:root{--ink:#1B2A41;--muted:#5a6b86;--accent:#2563B0;--accent-d:#1d4e8f;--teal:#0e9488;--gold:#f59e0b;--bg:#F7F4EC;--card:#fff;--line:#e7e3d8;--navy:#12233c}
*{box-sizing:border-box}
body{margin:0;font:16px/1.65 Inter,system-ui,'Segoe UI',Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg)}
.shell{max-width:880px;margin:0 auto;padding:0 20px}
header.site{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:14px;padding:11px 0}
.brand{display:flex;align-items:center;gap:10px;font-family:Sora,Inter,sans-serif;font-weight:800;font-size:19px;color:var(--ink);text-decoration:none}
.brand:hover{text-decoration:none}
.mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--accent),var(--teal) 55%,var(--gold));display:flex;align-items:center;justify-content:center;font-size:17px}
.brand b{color:var(--accent)}
.nav{margin-inline-start:auto;display:flex;align-items:center;gap:16px;font-size:14px}
.nav a{color:var(--muted);text-decoration:none;font-weight:600}.nav a:hover{color:var(--accent)}
.nav a.play{background:var(--accent);color:#fff;padding:8px 18px;border-radius:999px}.nav a.play:hover{background:var(--accent-d);color:#fff}
main{max-width:880px;margin:0 auto;padding:26px 20px 56px}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
h1{font-family:Sora,Inter,sans-serif;font-size:clamp(28px,5vw,36px);line-height:1.18;letter-spacing:-.5px;margin:16px 0 10px}
h2{font-family:Sora,Inter,sans-serif;font-size:21px;margin:34px 0 10px}
.muted{color:var(--muted)}
nav.muted{font-size:13.5px}nav.muted a{color:var(--muted)}
.cta{display:inline-block;margin:10px 0;padding:13px 26px;background:linear-gradient(135deg,var(--accent),var(--accent-d));color:#fff;border-radius:12px;font-weight:700;box-shadow:0 6px 18px rgba(37,99,176,.28)}
.cta:hover{filter:brightness(1.08);text-decoration:none}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px 24px;margin:16px 0;box-shadow:0 2px 10px rgba(27,42,65,.05)}
ol.quiz{list-style:none;padding:0;margin:12px 0 4px;display:grid;grid-template-columns:1fr 1fr;gap:10px;counter-reset:q}
ol.quiz li{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 14px;font-weight:600;counter-increment:q}
ol.quiz li::before{content:counter(q,upper-alpha) '. ';color:var(--accent);font-weight:700}
@media(max-width:560px){ol.quiz{grid-template-columns:1fr}}
details{margin-top:8px}summary{cursor:pointer;color:var(--accent);font-weight:700}details[open] summary{margin-bottom:4px}
ul.cols{columns:2;gap:28px;padding-inline-start:18px}@media(max-width:520px){ul.cols{columns:1}}
ul.cols li{margin:3px 0}
table{border-collapse:collapse;width:100%;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}
td{padding:9px 14px;border-bottom:1px solid var(--line)}tr:last-child td{border-bottom:0}tr:first-child td{background:var(--bg)}
.note{background:var(--card);border-inline-start:3px solid var(--accent);border-radius:8px;padding:10px 14px;color:var(--muted);font-size:14px}
.hero{text-align:center;padding:26px 0 8px}
.badge{display:inline-block;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:6px 16px;font-size:13.5px;font-weight:600;color:var(--muted)}
.lead{font-size:18px;color:var(--muted);max-width:640px;margin:10px auto 4px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:14px 0}
@media(max-width:640px){.grid{grid-template-columns:1fr 1fr}}
.tile{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:15px 16px;font-weight:700;color:var(--ink);box-shadow:0 2px 10px rgba(27,42,65,.05)}
.tile:hover{text-decoration:none;border-color:var(--accent);box-shadow:0 6px 18px rgba(37,99,176,.15)}
.tile .ti{font-size:22px}
footer.site{margin-top:56px;background:var(--navy);color:#b9c6da;font-size:14px}
footer.site .shell{padding:28px 20px 32px}
footer.site a{color:#dbe6f5}footer.site a:hover{color:#fff}
.fbrand{font-family:Sora,Inter,sans-serif;font-weight:800;font-size:17px;color:#fff;display:flex;align-items:center;gap:9px;margin-bottom:10px}
.fbrand .mark{width:28px;height:28px;font-size:14px;border-radius:8px}
.flinks{margin:6px 0 14px}.flinks a{margin-inline-end:16px;font-weight:600}
.langs a{display:inline-block;border:1px solid #2c405f;border-radius:999px;padding:3px 11px;margin-inline-end:6px;margin-block:2px;font-size:12.5px}
.fam{color:#8ea3c0;font-size:13px;margin-top:12px}