/* 根变量 */
:root {
    /* AI风格颜色 */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warning-gradient: linear-gradient(135deg, #ffeaa7 0%, #fab1a0 100%);
    --info-gradient: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    
    /* 深色主题 */
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1e1e1e;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    
    /* 文字颜色 */
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #666666;
    
    /* 边框和分割线 */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, #667eea, #764ba2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(45deg, #764ba2, #667eea);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-brand i {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.5rem;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.lang-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: var(--transition-fast);
}

.lang-selector:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.lang-selector i {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.lang-selector select {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    font-family: var(--font-family);
}

.lang-selector select option {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* 主内容区 */
.main-content {
    padding-top: 90px;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

/* 英雄区域 */
.hero-section {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-lg);
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.gradient-icon {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: float 3s ease-in-out infinite;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

/* 动画 */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

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

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

/* 卡片组件 */
.panel-card, .progress-card, .stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    backdrop-filter: blur(20px);
    transition: var(--transition-normal);
    animation: slideIn 0.6s ease;
}

.panel-card:hover, .progress-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* 控制面板 */
.control-panel {
    margin-bottom: var(--spacing-lg);
}

.panel-card {
    padding: var(--spacing-lg);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.panel-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.config-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

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

.input-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.input-group textarea {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-sm);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.9rem;
    resize: vertical;
    transition: var(--transition-fast);
    min-height: 120px;
}

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

.input-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
}

/* 按钮样式 */
.btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-normal);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.btn-success {
    background: var(--success-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-warning {
    background: var(--warning-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-warning:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-info {
    background: var(--info-gradient);
    color: #333;
    box-shadow: var(--shadow-md);
}

.btn-info:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-large {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    border-radius: 12px;
}

/* 操作面板 */
.action-panel {
    margin-bottom: var(--spacing-lg);
}

.action-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    align-items: center;
}

/* 翻译控件 */
.translate-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.translate-lang-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: var(--transition-fast);
}

.translate-lang-selector:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
}

.translate-lang-selector label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
}

.translate-lang-selector select {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    font-family: var(--font-family);
    min-width: 150px;
}

.translate-lang-selector select option {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* 进度区域 */
.progress-section {
    margin-bottom: var(--spacing-lg);
}

.progress-card {
    padding: var(--spacing-lg);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.progress-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.progress-stats {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.progress-stats .stat {
    display: flex;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
}

.progress-stats .stat span:last-child {
    font-weight: 600;
    color: #667eea;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    border-radius: 4px;
    transition: width var(--transition-normal);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: progress-shine 2s ease-in-out infinite;
}

@keyframes progress-shine {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

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

.current-keyword span:last-child {
    color: var(--text-primary);
    font-weight: 500;
}

/* 结果区域 */
.results-section {
    margin-bottom: var(--spacing-lg);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.results-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.results-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: var(--spacing-sm);
    color: var(--text-muted);
}

.search-box input {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-xs) var(--spacing-sm) var(--spacing-xs) 2.5rem;
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition-fast);
    min-width: 200px;
}

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

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.result-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-md);
    transition: var(--transition-normal);
    animation: slideIn 0.6s ease;
}

.result-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.result-card.translated {
    border-color: #a8edea;
    box-shadow: 0 0 10px rgba(168, 237, 234, 0.2);
}

.result-keyword {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.result-keyword .keyword-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.result-suggestions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.suggestion-item {
    padding: var(--spacing-xs);
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-size: 0.9rem;
    transition: var(--transition-fast);
    border-left: 3px solid transparent;
}

.suggestion-item:hover {
    background: var(--bg-card-hover);
    border-left-color: #667eea;
}

.suggestion-english {
    color: var(--text-primary);
    font-weight: 500;
}

.suggestion-translation {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 2px;
    display: none;
}

.suggestion-translation.show {
    display: block;
}

/* 统计面板 */
.stats-section {
    margin-bottom: var(--spacing-lg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.stat-card {
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: var(--transition-normal);
}

.stat-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.stat-content {
    flex: 1;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* 加载遮罩 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border-color);
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

.loading-text {
    color: var(--text-primary);
    font-size: 1rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-content {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
    
    .nav-container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-title {
        font-size: 2rem;
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .panel-header, .results-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .panel-actions, .results-controls {
        justify-content: center;
    }
    
    .input-row {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .translate-controls {
        flex-direction: column;
        width: 100%;
        align-items: center;
    }
    
    .translate-lang-selector {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .btn-large {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .progress-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .progress-stats {
        justify-content: space-between;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .search-box input {
        min-width: 150px;
    }
}

@media (max-width: 480px) {
    .nav-brand span {
        display: none;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .results-controls {
        flex-direction: column;
        width: 100%;
    }
    
    .search-box {
        width: 100%;
    }
    
    .search-box input {
        width: 100%;
        min-width: auto;
    }
    
    .action-buttons {
        grid-template-columns: 1fr;
        width: 100%;
    }
    
    .action-buttons .btn-large {
        max-width: none;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --border-color: rgba(255, 255, 255, 0.3);
        --bg-card: rgba(255, 255, 255, 0.1);
    }
}

/* 减少动画模式支持 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}