:root{--bg: #0a0a0c;--bg-gradient: radial-gradient(ellipse at 50% 0%, #14141a 0%, #0a0a0c 70%);--surface: #111115;--surface-hover: #18181d;--border: rgba(255, 255, 255, .08);--border-hover: rgba(255, 255, 255, .14);--text: rgba(255, 255, 255, .92);--text-secondary: rgba(255, 255, 255, .6);--text-muted: rgba(255, 255, 255, .4);--accent: #4f8cff;--accent-hover: #6b9fff;--shadow: 0 16px 40px rgba(0, 0, 0, .4);--shadow-sm: 0 4px 12px rgba(0, 0, 0, .3);--r-lg: 20px;--r-md: 14px;--r-sm: 10px;--r-pill: 999px;--transition: .18s ease;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background:var(--bg);background-image:var(--bg-gradient);color:var(--text);min-height:100vh;line-height:1.5}.app{width:100%;padding:48px 24px;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center}.header{text-align:center;margin-bottom:48px;width:100%;max-width:1000px}.header h1{font-size:2.25rem;font-weight:600;letter-spacing:-.02em;margin-bottom:8px}.subtitle{color:var(--text-secondary);font-size:1rem}.main{display:grid;grid-template-columns:320px 1fr;gap:20px;align-items:stretch;width:100%;max-width:1000px}@media (max-width: 900px){.main{grid-template-columns:1fr;max-width:600px}}.editor-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;order:2}@media (max-width: 900px){.editor-section{order:1}}.editor-header{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;border-bottom:1px solid 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