:root{--primary:#1f4e79;--primary-ink:#fff;--primary-soft:#e8eef5;--ink:#1a1f24;--ink-2:#3d4650;--line:#c9d1d9;--line-strong:#8a96a3;--bg:#f5f6f8;--surface:#fff;--warn-bg:#fff4d1;--warn-line:#b27300;--warn-ink:#5c3b00;--err-bg:#fdecea;--err-line:#b3261e;--err-ink:#8a1c14;--ok-bg:#e7f4ec;--ok-ink:#1d5b34;--font:"Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", "Meiryo", "IPAGothic", sans-serif;--radius:10px;--shadow-sm:0 1px 2px #1018280f, 0 1px 3px #10182814;--shadow-md:0 4px 12px #10182814, 0 1px 3px #1018280f}*{box-sizing:border-box}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--ink);font-family:var(--font);margin:0;padding-bottom:48px;font-size:16px;line-height:1.7}.num,input.num,td.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}td.num,.num{text-align:right}.mono{font-variant-numeric:tabular-nums;letter-spacing:.02em}h1,h2,h3{line-height:1.4}h2{margin:8px 0 4px;font-size:1.5rem}h3{margin:28px 0 8px;font-size:1.125rem}a{color:var(--primary)}.wrap{max-width:1280px;margin:0 auto;padding:0 16px}.muted{color:var(--ink-2)}.lead{color:var(--ink-2);margin:0 0 8px}.small-gap{margin-top:16px}.error-text{color:var(--err-ink);font-weight:600}.demo-ribbon{color:#fff;text-align:center;background:#2b2f33;padding:6px 16px;font-size:16px}.app-header{background:var(--surface);border-bottom:1px solid var(--line);box-shadow:var(--shadow-sm)}.header-inner{flex-wrap:wrap;align-items:center;gap:8px 14px;padding-top:14px;padding-bottom:8px;display:flex}.brand-mark{background:var(--primary);color:#fff;border-radius:10px;flex:none;place-items:center;width:40px;height:40px;display:inline-grid}.brand-text{flex-direction:column;min-width:0;display:flex}.app-title{color:var(--ink);letter-spacing:.01em;margin:0;font-size:1.375rem}.app-sub{color:var(--ink-2);margin:0;line-height:1.4}.mode-bar{background:var(--warn-bg);color:var(--warn-ink);border-top:1px solid 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