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

:root {
    --sidebar-width: 280px;
    --border-color: #e1e4e8;
    --bg-color: #f6f8fa;
    --text-primary: #24292f;
    --text-secondary: #57606a;
    --hover-bg: #ebf0f4;
    --active-bg: #dbedff;
    --active-border: #54aeff;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    color: var(--text-primary);
    background: var(--bg-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    display: flex;
    min-height: calc(100vh - 80px);
}

.sidebar {
    width: var(--sidebar-width);
    background: white;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.btn-primary {
    width: 100%;
    padding: 10px 16px;
    background: #2da44e;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: #2c974b;
}

.btn-primary:active {
    background: #298e46;
}

.folder-path {
    display: block;
    margin-top: 12px;
    font-size: 12px;
    color: var(--text-secondary);
    word-break: break-all;
}

.file-search {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

.file-search input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.file-search input:focus {
    border-color: var(--active-border);
    box-shadow: 0 0 0 3px rgba(84, 174, 255, 0.1);
}

.file-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.empty-state {
    padding: 32px 16px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.file-item {
    padding: 10px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    border-left: 3px solid transparent;
    transition: background 0.15s, border-color 0.15s;
}

.file-item:hover {
    background: var(--hover-bg);
}

.file-item.active {
    background: var(--active-bg);
    border-left-color: var(--active-border);
}

.file-item svg {
    flex-shrink: 0;
    color: var(--text-secondary);
}

.file-item.md-file {
    font-weight: 500;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.preview {
    flex: 1;
    overflow-y: auto;
    padding: 32px 48px;
    background: white;
    min-height: 400px;
}

.preview-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    gap: 16px;
}

.preview-empty svg {
    opacity: 0.3;
}

.preview-empty p {
    font-size: 16px;
}

/* Preview Toolbar */
.preview-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: white;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.theme-selector {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-selector label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.theme-selector select {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    background: white;
    cursor: pointer;
    transition: border-color 0.2s;
}

.theme-selector select:focus {
    outline: none;
    border-color: var(--active-border);
}

.copy-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: #2da44e;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.copy-btn:hover {
    background: #2c974b;
}

.copy-btn:active {
    background: #298e46;
}

.copy-btn.copied {
    background: #1a7f37;
}

/* Markdown Preview Styles */
.markdown-content {
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.7;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
}

.markdown-content h1 {
    font-size: 2em;
    padding-bottom: 0.3em;
    border-bottom: 1px solid var(--border-color);
}

.markdown-content h2 {
    font-size: 1.5em;
    padding-bottom: 0.3em;
    border-bottom: 1px solid var(--border-color);
}

.markdown-content h3 {
    font-size: 1.25em;
}

.markdown-content p {
    margin-bottom: 16px;
}

.markdown-content a {
    color: #0969da;
    text-decoration: none;
}

.markdown-content a:hover {
    text-decoration: underline;
}

.markdown-content code {
    padding: 0.2em 0.4em;
    margin: 0;
    font-size: 85%;
    background: rgba(175, 184, 193, 0.2);
    border-radius: 6px;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, monospace;
}

.markdown-content pre {
    padding: 16px;
    overflow: auto;
    font-size: 85%;
    line-height: 1.45;
    background: #0d1117;
    border-radius: 6px;
    margin-bottom: 16px;
}

.markdown-content pre code {
    background: transparent;
    padding: 0;
    color: inherit;
}

.markdown-content ul,
.markdown-content ol {
    padding-left: 2em;
    margin-bottom: 16px;
}

.markdown-content li {
    margin: 4px 0;
}

.markdown-content blockquote {
    padding: 0 1em;
    color: var(--text-secondary);
    border-left: 0.25em solid var(--border-color);
    margin: 0 0 16px 0;
}

.markdown-content table {
    border-spacing: 0;
    border-collapse: collapse;
    margin-bottom: 16px;
    width: 100%;
}

.markdown-content table th,
.markdown-content table td {
    padding: 6px 13px;
    border: 1px solid var(--border-color);
}

.markdown-content table th {
    background: var(--bg-color);
    font-weight: 600;
}

.markdown-content img {
    max-width: 100%;
    box-sizing: content-box;
    background: white;
}

.markdown-content hr {
    height: 0.25em;
    padding: 0;
    margin: 24px 0;
    background: var(--border-color);
    border: 0;
}

/* 悬浮回到顶部按钮 */
.floating-back-to-top {
    position: fixed;
    right: 32px;
    bottom: 80px;
    width: 44px;
    height: 44px;
    background: white;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    z-index: 9999;
}

.floating-back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.floating-back-to-top:hover {
    background: #2da44e;
    color: white;
    border-color: #2da44e;
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(45, 164, 78, 0.3);
}

.floating-back-to-top:active {
    transform: translateY(-2px);
}

/* Scrollbar */
.file-list::-webkit-scrollbar,
.preview::-webkit-scrollbar {
    width: 8px;
}

.file-list::-webkit-scrollbar-track,
.preview::-webkit-scrollbar-track {
    background: transparent;
}

.file-list::-webkit-scrollbar-thumb,
.preview::-webkit-scrollbar-thumb {
    background: #d0d7de;
    border-radius: 4px;
}

.file-list::-webkit-scrollbar-thumb:hover,
.preview::-webkit-scrollbar-thumb:hover {
    background: #babbbd;
}

/* Footer */
.footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 16px;
    background: white;
    border-top: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.footer a:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

.footer-divider {
    color: var(--border-color);
}

/* 页面头部样式 */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 24px 20px;
    text-align: center;
    flex-shrink: 0;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
}

.page-title {
    font-size: 28px;
    font-weight: 700;
    color: white;
    margin: 0 0 8px 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.page-description {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
    line-height: 1.5;
}

/* 腾讯广告横幅样式 */
.ad-banner {
    width: 100%;
    height: 120px;
    background: white;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

#ad-banner-container {
    width: 100%;
    max-width: 1200px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 20px;
}

.ad-banner-content {
    display: flex;
    align-items: center;
    gap: 16px;
    width: 100%;
    height: 100%;
    padding: 16px;
    background: #f8f9fa;
    border-radius: 8px;
    box-sizing: border-box;
}

.ad-banner-content .ad-video {
    flex-shrink: 0;
    width: 200px;
    height: 88px;
    display: none;
}

.ad-banner-content .ad-video video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 6px;
}

.ad-banner-content .ad-image {
    flex-shrink: 0;
    width: 200px;
    height: 88px;
}

.ad-banner-content .ad-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 6px;
}

.ad-banner-content .ad-info {
    flex: 1;
    min-width: 0;
}

.ad-banner-content .ad-title-text {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    margin: 0 0 6px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ad-banner-content .ad-description {
    font-size: 14px;
    color: #666;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.ad-banner-content .cta-button {
    flex-shrink: 0;
    padding: 8px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    white-space: nowrap;
}

.ad-banner-content .cta-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.ad-banner-content .advertiser {
    flex-shrink: 0;
    font-size: 12px;
    color: #999;
    margin-left: 8px;
}

.ad-loading {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.ad-error {
    display: none;
    text-align: center;
    color: #f44336;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .page-header {
        padding: 16px 16px;
    }

    .page-title {
        font-size: 20px;
    }

    .page-description {
        font-size: 12px;
    }

    .ad-banner {
        height: 180px;
    }

    .ad-banner-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .ad-banner-content .ad-image,
    .ad-banner-content .ad-video {
        width: 100%;
        height: 80px;
    }

    .ad-banner-content .ad-title-text {
        font-size: 14px;
    }

    .ad-banner-content .ad-description {
        font-size: 12px;
        -webkit-line-clamp: 1;
    }

    .ad-banner-content .cta-button {
        width: 100%;
        text-align: center;
    }

    .sidebar {
        width: 220px;
    }

    .preview {
        padding: 20px;
    }

    .footer {
        font-size: 12px;
        padding: 12px;
    }

    .preview-toolbar {
        flex-direction: column;
        gap: 12px;
        align-items: stretch;
    }

    .copy-btn {
        width: 100%;
        justify-content: center;
    }

    .floating-back-to-top {
        right: 20px;
        bottom: 60px;
        width: 40px;
        height: 40px;
    }
}

/* 主题样式 */
/* 默认主题 */
.preview[data-theme="default"] .markdown-content {
    color: #24292f;
}

.preview[data-theme="default"] .markdown-content h1,
.preview[data-theme="default"] .markdown-content h2 {
    border-bottom-color: #e1e4e8;
}

.preview[data-theme="default"] .markdown-content a {
    color: #0969da;
}

.preview[data-theme="default"] .markdown-content code {
    background: rgba(175, 184, 193, 0.2);
}

.preview[data-theme="default"] .markdown-content pre {
    background: #0d1117;
}

.preview[data-theme="default"] .markdown-content blockquote {
    border-left-color: #e1e4e8;
    color: #57606a;
}

/* 简约主题 */
.preview[data-theme="simple"] {
    background: #fafafa;
}

.preview[data-theme="simple"] .markdown-content {
    color: #333;
}

.preview[data-theme="simple"] .markdown-content h1,
.preview[data-theme="simple"] .markdown-content h2 {
    border-bottom: none;
    font-weight: 500;
}

.preview[data-theme="simple"] .markdown-content h1 {
    font-size: 1.8em;
}

.preview[data-theme="simple"] .markdown-content h2 {
    font-size: 1.4em;
}

.preview[data-theme="simple"] .markdown-content a {
    color: #333;
    text-decoration: underline;
}

.preview[data-theme="simple"] .markdown-content code {
    background: #e8e8e8;
    color: #d63384;
}

.preview[data-theme="simple"] .markdown-content pre {
    background: #f5f5f5;
    border: 1px solid #e0e0e0;
}

.preview[data-theme="simple"] .markdown-content pre code {
    background: transparent;
    color: inherit;
}

.preview[data-theme="simple"] .markdown-content table th {
    background: #f0f0f0;
    border-color: #e0e0e0;
}

.preview[data-theme="simple"] .markdown-content table td {
    border-color: #e0e0e0;
}

/* 护眼绿主题 */
.preview[data-theme="green"] {
    background: #f0f9f4;
}

.preview[data-theme="green"] .markdown-content {
    color: #1a4d2e;
}

.preview[data-theme="green"] .markdown-content h1,
.preview[data-theme="green"] .markdown-content h2 {
    border-bottom-color: #a7d7c5;
    color: #0d5f4a;
}

.preview[data-theme="green"] .markdown-content h1 {
    font-size: 2em;
}

.preview[data-theme="green"] .markdown-content h2 {
    font-size: 1.5em;
}

.preview[data-theme="green"] .markdown-content a {
    color: #0d8a6e;
}

.preview[data-theme="green"] .markdown-content code {
    background: #d1e8dd;
    color: #0d5f4a;
}

.preview[data-theme="green"] .markdown-content pre {
    background: #d1e8dd;
    color: #1a4d2e;
}

.preview[data-theme="green"] .markdown-content pre code {
    background: transparent;
    color: inherit;
}

.preview[data-theme="green"] .markdown-content blockquote {
    border-left-color: #5bc9a8;
    background: #e8f7f1;
    padding: 12px 16px;
}

.preview[data-theme="green"] .markdown-content table th {
    background: #b8ebde;
    border-color: #8bdcc6;
    color: #0d5f4a;
}

.preview[data-theme="green"] .markdown-content table td {
    border-color: #8bdcc6;
}

.preview[data-theme="green"] .markdown-content table tr:nth-child(even) {
    background: #e8f7f1;
}

/* 暗黑主题 */
.preview[data-theme="dark"] {
    background: #0d1117;
}

.preview[data-theme="dark"] .markdown-content {
    color: #c9d1d9;
}

.preview[data-theme="dark"] .markdown-content h1,
.preview[data-theme="dark"] .markdown-content h2 {
    border-bottom-color: #30363d;
    color: #ffffff;
}

.preview[data-theme="dark"] .markdown-content h1 {
    font-size: 2em;
}

.preview[data-theme="dark"] .markdown-content h2 {
    font-size: 1.5em;
}

.preview[data-theme="dark"] .markdown-content p {
    color: #8b949e;
}

.preview[data-theme="dark"] .markdown-content a {
    color: #58a6ff;
}

.preview[data-theme="dark"] .markdown-content code {
    background: rgba(110, 118, 129, 0.4);
    color: #ff7b72;
}

.preview[data-theme="dark"] .markdown-content pre {
    background: #161b22;
    border: 1px solid #30363d;
}

.preview[data-theme="dark"] .markdown-content pre code {
    background: transparent;
    color: #c9d1d9;
}

.preview[data-theme="dark"] .markdown-content blockquote {
    border-left-color: #58a6ff;
    color: #8b949e;
}

.preview[data-theme="dark"] .markdown-content table th {
    background: #161b22;
    border-color: #30363d;
    color: #ffffff;
}

.preview[data-theme="dark"] .markdown-content table td {
    border-color: #30363d;
    color: #c9d1d9;
}

.preview[data-theme="dark"] .markdown-content table tr:nth-child(even) {
    background: #161b22;
}

.preview[data-theme="dark"] .markdown-content hr {
    background: #30363d;
}

/* 微信公众号主题 */
.preview[data-theme="wechat"] {
    background: #ffffff;
}

.preview[data-theme="wechat"] .markdown-content {
    color: #3f3f3f;
    font-size: 16px;
    line-height: 1.8;
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", SimHei, Arial, sans-serif;
}

.preview[data-theme="wechat"] .markdown-content h1 {
    font-size: 22px;
    font-weight: bold;
    color: #3f3f3f;
    border-bottom: 2px solid #07c160;
    padding-bottom: 10px;
    margin-bottom: 20px;
    margin-top: 30px;
}

.preview[data-theme="wechat"] .markdown-content h2 {
    font-size: 18px;
    font-weight: bold;
    color: #3f3f3f;
    border-left: 4px solid #07c160;
    padding-left: 10px;
    margin-top: 25px;
    margin-bottom: 15px;
    border-bottom: none;
    padding-bottom: 0;
}

.preview[data-theme="wechat"] .markdown-content h3 {
    font-size: 16px;
    font-weight: bold;
    color: #3f3f3f;
    margin-top: 20px;
    margin-bottom: 12px;
}

.preview[data-theme="wechat"] .markdown-content p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 15px;
    text-align: justify;
}

.preview[data-theme="wechat"] .markdown-content a {
    color: #576b95;
    text-decoration: none;
}

.preview[data-theme="wechat"] .markdown-content strong {
    color: #3f3f3f;
    font-weight: bold;
}

.preview[data-theme="wechat"] .markdown-content code {
    background: #f5f5f5;
    color: #d63384;
    padding: 3px 6px;
    border-radius: 3px;
    font-size: 14px;
}

.preview[data-theme="wechat"] .markdown-content pre {
    background: #f5f5f5;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    padding: 12px;
    font-size: 14px;
    line-height: 1.6;
}

.preview[data-theme="wechat"] .markdown-content pre code {
    background: transparent;
    color: #333;
    padding: 0;
}

.preview[data-theme="wechat"] .markdown-content blockquote {
    border-left: 4px solid #07c160;
    background: #f5f5f5;
    padding: 12px 16px;
    margin: 15px 0;
    color: #666;
    font-size: 15px;
}

.preview[data-theme="wechat"] .markdown-content ul,
.preview[data-theme="wechat"] .markdown-content ol {
    padding-left: 25px;
    margin-bottom: 15px;
}

.preview[data-theme="wechat"] .markdown-content li {
    margin-bottom: 8px;
    font-size: 16px;
    line-height: 1.8;
}

.preview[data-theme="wechat"] .markdown-content table {
    border: 1px solid #e0e0e0;
    margin: 15px 0;
}

.preview[data-theme="wechat"] .markdown-content table th {
    background: #07c160;
    color: white;
    border-color: #07c160;
    padding: 10px 12px;
}

.preview[data-theme="wechat"] .markdown-content table td {
    border-color: #e0e0e0;
    padding: 10px 12px;
    font-size: 15px;
}

.preview[data-theme="wechat"] .markdown-content table tr:nth-child(even) {
    background: #f9f9f9;
}

.preview[data-theme="wechat"] .markdown-content hr {
    border: none;
    border-top: 1px solid #e0e0e0;
    margin: 25px 0;
}

.preview[data-theme="wechat"] .markdown-content img {
    max-width: 100%;
    border-radius: 4px;
    margin: 15px 0;
}