:root{--paper:#f2eee4;--ink:#191713;--red:#c44520;--lime:#e8a044;--muted:#716b5f;--line:rgba(25,23,19,.18);--mono:'Space Mono',monospace;--serif:'Noto Serif SC',serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--serif);line-height:1.9}body:before{content:"";position:fixed;inset:0;pointer-events:none;z-index:10;opacity:.12;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.18'/%3E%3C/svg%3E")}
a{color:var(--red);text-underline-offset:4px}.top{position:sticky;top:0;z-index:9;background:rgba(242,238,228,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.top-inner{width:min(920px,calc(100% - 36px));height:58px;margin:auto;display:flex;align-items:center;justify-content:space-between}.brand{font:700 10px var(--mono);letter-spacing:.12em}.back{color:var(--ink);text-decoration:none;font-size:13px;font-weight:700}.back:hover{color:var(--red)}
.hero{width:min(1100px,calc(100% - 36px));min-height:520px;margin:32px auto 0;padding:72px clamp(28px,6vw,82px) 58px;display:flex;flex-direction:column;justify-content:flex-end;position:relative;isolation:isolate;overflow:hidden;border:1px solid var(--ink);background-image:linear-gradient(90deg,rgba(242,238,228,.96) 0%,rgba(242,238,228,.88) 52%,rgba(242,238,228,.5) 100%),var(--hero-image);background-size:cover;background-position:center;box-shadow:10px 10px 0 var(--lime)}.hero:after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(0deg,rgba(25,23,19,.08),transparent 45%);pointer-events:none}.tag{font:700 10px var(--mono);letter-spacing:.16em;color:var(--red);text-transform:uppercase}.hero h1{font-size:clamp(38px,6vw,72px);line-height:1.13;letter-spacing:-.045em;margin:18px 0 24px;max-width:850px}.hero p{font-size:17px;color:#514c43;margin:0;max-width:680px}.hero b{color:var(--ink)}
main{width:min(760px,calc(100% - 36px));margin:auto;padding:64px 0 110px}main>p:first-child{font-size:20px}h1{font-size:38px;line-height:1.25;margin:60px 0 22px}h2{font-size:29px;line-height:1.35;margin:54px 0 18px}h3{font-size:22px;margin:42px 0 14px}p{margin:0 0 22px}strong{font-weight:900}blockquote{margin:35px 0;padding:22px 28px;border-left:5px solid var(--red);background:#e8e0d0}blockquote p:last-child{margin-bottom:0}ul,ol{padding-left:24px;margin:0 0 28px}li{margin:10px 0}img{display:block;max-width:100%;height:auto;margin:35px auto;border:1px solid var(--line)}img[src^="data:image/svg"]{display:none}hr{border:0;border-top:1px solid var(--line);margin:55px 0}code{font-family:var(--mono);font-size:.87em;background:#e7dfcf;padding:.15em .35em}pre{white-space:pre-wrap;background:var(--ink);color:var(--paper);padding:25px;overflow:auto}
main h1:has(+ p),main h1{scroll-margin-top:80px}main h1:nth-of-type(n+1){border-top:1px solid var(--line);padding-top:42px}main h1:last-of-type{background:var(--lime);padding:28px;border:0}.end-nav{width:min(760px,calc(100% - 36px));margin:-65px auto 65px;display:flex;justify-content:space-between;gap:18px}.course-btn{display:inline-flex;background:var(--ink);color:var(--paper);padding:13px 18px;text-decoration:none;font-weight:700}.course-btn:hover{background:var(--red)}footer{border-top:1px solid var(--line);padding:25px 18px;text-align:center;font:10px var(--mono);letter-spacing:.1em;color:var(--muted)}
@media(max-width:640px){.hero{min-height:500px;margin-top:18px;padding:46px 24px 38px;background-image:linear-gradient(0deg,rgba(242,238,228,.97) 0%,rgba(242,238,228,.82) 72%,rgba(242,238,228,.42) 100%),var(--hero-image);background-position:center}.hero h1{font-size:39px}main{padding-top:42px}h1{font-size:30px}h2{font-size:25px}.end-nav{flex-direction:column}.course-btn{justify-content:center}}