:root{--ink:#18181b;--ink-2:#3f3f46;--muted:#63636b;--paper:#fafaf9;--paper-2:#f2f2f0;--grid:#edece8;--line:#dcdbd6;--edge:#e2e1dd;--white:#fff;--green:#0f766e;--green-dark:#0b5952;--green-soft:#e2f2ef;--orange:#ea580c;--orange-dark:#9a3412;--orange-soft:#fdede3;--blue:#2563eb;--blue-soft:#e8eefc;--purple:#6d28d9;--board:#18181b;--board-2:#27272a;--font-display:"Inter Tight",system-ui,sans-serif;--font-body:"Inter",system-ui,sans-serif;--font-math:"JetBrains Mono",ui-monospace,monospace;--w-display:700;--w-btn:600;--radius:14px;--r:10px;--r-sm:8px;--r-xs:6px;--bw:1px;--shadow:0 1px 2px rgba(24,24,27,.04),0 2px 8px rgba(24,24,27,.06);--shadow-sm:0 1px 2px rgba(24,24,27,.05);--shadow-press:none;--press:scale(.98);--lift:translateY(-1px);--grid-size:28px}*,:after,:before{box-sizing:border-box}body,html{background-color:var(--paper);background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:var(--grid-size) var(--grid-size);color:var(--ink);font-family:var(--font-body);font-size:17px;line-height:1.5;margin:0}a{color:var(--green)}a:hover{color:var(--green-dark)}:focus-visible{outline:3px solid var(--blue);outline-offset:2px}h1,h2,h3{font-family:var(--font-display);line-height:1.1;margin:0}h1{font-size:clamp(32px,5vw,48px);font-weight:var(--w-display);letter-spacing:-.025em}h2{font-size:24px;font-weight:600}.math{font-family:var(--font-math)}.eyebrow,.muted{color:var(--muted)}.eyebrow{font-size:13px;font-weight:700;letter-spacing:.1em;text-transform:uppercase}.sr-only{height:1px;overflow:hidden;position:absolute;width:1px;clip:rect(0 0 0 0);white-space:nowrap}.page{margin:0 auto;max-width:1180px;padding:32px 24px 64px}@media(max-width:640px){.page{padding:20px 16px 48px}.card{padding:16px}}.stack{flex-direction:column;gap:16px}.row,.stack{display:flex}.row{align-items:center;flex-wrap:wrap;gap:12px}.card{border:var(--bw) solid var(--edge);border-radius:var(--radius);padding:20px}.btn,.card{background:var(--white);box-shadow:var(--shadow)}.btn{align-items:center;border:var(--bw) solid var(--edge);border-radius:var(--r);cursor:pointer;display:inline-flex;font:var(--w-btn) 17px var(--font-body);gap:8px;justify-content:center;min-height:48px;padding:0 22px;text-decoration:none;transition:transform 80ms ease,box-shadow 80ms ease}.btn,.btn:hover{color:var(--ink)}.btn:hover{background:var(--paper-2)}.btn:active{box-shadow:var(--shadow-press);transform:var(--press)}.btn[disabled],.btn[disabled]:hover{background:var(--paper-2);border-color:var(--edge);box-shadow:none;color:var(--muted);cursor:not-allowed;transform:none}.btn-primary{background:var(--green);border-color:var(--green);color:var(--white)}.btn-primary:hover{background:var(--green-dark);color:var(--white)}.chip{align-items:center;background:var(--paper-2);border-radius:999px;display:inline-flex;font-size:14px;font-weight:700;gap:6px;padding:6px 12px}.chip-green{background:var(--green-soft);color:var(--green-dark)}.chip-orange{background:var(--orange-soft);color:var(--orange-dark)}.chip-blue{background:var(--blue-soft);color:#1e3a8a}.progress{background:var(--grid);border-radius:4px;height:8px;overflow:hidden}.progress>span{background:var(--green);display:block;height:100%}.field{background:var(--white);border:var(--bw) solid var(--edge);border-radius:var(--r-sm);color:var(--ink);font:500 18px var(--font-math);min-height:44px;padding:0 12px}.field:focus{border-color:var(--green);box-shadow:0 0 0 3px var(--green-soft);outline:none}.field:disabled{background:var(--paper-2);color:var(--muted);cursor:not-allowed}.field.area,.field.sel,.field.text{font:400 16px/1.4 var(--font-body)}label>.field{width:100%}select.field{-moz-appearance:none;appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='none' stroke='%2371717a' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.6' d='m1 1.5 5 5 5-5'/%3E%3C/svg%3E");background-position:right 12px center;background-repeat:no-repeat;cursor:pointer;min-width:0;padding-right:34px;text-overflow:ellipsis;white-space:nowrap}select.field[multiple]{background-image:none;height:auto;padding:6px;white-space:normal}select.field[multiple] option{border-radius:var(--r-xs);padding:6px 8px}select.field[multiple] option:checked{background:var(--green-soft);color:var(--green-dark)}textarea.field{min-height:0;padding:10px 12px;resize:vertical}.field.is-right{background:var(--green-soft);border-color:var(--green)}.field.is-wrong{background:var(--orange-soft);border-color:#c2410c}.rich sub,.rich sup{font-size:.7em}.rich table{border-collapse:collapse;margin:8px 0}.rich td,.rich th{border:1px solid var(--line);padding:4px 8px}.rich p{margin:0 0 8px}