/* CSS Variables - Light mode defaults */
:root {
    --bg: #fff;
    --text: #222;
    --text-muted: #666;
    --text-faint: #999;
    --border: #ddd;
    --border-strong: #ccc;
    --link: #0066cc;

    /* Surfaces */
    --surface: #f5f5f5;
    --surface-alt: #f9f9f9;
    --surface-raised: #f0f0f0;

    /* Semantic colors */
    --accent: #0066cc;
    --accent-bg: #e6f7ff;
    --accent-bg-alt: #f0f8ff;
    --accent-bg-light: #e8f4f8;

    --warning: #cc0000;
    --warning-bg: #ffe6e6;

    --success: #4caf50;
    --success-bg: #e8f5e9;

    --highlight: #ffcc00;
    --highlight-bg: #fff9e6;

    --orange: #cc6600;
    --orange-bg: #fff9f0;
    --orange-alt: #ffa500;
    --orange-bg-alt: #fffacd;

    /* Table */
    --th-bg: #f0f0f0;

    /* Boxes */
    --box-neutral: #666;
    --box-neutral-bg: #f5f5f5;
}

/* Dark mode overrides */
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1a1a1a;
        --text: #e0e0e0;
        --text-muted: #aaa;
        --text-faint: #888;
        --border: #444;
        --border-strong: #444;
        --link: #6bb3ff;

        --surface: #2a2a2a;
        --surface-alt: #252525;
        --surface-raised: #333;

        --accent: #6bb3ff;
        --accent-bg: #1a2a3a;
        --accent-bg-alt: #1a2a3a;
        --accent-bg-light: #1a2a3a;

        --warning: #ff6666;
        --warning-bg: #3a1a1a;

        --success: #66cc66;
        --success-bg: #1a3a1a;

        --highlight: #d4a800;
        --highlight-bg: #3a3520;

        --orange: #e68a00;
        --orange-bg: #3a2a1a;
        --orange-alt: #e68a00;
        --orange-bg-alt: #3a3520;

        --th-bg: #333;

        --box-neutral: #888;
        --box-neutral-bg: #2a2a2a;
    }
}

/* Common styles for all articles */
body {
    margin: 0;
    padding: 0;
    font-family: Georgia, serif;
    font-size: 18px;
    line-height: 1.8;
    color: var(--text);
    background: var(--bg);
}

/* Simple centered layout (for pages without .page-container) */
body:not(:has(.page-container)) {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

/* Layout container for sidebar + content */
.page-container {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    justify-content: center;
}

/* Sidebar navigation */
.sidebar {
    width: 250px;
    position: sticky;
    top: 20px;
    height: fit-content;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    padding: 20px;
    margin-right: 40px;
    border-right: 1px solid var(--border);
}

.sidebar-nav {
    font-size: 14px;
    line-height: 1.6;
}

.sidebar-nav a {
    display: block;
    padding: 6px 0;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.sidebar-nav a:hover {
    color: var(--link);
}

.sidebar-nav a.active {
    color: var(--link);
    font-weight: bold;
    border-left: 3px solid var(--link);
    padding-left: 10px;
    margin-left: -10px;
}

.sidebar-nav .section-h2 {
    font-weight: bold;
    margin-top: 15px;
    font-size: 15px;
}

.sidebar-nav .section-h3 {
    padding-left: 15px;
    font-size: 13px;
}

/* Main content area */
.main-content {
    max-width: 900px;
    margin: 40px 0;
    padding: 0 40px;
    flex: 1;
}

/* Simple layout for pages without sidebar */
.simple-layout {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

/* Mobile responsiveness */
@media (max-width: 1200px) {
    .sidebar {
        display: none;
    }
    .main-content {
        margin: 20px auto;
        padding: 0 20px;
    }
    .page-container {
        display: block;
    }
}

@media (max-width: 768px) {
    body {
        font-size: 16px;
        line-height: 1.6;
    }
    body:not(:has(.page-container)) {
        margin: 20px auto;
        padding: 0 15px;
    }
    .main-content {
        margin: 10px auto;
        padding: 0 15px;
    }
    .simple-layout {
        margin: 20px auto;
        padding: 0 15px;
    }
}

/* Typography */
h1 {
    font-size: 32px;
    margin-bottom: 10px;
    line-height: 1.3;
}

/* Smaller h1 for simple layouts */
body:not(:has(.page-container)) h1 {
    font-size: 28px;
}

h2 {
    font-size: 26px;
    margin-top: 50px;
    margin-bottom: 20px;
    border-top: 2px solid var(--border-strong);
    padding-top: 30px;
}

/* Simpler h2 for simple layouts */
body:not(:has(.page-container)) h2 {
    font-size: 22px;
    margin-top: 40px;
    margin-bottom: 15px;
    border-top: none;
    padding-top: 0;
}

h3 {
    font-size: 22px;
    margin-top: 35px;
    margin-bottom: 15px;
}

body:not(:has(.page-container)) h3 {
    font-size: 20px;
    margin-top: 30px;
    margin-bottom: 10px;
}

h4 {
    font-size: 20px;
    margin-top: 25px;
    margin-bottom: 10px;
    font-weight: bold;
}

@media (max-width: 768px) {
    h1 { font-size: 26px; }
    h2 { font-size: 22px; margin-top: 35px; padding-top: 20px; }
    h3 { font-size: 19px; margin-top: 25px; }
    h4 { font-size: 18px; margin-top: 20px; }
}

/* Links */
a {
    color: var(--link);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Horizontal rule */
hr {
    border: none;
    border-top: 1px solid var(--border-strong);
    margin: 40px 0;
}

body:not(:has(.page-container)) hr {
    margin: 30px 0;
}

/* Text elements */
.subtitle {
    font-style: italic;
    color: var(--text-muted);
    margin-bottom: 10px;
    font-size: 20px;
}

.meta {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 40px;
}

/* Lists */
ul {
    margin-left: 20px;
}

ol {
    margin-left: 20px;
}

li {
    margin-bottom: 10px;
}

/* Navigation */
.back-link {
    margin-bottom: 30px;
}

/* Blockquotes */
blockquote {
    margin: 30px 0;
    padding: 15px 20px;
    background-color: var(--surface-alt);
    border-left: 4px solid var(--accent);
    font-style: italic;
}

@media (max-width: 768px) {
    blockquote {
        margin: 20px 0;
        padding: 10px 15px;
    }
}

/* Inline code and emphasis */
em {
    font-style: italic;
}

strong {
    font-weight: bold;
}

code {
    background-color: var(--surface);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: monospace;
    font-size: 16px;
}

pre {
    background-color: var(--surface);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    font-family: monospace;
    font-size: 14px;
    line-height: 1.4;
}

@media (max-width: 768px) {
    pre {
        padding: 10px;
        font-size: 13px;
    }
}

/* Tables */
table {
    border-collapse: collapse;
    width: 100%;
    margin: 25px 0;
    font-size: 16px;
}

th, td {
    border: 1px solid var(--border);
    padding: 12px;
    text-align: left;
    color: var(--text);
}

th {
    background-color: var(--th-bg);
    font-weight: bold;
}

@media (max-width: 768px) {
    table {
        font-size: 14px;
    }
    th, td {
        padding: 8px;
    }
}

/* Content boxes */
.key-box {
    background-color: var(--highlight-bg);
    border-left: 4px solid var(--highlight);
    padding: 20px;
    margin: 30px 0;
}

.evidence-box {
    background-color: var(--accent-bg);
    border-left: 4px solid var(--accent);
    padding: 20px;
    margin: 30px 0;
}

.warning-box {
    background-color: var(--warning-bg);
    border-left: 4px solid var(--warning);
    padding: 20px;
    margin: 30px 0;
}

.convergence-box {
    background-color: var(--success-bg);
    border-left: 4px solid var(--success);
    padding: 20px;
    margin: 30px 0;
}

.scenario-box {
    background-color: var(--surface);
    padding: 15px 20px;
    margin: 20px 0;
    border-left: 4px solid var(--box-neutral);
}

.diagnostic-box {
    background-color: var(--orange-bg);
    padding: 15px 20px;
    margin: 20px 0;
    border-left: 4px solid var(--orange);
}

@media (max-width: 768px) {
    .key-box, .evidence-box, .warning-box, .convergence-box,
    .scenario-box, .diagnostic-box {
        padding: 12px 15px;
        margin: 20px 0;
    }
}

/* Figures and images */
sup {
    font-size: 0.8em;
    vertical-align: super;
}

.figure {
    margin: 35px 0;
    text-align: center;
}

.figure img {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--border);
    border-radius: 5px;
}

.figure-caption {
    margin-top: 10px;
    font-size: 15px;
    color: var(--text-muted);
    font-style: italic;
}

@media (max-width: 768px) {
    .figure {
        margin: 25px 0;
    }
    .figure-caption {
        font-size: 14px;
    }
}

/* Additional CSS classes from various articles */

.article-title {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 5px;
}

.article-desc {
    color: var(--text-muted);
    margin-bottom: 5px;
}

.article-meta {
    font-size: 14px;
    color: var(--text-faint);
}

.calculation-box {
    background-color: var(--surface);
    padding: 15px 20px;
    border-left: 4px solid var(--box-neutral);
    margin: 20px 0;
}

.collapsible-section {
    margin: 20px 0;
    border: 1px solid var(--border);
    border-radius: 4px;
}

.collapsible-header {
    background-color: var(--surface);
    padding: 12px 15px;
    cursor: pointer;
    font-weight: bold;
    font-size: 16px;
    user-select: none;
}

.collapsible-content {
    display: none;
    padding: 15px;
    background-color: var(--surface-alt);
}

.diagram {
    background-color: var(--surface);
    padding: 20px;
    margin: 30px 0;
    border-radius: 5px;
    font-family: monospace;
    font-size: 14px;
    line-height: 1.4;
    overflow-x: auto;
    white-space: pre;
}

.epistemic-status {
    background-color: var(--surface);
    border-left: 4px solid var(--text-faint);
    padding: 15px 20px;
    margin: 30px 0;
    font-size: 16px;
}

.example-box {
    background-color: var(--surface-alt);
    padding: 15px 20px;
    margin: 20px 0;
    border-left: 4px solid var(--box-neutral);
}

.express-track {
    background-color: var(--orange-bg-alt);
    border-left: 4px solid var(--orange-alt);
    padding: 15px 20px;
    margin: 20px 0;
    font-size: 16px;
}

.formula {
    background-color: var(--accent-bg);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: "Courier New", monospace;
}

.hero-quote {
    background-color: var(--accent-bg-light);
    border-left: 5px solid var(--accent);
    padding: 20px 25px;
    margin: 30px 0;
    font-size: 20px;
    font-weight: bold;
    text-align: center;
}

.key-claim {
    background-color: var(--accent-bg-alt);
    border-left: 4px solid var(--accent);
    padding: 20px;
    margin: 30px 0;
    font-size: 19px;
}

.key-insight {
    background-color: var(--accent-bg);
    border-left: 4px solid var(--accent);
    padding: 15px 20px;
    margin: 30px 0;
}

.key-insight h2,
.key-insight h3,
.key-box h3,
.evidence-box h3,
.scenario-box h3,
.diagnostic-box h3 {
    margin-top: 0 !important;
    border: none;
    padding-top: 0;
}

.meta-box {
    background-color: var(--accent-bg-alt);
    padding: 20px;
    margin: 30px 0;
    border-left: 4px solid var(--accent);
}

.mode-box {
    background-color: var(--surface);
    padding: 15px 20px;
    margin: 20px 0;
    border-left: 4px solid var(--box-neutral);
}

.physics-box {
    background-color: var(--orange-bg);
    padding: 15px 20px;
    margin: 20px 0;
    border-left: 4px solid var(--orange);
}

.reading-guide {
    background-color: var(--accent-bg-alt);
    border: 1px solid var(--accent);
    padding: 20px;
    margin: 30px 0;
    border-radius: 5px;
}

.reading-guide h3 {
    margin-top: 0;
    color: var(--accent);
}

.read-more {
    background-color: var(--surface-alt);
    border: 1px solid var(--border);
    padding: 20px;
    margin: 35px 0;
    font-size: 16px;
}

.read-more h3 {
    margin-top: 0;
    font-size: 20px;
}

.toc {
    background-color: var(--surface-alt);
    padding: 20px;
    margin: 30px 0;
    border: 1px solid var(--border);
}

.toc h3 {
    margin-top: 0;
}

.toc ul {
    margin-bottom: 0;
}

.toc a {
    color: var(--link);
}

.who-why-what {
    background-color: var(--accent-bg-alt);
    border-left: 4px solid var(--accent);
    padding: 15px 20px;
    margin: 20px 0;
    font-size: 17px;
}

@media (max-width: 768px) {
    .epistemic-status, .key-insight, .express-track, .hero-quote,
    .key-claim, .meta-box, .physics-box, .who-why-what,
    .example-box, .mode-box {
        padding: 12px 15px;
        margin: 20px 0;
        font-size: 16px;
    }
}