/* 全局样式 */
:root {
    --primary-color: #ff4500; /* Reddit橙色 */
    --secondary-color: #0079d3; /* Reddit蓝色 */
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-color: #1a1a1b;
    --text-light: #7c7c7c;
    --border-color: #edeff1;
    --success-color: #46b955;
    --error-color: #ea0027;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
header {
    margin-bottom: 30px;
    text-align: center;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

nav {
    margin-top: 15px;
}

nav a {
    color: var(--secondary-color);
    text-decoration: none;
    margin: 0 10px;
    font-weight: 500;
}

nav a:hover {
    text-decoration: underline;
}

/* 卡片样式 */
.card-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.card {
    background-color: var(--card-background);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 25px;
    width: 300px;
    text-align: center;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card h2 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.card p {
    color: var(--text-light);
    margin-bottom: 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    background-color: var(--secondary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 4px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #005fa3;
}

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

.btn-primary:hover {
    background-color: #e03d00;
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

input, select, textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 16px;
}

textarea {
    resize: vertical;
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-start;
}

/* 上传页面样式 */
.upload-container {
    background-color: var(--card-background);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 30px;
    max-width: 800px;
    margin: 0 auto;
}

.instructions {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.result-container {
    margin-top: 30px;
    padding: 20px;
    border-radius: 4px;
    background-color: #f0f7ff;
}

.result-container.success {
    background-color: #edf7ed;
    border: 1px solid var(--success-color);
}

.result-container.error {
    background-color: #fdeded;
    border: 1px solid var(--error-color);
}

.hidden {
    display: none;
}

/* 仪表盘样式 */
.dashboard-container {
    background-color: var(--card-background);
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 30px;
}

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 30px;
    align-items: flex-end;
}

.filters .form-group {
    flex: 1;
    min-width: 200px;
    margin-bottom: 0;
}

.metrics-summary {
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.metric-card {
    background-color: #f5f7f9;
    border-radius: 8px;
    padding: 20px;
    flex: 1;
    min-width: 200px;
    text-align: center;
}

.metric-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.charts-container {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 30px;
}

.chart-wrapper {
    flex: 1;
    min-width: 300px;
    background-color: #f5f7f9;
    border-radius: 8px;
    padding: 20px;
}

.data-table-container {
    margin-top: 30px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.data-table th, .data-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: #f5f7f9;
    font-weight: 600;
}

.data-table tbody tr:hover {
    background-color: #f5f7f9;
}

/* 页脚样式 */
footer {
    margin-top: 50px;
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .card {
        width: 100%;
    }
    
    .filters {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filters .form-group {
        margin-bottom: 15px;
    }
    
    .metrics-summary {
        flex-direction: column;
    }
    
    .charts-container {
        flex-direction: column;
    }
    
    .data-table {
        display: block;
        overflow-x: auto;
    }
}