/**
 * TechBlog - 科技风格样式表
 * 浅色科技风主题
 */

/* 全局变量 */
:root {
    --primary-bg: #f8f9fa;
    --card-bg: #ffffff;
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #e9ecef;
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    --border-radius: 0.375rem;
    --transition: all 0.3s ease;
}

/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-hover);
}

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

/* 导航栏 */
.navbar {
    background: var(--card-bg);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.navbar-nav a {
    color: var(--text-primary);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

.navbar-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.navbar-nav a:hover::after {
    width: 100%;
}

/* 文章列表 */
.posts-grid {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.post-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.post-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.post-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.post-title a {
    color: inherit;
}

.post-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.post-meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.post-excerpt {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.post-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.read-more {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.read-more:hover {
    gap: 0.75rem;
}

/* 文章详情页 */
.post-detail {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: 3rem;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
}

.post-detail-header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
}

.post-detail-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.post-detail-meta {
    display: flex;
    gap: 2rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.post-detail-content {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.post-detail-content h1,
.post-detail-content h2,
.post-detail-content h3,
.post-detail-content h4,
.post-detail-content h5,
.post-detail-content h6 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.post-detail-content h1 { font-size: 2rem; }
.post-detail-content h2 { font-size: 1.75rem; }
.post-detail-content h3 { font-size: 1.5rem; }
.post-detail-content h4 { font-size: 1.25rem; }

.post-detail-content p {
    margin-bottom: 1.5rem;
}

.post-detail-content code {
    background: #f4f4f4;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.post-detail-content pre {
    background: #2d2d2d;
    color: #f4f4f4;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.post-detail-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.post-detail-content ul,
.post-detail-content ol {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

.post-detail-content li {
    margin-bottom: 0.5rem;
}

.post-detail-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--text-secondary);
}

.post-detail-footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* 页脚 */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
}

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

.footer-text {
    font-size: 0.875rem;
}

.icp-info {
    display: flex;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.icp-info a {
    color: var(--text-secondary);
}

.icp-info a:hover {
    color: var(--primary-color);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 3rem 0;
}

.pagination a,
.pagination span {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-primary);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.pagination a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pagination .active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--primary-color);
    color: white;
}

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

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

.btn-success:hover {
    background: #218838;
}

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

.btn-danger:hover {
    background: #c82333;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* 表单 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

/* 消息提示 */
.message {
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.message-success {
    background: #d4edda;
    border-color: var(--success-color);
    color: #155724;
}

.message-error {
    background: #f8d7da;
    border-color: var(--danger-color);
    color: #721c24;
}

.message-warning {
    background: #fff3cd;
    border-color: var(--warning-color);
    color: #856404;
}

/* 响应式 */
@media (max-width: 768px) {
    .navbar-container {
        flex-direction: column;
        gap: 1rem;
    }

    .navbar-nav {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .post-detail {
        padding: 1.5rem;
    }

    .post-detail-title {
        font-size: 2rem;
    }

    .post-detail-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .post-card {
        padding: 1.5rem;
    }

    .post-title {
        font-size: 1.5rem;
    }

    .post-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}