body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
    line-height: 1.6;
    color: #d4d4d4;
    background: #1e1e1e;
}

h1, h2, h3 {
    color: #4fc1ff;
    font-weight: 600;
}

h1 {
    text-align: center;
}

h2 {
    text-align: center;
}

.intro {
    background: #252526;
    padding: 20px;
    margin: 30px 0;
    border-left: 4px solid #3498db;
}

.demo-section {
    background: #252526;
    border: 1px solid #3e3e42;
    padding: 20px;
    margin: 30px 0;
}

.mermaid {
    text-align: center;
    margin: 20px 0;
}

code {
    background: #2d2d30;
    padding: 2px 6px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
    color: #ce9178;
}

pre {
    background: #1e1e1e;
    border: 1px solid #3e3e42;
    padding: 16px;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
    line-height: 1.45;
    color: #d4d4d4;
}

blockquote {
    margin: 20px 0;
    padding: 0 20px;
    color: #a8a8a8;
    border-left: 4px solid #3e3e42;
}

.highlight {
    background: #3a3a1f;
    padding: 15px;
    margin: 20px 0;
    border-left: 4px solid #ffc107;
    color: #d4d4d4;
}

.anchor-target {
    padding-top: 60px;
    margin-top: -60px;
}

a {
    color: #4fc1ff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
    color: #6dd7ff;
}

ul, ol {
    padding-left: 20px;
}

.navigation-demo {
    margin: 40px 0;
    text-align: center;
}

.toc {
    float: right;
    background: #252526;
    border: 1px solid #3e3e42;
    border-left: 4px solid #007acc;
    padding: 15px 20px;
    margin: 0 0 20px 30px;
    max-width: 320px;
    font-size: 0.9em;
}

.toc h3 {
    margin-top: 0;
    margin-bottom: 10px;
    color: #4fc1ff;
    font-size: 1.1em;
}

.toc ol {
    line-height: 1.6;
    padding-left: 20px;
    margin: 0;
}

.toc ul {
    list-style-type: none;
    padding-left: 20px;
    margin: 6px 0;
}

.toc li {
    margin: 4px 0;
}

.toc a {
    color: #d4d4d4;
    text-decoration: none;
}

.toc a:hover {
    color: #4fc1ff;
    text-decoration: underline;
}

@media (max-width: 800px) {
    .toc {
        float: none;
        max-width: 100%;
        margin: 20px 0;
    }
}

/* Parser Visualization Styles */
.demo-section.parser-demo {
    width: 100vw;
    margin-left: calc(-50vw + 50%);
    max-width: calc(100vw - 10px);
    padding: 10px 10px;
    background: #252526;
    border-top: 1px solid #3e3e42;
    border-bottom: 1px solid #3e3e42;
}

#parser-demo-panels {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 5px;
    margin-top: 20px;
}

.panel {
    background: #1e1e1e;
    border: 1px solid #3e3e42;
    padding: 12px;
    max-height: 400px;
    overflow-y: auto;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

#parser-input {
    width: 100%;
    background: #1e1e1e;
    color: #d4d4d4;
    border: 1px solid #3e3e42;
    padding: 8px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 13px;
    box-sizing: border-box;
    resize: vertical;
    min-height: 150px;
    outline: none;
}

#parser-input:focus {
    border-color: #007acc;
    box-shadow: 0 0 0 3px rgba(0, 122, 204, 0.2);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #3e3e42;
    padding-bottom: 8px;
    margin-bottom: 12px;
}

.panel-header h3 {
    color: #4fc1ff;
    font-size: 14px;
    font-weight: 600;
}

.panel-header-buttons {
    display: flex;
    gap: 6px;
}

.panel-header button {
    margin: 0;
    padding: 5px 5px;
    font-size: 12px;
    background: #515156;
    border: 1px solid #3e3e42;
    border-radius: 8px;
    color: #d4d4d4;
    cursor: pointer;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.panel-header button:hover {
    background: #3e3e42;
    border-color: #007acc;
}

.event {
    margin: 4px 0;
    padding: 6px 10px;
    background: #2d2d30;
    border-left: 3px solid #007acc;
    border-radius: 2px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 12px;
    color: #d4d4d4;
}

.hidden {
    display: none !important;
}

@keyframes blink {
    0%, 49% { opacity: 1; }
    50%, 100% { opacity: 0; }
}

@media (max-width: 1100px) {
    #parser-demo-panels {
        grid-template-columns: 1fr;
    }
}