/* AI资讯网站样式 - 修复版 */

/* CSS变量定义 */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    --light-bg: #f8fafc;
    --light-card: #ffffff;
    --light-text: #1e293b;
    --light-muted: #64748b;
    --light-border: #e2e8f0;
    
    --dark-bg: #0f172a;
    --dark-card: #1e293b;
    --dark-text: #f1f5f9;
    --dark-muted: #94a3b8;
    --dark-border: #334155;
    
    --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);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    --transition-fast: 150ms;
    --transition-normal: 300ms;
    --transition-slow: 500ms;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--dark-bg);
    color: var(--dark-text);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-normal);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 导航栏 */
.navbar {
    background: var(--dark-card);
    border-bottom: 1px solid var(--dark-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(30, 41, 59, 0.95);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
}

.nav-brand {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.ai-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.ai-logo i {
    font-size: 1.75rem;
}

.nav-tagline {
    font-size: 0.875rem;
    color: var(--dark-muted);
    font-weight: 400;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--dark-muted);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
}

.nav-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* 按钮样式 */
.btn {
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--dark-text);
    border: 1px solid var(--dark-border);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-refresh {
    background: var(--dark-card);
    color: var(--dark-text);
    border: 1px solid var(--dark-border);
}

.btn-refresh:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.btn-refresh.loading i {
    animation: spin 1s linear infinite;
}

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

/* 英雄区域 */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.05) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.125rem;
    color: var(--dark-muted);
    margin-bottom: 2rem;
    max-width: 500px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
}

.stat-card {
    background: var(--dark-card);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--dark-border);
    transition: transform var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--dark-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* 控制面板 */
.control-panel {
    background: var(--dark-card);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin: 2rem 0;
    border: 1px solid var(--dark-border);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

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

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

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

.control-item label {
    font-size: 0.875rem;
    color: var(--dark-muted);
    font-weight: 500;
}

.select-control {
    background: var(--dark-bg);
    border: 1px solid var(--dark-border);
    color: var(--dark-text);
    padding: 0.625rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    width: 100%;
}

.select-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 资讯网格 */
.news-section {
    margin: 3rem 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.news-card {
    background: var(--dark-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--dark-border);
    transition: all var(--transition-normal);
}

.news-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-xl);
}

.news-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--dark-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.news-category {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.news-time {
    font-size: 0.875rem;
    color: var(--dark-muted);
}

.news-body {
    padding: 1.5rem;
}

.news-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.news-summary {
    color: var(--dark-muted);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.news-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--dark-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.05);
}

.news-source {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--dark-muted);
    font-size: 0.875rem;
}

.news-actions {
    display: flex;
    gap: 0.75rem;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--dark-muted);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

/* 趋势分析 */
.trends-section {
    margin: 3rem 0;
}

.trends-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.trend-card {
    background: var(--dark-card);
    border-radius: var(--radius-lg);
    padding: 2rem;
    border: 1px solid var(--dark-border);
}

.trend-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.trend-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.trend-tag {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.trend-tag:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

/* API状态 */
.api-status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
}

.api-status.connected {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-color);
}

.api-status.disconnected {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

/* 页脚 */
.footer {
    background: var(--dark-card);
    border-top: 1px solid var(--dark-border);
    padding: 3rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand .ai-logo {
    margin-bottom: 1rem;
}

.footer-desc {
    color: var(--dark-muted);
    line-height: 1.6;
    max-width: 400px;
}

.footer-links h4,
.footer-info h4 {
    color: var(--dark-text);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-links ul,
.footer-info ul {
    list-style: none;
}

.footer-links li,
.footer-info li {
    color: var(--dark-muted);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-info li i {
    color: var(--primary-color);
    width: 20px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--dark-muted);
    font-size: 0.9rem;
}

.footer-stats {
    display: flex;
    gap: 2rem;
}

.footer-stats span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-stats i {
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .hero {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .panel-controls {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .trends-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .panel-controls {
        grid-template-columns: 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .footer-stats {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .nav-actions {
        flex-direction: column;
        gap: 1rem;
        width: 100%;
    }
    
    .btn-refresh {
        width: 100%;
        justify-content: center;
    }
}

/* 工具类 */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 10px;
}

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

::-webkit-scrollbar-thumb {