/*
 * Blog Article Theme
 * Clean, minimal theme for long-form essay content
 * Supports both dark and light modes
 * Optimized for readability and narrative flow
 */

:root {
    /* Dark mode (default) */
    --bg-primary: #181818;
    --bg-secondary: #222222;
    --bg-tertiary: #262626;
    --text-primary: #d4d4d4;
    --text-secondary: #b8b8b8;
    --text-muted: #888888;
    --text-link: #c9c9c9;
    --border-color: #2d2d2d;
    --accent-color: #4a9eff;
    --quote-bg: rgba(74, 159, 255, 0.08);
}

[data-theme="light"] {
    /* Light mode */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f8f8;
    --bg-tertiary: #f0f0f0;
    --text-primary: #0a0a0a;
    --text-secondary: #4a4a4a;
    --text-muted: #666666;
    --text-link: #2a2a2a;
    --border-color: #d0d0d0;
    --accent-color: #0066cc;
    --quote-bg: rgba(0, 102, 204, 0.08);
}

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

body {
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    font-size: 18px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 60px 20px;
}

/* Back Link Styling */
.back-link {
    display: inline-block;
    font-size: 15px;
    color: var(--text-link);
    text-decoration: none;
    opacity: 0.7;
    padding-top: 16px;
    margin-bottom: 60px;
    transition: opacity 0.2s ease, color 0.2s ease;
}

.back-link:hover {
    opacity: 1;
    color: var(--text-primary);
    text-decoration: none;
}

/* Typography */
h1 {
    font-size: 42px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 22px;
    color: var(--text-muted);
    margin-bottom: 50px;
    font-weight: 400;
    padding-bottom: 50px;
    border-bottom: 1px solid var(--border-color);
}

h2 {
    font-size: 28px;
    font-weight: 600;
    margin-top: 50px;
    margin-bottom: 24px;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

h3 {
    font-size: 22px;
    font-weight: 600;
    margin-top: 40px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

p {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.highlight {
    color: var(--text-primary);
    font-weight: 500;
}

/* Diagrams and Visual Elements */
.diagram-container {
    margin: 50px 0;
    padding: 30px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: visible;
}

.diagram-title {
    font-size: 14px;
    color: var(--text-muted);
    text-align: center;
    margin-top: 20px;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

svg {
    display: block;
    margin: 0 auto;
    width: 100%;
    height: auto;
}

/* Key Insights */
.key-insight {
    margin: 40px 0;
    padding: 30px;
    background: var(--bg-tertiary);
    border-left: 3px solid var(--text-primary);
}

.key-insight p {
    margin: 0;
    font-size: 20px;
    line-height: 1.6;
}

/* Author Section */
.author {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 16px;
}

.author p {
    color: var(--text-muted);
}

/* Lists */
ul {
    margin: 20px 0 20px 30px;
    color: var(--text-secondary);
}

li {
    margin-bottom: 10px;
}

/* Links */
a {
    color: var(--text-link);
    text-decoration: underline;
    text-decoration-color: var(--border-color);
    transition: all 0.2s ease;
}

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

/* Code */
code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 16px;
    color: var(--text-link);
}

pre {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 30px 0;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] pre {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

pre code {
    background: none;
    padding: 0;
}

/* Blockquotes */
blockquote {
    margin: 40px 0;
    padding-left: 30px;
    border-left: 3px solid var(--border-color);
    font-style: italic;
    color: var(--text-muted);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        font-size: 16px;
    }

    .container {
        padding: 40px 16px;
    }

    .back-link {
        font-size: 14px;
        margin-bottom: 40px;
        padding-top: 8px;
    }

    h1 {
        font-size: 32px;
    }

    .subtitle {
        font-size: 18px;
        margin-bottom: 30px;
        padding-bottom: 30px;
    }

    h2 {
        font-size: 24px;
        margin-top: 40px;
    }

    h3 {
        font-size: 20px;
        margin-top: 30px;
    }

    .diagram-container {
        padding: 20px;
        margin: 30px 0;
    }

    .key-insight {
        padding: 20px;
        margin: 30px 0;
    }

    .key-insight p {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 15px;
    }

    .back-link {
        font-size: 13px;
        margin-bottom: 30px;
    }

    h1 {
        font-size: 28px;
    }

    .subtitle {
        font-size: 16px;
        padding-bottom: 20px;
    }

    h2 {
        font-size: 22px;
    }

    .diagram-container {
        padding: 16px;
    }

    .key-insight {
        padding: 16px;
    }
}