/* GeoCAD Bridge Knowledge Center and reference pages.
   Shares the colour tokens used by the Tools hub so library pages match the app. */
:root{color-scheme:dark;--cyan:#18d7ff;--teal:#31e6c0;--gold:#ffc15a;--bg:#061622;--panel:#0a2030;--panel2:#0d2638;--text:#e9f4fa;--muted:#a9bfcc;--line:rgba(24,215,255,.2);--focus:#ffd166;--on-accent:#03121c}
:root[data-theme="light"]{color-scheme:light;--cyan:#006d8f;--teal:#007a62;--gold:#8a5a00;--bg:#f4f8fb;--panel:#ffffff;--panel2:#eaf2f7;--text:#0b2233;--muted:#47606f;--line:rgba(0,109,143,.22);--on-accent:#ffffff;--focus:#b35c00}
@media (prefers-color-scheme:light){:root:not([data-theme="dark"]){color-scheme:light;--cyan:#006d8f;--teal:#007a62;--gold:#8a5a00;--bg:#f4f8fb;--panel:#ffffff;--panel2:#eaf2f7;--text:#0b2233;--muted:#47606f;--line:rgba(0,109,143,.22);--on-accent:#ffffff;--focus:#b35c00}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;font-family:"Segoe UI",system-ui,-apple-system,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.65;font-size:17px}
a{color:var(--cyan)}a:hover{text-decoration:none}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:3px}
.skip-link{position:absolute;left:-999px;top:8px;background:var(--panel);color:var(--text);padding:8px 14px;border:1px solid var(--cyan);border-radius:6px;z-index:100}
.skip-link:focus{left:12px}
.kc-top{position:sticky;background:var(--bg);top:0;z-index:50;display:flex;align-items:center;gap:18px;padding:0 24px;min-height:60px;background:color-mix(in srgb,var(--bg) 94%,transparent);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}
.kc-brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--text);text-decoration:none;white-space:nowrap}
.kc-brand i{width:24px;height:24px;border:3px solid var(--cyan);transform:rotate(45deg);border-radius:5px;display:block}
.kc-brand b{color:var(--cyan)}
.kc-nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.kc-nav a{color:var(--text);text-decoration:none;padding:8px 12px;border-radius:6px;font-size:15px}
.kc-nav a:hover,.kc-nav a[aria-current="page"]{color:var(--cyan);background:var(--panel2)}
.kc-wrap{max-width:1180px;margin:0 auto;padding:24px 20px 64px}
.kc-crumbs{font-size:14px;color:var(--muted);margin-bottom:14px}
.kc-crumbs ol,.kc-article .kc-crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.kc-crumbs li+li:before{content:"/";margin-right:6px;color:var(--muted)}
.kc-grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:32px;align-items:start}
.kc-eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:12px;font-weight:700;color:var(--teal);margin:0 0 6px}
.kc-article h1{font-size:clamp(30px,4.2vw,44px);line-height:1.12;margin:0 0 12px;letter-spacing:-.02em}
.kc-meta{font-size:14px;color:var(--muted);margin:0 0 20px}
.kc-article h2{font-size:26px;line-height:1.25;margin:40px 0 12px;padding-top:8px;scroll-margin-top:80px}
.kc-article h3{font-size:20px;margin:26px 0 8px;scroll-margin-top:80px}
.kc-article p,.kc-article li{color:var(--text)}
.kc-article ul,.kc-article ol{padding-left:22px}
.kc-article .kc-facts,.kc-article .kc-cards{padding-left:0}
.kc-box{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px 20px;margin:18px 0}
.kc-summary{border-left:4px solid var(--cyan)}
.kc-article .kc-summary h2,.kc-article .kc-definition h2,.kc-article .kc-cite h2{font-size:15px;text-transform:uppercase;letter-spacing:.08em;margin:0 0 6px;padding:0;color:var(--cyan)}
.kc-definition{border-left:4px solid var(--teal)}
.kc-definition dfn{font-style:normal;font-weight:700}
.kc-facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px;padding:0;list-style:none}
.kc-facts li{background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:10px 12px;font-size:15px}
.kc-formula{font-family:"Cascadia Code",Consolas,monospace;background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:12px 14px;overflow-x:auto;white-space:pre;font-size:15px}
.kc-table-wrap{overflow-x:auto;margin:14px 0;border:1px solid var(--line);border-radius:8px}
.kc-article table{border-collapse:collapse;width:100%;font-size:15px;font-variant-numeric:tabular-nums}
.kc-article caption{text-align:left;padding:10px 12px;color:var(--muted);font-size:14px}
.kc-article th,.kc-article td{padding:8px 12px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}
.kc-article th:first-child,.kc-article td:first-child{text-align:left}
.kc-article thead th{background:var(--panel2);color:var(--cyan)}
.kc-figure{margin:18px 0;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px}
.kc-figure svg{display:block;width:100%;height:auto;max-height:340px}
.kc-figure figcaption{font-size:14px;color:var(--muted);margin-top:8px}
.kc-faq details{background:var(--panel);border:1px solid var(--line);border-radius:8px;margin:8px 0;padding:0 14px}
.kc-faq summary{cursor:pointer;padding:12px 0;font-weight:650}
.kc-faq details p{margin:0 0 12px}
.kc-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;padding:0;list-style:none}
.kc-cards a{display:block;height:100%;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px;text-decoration:none;color:var(--text)}
.kc-cards a:hover{border-color:var(--cyan)}
.kc-cards strong{display:block;color:var(--cyan);margin-bottom:4px}
.kc-cards span{font-size:14px;color:var(--muted)}
.kc-aside{position:sticky;top:76px}
.kc-toc{font-size:15px}
.kc-toc h2{font-size:14px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 8px}
.kc-toc ol{margin:0;padding-left:18px}
.kc-toc li{margin:4px 0}
.kc-toc a{color:var(--text);text-decoration:none}
.kc-toc a:hover{color:var(--cyan)}
.kc-cta{display:inline-block;margin-top:10px;background:var(--cyan);color:var(--on-accent);font-weight:700;padding:10px 16px;border-radius:8px;text-decoration:none}
.kc-cite{font-size:14px;color:var(--muted)}
.kc-cite code{word-break:break-all}
.kc-notice{border-left:4px solid var(--gold)}
.kc-foot{border-top:1px solid var(--line);padding:24px 20px;text-align:center;color:var(--muted);font-size:14px}
.kc-foot a{color:var(--muted)}
.kc-hero{padding:8px 0 18px}
.kc-hero p{font-size:19px;color:var(--muted);max-width:820px}
.kc-search{display:flex;gap:8px;max-width:640px;margin:14px 0}
.kc-search input{flex:1;padding:12px 14px;border-radius:8px;border:1px solid var(--line);background:var(--panel);color:var(--text);font:inherit}
.kc-cat{margin:34px 0}
.kc-cat h2{display:flex;align-items:baseline;gap:10px;font-size:24px;margin:0 0 6px}
.kc-cat h2 small{font-size:14px;color:var(--muted);font-weight:400}
.kc-cat>p{color:var(--muted);margin:0 0 12px}
.kc-more{columns:3 220px;font-size:15px;padding-left:18px}
.kc-badge{display:inline-block;font-size:12px;padding:2px 8px;border-radius:20px;background:var(--panel2);border:1px solid var(--line);color:var(--teal);margin-left:6px;vertical-align:middle}
@media (max-width:920px){.kc-grid{grid-template-columns:minmax(0,1fr)}.kc-aside{position:static}.kc-top{padding:8px 16px;flex-wrap:wrap;gap:4px}.kc-nav{margin-left:0;width:100%;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none}.kc-nav a{padding:6px 10px;font-size:14px;white-space:nowrap}}
@media (max-width:520px){body{font-size:16px}.kc-wrap{padding:16px 16px 48px}.kc-article h2{font-size:22px}}
@media print{.kc-top,.kc-aside,.kc-foot,.skip-link{display:none}.kc-grid{display:block}body{background:#fff;color:#000}}
.kc-figure .sv-line{stroke:var(--cyan)}.kc-figure .sv-text{fill:var(--text)}.kc-figure .sv-muted{fill:var(--muted)}
.kc-figure .sv-accent{fill:var(--gold)}.kc-figure .sv-accent-stroke{stroke:var(--gold)}.kc-figure .sv-teal{fill:var(--teal)}.kc-figure .sv-teal-stroke{stroke:var(--teal)}