/* OmniAI 五子棋樣式 - 統一設計系統 */

/* ===== CSS 變數系統 ===== */
:root {
    /* 顏色系統 */
    --color-primary: #4299e1;
    --color-primary-hover: #3182ce;
    --color-primary-light: #90cdf4;
    --color-primary-dark: #2b6cb0;
    
    --color-secondary: #718096;
    --color-secondary-hover: #4a5568;
    --color-secondary-light: #a0aec0;
    
    --color-success: #38a169;
    --color-success-light: #c6f6d5;
    --color-warning: #d69e2e;
    --color-danger: #e53e3e;
    --color-danger-light: #fed7d7;
    --color-info: #3182ce;
    
    --color-background: linear-gradient(135deg, #3b82f6 0%, #1e3a8a 100%);
    --color-surface: rgba(255, 255, 255, 0.95);
    --color-surface-hover: rgba(255, 255, 255, 0.98);
    --color-text-primary: #2d3748;
    --color-text-secondary: #718096;
    --color-text-muted: #a0aec0;
    --color-text-white: #ffffff;
    
    --color-border: #e2e8f0;
    --color-border-hover: #cbd5e0;
    --color-border-focus: var(--color-primary);
    
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-shadow-hover: rgba(0, 0, 0, 0.15);
    --color-shadow-focus: rgba(66, 153, 225, 0.1);
    
    /* 字體系統 */
    --font-family-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* 間距系統 */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    /* 圓角系統 */
    --radius-xs: 0.25rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-4xl: 2.5rem;
    --radius-full: 9999px;
    
    /* 陰影系統 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* 動畫系統 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 斷點系統 */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;
}

/* ===== 基礎樣式重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    background: var(--color-background);
    min-height: 100vh;
    color: var(--color-text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== 組件樣式 ===== */

/* 標題組件 */
.header {
    background: var(--color-surface);
    backdrop-filter: blur(10px);
    padding: var(--spacing-4) var(--spacing-8);
    box-shadow: var(--shadow-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0 0 var(--radius-2xl) var(--radius-2xl);
    margin: var(--spacing-4) var(--spacing-4) 0 var(--spacing-4);
    position: relative;
    z-index: 100;
}

.header h1 {
    color: var(--color-text-primary);
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.header-logout-btn {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    white-space: nowrap;
}

.game-info, .room-info {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.game-info span, .room-info span {
    background: #4299e1;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* ===== 佈局系統 ===== */

/* 容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.container-sm {
    max-width: 640px;
}

.container-md {
    max-width: 768px;
}

.container-lg {
    max-width: 1024px;
}

.container-xl {
    max-width: 1280px;
}

.container-2xl {
    max-width: 1536px;
}

/* 主要內容區域 */
.main {
    padding: var(--spacing-8);
    max-width: 1200px;
    margin: 0 auto;
}

/* 網格系統 */
.grid {
    display: grid;
    gap: var(--spacing-6);
}

.grid-cols-1 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-auto-fit {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-auto-fill {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

/* 彈性佈局 */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.flex-row {
    flex-direction: row;
}

.flex-wrap {
    flex-wrap: wrap;
}

.items-center {
    align-items: center;
}

.items-start {
    align-items: flex-start;
}

.items-end {
    align-items: flex-end;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-around {
    justify-content: space-around;
}

.justify-evenly {
    justify-content: space-evenly;
}

/* 間距工具類 */
.gap-1 { gap: var(--spacing-1); }
.gap-2 { gap: var(--spacing-2); }
.gap-3 { gap: var(--spacing-3); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }
.gap-8 { gap: var(--spacing-8); }

/* 歡迎區域 */
.welcome-section {
    text-align: center;
    margin-bottom: var(--spacing-12);
    padding: var(--spacing-8) 0;
}

.welcome-section h2 {
    color: var(--color-text-white);
    font-size: var(--font-size-5xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-4);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    line-height: var(--line-height-tight);
}

.welcome-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-8);
    line-height: var(--line-height-relaxed);
}

/* 功能網格 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-8);
    margin-top: var(--spacing-8);
    padding: var(--spacing-4);
}

/* 卡片容器增強 */
.feature-grid .feature-card {
    position: relative;
    overflow: hidden;
}

.feature-grid .feature-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(255, 255, 255, 0.1) 0%, 
        rgba(255, 255, 255, 0.05) 50%, 
        rgba(255, 255, 255, 0.1) 100%);
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
    z-index: -1;
}

.feature-grid .feature-card:hover::after {
    opacity: 1;
}

/* 卡片組件 */
.card {
    background: var(--color-surface);
    padding: var(--spacing-8);
    border-radius: var(--radius-3xl);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all var(--transition-normal);
    border: 2px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: -1;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15), 0 8px 24px rgba(0, 0, 0, 0.1);
    border-color: var(--color-primary-light);
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    margin-bottom: var(--spacing-6);
    position: relative;
    z-index: 1;
}

.card-title {
    color: var(--color-text-primary);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-4);
    line-height: var(--line-height-tight);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.card-description {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-6);
    font-weight: var(--font-weight-medium);
}

.card-content {
    flex: 1;
    position: relative;
    z-index: 1;
}

.card-footer {
    margin-top: var(--spacing-6);
    padding-top: var(--spacing-4);
    border-top: 2px solid var(--color-border);
    position: relative;
    z-index: 1;
}

/* 功能卡片變體 */
.feature-card {
    text-align: center;
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 280px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 255, 255, 0.9) 100%);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-3xl);
}

.feature-card:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.95) 100%);
    border-color: var(--color-primary);
}

.feature-card h3 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-4);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
}

.feature-card p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-6);
    line-height: var(--line-height-relaxed);
    flex: 1;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-medium);
}

/* 卡片圖標樣式 */
.feature-card h3::before {
    font-size: var(--font-size-3xl);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

/* 特殊卡片樣式 */
.feature-card:nth-child(1) {
    border-left: 4px solid var(--color-primary);
}

.feature-card:nth-child(2) {
    border-left: 4px solid var(--color-success);
}

.feature-card:nth-child(3) {
    border-left: 4px solid var(--color-info);
}

.feature-card:nth-child(4) {
    border-left: 4px solid var(--color-warning);
}


/* 個人資料卡片樣式 */
#profile-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-4);
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(5px);
}

.user-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    text-align: center;
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-3);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.user-stats p {
    margin: 0;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.user-stats strong {
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
}

#profile-button {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    align-items: center;
    width: 100%;
}

#profile-button .btn {
    white-space: nowrap;
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    min-width: 120px;
    width: 100%;
    font-weight: var(--font-weight-semibold);
}

/* 個人資料頁面樣式 */
.profile-main {
    padding: var(--spacing-6);
    max-width: 1200px;
    margin: 0 auto;
    min-height: calc(100vh - 80px);
}

.profile-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

/* 個人資料卡片 */
.profile-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.profile-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    pointer-events: none;
}

.profile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-6);
    position: relative;
    z-index: 1;
}

.profile-header h2 {
    color: white;
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    margin: 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.rating {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    background: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(5px);
}

.rating span {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-sm);
}

.rating strong {
    color: white;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
}

/* 統計網格 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-4);
    position: relative;
    z-index: 1;
}

.stat-card {
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    text-align: center;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    pointer-events: none;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    background: rgba(255, 255, 255, 0.2);
}

.stat-card h3 {
    color: white;
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    margin: 0 0 var(--spacing-2) 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.stat-card p {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-sm);
    margin: 0;
    font-weight: var(--font-weight-medium);
    position: relative;
    z-index: 1;
}

/* 歷史記錄區域 */
.history-section {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
}

.history-section h3 {
    color: #2d3748;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin: 0 0 var(--spacing-4) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.history-section h3::before {
    content: '📊';
    font-size: 1.2rem;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-4);
    background: #f7fafc;
    border-radius: var(--radius-lg);
    border-left: 4px solid #4299e1;
    transition: all 0.3s ease;
}

.history-item:hover {
    background: #edf2f7;
    transform: translateX(5px);
}

.history-item.win {
    border-left-color: #48bb78;
    background: #f0fff4;
}

.history-item.loss {
    border-left-color: #f56565;
    background: #fff5f5;
}

.history-item.draw {
    border-left-color: #ed8936;
    background: #fffaf0;
}

.history-game-info {
    flex: 1;
}

.history-game-info h4 {
    color: #2d3748;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin: 0 0 var(--spacing-1) 0;
}

.history-game-info p {
    color: #718096;
    font-size: var(--font-size-sm);
    margin: 0;
}

.history-result {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.history-result .result-badge {
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
}

.history-result .result-badge.win {
    background: #c6f6d5;
    color: #22543d;
}

.history-result .result-badge.loss {
    background: #fed7d7;
    color: #742a2a;
}

.history-result .result-badge.draw {
    background: #feebc8;
    color: #7b341e;
}

.history-result .rating-change {
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
}

.history-result .rating-change.positive {
    color: #38a169;
}

.history-result .rating-change.negative {
    color: #e53e3e;
}

.history-result .rating-change.neutral {
    color: #718096;
}

/* 評分圖表區域 */
.rating-chart {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
}

.rating-chart h3 {
    color: #2d3748;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin: 0 0 var(--spacing-4) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.rating-chart h3::before {
    content: '📈';
    font-size: 1.2rem;
}

.rating-chart canvas {
    width: 100%;
    height: 200px;
    border-radius: var(--radius-lg);
    background: #f7fafc;
}

/* 個人資料操作按鈕 */
.profile-actions {
    display: flex;
    gap: var(--spacing-3);
    align-items: center;
}

/* 響應式設計 */
@media (max-width: 768px) {
    .profile-main {
        padding: var(--spacing-4);
    }
    
    .profile-header {
        flex-direction: column;
        gap: var(--spacing-4);
        text-align: center;
    }
    
    .profile-header h2 {
        font-size: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .history-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-2);
    }
    
    .history-result {
        align-self: flex-end;
    }
    
    .rating-chart canvas {
        height: 150px;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .profile-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .profile-actions .btn {
        width: 100%;
    }
}

/* 按鈕組件 */
.btn {
    padding: var(--spacing-3) var(--spacing-8);
    border: none;
    border-radius: var(--radius-2xl);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    white-space: nowrap;
    min-width: fit-content;
    position: relative;
    overflow: hidden;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-shadow-focus);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* 主要按鈕 */
.btn.primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    color: var(--color-text-white);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-2);
}

.btn.primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--color-primary-hover), var(--color-primary-dark));
}

/* 次要按鈕 */
.btn.secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
}

.btn.secondary:hover:not(:disabled) {
    background: var(--color-surface-hover);
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* 危險按鈕 */
.btn.danger {
    background: var(--color-danger);
    color: var(--color-text-white);
    box-shadow: var(--shadow-md);
}

.btn.danger:hover:not(:disabled) {
    background: #c53030;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 警告按鈕 */
.btn.warning {
    background: var(--color-warning);
    color: var(--color-text-white);
    box-shadow: var(--shadow-md);
}

.btn.warning:hover:not(:disabled) {
    background: #b7791f;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 和棋確認模態框樣式 */
.draw-confirm-content {
    max-width: 400px;
    text-align: center;
    animation: slideInDown 0.3s ease-out;
}

.draw-confirm-header h3 {
    margin: 0 0 var(--spacing-4) 0;
    color: var(--color-primary);
    font-size: var(--font-size-lg);
}

.draw-confirm-body {
    margin-bottom: var(--spacing-6);
}

.draw-confirm-body p {
    margin: 0;
    font-size: var(--font-size-md);
    color: var(--color-text);
    line-height: 1.5;
}

.draw-confirm-buttons {
    display: flex;
    gap: var(--spacing-3);
    justify-content: center;
}

.draw-confirm-buttons .btn {
    min-width: 100px;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-md);
}

/* 動畫效果 */
@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 按鈕尺寸變體 */
.btn.sm {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
}

.btn.lg {
    padding: var(--spacing-4) var(--spacing-10);
    font-size: var(--font-size-lg);
}

/* 按鈕載入狀態 */
.btn.loading {
    position: relative;
    color: transparent;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 模態框組件 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 99999;
    backdrop-filter: blur(4px);
    animation: modalFadeIn var(--transition-normal);
    overflow: hidden;
    isolation: isolate;
}

/* 防止背景滾動 */
body.modal-open {
    overflow: hidden;
    position: relative;
    height: 100vh;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        backdrop-filter: blur(0px);
    }
    to {
        opacity: 1;
        backdrop-filter: blur(4px);
    }
}

.modal-content {
    background: var(--color-surface);
    padding: var(--spacing-6);
    border-radius: var(--radius-4xl);
    box-shadow: var(--shadow-2xl);
    max-width: 480px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    z-index: 100000;
    animation: modalSlideIn var(--transition-normal);
    border: 1px solid var(--color-border);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-6);
    padding-bottom: var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin: 0;
}

.close {
    position: absolute;
    top: var(--spacing-4);
    right: var(--spacing-6);
    font-size: var(--font-size-3xl);
    cursor: pointer;
    color: var(--color-text-muted);
    background: none;
    border: none;
    padding: var(--spacing-2);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.close:hover {
    color: var(--color-text-primary);
    background: var(--color-border);
}

.close:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-shadow-focus);
}

.game-main {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.game-container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
    align-items: start;
}

.game-board-container {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    text-align: center;
}

#game-board {
    border: 2px solid #4a5568;
    border-radius: 10px;
    cursor: crosshair;
    background: #f7fafc;
    touch-action: none; /* 防止觸控時的默認行為 */
    user-select: none; /* 防止文本選擇 */
}

.game-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.player-info {
    background: rgba(255, 255, 255, 0.95);
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.player {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    margin: 0.5rem 0;
    border-radius: 10px;
    background: #f7fafc;
}

.player.active {
    background: #e6fffa;
    border: 2px solid #38b2ac;
}

.player-piece {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid #4a5568;
}

.player.black .player-piece {
    background: #2d3748;
}

.player.white .player-piece {
    background: white;
}

.move-history, .ai-analysis, .suggestions, .chat-area {
    background: rgba(255, 255, 255, 0.95);
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

#game-controls {
    margin-top: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    align-items: center;
}

.difficulty-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 10px;
    backdrop-filter: blur(5px);
}

.difficulty-selector label {
    color: #4a5568;
    font-weight: 600;
    font-size: 0.9rem;
}

.difficulty-selector select {
    padding: 0.5rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    background: white;
    color: #4a5568;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.difficulty-selector select:hover {
    border-color: #4299e1;
}

.difficulty-selector select:focus {
    outline: none;
    border-color: #4299e1;
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.1);
}

/* 卡片內表單樣式 */
.ai-difficulty-home {
    margin: var(--spacing-6) 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    align-items: center;
    background: rgba(255, 255, 255, 0.5);
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(5px);
}

.ai-difficulty-home label {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.ai-difficulty-home select {
    padding: var(--spacing-3) var(--spacing-4);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-normal);
    min-width: 140px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.ai-difficulty-home select:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(66, 153, 225, 0.2);
    transform: translateY(-1px);
}

.ai-difficulty-home select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-shadow-focus), 0 4px 12px rgba(66, 153, 225, 0.2);
}

.move-history h4, .ai-analysis h4, .suggestions h4, .chat-area h4, .ai-status h4 {
    margin-bottom: 1rem;
    color: #4a5568;
}

#moves-list {
    max-height: 200px;
    overflow-y: auto;
}

/* AI 狀態窗格樣式 */
.ai-status {
    background: white;
    border-radius: 12px;
    padding: 1rem;
    margin: 1rem 0;
    color: #4a5568;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border: 1px solid #e2e8f0;
}

.ai-status h4 {
    color: #4a5568 !important;
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

#ai-status-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.status-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.25rem 0;
}

.status-label {
    font-weight: 500;
    color: #718096;
}

#ai-current-status {
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    background: #f7fafc;
    border: 1px solid #e2e8f0;
    min-width: 60px;
    text-align: center;
    font-size: 0.9rem;
    color: #4a5568;
}

#ai-thinking-time {
    font-weight: 600;
    color: #2d3748;
    font-family: 'Courier New', monospace;
    background: #f7fafc;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    border: 1px solid #e2e8f0;
}

/* AI 狀態動畫 */
.ai-thinking {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* 聊天室樣式 */
.chat-messages-container {
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 0.75rem;
    background: #f8fafc;
}

.chat-message {
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    border-radius: 6px;
    background: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.chat-message.system-message {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    font-style: italic;
}

.chat-user {
    font-weight: 600;
    color: #4299e1;
    margin-right: 0.5rem;
}

.chat-text.system-text {
    color: #92400e;
    font-weight: 500;
}

.chat-text {
    color: #2d3748;
}

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

.chat-input input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    font-size: 0.9rem;
}

.chat-input button {
    padding: 0.5rem 1rem;
    background: #4299e1;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.chat-input button:hover {
    background: #3182ce;
}

.move-item {
    padding: 0.5rem;
    margin: 0.25rem 0;
    background: #f7fafc;
    border-radius: 5px;
    font-size: 0.9rem;
}

.footer {
    text-align: center;
    padding: 2rem;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 3rem;
}

/* ===== 響應式設計 ===== */

/* 小螢幕 (手機) */
@media (max-width: 640px) {
    .container {
        padding: 0 var(--spacing-3);
    }
    
    .main {
        padding: var(--spacing-4);
    }
    
    .header {
        flex-direction: column;
        gap: var(--spacing-4);
        padding: var(--spacing-4);
    }
    
    .header h1 {
        font-size: var(--font-size-2xl);
    }
    
    .welcome-section h2 {
        font-size: var(--font-size-3xl);
    }
    
    .welcome-section p {
        font-size: var(--font-size-lg);
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
    
    .game-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
    
    #game-board {
        width: 100%;
        height: auto;
        max-width: 400px;
        touch-action: none; /* 防止觸控時的默認行為 */
        user-select: none; /* 防止文本選擇 */
    }
    
    .modal-content {
        margin: var(--spacing-4);
        padding: var(--spacing-6);
    }
    
    .btn {
        padding: var(--spacing-3) var(--spacing-6);
        font-size: var(--font-size-sm);
    }
}

/* 中等螢幕 (平板) */
@media (min-width: 641px) and (max-width: 768px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .game-container {
        grid-template-columns: 1fr 250px;
    }
}

/* 大螢幕 (桌面) */
@media (min-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .game-container {
        grid-template-columns: 1fr 300px;
    }
}

/* 超大螢幕 */
@media (min-width: 1280px) {
    .feature-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ===== 工具類樣式 ===== */

/* 文字樣式 */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }
.text-5xl { font-size: var(--font-size-5xl); }

.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-white { color: var(--color-text-white); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }
.text-info { color: var(--color-info); }

/* 背景樣式 */
.bg-primary { background-color: var(--color-primary); }
.bg-secondary { background-color: var(--color-secondary); }
.bg-success { background-color: var(--color-success); }
.bg-warning { background-color: var(--color-warning); }
.bg-danger { background-color: var(--color-danger); }
.bg-info { background-color: var(--color-info); }
.bg-surface { background-color: var(--color-surface); }

/* 邊框樣式 */
.border { border: 1px solid var(--color-border); }
.border-2 { border: 2px solid var(--color-border); }
.border-primary { border-color: var(--color-primary); }
.border-success { border-color: var(--color-success); }
.border-warning { border-color: var(--color-warning); }
.border-danger { border-color: var(--color-danger); }

/* 圓角樣式 */
.rounded-xs { border-radius: var(--radius-xs); }
.rounded-sm { border-radius: var(--radius-sm); }
.rounded { border-radius: var(--radius-md); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-3xl { border-radius: var(--radius-3xl); }
.rounded-4xl { border-radius: var(--radius-4xl); }
.rounded-full { border-radius: var(--radius-full); }

/* 陰影樣式 */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }
.shadow-2xl { box-shadow: var(--shadow-2xl); }
.shadow-none { box-shadow: none; }

/* 間距樣式 */
.p-1 { padding: var(--spacing-1); }
.p-2 { padding: var(--spacing-2); }
.p-3 { padding: var(--spacing-3); }
.p-4 { padding: var(--spacing-4); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }

.px-1 { padding-left: var(--spacing-1); padding-right: var(--spacing-1); }
.px-2 { padding-left: var(--spacing-2); padding-right: var(--spacing-2); }
.px-3 { padding-left: var(--spacing-3); padding-right: var(--spacing-3); }
.px-4 { padding-left: var(--spacing-4); padding-right: var(--spacing-4); }
.px-6 { padding-left: var(--spacing-6); padding-right: var(--spacing-6); }
.px-8 { padding-left: var(--spacing-8); padding-right: var(--spacing-8); }

.py-1 { padding-top: var(--spacing-1); padding-bottom: var(--spacing-1); }
.py-2 { padding-top: var(--spacing-2); padding-bottom: var(--spacing-2); }
.py-3 { padding-top: var(--spacing-3); padding-bottom: var(--spacing-3); }
.py-4 { padding-top: var(--spacing-4); padding-bottom: var(--spacing-4); }
.py-6 { padding-top: var(--spacing-6); padding-bottom: var(--spacing-6); }
.py-8 { padding-top: var(--spacing-8); padding-bottom: var(--spacing-8); }

.m-1 { margin: var(--spacing-1); }
.m-2 { margin: var(--spacing-2); }
.m-3 { margin: var(--spacing-3); }
.m-4 { margin: var(--spacing-4); }
.m-6 { margin: var(--spacing-6); }
.m-8 { margin: var(--spacing-8); }

.mx-auto { margin-left: auto; margin-right: auto; }
.my-auto { margin-top: auto; margin-bottom: auto; }

/* 顯示樣式 */
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.grid { display: grid; }
.hidden { display: none; }

/* 位置樣式 */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

/* 寬度和高度 */
.w-full { width: 100%; }
.h-full { height: 100%; }
.w-auto { width: auto; }
.h-auto { height: auto; }

/* 載入動畫 */
.loading {
    font-size: var(--font-size-3xl);
    animation: pulse 2s infinite;
    color: var(--color-text-muted);
}

.waiting-controls {
    margin-top: var(--spacing-6);
    display: flex;
    justify-content: center;
    gap: var(--spacing-4);
}

@keyframes pulse {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
    }
    50% { 
        opacity: 0.5; 
        transform: scale(1.1);
    }
}

/* 淡入動畫 */
.fade-in {
    animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* 滑入動畫 */
.slide-up {
    animation: slideUp var(--transition-normal);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 旋轉動畫 */
.rotate {
    animation: rotate 1s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* 斷線倒計時樣式 */
.disconnect-countdown {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 193, 7, 0.95);
    color: #856404;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    z-index: 10000;
    text-align: center;
    border: 3px solid #ffc107;
    animation: pulse 1s infinite;
}

.countdown-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.countdown-timer {
    font-size: 3rem;
    font-weight: bold;
    color: #dc3545;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    animation: bounce 1s infinite;
}

.countdown-text {
    font-size: 1.2rem;
    font-weight: 600;
}

@keyframes pulse {
    0% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.05); }
    100% { transform: translate(-50%, -50%) scale(1); }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* 連接狀態指示器樣式 */
.connection-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    animation: pulse-dot 2s infinite;
}

.status-dot.online {
    background-color: #28a745;
}

.status-dot.offline {
    background-color: #dc3545;
}

.status-dot.reconnecting {
    background-color: #ffc107;
}

.status-text {
    font-weight: 500;
}

@keyframes pulse-dot {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes slideOutRight {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}

/* 遊戲結束彈窗樣式 */
.game-over-content {
    max-width: 500px;
    width: 90%;
    text-align: center;
    padding: 3rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 20px;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.3);
    border: none;
}

.game-result h2 {
    margin-bottom: 1rem;
    font-size: 2.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.game-result #game-result-icon {
    font-size: 4rem;
    margin: 1rem 0;
    animation: bounce 1s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

.game-result p {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

#game-stats {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 1rem;
    margin: 1.5rem 0;
    backdrop-filter: blur(10px);
}

#game-stats p {
    margin: 0.5rem 0;
    font-size: 1rem;
    opacity: 0.9;
}

.game-over-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.game-over-buttons .btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 120px;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 15px;
    transition: all 0.3s ease;
    text-decoration: none;
    border: none;
    cursor: pointer;
    position: relative;
    z-index: 10; /* 確保按鈕在最上層 */
}

.game-over-buttons .btn.primary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.game-over-buttons .btn.primary:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.game-over-buttons .btn.secondary {
    background: rgba(0, 0, 0, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.game-over-buttons .btn.secondary:hover {
    background: rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* 勝利特效 */
.winner-effect {
    position: relative;
    overflow: hidden;
}

.winner-effect::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 215, 0, 0.3), transparent);
    animation: shine 2s infinite;
    z-index: -1; /* 確保特效在按鈕下方 */
    pointer-events: none; /* 確保特效不會阻擋點擊 */
}

@keyframes shine {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* 表單組件 */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.form-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

/* 優化的表單輸入樣式 */
.form-input {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-2xl);
    font-size: var(--font-size-base);
    font-family: inherit;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal);
    background: var(--color-surface);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-sm);
    position: relative;
    margin-bottom: 0;
    box-sizing: border-box;
    min-height: 44px;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(66, 153, 225, 0.1), var(--shadow-lg);
    transform: translateY(-1px);
    background: var(--color-surface-hover);
}

.form-input:hover:not(:focus) {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.form-input:invalid {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 4px rgba(229, 62, 62, 0.1);
}

.form-input:valid:not(:placeholder-shown) {
    border-color: var(--color-success);
    box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.1);
}

.form-input::placeholder {
    color: var(--color-text-muted);
    font-weight: var(--font-weight-normal);
    transition: all var(--transition-fast);
}

.form-input:focus::placeholder {
    color: var(--color-text-muted);
    transform: translateY(-2px);
    font-size: var(--font-size-sm);
}

/* 登入/註冊表單特殊樣式 */
#auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
}

#auth-form input {
    position: relative;
    padding-left: var(--spacing-12);
    background-image: none;
    background-repeat: no-repeat;
    background-position: var(--spacing-4) center;
    background-size: 20px 20px;
}

#username {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: var(--spacing-4) center;
    background-size: 20px 20px;
    padding-left: var(--spacing-12);
    padding-right: var(--spacing-4);
}

#email {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M16 12a4 4 0 10-8 0 4 4 0 008 0zm0 0v1.5a2.5 2.5 0 005 0V12a9 9 0 10-9 9m4.5-1.206a8.959 8.959 0 01-4.5 1.207'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: var(--spacing-4) center;
    background-size: 20px 20px;
    padding-left: var(--spacing-12);
    padding-right: var(--spacing-4);
}

#password {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: var(--spacing-4) center;
    background-size: 20px 20px;
    padding-left: var(--spacing-12);
    padding-right: var(--spacing-4);
}


/* 表單驗證狀態 */
.form-group {
    position: relative;
    margin-bottom: var(--spacing-4);
    min-height: 60px;
}

.form-group.error input {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 4px rgba(229, 62, 62, 0.1);
}

.form-group.success input {
    border-color: var(--color-success);
    box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.1);
}

.form-error {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    color: var(--color-danger);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-3);
    background: var(--color-danger-light);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-danger);
    animation: slideDown var(--transition-normal);
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.form-success {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    color: var(--color-success);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-1);
    padding: var(--spacing-2);
    background: var(--color-success-light);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-success);
    animation: slideDown var(--transition-normal);
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

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

/* 輸入框動畫效果 */
.form-input:focus {
    animation: inputFocus var(--transition-normal);
}

@keyframes inputFocus {
    0% {
        transform: translateY(0) scale(1);
    }
    50% {
        transform: translateY(-2px) scale(1.02);
    }
    100% {
        transform: translateY(-1px) scale(1);
    }
}

/* 響應式設計 */
@media (max-width: 768px) {
    .form-input {
        padding: var(--spacing-3) var(--spacing-4);
        font-size: var(--font-size-sm);
    }
    
    #auth-form input {
        padding-left: var(--spacing-10);
        background-size: 18px 18px;
        background-position: var(--spacing-3) center;
    }
}

.form-select {
    padding: var(--spacing-3);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-2xl);
    font-size: var(--font-size-base);
    font-family: inherit;
    background: var(--color-surface);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.form-select:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-shadow-focus);
}

.form-textarea {
    padding: var(--spacing-3);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-2xl);
    font-size: var(--font-size-base);
    font-family: inherit;
    resize: vertical;
    min-height: 100px;
    transition: all var(--transition-fast);
    background: var(--color-surface);
    color: var(--color-text-primary);
}

.form-textarea:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-shadow-focus);
}

/* 表單驗證狀態 */
.form-error {
    color: var(--color-danger);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-1);
}

.form-success {
    color: var(--color-success);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-1);
}

/* 表單按鈕組 */
.form-actions {
    display: flex;
    gap: var(--spacing-3);
    justify-content: flex-end;
    margin-top: var(--spacing-6);
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--color-border);
}

/* ===== 房間代號輸入樣式 ===== */
.join-room-container {
    margin-top: var(--spacing-6);
    padding: var(--spacing-6);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    border-radius: var(--radius-3xl);
    border: 2px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    animation: slideDown var(--transition-normal);
}

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

.room-input-group {
    display: flex;
    gap: var(--spacing-3);
    align-items: center;
    margin-bottom: var(--spacing-4);
    flex-wrap: wrap;
}

.room-code-input {
    flex: 1;
    min-width: 200px;
    padding: var(--spacing-4) var(--spacing-6);
    border: 3px solid var(--color-border);
    border-radius: var(--radius-2xl);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    text-align: center;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    background: var(--color-surface);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    font-family: 'Courier New', monospace;
}

.room-code-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-shadow-focus), var(--shadow-xl);
    transform: translateY(-2px);
    background: var(--color-surface-hover);
}

.room-code-input::placeholder {
    color: var(--color-text-muted);
    font-weight: var(--font-weight-normal);
    letter-spacing: normal;
    text-transform: none;
}

.room-code-input:invalid {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 4px rgba(229, 62, 62, 0.1);
}

.room-join-btn {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    border-radius: var(--radius-2xl);
    min-width: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.room-join-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-2xl);
}

.room-join-btn:active {
    transform: translateY(-1px);
}

.room-code-hint {
    text-align: center;
    padding: var(--spacing-3);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.room-code-hint p {
    margin: 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* 房間代號輸入動畫效果 */
.room-code-input:focus + .room-join-btn {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: var(--shadow-lg);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(66, 153, 225, 0.1), var(--shadow-lg);
    }
}

/* 排行榜樣式 */
.leaderboard-main {
    padding: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.leaderboard-container {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.search-section {
    margin-bottom: 2rem;
}

#search-input {
    width: 100%;
    max-width: 400px;
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: 25px;
    font-size: 1rem;
}

.leaderboard-table table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.leaderboard-table th,
.leaderboard-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #e2e8f0;
}

.leaderboard-table th {
    background: #f7fafc;
    font-weight: 600;
    color: #4a5568;
}

.leaderboard-table tr:hover {
    background: #f7fafc;
}

/* 房間等待區域樣式 */
.waiting-area {
    text-align: center;
    padding: 2rem;
}

.waiting-area h2 {
    color: #4a5568;
    margin-bottom: 1rem;
}

.share-section {
    margin-bottom: 2rem;
}

.share-section p {
    color: #718096;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.share-section strong {
    color: #2d3748;
    font-size: 1.2rem;
    background: #f7fafc;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 2px solid #e2e8f0;
    display: inline-block;
    margin: 0 0.5rem;
}

.url-section {
    margin-top: 1.5rem;
}

.url-section label {
    display: block;
    color: #4a5568;
    font-weight: 500;
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.url-input-group {
    display: flex;
    gap: 0.5rem;
    max-width: 500px;
    margin: 0 auto;
    align-items: center;
}

.url-input {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 0.9rem;
    background: #f7fafc;
    color: #4a5568;
    font-family: 'Courier New', monospace;
}

.url-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.copy-btn {
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.copy-btn:active {
    transform: translateY(0);
}

.copy-btn.copied {
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
}

.copy-btn.copied #copy-icon::before {
    content: '✓';
}

.waiting-controls {
    margin-top: 2rem;
}

.loading {
    font-size: 2rem;
    margin: 1rem 0;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* 響應式房間樣式 */
@media (max-width: 768px) {
    .url-input-group {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .copy-btn {
        width: 100%;
        justify-content: center;
    }
}
}