:root{--bg-color: #0f172a;--text-color: #e2e8f0;--primary-color: #3b82f6;--pane-bg: #1e293b;--border-color: #334155;--header-height: 60px}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-color);color:var(--text-color);overflow:hidden}.container{display:flex;flex-direction:column;height:100vh}.header{height:var(--header-height);padding:0 1rem;display:flex;align-items:center;border-bottom:1px solid var(--border-color);background-color:var(--pane-bg)}.header h1{font-size:1.25rem;font-weight:600;margin:0;background:linear-gradient(to right,#60a5fa,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.editor-container{display:flex;flex:1;overflow:hidden}.pane{flex:1;display:flex;flex-direction:column;overflow:hidden}.editor-pane{border-right:1px solid var(--border-color)}textarea{flex:1;background-color:var(--bg-color);color:var(--text-color);border:none;resize:none;padding:1.5rem;font-family:Fira Code,monospace;font-size:1rem;line-height:1.6;outline:none}.preview-pane{background-color:var(--pane-bg);padding:1.5rem;overflow-y:auto}.markdown-body{line-height:1.7}.markdown-body h1,.markdown-body h2,.markdown-body h3{border-bottom:1px solid var(--border-color);padding-bottom:.5rem;margin-top:1.5rem}.markdown-body h1{margin-top:0}.markdown-body pre{background-color:#0f172a;padding:1rem;border-radius:.5rem;overflow-x:auto;border:1px solid var(--border-color)}.markdown-body code{font-family:Fira Code,monospace;background-color:#334155;padding:.2rem .4rem;border-radius:.25rem;font-size:.9em}.markdown-body pre code{background-color:transparent;padding:0}.markdown-body blockquote{border-left:4px solid var(--primary-color);margin:1rem 0;padding-left:1rem;color:#94a3b8}.markdown-body ul,.markdown-body ol{padding-left:1.5rem}.markdown-body img{max-width:100%;border-radius:.5rem}.markdown-body a{color:var(--primary-color);text-decoration:none}.markdown-body a:hover{text-decoration:underline}@media (max-width: 768px){.editor-container{flex-direction:column}.editor-pane{border-right:none;border-bottom:1px solid var(--border-color)}}