:root{--bg:#f6f8fb;--surface:#ffffff;--surface-2:#eef2f7;--text:#0f172a;--muted:#64748b;--border:#e2e8f0;--primary:#2563eb;--primary-600:#1d4ed8;--accent:#0ea5a4;--danger:#dc2626;--success:#16a34a;--radius:16px;--shadow:0 10px 30px rgba(15, 23, 42, 0.08)}@media (prefers-color-scheme:dark){:root{--bg:#0b1120;--surface:#111a2e;--surface-2:#17223b;--text:#e6edf6;--muted:#93a3bb;--border:#22304d;--primary:#3b82f6;--primary-600:#2563eb;--shadow:0 10px 30px rgba(0, 0, 0, 0.35)}}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.55;-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}code{background:var(--surface-2);padding:2px 6px;border-radius:6px;font-size:.9em}.container{max-width:1120px;margin:0 auto;padding:0 20px}.topbar{position:sticky;top:0;z-index:50;backdrop-filter:saturate(180%) blur(12px);background:color-mix(in srgb,var(--surface) 82%,transparent);border-bottom:1px solid var(--border)}.topbar__inner{max-width:1120px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:flex;align-items:center;gap:12px}.brand__logo{height:34px;width:auto}.brand__logo--n7{height:30px}.brand__divider{width:1px;height:26px;background:var(--border)}.topbar__actions{display:flex;align-items:center;gap:10px}.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid transparent;border-radius:999px;padding:9px 16px;font-size:14px;font-weight:600;cursor:pointer;background:var(--surface-2);color:var(--text);transition:transform 50ms,background .15s,opacity .15s}.btn:hover{text-decoration:none}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn--primary{background:var(--primary);color:#fff}.btn--primary:hover{background:var(--primary-600)}.btn--ghost{background:0 0;border-color:var(--border)}.btn--small{padding:6px 12px;font-size:13px}.btn--danger{background:0 0;border-color:var(--danger);color:var(--danger)}.userchip{display:flex;align-items:center;gap:8px;background:var(--surface-2);border-radius:999px;padding:4px 8px 4px 4px;font-weight:600;font-size:14px}.userchip img{width:28px;height:28px;border-radius:50%}.userchip__logout{border:none;background:0 0;color:var(--muted);font-size:18px;line-height:1;cursor:pointer;padding:0 4px}.hero{padding:56px 0 24px;text-align:center}.hero__kicker{color:var(--accent);font-weight:700;letter-spacing:.04em;text-transform:uppercase;font-size:12.5px;margin:0 0 10px}.hero__title{font-size:clamp(30px, 5vw, 46px);margin:0 0 12px;letter-spacing:-.02em}.hero__subtitle{max-width:720px;margin:0 auto;color:var(--muted);font-size:17px}.section{padding:36px 0}.section__head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:18px;flex-wrap:wrap}.section__head h2{margin:0;font-size:22px}.section__head p{margin:0;color:var(--muted)}.grid{display:grid;gap:18px}.grid--challenges{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}.grid--teams{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));margin-top:18px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;display:flex;flex-direction:column;gap:12px;transition:transform .12s,border-color .12s}.card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--primary) 40%,var(--border))}.challenge__top{display:flex;align-items:center;gap:12px}.challenge__logo{height:34px;max-width:130px;object-fit:contain}.challenge__company{font-weight:700;font-size:13px;color:var(--muted)}.challenge__title{font-size:17px;margin:0;letter-spacing:-.01em}.challenge__desc{color:var(--muted);font-size:14px;margin:0;flex:1}.challenge__footer{display:flex;justify-content:space-between;align-items:center}.badge{font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px;background:color-mix(in srgb,var(--accent) 16%,transparent);color:var(--accent)}.badge--soon{background:color-mix(in srgb,var(--muted) 18%,transparent);color:var(--muted)}.team__title{display:flex;align-items:center;justify-content:space-between;gap:8px}.team__name{font-size:18px;margin:0}.team__challenge{font-size:12.5px;color:var(--accent);font-weight:700;text-transform:uppercase;letter-spacing:.03em}.team__members{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:6px}.team__members li{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text)}.team__members .dot{width:8px;height:8px;border-radius:50%;background:var(--success);flex:none}.team__members .dot--pending{background:var(--muted);opacity:.6}.team__members .muted{color:var(--muted);font-size:12.5px}.team__members .hash{font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace}.team__actions{display:flex;gap:8px;margin-top:4px}.teams__toolbar{display:flex;gap:12px;align-items:center}.teams__toolbar .input{flex:1}.input{width:100%;padding:10px 14px;border-radius:12px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:14px;font-family:inherit}.input:focus{outline:2px solid color-mix(in srgb,var(--primary) 45%,transparent);border-color:var(--primary)}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}.field>span{font-size:13px;font-weight:600;color:var(--muted)}.field--inline{flex-direction:row;align-items:center;gap:10px}.field--inline>span{font-weight:500;text-transform:none}.field--inline input[type=checkbox]{width:auto;accent-color:var(--primary)}.upload__progress{margin:4px 0 14px}.upload__bar{height:8px;border-radius:999px;background:var(--surface-2);overflow:hidden;margin-bottom:8px}.upload__bar span{display:block;height:100%;width:0;border-radius:999px;background:var(--primary);transition:width .2s}.emails{display:flex;flex-direction:column;gap:8px;margin-bottom:8px}.emails .email-row{display:flex;gap:8px}.muted{color:var(--muted);font-size:13px}.success{color:var(--success);font-weight:700}.hidden{display:none!important}.empty,.loginhint{text-align:center;color:var(--muted);padding:26px}.footer{border-top:1px solid var(--border);margin-top:40px;padding:26px 0}.footer__inner{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;color:var(--muted);font-size:13px}.footer__partners{display:flex;flex-wrap:wrap;gap:18px;align-items:center}.footer__partners img{height:22px;max-width:90px;object-fit:contain;opacity:.8}.modal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:20px}.modal__backdrop{position:absolute;inset:0;background:rgba(2,6,23,.55);backdrop-filter:blur(3px)}.modal__card{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:26px;width:min(520px,100%);max-height:88vh;overflow:auto;box-shadow:var(--shadow)}.modal__card h3{margin:0 0 16px}.modal__close{position:absolute;top:12px;right:14px;border:none;background:0 0;font-size:22px;color:var(--muted);cursor:pointer}.modal__actions{display:flex;justify-content:flex-end;gap:10px;margin-top:8px}.toasts{position:fixed;bottom:20px;right:20px;display:flex;flex-direction:column;gap:10px;z-index:200}.toast{background:var(--surface);border:1px solid var(--border);border-left:4px solid var(--primary);border-radius:12px;padding:12px 16px;box-shadow:var(--shadow);max-width:340px;font-size:14px;animation:.2s slidein}.toast--error{border-left-color:var(--danger)}.toast--success{border-left-color:var(--success)}@keyframes slidein{from{transform:translateY(8px);opacity:0}to{transform:none;opacity:1}}@media (max-width:640px){.brand__divider,.brand__logo--n7,.topbar__actions .btn--ghost{display:none}}