:root{--ink:#1b2430;--ink2:#5b6472;--bg:#f6f5f1;--card:#ffffff;--accent:#e05d10;
--accent-dark:#b84a0a;--accent-soft:#fdeee2;--line:#e6e2da;--ok:#166534;--okbg:#ecfdf3;--okline:#bbe7c9;
--head:#1b2430;--head2:#2a3648;--headtx:#ffffff;--headtx2:#c6cedb;--shadow:0 1px 3px rgba(20,25,35,.06);
--shadow-lg:0 8px 24px rgba(20,25,35,.10);color-scheme:light}
html[data-theme=dark]{--ink:#e8eaf0;--ink2:#9aa4b5;--bg:#12161d;--card:#1b212b;--accent:#ff7a2f;
--accent-dark:#ff9557;--accent-soft:#2a2019;--line:#2a3342;--ok:#6ee7a0;--okbg:#12291c;--okline:#1e4630;
--head:#0d1117;--head2:#1b2430;--headtx:#f2f4f8;--headtx2:#9aa4b5;--shadow:0 1px 3px rgba(0,0,0,.4);
--shadow-lg:0 8px 24px rgba(0,0,0,.5);color-scheme:dark}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
color:var(--ink);background:var(--bg);line-height:1.65;font-size:17px;
transition:background .25s ease,color .25s ease}
a{color:var(--accent-dark);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:880px;margin:0 auto;padding:0 18px}
header.site{background:var(--head);color:var(--headtx);padding:14px 0;position:sticky;top:0;z-index:50;
box-shadow:0 1px 0 rgba(255,255,255,.06),0 2px 12px rgba(0,0,0,.15)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px}
.logo{font-weight:800;font-size:1.28rem;color:var(--headtx);letter-spacing:-.03em;white-space:nowrap}
.logo span{color:var(--accent)}
.hdr-right{display:flex;align-items:center;gap:6px}
nav.top a{color:var(--headtx2);margin-right:12px;font-size:.95rem}
nav.top a:hover{color:var(--headtx);text-decoration:none}
.mode{background:transparent;border:1.5px solid rgba(155,164,180,.35);color:var(--headtx2);cursor:pointer;
width:38px;height:38px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;
transition:border-color .15s,color .15s}
.mode:hover{border-color:var(--accent);color:var(--headtx)}
.mode svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
html[data-theme=dark] .mode .moon{display:none}
html[data-theme=light] .mode .sun{display:none}
.hero{background:
 repeating-linear-gradient(0deg,rgba(255,255,255,.035) 0 1px,transparent 1px 34px),
 repeating-linear-gradient(90deg,rgba(255,255,255,.035) 0 1px,transparent 1px 34px),
 linear-gradient(160deg,var(--head) 0%,var(--head2) 100%);
color:#fff;padding:52px 0 58px;text-align:center}
.hero h1{font-size:2.3rem;letter-spacing:-.03em;margin-bottom:12px;color:#fff}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{color:var(--headtx2);max-width:640px;margin:0 auto;font-size:1.05rem}
.hero .badge{display:inline-block;margin-bottom:18px;font-size:.8rem;font-weight:700;letter-spacing:.08em;
text-transform:uppercase;color:var(--accent);border:1px solid color-mix(in srgb,var(--accent) 45%,transparent);
padding:4px 12px;border-radius:99px}
main{padding:36px 0 20px}
h1.tool{font-size:1.8rem;letter-spacing:-.02em;margin-bottom:6px}
.sub{color:var(--ink2);margin-bottom:22px}
.calc{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;margin-bottom:30px;box-shadow:var(--shadow-lg)}
.calc h2{font-size:.85rem;margin-bottom:16px;color:var(--ink2);text-transform:uppercase;letter-spacing:.08em}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:560px){.grid2{grid-template-columns:1fr}}
.field label{display:block;font-size:.85rem;font-weight:600;color:var(--ink2);margin-bottom:5px}
.field input,.field select{width:100%;padding:11px 12px;font-size:1.05rem;border:1.5px solid var(--line);
border-radius:10px;background:var(--bg);color:var(--ink);transition:border-color .15s}
.field input:focus,.field select:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.hint{font-size:.8rem;color:var(--ink2);margin-top:4px}
.result{margin-top:20px;background:var(--okbg);border:1.5px solid var(--okline);border-radius:12px;padding:18px;display:none}
.result.show{display:block;animation:pop .25s ease}
@keyframes pop{0%{transform:scale(.98);opacity:.4}100%{transform:scale(1);opacity:1}}
.result .big{font-size:1.65rem;font-weight:800;color:var(--ok);letter-spacing:-.02em}
.result .rline{margin-top:6px;color:var(--ink);opacity:.85;font-size:.98rem}
.note{font-size:.85rem;color:var(--ink2);margin-top:14px}
article.body h2{font-size:1.35rem;margin:32px 0 10px;letter-spacing:-.01em}
article.body h3{font-size:1.1rem;margin:20px 0 8px}
article.body p{margin-bottom:14px}
article.body ul,article.body ol{margin:0 0 14px 24px}
article.body li{margin-bottom:6px}
article.body strong{color:var(--ink)}
.example{background:var(--card);border-left:4px solid var(--accent);border-radius:0 12px 12px 0;
padding:14px 16px;margin:16px 0;border-top:1px solid var(--line);border-right:1px solid var(--line);
border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
.faq{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:8px 22px;margin:16px 0;box-shadow:var(--shadow)}
.faq h3{font-size:1rem;margin:14px 0 6px}
.faq p{color:var(--ink2);margin-bottom:14px}
.related{margin:36px 0}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(235px,1fr));gap:14px;margin-top:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;position:relative;
overflow:hidden;transition:box-shadow .18s,transform .18s,border-color .18s;box-shadow:var(--shadow)}
.card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent);
opacity:0;transition:opacity .18s}
.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px);border-color:color-mix(in srgb,var(--accent) 35%,var(--line))}
.card:hover::before{opacity:1}
.card a{font-weight:700;color:var(--ink);display:block;margin-bottom:4px}
.card a::after{content:"";position:absolute;inset:0}
.card p{font-size:.86rem;color:var(--ink2)}
.cat{margin:34px 0 4px;font-size:1.15rem;display:flex;align-items:center;gap:10px}
.cat svg{width:21px;height:21px;fill:none;stroke:var(--accent);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}
.adslot{margin:26px auto;text-align:center;min-height:0}
.crumb{font-size:.85rem;color:var(--ink2);margin-bottom:16px}
footer.site{background:var(--head);color:var(--headtx2);margin-top:48px;padding:32px 0;font-size:.9rem}
footer.site a{color:var(--headtx2);margin-right:16px}
footer.site a:hover{color:var(--headtx)}
footer.site .cols{display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px}
.btn{display:inline-block;background:var(--accent);color:#fff;font-weight:700;border:none;cursor:pointer;
padding:12px 24px;font-size:1.02rem;border-radius:10px;margin-top:16px;transition:filter .15s,transform .1s}
.btn:hover{filter:brightness(.92)}
.btn:active{transform:scale(.98)}
html[data-theme=dark] .btn{color:#12161d}
@media(max-width:640px){.hero h1{font-size:1.7rem}nav.top a{margin-right:8px;font-size:.88rem}}