:root{--ink:#1a1a1a;--muted:#525252;--line:#d8d8d8;--paper:#fefefe;--panel:#f8f8f8;font:16px/1.5 Roboto,Arial,sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0}header,footer{border-block:1px solid var(--line)}.bar,main{width:min(1060px,90%);margin:auto}.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0;color:var(--muted);font-size:.84rem}.brand{font-size:2rem;letter-spacing:-.07em;color:var(--ink);font-weight:650;text-decoration:none}.brand span{color:#567667}.intro{padding:clamp(40px,6vw,76px) 0 22px}.kicker{font-size:.78rem;letter-spacing:.07em;font-weight:600;margin:0 0 10px;color:var(--muted)}h1,h2,h3{line-height:1.08;letter-spacing:-.045em;font-weight:550;margin:0}h1{font-size:clamp(2.65rem,6vw,4.7rem)}h2{font-size:clamp(1.7rem,3.6vw,2.5rem)}h3{font-size:clamp(1.5rem,2.4vw,1.85rem)}p{color:var(--muted)}.intro>p:last-child{max-width:540px;font-size:1.12rem}nav{display:flex;gap:8px;flex-wrap:wrap;padding-bottom:28px;border-bottom:1px solid var(--line)}a{color:inherit;text-underline-offset:3px}nav a,.download{border-radius:999px;text-decoration:none;padding:9px 17px;border:1px solid var(--line)}nav a:hover,summary:hover{background:var(--panel)}section{scroll-margin-top:20px}#lesson-1{padding:36px 0}.flow,.later{display:grid;grid-template-columns:1fr 1fr;gap:26px}.flow{margin-top:22px;align-items:start;position:relative}.flow:before{content:"";position:absolute;top:48px;width:100%;height:1px;background:#aaa;z-index:-1}article{background:white;border:1px solid var(--line);border-radius:16px;padding:26px;min-width:0}.mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;margin-bottom:20px;font-size:1.4rem}.mint{background:#dfede5}.lilac{background:#ede7fa}.download{display:inline-flex;align-items:center;gap:16px;background:var(--ink);color:white;border-color:var(--ink);font-weight:550;margin:5px 0 20px}.download:hover{background:#393939}.download small{font-size:.73rem;color:#dedede}details{border-top:1px solid var(--line)}summary{padding-top:14px;cursor:pointer;font-weight:500}ol{padding-left:1.4rem}li+li{margin-top:8px}blockquote{margin:14px 0;padding:12px;background:var(--panel);border-left:2px solid #ad9bc7}code,blockquote{overflow-wrap:anywhere}details a{display:inline-block;margin:4px 0}.later{border-top:1px solid var(--line);padding:30px 0 44px}.later h2{font-size:1.4rem}.later p:last-child{font-size:.92rem}a:focus-visible,summary:focus-visible{outline:3px solid #2968e9;outline-offset:3px}@media(max-width:740px){.flow,.later{grid-template-columns:1fr;gap:16px}.flow:before{height:100%;width:1px;left:44px;top:0}article{padding:22px}.later section+section{border-top:1px solid var(--line);padding-top:18px}nav a{padding:8px 12px}}
:root{--out:cubic-bezier(.22,1,.36,1);--inout:cubic-bezier(.65,0,.35,1)}
article{box-shadow:0 3px 15px #1a1a1a05;transition:border-color .36s var(--out),box-shadow .36s var(--out)}article:hover,article:focus-within{border-color:#b8bfb9;box-shadow:0 8px 26px #23352b0c}
summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:12px;border-radius:4px}summary::-webkit-details-marker{display:none}summary:after{content:"";border:solid currentColor;border-width:0 1.5px 1.5px 0;width:7px;height:7px;flex:none;margin-right:5px;transform:rotate(45deg);transition:transform .4s var(--inout)}details[open]>summary:after{transform:rotate(225deg)}
@supports (interpolate-size:allow-keywords){details{interpolate-size:allow-keywords}details::details-content{height:0;opacity:0;overflow:clip;transition:height .4s var(--inout),opacity .24s var(--out),content-visibility .4s allow-discrete}details[open]::details-content{height:auto;opacity:1;transition:height .4s var(--inout),opacity .38s .08s var(--out),content-visibility .4s allow-discrete}}
@keyframes arrive{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
@media(prefers-reduced-motion:no-preference){.intro,.gate-card,article{animation:arrive .8s var(--out) backwards}article{animation-delay:.08s}article+article{animation-delay:.16s}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after,*::details-content{animation:none!important;transition:none!important}}
.gate{min-height:100vh;background:#f8f9f8}.gate header{background:white}.gate-main{padding:clamp(36px,9vh,100px) 0}.gate-card{max-width:490px;margin:0 auto;padding:clamp(24px,5vw,48px);background:white;border:1px solid var(--line);border-radius:16px}.gate h1{font-size:clamp(2.3rem,6vw,3.4rem)}.gate label{display:block;font-weight:550}.gate input{margin:8px 0 0;width:100%;padding:12px;border:1px solid #999;border-radius:9px;font:inherit}.gate input:focus-visible{outline:2px solid #476956;outline-offset:2px}.gate button,.logout{font:inherit;cursor:pointer}.gate button{margin:18px 0 0}.gate #message{color:#9d372e;margin:6px 0 0;font-size:.9rem}.logout{border:0;background:none;text-decoration:underline;text-underline-offset:3px;color:var(--muted)}.account{display:flex;align-items:center;gap:16px}