@font-face{font-family:"Lexend";src:url("lexend-latin.woff2") format("woff2");font-weight:100 900;font-style:normal;font-display:swap}
:root{--bg:#FBF7F0;--ink:#1F2A44;--mute:#5B6785;--card:#fff;--line:#E4DCCD;--green:#2F9E6B;--green-soft:#D5EFE2;--green-dark:#1f7a50;--teal:#1B8FA0}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Lexend",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:1.125rem;line-height:1.6}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:10px 14px;border-radius:0 0 10px 0;z-index:10}
.skip:focus{left:0}
.top{border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:5}
.brand{display:inline-flex;align-items:center;gap:10px;padding:14px 0;font-weight:800;font-size:1.25rem;color:var(--ink);text-decoration:none}
.logo{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--green-soft)}
h1{font-size:clamp(2rem,5vw,2.8rem);line-height:1.15;margin:32px 0 8px;font-weight:800}
h2{font-size:1.6rem;line-height:1.25;margin:40px 0 8px;font-weight:800}
h3{font-size:1.2rem;line-height:1.3;margin:0 0 6px;font-weight:700}
p{margin:0 0 14px}
.lead{font-size:1.25rem;color:var(--mute);max-width:46ch}
.note{background:var(--green-soft);border-radius:14px;padding:14px 18px;max-width:60ch}
.meta{font-weight:400;font-size:.9rem;color:var(--mute)}
a{color:var(--green-dark);text-underline-offset:3px}
a:focus-visible,summary:focus-visible,video:focus-visible{outline:4px solid var(--teal);outline-offset:3px;border-radius:6px}
.crumb{margin:20px 0 0}
.group p{color:var(--mute);margin-bottom:18px}
.grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.card{display:block;background:var(--card);border:2px solid var(--line);border-radius:22px;overflow:hidden;text-decoration:none;color:inherit;transition:border-color .15s}
.card:hover{border-color:var(--green)}
.card img{display:block;width:100%;height:auto;background:var(--green-soft)}
.card-body{padding:16px 18px 18px}
.card-body p{margin:0 0 6px;color:var(--mute);font-size:1rem}
.card-body .meta{font-size:.9rem}
video{display:block;width:100%;max-width:860px;height:auto;aspect-ratio:16/9;background:#000;border-radius:18px}
video.port{aspect-ratio:9/16;max-width:420px;margin:0 auto}
.parts{display:grid;gap:28px;grid-template-columns:repeat(auto-fill,minmax(320px,1fr))}
.part{background:var(--card);border:2px solid var(--line);border-radius:22px;padding:18px}
.part video{border-radius:14px}
.chap{margin-top:12px;max-width:860px}
.chap summary{cursor:pointer;font-weight:600}
.chap ul{list-style:none;padding:0;margin:10px 0 0;color:var(--mute)}
.help{margin:48px 0 24px;background:var(--card);border:2px solid var(--green-soft);border-radius:22px;padding:8px 22px 14px}
.help h2{margin-top:16px}
.help ul{padding-left:20px;margin:0}
.help li{margin:6px 0}
.foot{color:var(--mute);font-size:.95rem;padding-top:24px;padding-bottom:48px}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media (max-width:700px){body{font-size:1.0625rem}.wrap{padding:0 16px}.parts{grid-template-columns:1fr}}