:root{--bg-sidebar: #000000;--bg-main: #09090b;--bg-card: #09090b;--bg-code: #000000;--border-color: #18181b;--border-focus: #3f3f46;--text-primary: #f4f4f5;--text-secondary: #a1a1aa;--text-muted: #52525b;--error: #ef4444;--success: #10b981;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", monospace;--sidebar-width: 260px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-main);color:var(--text-primary);font-family:var(--font-sans);font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased;height:100vh;overflow:hidden}.app-container{display:flex;height:100vh;width:100vw}.sidebar{width:var(--sidebar-width);background:var(--bg-sidebar);border-right:1px solid var(--border-color);display:flex;flex-direction:column;flex-shrink:0}.sidebar-header{padding:1.5rem;border-bottom:1px solid var(--border-color)}.sidebar-logo{font-family:var(--font-mono);font-weight:700;font-size:1.1rem;letter-spacing:-.05em;text-decoration:none;color:var(--text-primary);display:flex;align-items:center;gap:.5rem}.sidebar-logo span{color:var(--error)}.sidebar-nav{flex:1;padding:1.5rem 1rem;overflow-y:auto;display:flex;flex-direction:column;gap:.5rem}.nav-group-title{font-size:.75rem;font-weight:700;text-transform:uppercase;color:var(--text-muted);letter-spacing:.05em;margin-top:1rem;margin-bottom:.5rem;padding-left:.5rem}.nav-link{display:block;padding:.5rem .75rem;border-radius:4px;color:var(--text-secondary);text-decoration:none;font-weight:500;font-size:.88rem;transition:all .2s ease;cursor:pointer}.nav-link:hover{background:#18181b;color:var(--text-primary)}.nav-link.active{background:#27272a;color:var(--text-primary);font-weight:600}.main-content{flex:1;display:flex;flex-direction:column;height:100vh;overflow:hidden;background:var(--bg-main)}.content-header{padding:1rem 2rem;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center}.page-title{font-size:1.1rem;font-weight:700;letter-spacing:-.02em}.hero-quote{font-style:italic;color:var(--text-muted);font-size:.85rem;max-width:500px;text-align:right}.content-body{flex:1;padding:2rem;overflow-y:auto}.tab-screen{display:none;height:100%}.tab-screen.active{display:flex;flex-direction:column}.playground-workspace{display:grid;grid-template-columns:1.2fr .8fr;gap:1.5rem;height:100%;min-height:0}@media (max-width: 1024px){.playground-workspace{grid-template-columns:1fr;overflow-y:auto}}.panel-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:6px;display:flex;flex-direction:column;overflow:hidden}.panel-header{padding:.75rem 1rem;border-bottom:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center;background:#0003}.panel-title{font-weight:600;font-size:.85rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary)}.panel-body{flex:1;position:relative;min-height:0;overflow:hidden}textarea.plain-editor{width:100%;height:100%;background:var(--bg-code);color:#e4e4e7;border:none;font-family:var(--font-mono);font-size:.85rem;padding:1.25rem;resize:none;outline:none;line-height:1.5;tab-size:2}select.plain-select{background:var(--bg-code);color:var(--text-primary);border:1px solid var(--border-color);border-radius:4px;padding:.35rem .75rem;font-family:var(--font-sans);font-size:.8rem;outline:none;cursor:pointer}.diagnostics-container{display:flex;flex-direction:column;height:100%;overflow-y:auto}.diagnostic-item{border-bottom:1px solid var(--border-color);padding:1rem}.diagnostic-item:last-child{border-bottom:none}.diagnostic-meta{display:flex;justify-content:space-between;font-size:.8rem;margin-bottom:.25rem}.diagnostic-rule{color:var(--error);font-weight:700;font-family:var(--font-mono)}.diagnostic-line{color:var(--text-muted)}.diagnostic-desc{color:var(--text-secondary);font-size:.85rem;margin-bottom:.5rem}.diagnostic-snippet{background:var(--bg-code);border:1px solid var(--border-color);padding:.5rem;font-family:var(--font-mono);font-size:.8rem;color:#a1a1aa;overflow-x:auto;white-space:pre}.empty-diagnostics{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-muted);font-size:.85rem}.score-badge{background:var(--border-color);color:var(--text-primary);padding:.25rem .5rem;font-family:var(--font-mono);font-size:.8rem;border-radius:4px}.score-badge.fail{color:var(--error);border-color:var(--error)}.doc-page{max-width:800px;margin:0 auto}.doc-section{margin-bottom:3rem}.doc-section h1{font-size:2rem;font-weight:800;letter-spacing:-.03em;margin-bottom:1rem;border-bottom:1px solid var(--border-color);padding-bottom:1rem}.doc-section h2{font-size:1.35rem;font-weight:700;letter-spacing:-.02em;margin-top:2rem;margin-bottom:.75rem}.doc-section p{color:var(--text-secondary);line-height:1.6;margin-bottom:1rem}.doc-section ul{margin-bottom:1.5rem;padding-left:1.5rem}.doc-section li{color:var(--text-secondary);margin-bottom:.5rem}.doc-code-block{background:var(--bg-code);border:1px solid var(--border-color);border-radius:6px;padding:1.25rem;font-family:var(--font-mono);font-size:.85rem;line-height:1.5;color:#cbd5e1;overflow-x:auto;margin-bottom:1.5rem}.diff-container{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1.5rem}@media (max-width: 768px){.diff-container{grid-template-columns:1fr}}.diff-box{border:1px solid var(--border-color);border-radius:6px;overflow:hidden;background:var(--bg-code)}.diff-box-header{padding:.5rem .75rem;font-size:.75rem;font-weight:700;text-transform:uppercase;border-bottom:1px solid var(--border-color)}.diff-box.bad .diff-box-header{color:var(--error);background:#ef44440d}.diff-box.good .diff-box-header{color:var(--success);background:#10b9810d}.diff-code{padding:1rem;font-family:var(--font-mono);font-size:.8rem;line-height:1.5;overflow-x:auto;margin:0}