/* AI NOBORU — https://www.aiofonesown.com/ | 出典を示す配布用表示。参照史料・第三者の権利表示は各記載を参照。 */
:root{--navy:#183744;--ink:#203b47;--muted:#667780;--line:#d9e2e6;--paper:#fff;--wash:#f3f6f7;--accent:#c24e38;--teal:#447d86;--serif:'Noto Serif JP','Yu Mincho','Hiragino Mincho ProN',serif;--sans:'Noto Sans JP','Hiragino Kaku Gothic ProN','Yu Gothic',Meiryo,sans-serif;color-scheme:light;font-family:var(--sans);font-size:16px;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,input,textarea,select{touch-action:manipulation}button{cursor:pointer}a{color:inherit}button{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #ad5830;outline-offset:3px}button:disabled{opacity:.4;cursor:default}.topbar{height:90px;display:flex;align-items:center;justify-content:space-between;padding:0 40px;border-bottom:1px solid var(--line);background:#fff}.brand{display:flex;align-items:center;gap:14px;text-decoration:none}.seal{font-family:var(--serif);font-size:26px;background:var(--accent);color:white;width:43px;height:43px;display:grid;place-items:center;border-radius:2px}.brand-name{font-family:var(--serif);font-size:25px;font-weight:700;letter-spacing:.08em;white-space:nowrap}.brand-name span{display:block;font-family:var(--sans);font-size:12px;letter-spacing:.26em;font-weight:500;margin-top:2px}.brand-divider{height:32px;width:1px;background:var(--line);margin:0 7px}.brand-room{font-size:17px;letter-spacing:.15em}.header-actions{display:flex;gap:30px;align-items:center}.edition{font-size:12px;letter-spacing:.08em;color:var(--muted)}.quiet{border:0;background:transparent;padding:9px 0;font-size:14px}.quiet span{border:1px solid var(--muted);border-radius:50%;display:inline-grid;place-items:center;width:18px;height:18px;margin-left:8px;font-size:12px}.layout{display:grid;grid-template-columns:250px minmax(0,1fr);max-width:1720px;margin:auto;min-height:calc(100vh - 90px)}.sidebar{padding:37px 20px 25px 26px;border-right:1px solid var(--line);background:#fafbfc}.eyebrow{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;letter-spacing:.14em;margin:0 10px 22px}.eyebrow span{font-size:12px}.nav-item{display:flex;align-items:center;gap:13px;width:100%;text-align:left;text-decoration:none;padding:16px 11px;margin-bottom:6px;border-radius:4px;position:relative;transition:background .15s}.nav-item:hover{background:#eef2f3}.nav-item[aria-current=page]{background:#e7eef0;color:var(--navy)}.nav-item[aria-current=page]:before{content:'';position:absolute;left:-6px;top:17px;bottom:17px;width:3px;background:var(--accent)}.nav-num{width:25px;flex-shrink:0;color:#809298;font-family:var(--serif);font-size:17px}.nav-item[aria-current=page] 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print{.topbar,.sidebar,.header-actions,footer,.examples,.calculate,.copy{display:none}.layout,main{display:block;margin:0;padding:0}.workbench{grid-template-columns:1fr 1fr}.answer-card{background:white;color:black;border:1px solid #555}.answer-label,.answer-detail,.exact-note{color:black}.badge{color:black}.answer-value{font-size:25px}details{break-inside:avoid}.drawing{height:250px}}

/* Public entry points and provenance; no arithmetic changes. */
.purpose-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;max-width:1720px;margin:0 auto;border-bottom:1px solid var(--line);background:var(--wash);padding:10px 36px}
.purpose-nav a{display:flex;justify-content:center;align-items:center;gap:12px;padding:9px 12px;text-decoration:none;border-right:1px solid var(--line);min-width:0}
.purpose-nav a:last-child{border-right:0}.purpose-nav a:hover{background:#e7eef0}.purpose-nav strong{font-size:14px;font-weight:600}.purpose-nav span{font-size:12px;color:var(--muted)}
.tool-provenance{margin:17px 0 0;border:0;border-left:2px solid var(--line);border-radius:0;padding-left:14px;background:transparent}
.tool-provenance summary{padding:3px 0;font-size:13px;line-height:1.9;justify-content:flex-start;gap:12px}
.tool-provenance p{font-size:14px;line-height:1.9;margin:8px 0;max-width:54em}.tool-provenance .hint{font-size:12px}
.answer-precision{font-size:13px;line-height:1.9;overflow-wrap:anywhere;border-left:2px solid #9db6c0;padding-left:11px;margin:15px 0 0;color:#e0edf1}
.answer-precision strong{display:block;font-weight:600;margin-bottom:4px;color:white}
@media(max-width:660px){.purpose-nav{padding:7px 10px}.purpose-nav a{padding:8px 4px;display:block;text-align:center}.purpose-nav strong{display:block;font-size:13px}.purpose-nav span{display:block;font-size:10px;margin-top:4px;line-height:1.6}.formula-strip>.formula{white-space:normal;min-width:0}}
@media print{.purpose-nav{display:none}.answer-precision,.answer-precision strong{color:black}}

@media(max-width:700px){}