:root{color-scheme:light dark;--font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--accent: #0a6cff;--grid-line: rgba(128, 128, 128, .35);--bg: #ffffff;--fg: #161616;--muted: #767676;--surface: #f4f4f5;--border: #d9d9de;--danger: #b3261e;--income: #1a5c1a;--expense: #7a1010}@media(prefers-color-scheme:dark){:root{--bg: #1c1c1e;--fg: #ececec;--muted: #9a9a9e;--surface: #2a2a2d;--border: #3a3a3e}}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:var(--font-stack);background:var(--bg);color:var(--fg)}.muted{color:var(--muted)}.center-screen{display:grid;place-items:center;height:100vh}.topbar{display:flex;align-items:center;gap:10px;padding:8px 14px;border-bottom:1px solid var(--border);background:var(--surface)}.topbar .brand{font-weight:700;letter-spacing:.02em;margin-right:4px;text-decoration:none;color:var(--fg)}.topbar .spacer{flex:1}.btn{font:inherit;padding:4px 12px;border:1px solid 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