:root{--ink:#1d2429;--muted:#6d7a80;--soft:#f3f6f7;--panel:#fff;--line:#d9e1e4;--concrete:#c8d0d3;--blue:#2f8fa3;--amber:#c8922e;--red:#cf5f53;--shadow:0 14px 34px #1d242914;--radius:8px;--body:"BIZ UDPGothic", "Yu Gothic UI", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;--display:"IBM Plex Sans JP", "Yu Gothic", "Hiragino Sans", sans-serif;--mono:"IBM Plex Mono", "SFMono-Regular", Consolas, monospace}*{box-sizing:border-box}html{min-width:320px;color:var(--ink);background:var(--soft);font-family:var(--body);letter-spacing:0}body{background:linear-gradient(90deg, #1d242909 1px, transparent 1px), linear-gradient(180deg, #1d242908 1px, transparent 1px), var(--soft);background-size:44px 44px;min-height:100vh;margin:0}button,input{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible{outline-offset:2px;outline:3px solid #2f8fa347}.app{grid-template-columns:220px 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