:root {
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-tertiary: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #4a9eff;
    --accent-hover: #6bb3ff;
    --border: #3d3d3d;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s ease;
}

* {
    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(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header Styles */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    padding: 20px 0;
}

.nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
    letter-spacing: -0.5px;
}

.logo:hover {
    opacity: 0.85;
}

.logo .letter-s { color: #4a9eff; }
.logo .letter-y { color: #a78bfa; }
.logo .letter-n { color: #34d399; }
.logo .letter-a { color: #f472b6; }
.logo .letter-p { color: #fbbf24; }
.logo .letter-s2 { color: #f87171; }
.logo .letter-e { color: #22d3ee; }
.logo .letter-space { color: var(--text-secondary); }
.logo .letter-ai { color: #4a9eff; font-weight: 600; }

.search-container {
    display: flex;
    align-items: center;
}

#search-input {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px 0 0 4px;
    color: var(--text-primary);
    padding: 8px 12px;
    width: 200px;
    transition: var(--transition);
}

#search-input:focus {
    outline: none;
    border-color: var(--accent);
    width: 250px;
}

#search-btn {
    background-color: var(--accent);
    border: none;
    border-radius: 0 4px 4px 0;
    color: white;
    cursor: pointer;
    padding: 8px 12px;
    transition: var(--transition);
}

#search-btn:hover {
    background-color: var(--accent-hover);
}

/* Main Content Styles */
.main {
    padding: 32px 0;
}

/* Articles List Styles */
.articles-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.article-card {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: var(--transition);
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow);
}

.article-card a {
    color: var(--text-primary);
    text-decoration: none;
    display: block;
    padding: 20px;
}

.article-card h2 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    transition: var(--transition);
}

.article-card:hover h2 {
    color: var(--accent);
}

.article-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.article-excerpt {
    color: var(--text-secondary);
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more {
    color: var(--accent);
    font-weight: 500;
    transition: var(--transition);
}

.read-more:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* Pagination Styles */
.pagination {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 40px;
}

.pagination-btn {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px 16px;
    transition: var(--transition);
}

.pagination-btn:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--accent);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

/* Article Detail Styles */
.article-content {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border);
    padding: 28px;
}

.article-content h1 {
    font-size: 2rem;
    margin-bottom: 16px;
}

.article-header {
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

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

.article-nav {
    margin-top: 32px;
    text-align: center;
}

.back-link {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    display: inline-block;
    padding: 8px 16px;
    text-decoration: none;
    transition: var(--transition);
}

.back-link:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--accent);
}

/* Footer Styles */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 32px 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-link {
    color: var(--text-secondary);
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-link:hover {
    color: var(--accent);
}

/* Loading Styles */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

/* Responsive Styles */
@media (max-width: 768px) {
    .nav .container {
        flex-direction: column;
        gap: 16px;
    }
    
    .search-container {
        width: 100%;
    }
    
    #search-input {
        width: 100%;
    }
    
    #search-input:focus {
        width: 100%;
    }
    
    .article-content {
        padding: 24px;
    }
    
    .article-content h1 {
        font-size: 1.8rem;
    }
}

/* Markdown Styles Overrides */
.markdown-body {
    color: var(--text-primary);
}

.markdown-body a {
    color: var(--accent);
}

.markdown-body a:hover {
    color: var(--accent-hover);
}

.markdown-body pre {
    background-color: var(--bg-tertiary) !important;
    position: relative;
}

.markdown-body code {
    background-color: var(--bg-tertiary) !important;
}

.markdown-body blockquote {
    border-left: 4px solid var(--accent);
}

/* Code Copy Button Styles */
.code-copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 12px;
    padding: 4px 8px;
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
}

.markdown-body pre:hover .code-copy-btn {
    opacity: 1;
    visibility: visible;
}

.code-copy-btn:hover {
    background-color: var(--accent);
    color: white;
    border-color: var(--accent);
}

.code-copy-btn.copied {
    background-color: #4caf50;
    border-color: #4caf50;
    color: white;
}

/* Table of Contents Styles */
.toc-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 32px;
    padding: 20px;
}

.toc-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.toc-list {
    list-style-type: none;
}

.toc-list li {
    margin-bottom: 8px;
}

.toc-list a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.toc-list a:hover {
    color: var(--accent);
}

.toc-h2 {
    margin-left: 0;
}

.toc-h3 {
    margin-left: 20px;
}

/* Article With TOC Layout */
.article-with-toc {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 48px;
}

@media (max-width: 1024px) {
    .article-with-toc {
        grid-template-columns: 1fr;
    }
    
    .toc-container {
        position: sticky;
        top: 100px;
    }
}

@media (max-width: 768px) {
    .toc-container {
        position: static;
    }
}

/* Home Layout Styles */
.home-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 48px;
}

.content-section {
    width: 100%;
}

.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

@media (max-width: 1024px) {
    .home-layout {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: static;
        margin-top: 32px;
    }
}

/* 登录界面样式 */
.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 30px;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border);
    box-shadow: var(--card-shadow);
}

.login-title {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 30px;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group textarea {
    resize: vertical;
    min-height: 200px;
}

.login-btn {
    width: 100%;
    padding: 12px;
    background-color: var(--accent);
    border: none;
    border-radius: 4px;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.login-btn:hover {
    background-color: var(--accent-hover);
}

.error-message {
    background-color: #742a2a;
    color: #fed7d7;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
    text-align: center;
}

/* 用户控制按钮 */
.user-controls {
    display: flex;
    gap: 10px;
    align-items: center;
}

.nav-btn {
    padding: 8px 16px;
    background-color: var(--accent);
    border: none;
    border-radius: 4px;
    color: white;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 5px;
}

.nav-btn:hover {
    background-color: var(--accent-hover);
}

/* 文章操作按钮 */
.article-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border);
}

.article-actions button {
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    color: white;
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 5px;
}

.edit-btn {
    background-color: #48bb78;
}

.edit-btn:hover {
    background-color: #38a169;
}

.delete-btn {
    background-color: #f56565;
}

.delete-btn:hover {
    background-color: #e53e3e;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: var(--bg-secondary);
    margin: 10% auto;
    padding: 0;
    border-radius: 8px;
    border: 1px solid var(--border);
    width: 90%;
    max-width: 600px;
    box-shadow: var(--card-shadow);
    animation: modalFadeIn 0.3s;
}

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

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.25rem;
}

.close-btn {
    color: var(--text-secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

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

.modal-body {
    padding: 20px;
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

.cancel-btn {
    padding: 8px 16px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

.cancel-btn:hover {
    background-color: var(--border);
}

.submit-btn {
    padding: 8px 16px;
    background-color: #48bb78;
    border: none;
    border-radius: 4px;
    color: white;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

.submit-btn:hover {
    background-color: #38a169;
}

/* 模态框中的删除按钮样式 */
.modal .confirm-delete-btn {
    padding: 8px 16px;
    background-color: #f56565;
    border: none;
    border-radius: 4px;
    color: white;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

.modal .confirm-delete-btn:hover {
    background-color: #e53e3e;
}

/* 响应式设计调整 */
@media (max-width: 768px) {
    .user-controls {
        flex-direction: column;
        gap: 5px;
        align-items: stretch;
    }
    
    .nav-btn {
        font-size: 0.75rem;
        padding: 6px 12px;
        justify-content: center;
    }
    
    .article-actions {
        flex-direction: column;
    }
    
    .modal-content {
        margin: 20% auto;
        width: 95%;
    }
}