/* ========================================
   Modern Theme - Clean, Blue Accents
   ======================================== */

/* Modern Theme Variables */
.theme-modern,
:root {
    --theme-primary: #2563eb;
    --theme-primary-dark: #1d4ed8;
    --theme-accent: #3b82f6;
    --theme-background: #ffffff;
    --theme-surface: #f8fafc;
    --theme-text: #1e293b;
    --theme-text-light: #64748b;
    --theme-border: #e2e8f0;
    --theme-code-bg: #1e293b;
    --theme-code-text: #e2e8f0;
    --theme-code-border: transparent;
    --theme-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --theme-font-mono: 'Courier New', Courier, monospace;
    --theme-line-height: 1.6;
}

/* Preview Content Styling for Modern Theme */
.preview-content h1,
.preview-content h2,
.preview-content h3,
.preview-content h4,
.preview-content h5,
.preview-content h6 {
    color: var(--theme-text);
    font-weight: 600;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
    line-height: 1.3;
}

.preview-content h1 {
    font-size: 2.25rem;
    border-bottom: 3px solid var(--theme-primary);
    padding-bottom: 0.5rem;
}

.preview-content h2 {
    font-size: 1.875rem;
    border-bottom: 2px solid var(--theme-accent);
    padding-bottom: 0.4rem;
}

.preview-content h3 {
    font-size: 1.5rem;
    color: var(--theme-primary);
}

.preview-content h4 {
    font-size: 1.25rem;
}

.preview-content h5 {
    font-size: 1.125rem;
}

.preview-content h6 {
    font-size: 1rem;
    color: var(--theme-text-light);
}

/* Paragraphs */
.preview-content p {
    margin-bottom: 1em;
    color: var(--theme-text);
    line-height: var(--theme-line-height);
}

/* Links */
.preview-content a {
    color: var(--theme-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.preview-content a:hover {
    border-bottom-color: var(--theme-primary);
}

/* Lists */
.preview-content ul,
.preview-content ol {
    margin: 1em 0;
    padding-left: 2em;
}

.preview-content li {
    margin: 0.5em 0;
    color: var(--theme-text);
}

.preview-content ul > li {
    list-style-type: disc;
}

.preview-content ul ul > li {
    list-style-type: circle;
}

.preview-content ol {
    list-style-type: decimal;
}

/* Code Blocks */
.preview-content code {
    background-color: #f1f5f9;
    color: #e11d48;
    padding: 0.2em 0.4em;
    border-radius: 0.25rem;
    font-family: var(--theme-font-mono);
    font-size: 0.875em;
}

.preview-content pre {
    background-color: var(--code-theme-bg, var(--theme-code-bg));
    color: var(--code-theme-text, var(--theme-code-text));
    padding: 1.25rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin: 1.5em 0;
    border-left: 4px solid var(--theme-primary);
}

.preview-content pre code {
    background-color: transparent;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-size: 0.875rem;
}

/* Blockquotes */
.preview-content blockquote {
    border-left: 4px solid var(--theme-primary);
    padding: 1rem 1.5rem;
    margin: 1.5em 0;
    background-color: var(--theme-surface);
    color: var(--theme-text-light);
    font-style: italic;
}

.preview-content blockquote p {
    margin: 0;
}

/* Tables */
.preview-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5em 0;
    overflow: hidden;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.preview-content th {
    background-color: var(--theme-primary);
    color: white;
    font-weight: 600;
    padding: 0.75rem 1rem;
    text-align: left;
}

.preview-content td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--theme-border);
}

.preview-content tr:nth-child(even) {
    background-color: var(--theme-surface);
}

.preview-content tr:hover {
    background-color: #f1f5f9;
}

/* Horizontal Rules */
.preview-content hr {
    border: none;
    border-top: 2px solid var(--theme-border);
    margin: 2em 0;
}

/* Images */
.preview-content img {
    max-width: 100%;
    height: auto;
    border-radius: 0.5rem;
    margin: 1em 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Strong and Emphasis */
.preview-content strong {
    font-weight: 700;
    color: var(--theme-text);
}

.preview-content em {
    font-style: italic;
    color: var(--theme-text-light);
}

/* Strikethrough */
.preview-content del {
    text-decoration: line-through;
    color: var(--theme-text-light);
    opacity: 0.7;
}

/* Mermaid Diagrams */
.preview-content .mermaid {
    margin: 2em 0;
    text-align: center;
    background-color: var(--theme-surface);
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--theme-border);
}