:root{--bg:#fbfaf7;--fg:#1c2220;--mut:#5d6a66;--card:#fff;--line:#e4e1d8;--green:#1f9d63;--blue:#2563c9;--gold:#c8901a;--soft:#f1efe8;--code:#14201c}
:root[data-theme=dark]{--bg:#0f1513;--fg:#e8ede9;--mut:#9aa8a2;--card:#161e1b;--line:#27332f;--green:#38c785;--blue:#6b9cf0;--gold:#e5b04a;--soft:#1a2320;--code:#0a100e}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0f1513;--fg:#e8ede9;--mut:#9aa8a2;--card:#161e1b;--line:#27332f;--green:#38c785;--blue:#6b9cf0;--gold:#e5b04a;--soft:#1a2320;--code:#0a100e}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--blue)}img{max-width:100%}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
header.top{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:16px;min-height:60px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;text-decoration:none;color:var(--fg);font-size:1.15rem;letter-spacing:-.01em}
.brand span{color:var(--green)}
nav{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto;align-items:center}
nav a{padding:6px 10px;border-radius:8px;text-decoration:none;color:var(--fg);font-size:.95rem}
nav a:hover,nav a[aria-current]{background:var(--soft)}
.tools{display:flex;gap:6px}
.tools a,.tools button{border:1px solid var(--line);background:var(--card);color:var(--fg);border-radius:8px;padding:5px 10px;font:inherit;font-size:.85rem;cursor:pointer;text-decoration:none}
.hero{padding:72px 0 48px}
.hero h1{font-size:clamp(2rem,5.5vw,3.4rem);line-height:1.1;margin:0 0 16px;letter-spacing:-.025em}
.hero p.lead{font-size:1.2rem;color:var(--mut);max-width:680px;margin:0 0 28px}
.kicker{display:inline-block;font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;color:var(--green);font-weight:700;margin-bottom:12px}
.btn{display:inline-block;padding:11px 20px;border-radius:10px;font-weight:700;text-decoration:none;color:#fff;margin:0 8px 8px 0}
.btn.g{background:#17835166;background:#178351}.btn.b{background:#2158b3}.btn.o{background:#a8760f}
.btn.ghost{background:transparent;color:var(--fg);border:1px solid var(--line)}
section{padding:40px 0}
h2{font-size:1.7rem;letter-spacing:-.015em;margin:0 0 16px}h3{margin:24px 0 8px}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px}
.card h3{margin-top:0}.card.g{border-top:4px solid var(--green)}.card.b{border-top:4px solid var(--blue)}.card.o{border-top:4px solid var(--gold)}
.band{background:var(--soft);border-block:1px solid var(--line)}
.stats{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.stats b{display:block;font-size:1.5rem;color:var(--green)}
pre,code{font-family:ui-monospace,Menlo,Consolas,monospace}
pre{background:var(--code);color:#d7f5e6;padding:14px 16px;border-radius:10px;overflow:auto;font-size:.9rem}
code{background:var(--soft);padding:1px 6px;border-radius:5px;font-size:.88em}pre code{background:none;padding:0}
blockquote{margin:16px 0;padding:8px 18px;border-left:4px solid var(--gold);background:var(--soft);border-radius:0 10px 10px 0}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}th{background:var(--soft)}
.tablewrap{overflow-x:auto}
.formula{background:var(--soft);padding:14px 18px;border-radius:10px;font-family:"Cambria Math",Georgia,serif;font-size:1.1rem;overflow-x:auto;margin:12px 0}
.bib{font-size:.93rem;color:var(--mut)}.bib li{margin:4px 0}
.toc{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 8px;padding:0;list-style:none}.toc a{display:block;padding:5px 12px;border:1px solid var(--line);border-radius:99px;text-decoration:none;font-size:.9rem}
.timeline{list-style:none;padding:0;border-left:3px solid var(--green);margin-left:6px}.timeline li{padding:0 0 16px 18px;position:relative}
.timeline li::before{content:"";position:absolute;left:-9px;top:8px;width:15px;height:15px;border-radius:50%;background:var(--green)}
footer{border-top:1px solid var(--line);padding:32px 0 48px;color:var(--mut);font-size:.9rem}
footer .grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
@media(max-width:600px){body{font-size:16px}.hero{padding:44px 0 28px}}

.brand b{font-weight:800}.logo{flex:none}
.figure{margin:0 auto;padding:0 16px 8px;text-align:center}
.art{width:100%;max-width:640px;height:auto;display:block;margin:12px auto;font-family:system-ui,sans-serif}
.art.sm{max-width:300px}
.logo-big{border-radius:50%;box-shadow:0 8px 30px rgba(0,0,0,.2)}
.tools button{width:36px;font-size:1.05rem;line-height:1;padding:5px 0}
.i-moon{display:none}
:root[data-theme=dark] .i-sun{display:none}:root[data-theme=dark] .i-moon{display:inline}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .i-sun{display:none}:root:not([data-theme=light]) .i-moon{display:inline}}
:root{color-scheme:light}:root[data-theme=dark]{color-scheme:dark}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]){color-scheme:dark}}
body,.card,header.top{transition:background-color .25s,color .25s,border-color .25s}
@media(prefers-reduced-motion:reduce){.art *{animation:none!important}html{scroll-behavior:auto}}


:root[data-theme=dark] nav a.navjoin{color:#06140d}
.ctaband{background:linear-gradient(135deg,var(--soft),var(--card));border-top:1px solid var(--line);text-align:center;padding:56px 0}
.ctaband p{max-width:560px;margin:0 auto 20px;color:var(--mut)}
.bar{gap:10px}nav{gap:2px}nav a{padding:6px 8px;font-size:.9rem}
.grid.roles{grid-template-columns:repeat(auto-fit,minmax(215px,1fr))}
@media(max-width:1080px){.bar{row-gap:4px}nav{margin-left:0;width:100%;order:3}.tools{margin-left:auto}}
/* --- conversion Open Collective --- */
.btn.o{background:#b07a0c;color:#fff}.btn.o:hover{filter:brightness(1.1)}
:root[data-theme=dark] .btn.o{background:#e5b04a;color:#1b1303}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .btn.o{background:#e5b04a;color:#1b1303}}
.btn.big{padding:15px 28px;font-size:1.1rem;border-radius:12px}
.micro{margin:6px 0 0;color:var(--mut);font-size:.92rem}
.proof{text-align:center;padding:18px 0}.proof p{margin:0}.proof [data-oc-stats]{font-size:1.5rem;font-weight:800;color:var(--green)}.proof small{color:var(--mut)}
.split{display:grid;gap:24px;grid-template-columns:minmax(200px,300px) 1fr;align-items:center}
@media(max-width:700px){.split{grid-template-columns:1fr}}
.grid.tiers{grid-template-columns:repeat(auto-fit,minmax(175px,1fr))}
.tier{display:flex;flex-direction:column;position:relative;border-top:4px solid var(--gold)}
.tier h3{margin:4px 0 6px}.tier p{flex:1;color:var(--mut);margin:0 0 14px}.tier .btn{align-self:flex-start;margin:0}
.price{font-size:1.3rem;font-weight:800;color:var(--fg);white-space:nowrap}
.tier.first{border-color:var(--gold);box-shadow:0 0 0 2px var(--gold) inset}
.tag{position:absolute;top:-12px;right:12px;background:var(--gold);color:#1b1303;font-size:.75rem;font-weight:700;padding:3px 10px;border-radius:99px}
details{border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:10px 0;background:var(--card)}
summary{cursor:pointer;font-weight:700}details p{margin:10px 0 2px;color:var(--mut)}
.ctaband .btn{margin:6px}
.tools a.navjoin{background:#b07a0c;border-color:#b07a0c;color:#fff;font-weight:700;padding:6px 14px}
:root[data-theme=dark] .tools a.navjoin{background:#e5b04a;border-color:#e5b04a;color:#1b1303}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .tools a.navjoin{background:#e5b04a;border-color:#e5b04a;color:#1b1303}}
.grid.fin{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.fin .card{text-align:left}.fin .num{font-size:1.7rem;font-weight:800;color:var(--green);white-space:nowrap}
.fin .card h3{margin:2px 0 4px}.fin .card p{margin:0;color:var(--mut);font-size:.92rem}