/* The lesson pages (tools/seo_pages.py). Clean Slate, Midnight Neon in the dark; no script. */
:root{--bg:#FAFAFB;--surface:#FFFFFF;--surface-2:#F4F5F8;--border:#ECECEF;--text:#17181C;--text-2:#5C6069;--accent:#4F5DE4;--tint:#EEF0FE;--warn:#B45309;--en:'Nunito';--fa:'Vazirmatn';color-scheme:light}
@media (prefers-color-scheme:dark){:root{--bg:#0D1117;--surface:#161C24;--surface-2:#1B222C;--border:#232B36;--text:#F2F6FA;--text-2:#95A1AF;--accent:#B8F135;--tint:rgba(184,241,53,.12);--warn:#FFAA64;color-scheme:dark}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.65 var(--en),system-ui,sans-serif}
[lang=fa] body,body:lang(fa){font-family:var(--fa),var(--en),system-ui,sans-serif;line-height:1.9}
a{color:var(--accent)}
.top{display:flex;justify-content:space-between;align-items:center;gap:12px;max-width:760px;margin:0 auto;padding:16px}
.brand{display:flex;align-items:center;gap:8px;color:var(--text);text-decoration:none;font-weight:800}
.brand img{border-radius:6px}
.top nav{display:flex;gap:16px;font-weight:700}
main{max-width:760px;margin:0 auto;padding:0 16px 64px}
h1{font-size:clamp(28px,6vw,40px);line-height:1.15;margin:.2em 0 .3em;text-wrap:balance}
h2{font-size:22px;line-height:1.3;margin:0 0 .4em;text-wrap:balance}
h3{font-size:18px;margin:0 0 .4em}
p{margin:.5em 0}
.meta{color:var(--text-2);font-size:14px}
.sum{font-size:19px;color:var(--text-2)}
.lead{margin:8px 0 24px}
article>*,main>section,main>p{margin:20px 0}
.card,.compare,.steps,.points,.recap,.quiz,.callout,.dyk,.example-code,.md,.frames,.module,.cta,.outline{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:18px 20px}
.eyebrow{font-size:12px;font-weight:800;letter-spacing:.08em;color:var(--accent);margin:0 0 4px}
.example{border-inline-start:3px solid var(--accent);padding-inline-start:12px;color:var(--text-2)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.two>div{background:var(--surface-2);border-radius:12px;padding:12px 14px}
@media (max-width:560px){.two{grid-template-columns:1fr}}
.callout{background:var(--tint);border-color:transparent}
.callout.warning h3{color:var(--warn)}
.dyk{background:var(--surface-2)}
.recap{border-color:var(--accent)}
.quiz details{margin-top:10px}
.quiz summary{cursor:pointer;font-weight:800;color:var(--accent)}
.opts li,.lines li{margin:4px 0}
pre.code{background:var(--surface-2);border-radius:10px;padding:12px 14px;overflow-x:auto;direction:ltr;text-align:left;font:14px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;margin:.5em 0}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em;background:var(--surface-2);border-radius:4px;padding:0 4px;unicode-bidi:isolate}
pre code{background:none;padding:0}
.table{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{border-bottom:1px solid var(--border);padding:8px;text-align:start}
.frames ol{list-style:none;padding:0;margin:0;display:grid;gap:16px}
.frames figure{margin:0}
.frames img{width:100%;height:auto;border-radius:12px;background:#080C14;display:block}
.frames figcaption{margin-top:8px}
.video{margin:20px 0}
.video video{width:100%;height:auto;border-radius:16px;background:#0D1117;display:block}
.video figcaption{color:var(--text-2);font-size:14px;margin-top:6px}
.cta{background:var(--tint);border-color:transparent}
.stores{display:flex;flex-wrap:wrap;gap:8px}
.btn{display:inline-block;background:var(--accent);color:var(--bg);text-decoration:none;font-weight:800;border-radius:12px;padding:10px 16px}
.btn.ghost{background:transparent;color:var(--accent);border:1.5px solid var(--accent)}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.pn a{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:12px 14px;text-decoration:none;color:var(--text);font-weight:700}
.pn a span{color:var(--text-2);font-size:13px;font-weight:600}
.pn .next{text-align:end;grid-column:2}
.outline ol{padding-inline-start:22px}
[dir=rtl] ol{list-style-type:persian}
.outline li[aria-current] a{color:var(--text);font-weight:800;text-decoration:none}
.crumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:8px 0 0;font-size:14px;color:var(--text-2)}
.crumbs li+li::before{content:"›";margin-inline-end:6px}
[dir=rtl] .crumbs li+li::before{content:"‹"}
.courses{list-style:none;padding:0;display:grid;gap:10px}
.courses li{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:12px 16px}
.courses p{margin:.2em 0 0;color:var(--text-2);font-size:15px}
.module ol li{margin:10px 0}
.module ol p{margin:0;color:var(--text-2);font-size:15px}
.ipa{font-weight:400;color:var(--text-2);font-size:.8em}