:root{--coral:#FF693D;--coral-d:#EA5230;--ink:#1C1C28;--muted:#6B6B7B;--bg:#F7F6F9;
--surface:#fff;--line:#ECEAF0;--phy:#3B6FE0;--che:#12A594;--mat:#7C5CFC;
--bot:#2E9E5B;--zoo:#C77D0A;--r:14px}
*{margin:0;box-sizing:border-box}
body{font-family:Inter,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65}
.wrap{max-width:980px;margin:0 auto;padding:0 20px}
nav{position:sticky;top:0;z-index:50;background:rgba(247,246,249,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;gap:10px;padding:12px 20px}
nav .logo{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,#5B54F2,#7C3AED);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800}
nav .links{margin-left:auto;display:flex;gap:18px;align-items:center;font-size:14px;flex-wrap:wrap}
nav a{color:var(--ink);text-decoration:none;font-weight:600}
nav a.btn{background:var(--coral);color:#fff;padding:8px 16px;border-radius:999px}
main{padding:34px 0 60px}
h1{font-size:clamp(26px,4.5vw,38px);line-height:1.2;letter-spacing:-.5px;margin-bottom:10px}
h2{font-size:21px;margin:34px 0 10px;letter-spacing:-.3px}
p{color:#3a3a46;margin:10px 0;max-width:74ch}
.sub{color:var(--muted);font-size:15px}
.stats{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:12px 16px}
.stat b{font-size:20px;display:block}
.stat span{font-size:12px;color:var(--muted)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px 20px;margin:14px 0}
table{width:100%;border-collapse:collapse;background:var(--surface);border-radius:var(--r);overflow:hidden;border:1px solid var(--line);font-size:14.5px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line)}
th{font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted)}
tr:last-child td{border-bottom:none}
td a{color:var(--ink);font-weight:600;text-decoration:none}
td a:hover{color:var(--coral)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}
.chip{background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:6px 13px;font-size:13px}
.cta{display:inline-block;background:var(--coral);color:#fff;font-weight:700;padding:13px 26px;border-radius:999px;text-decoration:none;margin:16px 0}
.cta.ghost{background:transparent;color:var(--coral);border:1.5px solid var(--coral)}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted);text-decoration:none}
.tag{display:inline-block;font-size:11px;font-weight:700;border-radius:6px;padding:2px 8px;margin-left:6px;vertical-align:middle}
.t11{background:#E4F6F3;color:#0B7E71}.t12{background:#EDE9FE;color:#6D4AEF}
.formula{background:#17141F;color:#E8E6F0;border-radius:var(--r);padding:14px 18px;font-family:ui-monospace,Menlo,monospace;font-size:14px;overflow-x:auto;margin:12px 0;white-space:pre-wrap}
footer{border-top:1px solid var(--line);padding:26px 0;color:var(--muted);font-size:13.5px}
footer .wrap{display:flex;gap:16px;flex-wrap:wrap}
footer a{color:var(--muted)}
.subjdot{display:inline-block;width:9px;height:9px;border-radius:3px;margin-right:7px}
.calc{display:flex;gap:14px;flex-wrap:wrap;margin:10px 0}
.calc label{font-size:13px;color:var(--muted);font-weight:600}
.calc input{display:block;margin-top:4px;width:110px;font:inherit;font-size:16px;padding:9px 12px;
border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink)}
ul{margin:10px 0 10px 22px;color:#3a3a46;max-width:74ch}li{margin:6px 0}
/* ---- the teacher cluster (2026-08-25). Additive only: every selector below is
   new, so no existing page changes appearance when this stylesheet is rebuilt. */
h3{font-size:16.5px;margin:22px 0 6px;letter-spacing:-.2px}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:14px;margin:16px 0}
.grid2 .card{margin:0}
ol.steps{counter-reset:s;list-style:none;padding:0;margin:16px 0 16px 0}
ol.steps li{position:relative;padding:0 0 0 44px;margin:0 0 18px}
ol.steps li::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:1px;width:28px;height:28px;border-radius:50%;background:var(--coral);color:#fff;font-weight:800;font-size:13.5px;display:flex;align-items:center;justify-content:center}
ol.steps li b{display:block;margin-bottom:2px}
ol.steps li p{margin:4px 0}
ul.plain{margin:10px 0 10px 22px;padding:0}
ul.plain li{margin:7px 0}
.note{background:#FFF7F3;border:1px solid #FFD9CC;border-radius:var(--r);padding:14px 18px;margin:18px 0}
.note p{margin:6px 0}
.msg{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--che);border-radius:10px;padding:15px 17px;margin:12px 0;white-space:pre-wrap;font-family:ui-monospace,Menlo,monospace;font-size:13.5px;line-height:1.7;color:#2c2c36;overflow-x:auto}
.brandlock{display:flex;align-items:center;gap:9px;text-decoration:none;color:inherit;flex:none}
/* The supplied lockup is one piece of artwork, mark and wordmark together,
   at 1421x553. It is sized by HEIGHT and left to find its own width; giving
   it the square .vmark box would squash it to a third of its length. */
.brandlock .vlock{height:38px;width:auto;flex:none;display:block}
/* the same wordmark treatment the desk header uses, so the two surfaces
   spell the product the same way */
.cols{list-style:none;padding:0;margin:14px 0;display:grid;gap:2px 22px;
 grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.cols li{display:flex;justify-content:space-between;gap:12px;padding:5px 0;
 border-bottom:1px solid var(--line)}
.cols li span{color:var(--muted);font-variant-numeric:tabular-nums;flex:none}
.tbl-scroll{overflow-x:auto;margin:14px 0}
code{font-family:ui-monospace,Menlo,monospace;font-size:.9em;background:#EFEDF3;border-radius:5px;padding:1px 5px}