:root{--ink:#17466e;--muted:#54758c;--teal:#159fa9;--line:rgba(23,70,110,.16)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;line-height:1.65;background:radial-gradient(circle at 15% 3%,rgba(112,227,239,.25),transparent 28%),linear-gradient(180deg,#f7fdff,#eafaff)}a{color:#116d9f}a:hover{text-decoration:underline}.wrap{width:min(1050px,calc(100% - 32px));margin:auto}.masthead{display:flex;gap:18px;justify-content:space-between;align-items:center;min-height:82px}.masthead img{width:180px;display:block}.masthead nav{display:flex;gap:16px;flex-wrap:wrap;font-weight:800;font-size:14px}.masthead a{text-decoration:none}.crumbs{font-size:13px;color:var(--muted);padding:18px 0}.hero{padding:30px 0 42px}.eyebrow{color:#168e9d;font-size:12px;letter-spacing:.12em;font-weight:900}.hero h1{font-size:clamp(36px,5.4vw,65px);line-height:1.08;letter-spacing:-.04em;margin:12px 0 16px}.hero p{font-size:19px;color:var(--muted);max-width:800px}.hero-art{width:min(400px,100%);margin:12px 0 2px;display:block;max-height:160px;object-fit:contain}.main-layout{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:36px;align-items:start}.article{background:rgba(255,255,255,.92);border:1px solid var(--line);padding:clamp(20px,4vw,46px);border-radius:26px;box-shadow:0 16px 45px rgba(24,97,127,.08)}.article h2{font-size:clamp(23px,3vw,30px);line-height:1.25;margin:36px 0 13px}.article h2:first-child{margin-top:0}.article h3{font-size:20px;margin:24px 0 8px}.article p,.article li{color:#355a72}.article li{margin-bottom:8px}.article strong{color:#17466e}.article figure{margin:24px 0}.article figcaption{font-size:13px;color:#54758c;text-align:center}.article figure img{display:block;width:min(100%,560px);max-height:200px;object-fit:contain;margin:auto}.article .rule{display:flex;align-items:center;gap:10px;flex-wrap:wrap;border-radius:20px;background:#effbff;padding:18px;margin:18px 0}.rule img{width:68px;height:68px;object-fit:contain}.rule span{font-size:24px;font-weight:900;color:#138ba2}.mini-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:18px 0}.mini-card{border-radius:18px;border:1px solid var(--line);padding:20px;background:#f5fcff}.mini-card h3{margin:6px 0}.mini-card img{width:60px;height:60px;object-fit:contain}.mini-card p{margin:8px 0 0}.note{padding:18px;border-left:4px solid #17b6c1;background:#edfaff;border-radius:4px 15px 15px 4px}.sidebar{position:sticky;top:20px;border-radius:22px;background:#fff;border:1px solid var(--line);padding:22px}.sidebar a{display:block;padding:7px 0;text-decoration:none;font-size:14px}.sidebar strong{display:block;margin-bottom:10px}.cta{margin:30px 0;padding:28px;border-radius:24px;background:linear-gradient(130deg,#17466e,#1488d5);color:#fff}.cta p{color:#d4eefe}.button{display:inline-block;border-radius:12px;background:#39dc68;color:#074122;font-weight:900;padding:12px 20px;text-decoration:none}.button:hover{text-decoration:none;background:#73f194}footer{display:flex;gap:15px;align-items:center;justify-content:space-between;flex-wrap:wrap;padding:42px 0;color:var(--muted);font-size:13px}footer img{width:120px}footer nav{display:flex;gap:14px;flex-wrap:wrap}.two-puzzles{display:flex;gap:18px;align-items:center;flex-wrap:wrap}.two-puzzles img{width:85px;height:85px;object-fit:contain}@media(max-width:820px){.main-layout{grid-template-columns:1fr}.sidebar{position:static;order:-1}.masthead{align-items:flex-start;padding-top:22px;flex-direction:column}.mini-grid{grid-template-columns:1fr}.rule img{width:54px;height:54px}}
/* Language selector shared by the translated public guides */
.masthead nav{align-items:center}.language-control{display:inline-flex;align-items:center;gap:7px;border:1px solid rgba(23,70,110,.18);padding:5px 9px;border-radius:12px;background:#fff;font-size:14px}.language-control select{border:0;background:transparent;color:#17466e;font:inherit;max-width:180px;cursor:pointer}.article h2[id]{scroll-margin-top:24px}.article ul,.article ol{padding-left:24px}.article a{overflow-wrap:anywhere}