/* «أبو ميان» — ink ground, one orange accent system, the «م» mark; shared by the home page and every lesson */
:root{
  --ink:#0A0A0A; --ink2:#141413; --line:#2C2C2A; --paper:#F2EFE8; --dot:#E4572E; --dotdeep:#3A1206; --grey:#8A8780; --soft:#CFCBC2;
  --display:'Noto Kufi Arabic','IBM Plex Sans Arabic',Tahoma,sans-serif;
  --text:'IBM Plex Sans Arabic',Tahoma,sans-serif;
  --latin:'Inter','Helvetica Neue',Arial,sans-serif;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ink);color:#fff;font-family:var(--text);font-size:17px;line-height:1.8;-webkit-font-smoothing:antialiased}
a{color:inherit}
:focus-visible{outline:2px solid var(--dot);outline-offset:3px}
.wrap{max-width:1080px;margin:0 auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
.narrow{max-width:720px}
h1,h2,h3{font-family:var(--display);font-weight:800;line-height:1.25;margin:0;text-wrap:balance}
u{text-decoration:underline;text-decoration-color:var(--dot);text-decoration-thickness:.11em;text-underline-offset:.2em;text-decoration-skip-ink:none}
.eyebrow{display:flex;gap:10px;align-items:center;font-size:14px;font-weight:700;color:var(--grey)}
.eyebrow i{width:9px;height:9px;background:var(--dot);display:inline-block;flex:none}
.tag{display:inline-block;background:var(--dot);color:var(--dotdeep);font-weight:700;font-size:13px;border-radius:99px;padding:2px 12px}
.tag.ai{background:var(--paper);color:var(--ink)}
.btn{display:inline-flex;align-items:center;gap:10px;min-height:48px;padding:0 22px;border-radius:12px;font-weight:700;text-decoration:none;font-size:16px;border:1px solid transparent;transition:background .15s,border-color .15s}
.btn-dot{background:var(--dot);color:var(--ink)}.btn-dot:hover{background:#F06A42}
.btn-line{border-color:var(--line)}.btn-line:hover{background:var(--ink2);border-color:var(--grey)}
.muted{color:var(--grey)}

/* top bar */
.top{position:sticky;top:0;z-index:5;background:rgba(10,10,10,.88);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-family:var(--display);font-weight:800;font-size:17px;white-space:nowrap}
.brand svg{width:32px;height:32px;flex:none}
.nav{display:flex;gap:22px;font-size:15px;color:var(--soft)}
.nav a{text-decoration:none}.nav a:hover,.nav a[aria-current]{color:#fff}

/* home */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero .wrap{position:relative;padding-top:88px;padding-bottom:96px}
.hero-mark{position:absolute;inset-inline-end:-4%;top:50%;transform:translateY(-50%);width:min(56vw,620px);pointer-events:none}
.hero h1{font-size:clamp(44px,8vw,96px);font-weight:900;line-height:1.1;margin-top:20px;max-width:12ch}
.hero p{font-size:clamp(18px,2.2vw,22px);color:var(--soft);max-width:44ch;margin:22px 0 0}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
@media (max-width:760px){.hero .wrap{padding-top:56px;padding-bottom:64px}.hero-mark{width:110vw;inset-inline-end:-45%;opacity:.35}}
section{padding-block:88px;border-bottom:1px solid var(--line)}
@media (max-width:760px){section{padding-block:60px}}
.sec-head{display:grid;gap:12px;margin-bottom:36px}
.sec-head h2{font-size:clamp(30px,4.6vw,50px)}
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
@media (max-width:860px){.cards{grid-template-columns:minmax(0,1fr)}}
.card{background:var(--ink2);border:1px solid var(--line);border-radius:16px;padding:22px;display:grid;gap:12px;align-content:start;text-decoration:none;transition:border-color .15s,transform .15s}
a.card:hover{border-color:var(--dot);transform:translateY(-2px)}
.card h3{font-size:21px}
.card p{margin:0;color:var(--soft);font-size:15px}
.card .meta{font-size:13px;color:var(--grey)}
.num{font-family:var(--latin);font-weight:900;font-size:44px;line-height:1;color:var(--dot)}
.series{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
@media (max-width:760px){.series{grid-template-columns:minmax(0,1fr)}}
.series ol{margin:0;padding-inline-start:22px;color:var(--soft);display:grid;gap:4px;font-size:15px}
.series li::marker{color:var(--dot);font-family:var(--latin);font-weight:700}
.series .soon{color:var(--grey)}
.series a{text-decoration-color:var(--dot)}
.socials{display:flex;flex-wrap:wrap;gap:10px}
.social{display:inline-flex;align-items:center;gap:10px;min-height:48px;padding:0 18px;border:1px solid var(--line);border-radius:12px;font-weight:700}
.social small{font-weight:400;color:var(--grey)}
.about{display:grid;grid-template-columns:auto minmax(0,1fr);gap:28px;align-items:center}
.about svg{width:120px;height:120px}
@media (max-width:620px){.about{grid-template-columns:minmax(0,1fr)}.about svg{width:84px;height:84px}}
.about p{margin:0;color:var(--soft);max-width:58ch}

/* lesson */
.crumbs{font-size:14px;color:var(--grey);padding-top:36px}
.crumbs a{text-decoration:none}.crumbs a:hover{color:#fff}
.lesson-head{padding-block:28px 40px;border-bottom:1px solid var(--line)}
.lesson-head h1{font-size:clamp(34px,6vw,60px);font-weight:900;margin-top:16px}
.lesson-head .lead{font-size:20px;color:var(--soft);margin:18px 0 0}
.lesson-head .meta{display:flex;gap:16px;flex-wrap:wrap;margin-top:18px;font-size:14px;color:var(--grey)}
article{padding-block:40px 24px}
article h2{font-size:28px;margin:44px 0 12px}
article p{margin:0 0 16px;color:#E6E3DC}
article ul,article ol{margin:0 0 18px;padding-inline-start:22px;color:#E6E3DC;display:grid;gap:6px}
article li::marker{color:var(--dot)}
.formula{background:var(--ink2);border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin:22px 0;display:grid;gap:6px}
.formula b{font-family:var(--latin);font-size:22px;direction:ltr;text-align:right;color:#fff}
.formula span{color:var(--grey);font-size:14px}
.callout{border-inline-start:4px solid var(--dot);background:var(--ink2);padding:16px 20px;margin:22px 0;border-radius:0 12px 12px 0}
.callout p{margin:0}
.big{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin:26px 0}
.big b{font-family:var(--latin);font-weight:900;font-size:clamp(56px,10vw,96px);line-height:1;color:var(--dot)}
.big span{color:var(--soft);font-size:17px}
table{width:100%;border-collapse:collapse;margin:20px 0 24px;font-size:15px}
th,td{text-align:start;padding:12px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--grey);font-weight:500;font-size:13px}
td b{color:#fff}
.prompt{background:var(--paper);color:var(--ink);border-radius:14px;padding:20px 22px;margin:22px 0;font-size:16px;line-height:1.9;white-space:pre-wrap}
.sum{background:var(--ink2);border:1px solid var(--line);border-radius:16px;padding:24px;margin-top:36px}
.sum h2{margin-top:0;font-size:22px}
.sum ol{margin-bottom:0}
.next{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-block:28px 64px}

footer{padding-block:28px;color:var(--grey);font-size:14px}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
@media (max-width:620px){.nav{gap:14px;font-size:14px}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}a.card:hover{transform:none}}