:root{
  --ink:#0B1020; --ink2:#10172e; --cobalt:#172A46; --mist:#E8EEF5; --dim:#93A3C0; --faint:#8191b0;
  --line:rgba(232,238,245,.12); --glass:rgba(18,27,52,.55); --glass2:rgba(26,38,70,.7);
  --c:#5CE1E6; --amber:#FFB86B;
  --display:'Noto Kufi Arabic','IBM Plex Sans Arabic',sans-serif; --body:'IBM Plex Sans Arabic',system-ui,sans-serif; --mono:'JetBrains Mono',ui-monospace,monospace;
  --r:18px; --ease:cubic-bezier(.2,.8,.2,1);
}
*{box-sizing:border-box;margin:0}
[hidden]{display:none!important}
html{color-scheme:dark;scroll-behavior:smooth}
body{background:var(--ink);color:var(--mist);font:400 16px/1.7 var(--body);min-height:100vh;overflow-x:hidden;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:-2;background:
  radial-gradient(900px 600px at 85% -10%,rgba(92,225,230,.10),transparent 60%),
  radial-gradient(800px 600px at 10% 30%,rgba(167,139,250,.10),transparent 60%),
  radial-gradient(700px 500px at 60% 110%,rgba(255,138,61,.10),transparent 60%),var(--ink)}
#stars{position:fixed;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex:none}
:focus-visible{outline:2px solid var(--c);outline-offset:3px;border-radius:8px}
kbd{font:500 12px var(--mono);border:1px solid var(--line);border-radius:6px;padding:0 6px;color:var(--dim)}
main{outline:0}
.skip{position:absolute;inset-inline-start:12px;top:-60px;z-index:100;background:var(--c);color:#06101a;padding:8px 16px;border-radius:10px;font-weight:700}.skip:focus{top:12px}

/* ---------- header ---------- */
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px max(20px,4vw);backdrop-filter:blur(14px);background:linear-gradient(var(--ink),rgba(11,16,32,.55));border-bottom:1px solid transparent}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);font-size:20px}
.brand i{width:26px;height:26px;border-radius:50%;border:1.6px solid var(--c);position:relative;box-shadow:0 0 14px -2px var(--c)}
.brand i::after{content:"";position:absolute;width:8px;height:8px;border-radius:50%;background:var(--amber);top:-3px;inset-inline-end:-3px;box-shadow:0 0 10px var(--amber)}
.brand b{font-weight:800}.brand span{font-weight:500;color:var(--dim)}
.top nav{display:flex;gap:10px}
.chip{display:inline-flex;align-items:center;gap:9px;padding:8px 14px;border:1px solid var(--line);border-radius:999px;background:var(--glass);color:var(--dim);font-size:14px;transition:.25s var(--ease)}
.chip:hover{color:var(--mist);border-color:rgba(232,238,245,.3);transform:translateY(-1px)}

/* ---------- home ---------- */
.home{position:relative;padding:clamp(12px,3vh,36px) max(20px,4vw) 220px;min-height:calc(100vh - 60px)}
.hero{max-width:640px}
.hero h1{font:800 clamp(34px,4.4vw,68px)/1.15 var(--display);letter-spacing:-.01em}@media(min-width:700px){.hero h1{white-space:nowrap}}
.hero h1 em{font-style:normal;background:linear-gradient(100deg,#5CE1E6,#A78BFA 70%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .en{margin-top:14px;font:500 13px var(--mono);letter-spacing:.38em;color:var(--dim);text-transform:uppercase}
.hero p{margin-top:18px;color:var(--dim);max-width:34ch;border-inline-start:2px solid var(--amber);padding-inline-start:14px}
.orbit{display:flex;gap:clamp(8px,2vw,32px);justify-content:center;margin-top:-2vh;perspective:1200px}
.world{--c:#5CE1E6;flex:1 1 0;max-width:340px;min-width:0;display:flex;flex-direction:column;align-items:center;text-align:center;position:relative;transition:transform .5s var(--ease)}
.world:nth-child(1){margin-top:6vh}.world:nth-child(2){margin-top:-1vh}.world:nth-child(3){margin-top:4vh}.world:nth-child(4){margin-top:10vh}.world:nth-child(n+5){margin-top:2vh}
.world:hover{transform:translateY(-8px)}
.orb{position:relative;width:100%;aspect-ratio:1}
.orb canvas{position:absolute;inset:-6%;width:112%;height:112%;pointer-events:none}
.orb .lens{position:absolute;inset:27%;border-radius:50%;overflow:hidden;box-shadow:0 0 40px -6px var(--c),inset 0 0 0 1px color-mix(in srgb,var(--c) 60%,transparent)}
.orb .lens img{width:100%;height:100%;object-fit:cover;opacity:.85}
.orb .ring{position:absolute;inset:-4%;transform:perspective(900px) rotateX(72deg) rotateZ(-12deg);pointer-events:none}
.orb .ring::before{content:"";position:absolute;inset:0;border-radius:50%;border:1px solid color-mix(in srgb,var(--c) 45%,transparent)}
.orb .ring .spin{position:absolute;inset:0;animation:spin 26s linear infinite}
.orb .ring .spin.b{animation-duration:38s;animation-direction:reverse;inset:6%}
.sat{position:absolute;width:9px;height:9px;margin:-4.5px;border-radius:50%;background:var(--c);box-shadow:0 0 10px var(--c)}
.sat.todo{background:var(--ink);border:1.5px solid var(--c);box-shadow:none}
@keyframes spin{to{transform:rotate(360deg)}}
.pill{display:flex;align-items:center;gap:10px;border:1px solid var(--line);background:rgba(18,27,52,.78);border-radius:14px;padding:10px 14px;margin-top:10px}
.world .name{font:700 clamp(15px,1.5vw,19px)/1.35 var(--display);border-color:color-mix(in srgb,var(--c) 40%,var(--line));box-shadow:0 8px 30px -14px var(--c);transition:.3s var(--ease)}
.world:hover .name{background:color-mix(in srgb,var(--c) 14%,var(--glass2));box-shadow:0 10px 40px -10px var(--c)}
.world .name svg{color:var(--c);transition:transform .3s var(--ease)}.world:hover .name svg{transform:translateX(-4px)}
.stat{font-size:13px;color:var(--dim);padding:6px 12px;border-radius:999px}
.ring-p{--p:0;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--c) calc(var(--p)*1%),rgba(255,255,255,.1) 0);position:relative;font:500 10px var(--mono);color:var(--mist)}
.ring-p::before{content:"";position:absolute;inset:3px;border-radius:50%;background:var(--ink2)}.ring-p span{position:relative}
.horizon{position:fixed;inset:auto 0 0;height:34vh;z-index:-1;pointer-events:none;overflow:hidden;mask:linear-gradient(transparent,#000 60%)}
.horizon::before{content:"";position:absolute;inset:-64px 0 0;will-change:transform;transform-origin:50% 100%;transform:perspective(500px) rotateX(62deg) scale(2.4);background:
  repeating-linear-gradient(90deg,rgba(92,225,230,.16) 0 1px,transparent 1px 64px),repeating-linear-gradient(0deg,rgba(92,225,230,.16) 0 1px,transparent 1px 64px);animation:floor 6s linear infinite}
@keyframes floor{to{transform:perspective(500px) rotateX(62deg) scale(2.4) translateY(64px)}}
.resume{position:fixed;inset-inline:0;bottom:22px;margin-inline:auto;width:min(760px,calc(100vw - 32px));z-index:10;display:flex;gap:16px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:22px;background:var(--glass2);backdrop-filter:blur(18px);box-shadow:0 20px 60px -20px #000;transition:.3s var(--ease)}
.resume:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--c) 60%,transparent)}
.resume .th{position:relative;flex:none;width:clamp(96px,20vw,168px);aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#000}
.resume .th img{width:100%;height:100%;object-fit:cover}
.resume .th b{position:absolute;inset-inline-start:6px;bottom:6px;font:500 11px var(--mono);background:rgba(0,0,0,.65);padding:1px 7px;border-radius:6px}
.resume .tx{flex:1;min-width:0}.resume small{color:var(--c);font:600 12px var(--display)}
.resume h3{font:600 15px/1.4 var(--body);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.resume .bar{height:4px;background:rgba(255,255,255,.12);border-radius:4px;margin-top:8px;overflow:hidden}.resume .bar i{display:block;height:100%;background:var(--c);box-shadow:0 0 10px var(--c)}
.resume .go{flex:none;width:44px;height:44px;border-radius:50%;display:grid;place-items:center;border:1px solid var(--line);background:rgba(255,255,255,.05)}
.empty{margin:60px auto;max-width:420px;text-align:center;color:var(--dim);border:1px dashed var(--line);border-radius:var(--r);padding:32px}

/* ---------- course page ---------- */
.course{--c:#5CE1E6;padding:clamp(16px,4vh,40px) max(20px,4vw) 120px;max-width:1200px;margin-inline:auto}
.back{display:inline-flex;gap:8px;align-items:center;color:var(--dim);font-size:14px;margin-bottom:18px}.back:hover{color:var(--mist)}
.chero{display:grid;grid-template-columns:1fr minmax(180px,340px);gap:24px;align-items:center;position:relative}
.chero .tag{font:500 12px var(--mono);letter-spacing:.3em;color:var(--c);text-transform:uppercase}
.chero h1{font:800 clamp(30px,4.6vw,60px)/1.18 var(--display);margin:10px 0 14px;text-shadow:0 0 40px color-mix(in srgb,var(--c) 40%,transparent)}
.chero p{color:var(--dim);max-width:52ch}
.chero .meta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px;align-items:center}
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 22px;border-radius:999px;font:700 15px var(--display);background:var(--c);color:#06101a;box-shadow:0 10px 40px -10px var(--c);transition:.25s var(--ease)}
.btn:hover{transform:translateY(-2px);filter:brightness(1.1)}
.btn.ghost{background:var(--glass);color:var(--mist);border:1px solid var(--line);box-shadow:none;font-weight:500}
.chero .orb{width:100%}
.path{position:relative;margin-top:48px;padding-inline-start:44px}
.path::before{content:"";position:absolute;inset-block:12px;inset-inline-start:15px;width:2px;background:linear-gradient(var(--c),transparent);opacity:.5}
.lec{position:relative;display:grid;grid-template-columns:clamp(120px,22vw,220px) 1fr;gap:16px;padding:12px;margin-bottom:14px;border:1px solid var(--line);border-radius:var(--r);background:var(--glass);transition:.3s var(--ease)}
.lec:hover{border-color:color-mix(in srgb,var(--c) 55%,transparent);transform:translateX(-4px);background:var(--glass2)}
.lec .node{position:absolute;inset-inline-start:-37px;top:26px;width:16px;height:16px;border-radius:50%;border:2px solid var(--c);background:var(--ink);box-shadow:0 0 12px -2px var(--c)}
.lec.done .node{background:var(--c)}.lec.next .node{animation:pulse 1.8s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--c) 70%,transparent)}100%{box-shadow:0 0 0 14px transparent}}
.lec .th{position:relative;aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#000}.lec .th img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}.lec:hover .th img{transform:scale(1.05)}
.lec .th .bar{position:absolute;inset:auto 0 0;height:3px;background:rgba(255,255,255,.2)}.lec .th .bar i{display:block;height:100%;background:var(--c)}
.lec h3{font:600 17px/1.5 var(--body)}.lec p{color:var(--dim);font-size:14px;margin-top:2px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.lec .k{display:flex;gap:10px;margin-top:8px;font:500 12px var(--mono);color:var(--faint);flex-wrap:wrap}
.lec .k .ok{color:var(--c)}

/* ---------- lecture page ---------- */
.watch{--c:#5CE1E6;display:grid;grid-template-columns:minmax(260px,340px) minmax(0,1fr);gap:24px;padding:12px max(16px,3vw) 80px;max-width:1700px;margin-inline:auto;transition:.4s var(--ease)}
.watch .stagecol{min-width:0}
.crumbs{display:flex;gap:10px;align-items:center;color:var(--dim);font-size:14px;margin-bottom:12px;flex-wrap:wrap}
.crumbs .sp{flex:1}
.crumbs button.chip{padding:6px 12px;font-size:13px}.crumbs .chip[aria-pressed=true]{color:var(--c);border-color:var(--c)}
.stage{position:relative;border-radius:20px;padding:6px;background:linear-gradient(135deg,color-mix(in srgb,var(--c) 70%,transparent),rgba(255,255,255,.04) 40%,color-mix(in srgb,var(--c) 40%,transparent));box-shadow:0 0 80px -20px var(--c)}
.screen{position:relative;aspect-ratio:16/9;border-radius:15px;overflow:hidden;background:#000}
.screen iframe,.screen #yt{position:absolute;inset:0;width:100%;height:100%;border:0}
.poster{position:absolute;inset:0;z-index:1;background:#000 center/cover}
.shield{position:absolute;inset:0;cursor:pointer;z-index:2;display:grid;place-items:center}
.shield .big{width:84px;height:84px;border-radius:50%;display:grid;place-items:center;background:rgba(10,15,30,.55);backdrop-filter:blur(8px);border:1px solid color-mix(in srgb,var(--c) 70%,transparent);box-shadow:0 0 50px -6px var(--c);opacity:0;transform:scale(.8);transition:.3s var(--ease)}
.paused .shield .big{opacity:1;transform:none}.shield .big svg{width:34px;height:34px;fill:var(--c);stroke:none}
.screen .up{position:absolute;z-index:4;inset:0;display:none;place-items:center;text-align:center;background:rgba(7,11,24,.86);backdrop-filter:blur(8px)}.screen .up.on{display:grid}
.up h4{font:700 22px var(--display);margin:6px 0 14px}.up small{color:var(--dim)}.up .row{display:flex;gap:10px;justify-content:center}
.pwrap:fullscreen,.pwrap.fs{background:var(--ink);display:flex;flex-direction:column;justify-content:center;padding:2vw;overflow:auto}
.pwrap.fs{position:fixed;inset:0;z-index:70}
.deck{margin-top:12px;padding:12px 16px;border:1px solid var(--line);border-radius:16px;background:var(--glass);backdrop-filter:blur(10px)}
.track{position:relative;height:30px;cursor:pointer;touch-action:none;margin:0 6px}
.track .rail{position:absolute;inset-inline:0;top:13px;height:4px;border-radius:4px;background:rgba(255,255,255,.14)}
.track .buf{position:absolute;top:13px;height:4px;border-radius:4px;background:rgba(255,255,255,.14);inset-inline-start:0}
.track .fill{position:absolute;top:13px;height:4px;border-radius:4px;background:var(--c);box-shadow:0 0 12px var(--c);inset-inline-start:0}
.track .knob{position:absolute;top:8px;width:14px;height:14px;margin-inline-start:-7px;border-radius:50%;background:#fff;box-shadow:0 0 14px var(--c);transition:transform .15s}.track:hover .knob{transform:scale(1.3)}
.track .ch{position:absolute;top:9px;width:12px;height:12px;margin-inline-start:-6px;border-radius:50%;background:var(--ink);border:2px solid var(--c);z-index:1;transition:transform .2s}
.track .ch:hover{transform:scale(1.4);background:var(--c)}
.track .nt{position:absolute;top:1px;width:8px;height:8px;margin-inline-start:-4px;background:var(--amber);transform:rotate(45deg);box-shadow:0 0 8px var(--amber)}
.track .tip{position:absolute;bottom:30px;transform:translateX(50%);background:var(--ink2);border:1px solid var(--line);border-radius:8px;padding:2px 10px;font:500 12px var(--mono);white-space:nowrap;pointer-events:none;opacity:0;z-index:3}
.track:hover .tip{opacity:1}
.ctl{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.ctl .ib{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;color:var(--mist);transition:.2s}.ctl .ib:hover{background:rgba(255,255,255,.08);color:var(--c)}
.ctl .ib svg{width:20px;height:20px}
.ctl .tm{font:500 13px var(--mono);color:var(--dim);direction:ltr;padding-inline:6px}
.ctl .now{flex:1;min-width:120px;font-size:14px;color:var(--c);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ctl .spd{font:600 13px var(--mono);padding:4px 10px;border-radius:10px;border:1px solid var(--line)}
.ctl .spd:hover{border-color:var(--c);color:var(--c)}
.info{margin-top:22px}.info h1{font:700 clamp(22px,2.6vw,32px)/1.4 var(--display)}.info .d{color:var(--dim);margin-top:6px;white-space:pre-line;max-width:80ch}
.tabs{display:flex;gap:4px;margin:24px 0 14px;border-bottom:1px solid var(--line)}
.tabs button{padding:10px 18px;color:var(--dim);border-bottom:2px solid transparent;margin-bottom:-1px;font-weight:500}
.tabs button[aria-selected=true]{color:var(--c);border-color:var(--c)}
.panel{min-height:140px}
.note-in{display:flex;gap:10px;align-items:flex-start;flex-wrap:wrap}
textarea,input[type=text],input[type=url],input[type=password],select{width:100%;background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:12px;padding:10px 14px;color:var(--mist);font:inherit}
textarea:focus,input:focus,select:focus{outline:0;border-color:var(--c)}
.note-in textarea{flex:1;min-width:220px;min-height:76px;resize:vertical}
.items{display:grid;gap:8px;margin-top:14px}
.item{display:flex;gap:12px;align-items:flex-start;padding:10px 14px;border:1px solid var(--line);border-radius:12px;background:var(--glass);cursor:pointer;transition:.2s}
.item:hover{border-color:color-mix(in srgb,var(--c) 50%,transparent)}
.item time{font:500 13px var(--mono);color:var(--c);direction:ltr;flex:none;padding-top:2px;min-width:52px}
.item span{flex:1;white-space:pre-wrap;word-break:break-word}
.item .x{color:var(--faint);padding:0 6px}.item .x:hover{color:#ff7a8a}
.item.cur{border-color:var(--c);background:color-mix(in srgb,var(--c) 10%,var(--glass))}
.side{position:sticky;top:76px;align-self:start;max-height:calc(100vh - 92px);overflow:auto;padding:18px 16px 18px 12px;border:1px solid var(--line);border-radius:20px;background:var(--glass);backdrop-filter:blur(12px);scrollbar-width:thin}
.side h2{font:700 15px var(--display);margin-bottom:4px}.side .sub{font-size:13px;color:var(--dim);margin-bottom:16px}
.cons{position:relative;display:grid;gap:4px;padding-inline-start:30px}
.cons::before{content:"";position:absolute;inset-block:14px;inset-inline-start:9px;width:1.5px;background:linear-gradient(var(--c),rgba(255,255,255,.1));opacity:.6}
.cons a{position:relative;display:block;padding:10px 12px;border-radius:12px;font-size:14px;line-height:1.5;color:var(--dim);transition:.2s}
.cons a:hover{background:rgba(255,255,255,.05);color:var(--mist)}
.cons a::before{content:"";position:absolute;inset-inline-start:-26px;top:16px;width:11px;height:11px;border-radius:50%;border:1.5px solid var(--c);background:var(--ink)}
.cons a.done::before{background:var(--c)}
.cons a.cur{color:var(--mist);background:color-mix(in srgb,var(--c) 12%,transparent);border:1px solid color-mix(in srgb,var(--c) 40%,transparent)}
.cons a.cur::before{background:var(--c);animation:pulse 1.8s infinite}
.cons a small{display:block;font:500 11px var(--mono);color:var(--faint)}
body.focus .side,body.focus .top{display:none}body.focus .watch{grid-template-columns:1fr;max-width:1300px}
body.focus .stage{box-shadow:0 0 160px -10px var(--c)}
.res a{display:flex;gap:10px;align-items:center;padding:10px 14px;border:1px solid var(--line);border-radius:12px;background:var(--glass);margin-bottom:8px}.res a:hover{border-color:var(--c);color:var(--c)}

/* ---------- overlays ---------- */
#overlay{position:fixed;inset:0;z-index:50;display:grid;place-items:start center;padding:10vh 16px 16px;background:rgba(5,8,18,.72);backdrop-filter:blur(8px)}
.modal{width:min(680px,100%);max-height:78vh;display:flex;flex-direction:column;border:1px solid var(--line);border-radius:22px;background:var(--ink2);box-shadow:0 30px 100px -20px #000;overflow:hidden;animation:pop .25s var(--ease)}
@keyframes pop{from{opacity:0;transform:translateY(12px) scale(.98)}}
.modal header{display:flex;gap:10px;align-items:center;padding:14px 18px;border-bottom:1px solid var(--line)}
.modal header input{background:none;border:0;padding:6px;font-size:17px}.modal header h2{font:700 18px var(--display);flex:1}
.modal .body{overflow:auto;padding:10px}
.hit{display:flex;gap:12px;align-items:center;padding:10px 12px;border-radius:12px;--c:#5CE1E6}
.hit:hover,.hit.sel{background:rgba(255,255,255,.06)}
.hit i{width:10px;height:10px;border-radius:50%;background:var(--c);box-shadow:0 0 10px var(--c);flex:none}
.hit small{color:var(--faint);font-size:12px;display:block}.hit time{margin-inline-start:auto;font:500 12px var(--mono);color:var(--c);direction:ltr}
.grp{font:600 12px var(--display);color:var(--faint);padding:10px 12px 4px}
#toast{position:fixed;bottom:24px;inset-inline:0;margin-inline:auto;width:max-content;max-width:90vw;z-index:60;padding:10px 20px;border-radius:999px;background:var(--ink2);border:1px solid var(--c);color:var(--mist);font-size:14px;opacity:0;transform:translateY(20px);transition:.3s var(--ease);pointer-events:none}
#toast.on{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1000px){
  .orbit{flex-wrap:wrap}.world{flex:1 1 40%;max-width:none;margin-top:0!important}
  .watch{grid-template-columns:1fr}.side{position:static;max-height:none;order:2}
  .chero{grid-template-columns:1fr}.chero .orb{max-width:260px;margin-inline:auto;order:-1}
}
@media (max-width:600px){
  .chip span,.chip kbd{display:none}.hero{margin-top:0}
  .world{flex-basis:44%}.world .name{padding:8px 10px}
  .lec{grid-template-columns:1fr}.path{padding-inline-start:30px}.lec .node{inset-inline-start:-29px}
  .resume{bottom:12px}.resume .go{display:none}.home{padding-bottom:160px}
  .shield .big{width:64px;height:64px}.hero .en{letter-spacing:.2em;font-size:11px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}