;
    
    /* 向量顏色 */
    --vec-1: #22d3ee;
    --vec-2: #a78bfa;
    --vec-3: #f472b6;
    --vec-4: #fbbf24;
    --vec-5: #34d399;
    --vec-6: #fb7185;
    --vec-7: #60a5fa;
    --vec-8: #c084fc;
    
    /* 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), var(--vec-1));
    -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;
}

.word-input-group {
    display: flex;
    gap: 0.75rem;
}

.word-input-group input {
    flex: 1;
    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: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.word-input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.word-input-group input::placeholder {
    color: var(--text-muted);
}

.btn-add {
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-add:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

/* 已選擇的詞彙區域 */
.selected-words {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 1rem;
    background: var(--glass);
    border-radius: var(--radius-sm);
    min-height: 50px;
    align-items: center;
}

.selected-word {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    animation: wordAppear 0.3s ease-out;
    cursor: default;
}

.selected-word .remove-word {
    cursor: pointer;
    opacity: 0.7;
    transition: var(--transition);
}

.selected-word .remove-word:hover {
    opacity: 1;
    transform: scale(1.2);
}

/* 詞彙類別顏色 */
.selected-word.animal {
    background: rgba(244, 114, 182, 0.2);
    border: 2px solid var(--color-animal);
    color: var(--color-animal);
}

.selected-word.fruit {
    background: rgba(52, 211, 153, 0.2);
    border: 2px solid var(--color-fruit);
    color: var(--color-fruit);
}

.selected-word.vehicle {
    background: rgba(96, 165, 250, 0.2);
    border: 2px solid var(--color-vehicle);
    color: var(--color-vehicle);
}

.selected-word.emotion {
    background: rgba(251, 191, 36, 0.2);
    border: 2px solid var(--color-emotion);
    color: var(--color-emotion);
}

.selected-word.custom {
    background: rgba(192, 132, 252, 0.2);
    border: 2px solid var(--color-custom);
    color: var(--color-custom);
}

@keyframes wordAppear {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 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(139, 92, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(139, 92, 246, 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);
}

.btn-secondary {
    width: 100%;
    padding: 0.6rem 1rem;
    background: var(--surface-light);
    color: var(--primary-light);
    border: 1px solid var(--primary);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 0.5rem;
}

.btn-secondary:hover {
    background: rgba(139, 92, 246, 0.2);
}

/* ===========================
   Canvas 視覺化區域
   =========================== */
.result-container {
    min-height: 450px;
}

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

#embeddingCanvas {
    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: 50%;
}

.legend-dot.animal { background: var(--color-animal); }
.legend-dot.fruit { background: var(--color-fruit); }
.legend-dot.vehicle { background: var(--color-vehicle); }
.legend-dot.emotion { background: var(--color-emotion); }
.legend-dot.custom { background: var(--color-custom); }

/* ===========================
   向量顯示區域
   =========================== */
.vector-display {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 1rem;
    background: var(--glass);
    border-radius: var(--radius-sm);
    min-height: 80px;
    align-content: flex-start;
}

.vector-item {
    background: var(--surface-light);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    font-family: 'Courier New', monospace;
    animation: wordAppear 0.3s ease-out;
}

.vector-item .word-name {
    font-weight: 600;
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
}

.vector-item .vector-values {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.vector-item .vec-val {
    padding: 2px 6px;
    background: rgba(139, 92, 246, 0.2);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--primary-light);
}

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

.control-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.control-panel h3 {
    margin-bottom: 0.25rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.label-text {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 詞彙選項 Pills */
.word-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.word-pill {
    padding: 6px 12px;
    background: var(--surface-light);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.word-pill:hover {
    background: rgba(139, 92, 246, 0.2);
    border-color: var(--primary);
    color: var(--primary-light);
    transform: translateY(-2px);
}

.word-pill.selected {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* 相似度計算區域 */
.similarity-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.similarity-selector .func-select {
    flex: 1;
}

.similarity-vs {
    color: var(--text-muted);
    font-weight: 600;
}

.similarity-result {
    padding: 1rem;
    background: var(--glass);
    border-radius: var(--radius-sm);
    text-align: center;
    margin-top: 0.5rem;
}

.similarity-value {
    font-size: 2rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
}

.similarity-value.high { color: var(--success); }
.similarity-value.medium { color: var(--warning); }
.similarity-value.low { color: var(--error); }

.similarity-bar {
    height: 8px;
    background: var(--surface-light);
    border-radius: 4px;
    margin-top: 0.75rem;
    overflow: hidden;
}

.similarity-bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease-out;
}

/* 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(139, 92, 246, 0.2);
}

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

/* ===========================
   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);
}

.output-range {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--glass);
    border-radius: var(--radius-sm);
    margin-top: 0.75rem;
}

.range-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.range-value {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--warning);
}

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

/* ===========================
   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;
}

/* 類比演示 */
.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: 0.75rem;
}

.analogy-word {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
}

.analogy-word.king {
    background: rgba(251, 191, 36, 0.2);
    border: 2px solid var(--warning);
    color: var(--warning);
}

.analogy-word.man {
    background: rgba(96, 165, 250, 0.2);
    border: 2px solid var(--color-vehicle);
    color: var(--color-vehicle);
}

.analogy-word.woman {
    background: rgba(244, 114, 182, 0.2);
    border: 2px solid var(--color-animal);
    color: var(--color-animal);
}

.analogy-word.queen {
    background: rgba(192, 132, 252, 0.2);
    border: 2px solid var(--color-custom);
    color: var(--color-custom);
}

.analogy-op {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.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: 1fr 1fr;
    gap: 1.5rem;
}

.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;
}

.encoding-visual {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.encoding-row {
    display: flex;
    align-items: center;
    gap: 4px;
}

.word-label {
    min-width: 40px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.bit {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border: 1px solid var(--glass-border);
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.encoding-visual.onehot .bit:first-of-type {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--error);
    color: var(--error);
}

.encoding-row:nth-child(1) .encoding-visual.onehot .bit:nth-child(2),
.encoding-row:nth-child(2) .encoding-visual.onehot .bit:nth-child(3),
.encoding-row:nth-child(3) .encoding-visual.onehot .bit:nth-child(4) {
    background: rgba(34, 197, 94, 0.2);
    border-color: var(--success);
    color: var(--success);
}

.vec {
    padding: 4px 8px;
    background: rgba(139, 92, 246, 0.2);
    border: 1px solid var(--primary);
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    color: var(--primary-light);
}

.comparison-note {
    font-size: 0.85rem;
    text-align: center;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
}

/* ===========================
   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);
}

/* ===========================
   響應式設計
   =========================== */
@media (max-width: 1200px) {
    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .comparison-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .control-section {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header h1 {
        font-size: 1.75rem;
    }
    
    .control-section {
        grid-template-columns: 1fr;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .analogy-item {
        flex-direction: column;
    }
    
    .analogy-op {
        transform: rotate(90deg);
    }
    
    #embeddingCanvas {
        width: 100%;
        height: 300px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .word-input-group {
        flex-direction: column;
    }
    
    .similarity-selector {
        flex-direction: column;
    }
    
    .similarity-vs {
        display: none;
    }
}