:root{--paper:#f4fbf5;--card:#fff;--ink:#0d2a17;--muted:#4b6a55;--blue:#0b8a2e;--blue-soft:#e2f6e6;--sun:#2bd14a;--line:#cfe8d4}
*{box-sizing:border-box}
html{background:var(--paper)}
body{margin:0;color:var(--ink);font-family:Manrope,"Segoe UI",system-ui,-apple-system,sans-serif;line-height:1.6;background:radial-gradient(60% 50% at 85% 0%,rgba(43,209,74,.12),transparent 70%),linear-gradient(rgba(11,138,46,.05) 1px,transparent 1px) 0 0/24px 24px,linear-gradient(90deg,rgba(11,138,46,.05) 1px,transparent 1px) 0 0/24px 24px,var(--paper)}
a{color:var(--blue)}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.top{background:rgba(255,255,255,.85);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5;backdrop-filter:blur(6px)}
.top .wrap{display:flex;align-items:center;gap:16px;min-height:64px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-size:1.2rem;margin-right:auto}
.brand img{border-radius:50%;box-shadow:0 2px 8px rgba(0,120,40,.2)}
.menu{display:flex;gap:4px;flex-wrap:wrap}
.menu a{text-decoration:none;color:var(--ink);font-weight:700;padding:8px 14px;border-radius:999px}
.menu a:hover{background:var(--blue-soft);color:var(--blue)}
.bc{font-size:.85rem;color:var(--muted);margin:22px 0 6px}
.bc a{color:var(--muted)}
h1{font-size:clamp(1.8rem,4vw,2.6rem);line-height:1.15;margin:6px 0 14px;letter-spacing:-.01em}
h2{font-size:1.35rem;margin:34px 0 12px}
.lead{font-size:1.1rem;color:var(--muted);max-width:70ch}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:20px 0}
.card{background:var(--card);border:2px solid var(--line);border-radius:16px;padding:18px;display:flex;flex-direction:column;gap:8px;transition:border-color .12s,transform .12s}
.card:hover{border-color:var(--blue);transform:translateY(-2px)}
.card h3{margin:0;font-size:1.1rem}
.card p{margin:0;color:var(--muted);font-size:.95rem;flex:1}
.btn{align-self:flex-start;display:inline-block;text-decoration:none;font-weight:800;padding:9px 16px;border-radius:12px;background:var(--sun);color:#0c2a20;border:2px solid #0c2a20}
.btn:hover{filter:brightness(1.05)}
.btn.big{font-size:1.05rem;padding:13px 22px;box-shadow:4px 4px 0 #0c2a20;margin-top:10px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips a{text-decoration:none;font-weight:700;padding:7px 14px;border-radius:999px;background:var(--card);border:1.5px solid var(--line);color:var(--ink)}
.chips a:hover{border-color:var(--blue);color:var(--blue)}
.ch{list-style:none;padding:0;columns:2 320px;column-gap:28px}
.ch>li{break-inside:avoid;margin-bottom:14px;background:var(--card);border:1.5px solid var(--line);border-radius:14px;padding:12px 16px}
.ch ul{margin:6px 0 0;padding-left:18px;color:var(--muted);font-size:.93rem}
.ticks,.ex{padding-left:20px}.ticks li,.ex li{margin:5px 0}
.ex li{font-family:"Cambria Math","Times New Roman",serif;font-size:1.05rem}
.note{color:var(--muted);font-size:.9rem}
.foot{margin-top:60px;border-top:1px solid var(--line);background:rgba(255,255,255,.7);padding:30px 0 40px;font-size:.9rem}
.foot .wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px}
.foot b{display:block;margin-bottom:6px}
.foot a{display:block;color:var(--muted);text-decoration:none;padding:2px 0}
.foot a:hover{color:var(--blue)}
.foot p{color:var(--muted);margin:10px 0 0}
@media (max-width:620px){.menu{width:100%}.menu a{padding:6px 10px}}
.exq{background:var(--card);border:2px solid var(--line);border-radius:16px;padding:16px 18px;margin:14px 0}
.exq h3{margin:0 0 8px;font-size:1rem;color:var(--blue)}
.stmt{font-size:1.05rem}
.opts{margin:8px 0;padding-left:22px}
.opts li{margin:3px 0}
details{margin:10px 0 0;border-top:1px dashed var(--line);padding-top:8px}
summary{cursor:pointer;font-weight:800;color:var(--blue)}
details ol,details ul{margin:8px 0;padding-left:22px}
.ans{margin:8px 0 0;background:var(--blue-soft);border-radius:10px;padding:8px 12px}
.qz,.sl{padding-left:24px}
.qz>li,.sl>li{background:var(--card);border:1.5px solid var(--line);border-radius:14px;padding:10px 16px;margin:10px 0}
.qz>li>p,.sl>li>p{margin:4px 0;font-weight:600}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:34px 0 0}
.pn a{display:block;background:var(--card);border:2px solid var(--line);border-radius:14px;padding:12px 16px;text-decoration:none;color:var(--ink);font-weight:700}
.pn a:hover{border-color:var(--blue)}
.pn small{display:block;color:var(--muted);font-weight:600}
.pn .next{text-align:right}
.lst{columns:2 280px;column-gap:24px;padding-left:20px}
.lst li{margin:4px 0}
.ch a{color:var(--ink);text-decoration:none}
.ch a:hover{color:var(--blue);text-decoration:underline}
sup,sub{line-height:0}
@media (max-width:620px){.pn{grid-template-columns:1fr}.pn .next{text-align:left}}