:root{color-scheme:light;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f4f6f8;color:#111827;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:#f4f6f8}button,input{font:inherit}button{cursor:pointer}.app{--bg: #f4f6f8;--surface: #ffffff;--surface-alt: #f8fafc;--surface-warm: #fff4e3;--text: #111827;--muted: #667085;--line: #d9e1ea;--line-strong: #c8d2dd;--accent: #2563eb;--accent-strong: #1683ff;--orange: #ff9500;--green: #16a34a;--violet: #7c3aed;--danger: #dc2626;--shadow: 0 20px 50px rgba(20, 35, 55, .11);min-height:100vh;background:var(--bg);color:var(--text)}.app[data-theme=dark]{color-scheme:dark;--bg: #111418;--surface: #191e24;--surface-alt: #222832;--surface-warm: #30281f;--text: #f5f7fa;--muted: #a7b0bd;--line: #303844;--line-strong: #46505d;--accent: #7aa2ff;--accent-strong: #4ea1ff;--orange: #ffad33;--green: #50c878;--violet: #a78bfa;--danger: #fb7185;--shadow: 0 20px 50px rgba(0, 0, 0, .24)}.topbar{height:80px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:0 24px;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--surface) 92%,transparent);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);position:sticky;top:0;z-index:10}.brand,.topbar-actions,.toolbar-row,.reader-actions,.transport-row,.editor-toolbar,.metadata-line,.studio-header,.mode-tabs{display:flex;align-items:center}.brand{gap:12px;min-width:0}.brand-mark{width:42px;height:42px;display:grid;place-items:center;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--violet));color:#fff;flex:0 0 auto}.brand-mark svg,button svg,.tag-row svg,.bookmark-list svg{width:18px;height:18px;stroke-width:2}.brand h1{margin:0;font-size:19px;line-height:1.1;letter-spacing:0}.brand p{margin:4px 0 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