:root{
  --bg:#0b1020; --bg2:#0f1630; --card:#141c38; --card2:#1a2447; --line:#25305a;
  --text:#e9edf8; --muted:#97a1c2; --accent:#22d3ee; --accent2:#f59e0b; --ok:#34d399; --bad:#f87171;
  --ece:#f59e0b; --cse:#22d3ee; --ai:#a78bfa; --rob:#34d399; --vlsi:#f472b6; --rpro:#10b981;
  --r:16px; --gut:16px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--text);font:15px/1.55 Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;min-height:100vh;
     padding-bottom:calc(76px + env(safe-area-inset-bottom))}
a{color:inherit;text-decoration:none}
img,video{max-width:100%;display:block}
h1,h2,h3,.logo{font-family:'Space Grotesk',Inter,sans-serif;letter-spacing:-.01em}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* header + navigation: top bar on desktop, bottom tab bar on phones */
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:16px;
     padding:12px var(--gut);padding-top:calc(12px + env(safe-area-inset-top));background:var(--bg);border-bottom:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700}
.logo b{color:var(--accent);font-weight:700}
.mark{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),#6366f1);color:#05101f;font-weight:800}
.tabs{position:fixed;left:0;right:0;bottom:0;display:flex;justify-content:space-around;background:rgba(15,22,48,.97);backdrop-filter:blur(12px);
      border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom))}
.tabs a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 2px;border-radius:12px;color:var(--muted);font-size:11px;font-weight:600}
.tabs a i{font-style:normal;font-size:20px;line-height:1}
.tabs a.on{color:var(--text);background:var(--card)}
.tabs a.cta.on{background:var(--accent);color:#05101f}
@media (min-width:860px){
  body{padding-bottom:0}
  .top{background:rgba(11,16,32,.88);backdrop-filter:blur(12px)}   /* blur only on desktop: on phones it would trap the fixed tab bar */
  .tabs{position:static;background:none;border:0;padding:0;gap:4px;justify-content:flex-end}
  .tabs a{flex:none;flex-direction:row;gap:8px;padding:9px 14px;font-size:14px}
  .tabs a i{font-size:16px}
  .tabs a.cta{background:var(--accent);color:#05101f;margin-left:6px}
}

main{max-width:1180px;margin:0 auto;padding:20px var(--gut) 40px;outline:none}
.foot{max-width:1180px;margin:0 auto;padding:24px var(--gut) 32px;color:var(--muted);font-size:13px;display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between;border-top:1px solid var(--line)}
.foot a{color:var(--accent)}

/* hero */
.hero{border-radius:24px;padding:36px 22px;background:radial-gradient(120% 120% at 100% 0%,rgba(34,211,238,.22),transparent 55%),
      radial-gradient(90% 90% at 0% 100%,rgba(245,158,11,.16),transparent 60%),var(--bg2);border:1px solid var(--line);margin-bottom:26px}
.hero h1{font-size:clamp(28px,6vw,48px);line-height:1.08;margin-bottom:12px}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{color:var(--muted);max-width:640px;font-size:16px}
.stats{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0}
.stat{background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:12px;padding:10px 14px}
.stat b{display:block;font-family:'Space Grotesk';font-size:22px}
.stat span{color:var(--muted);font-size:12px}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 18px;border-radius:12px;border:1px solid var(--line);
     background:var(--card);font-weight:600;cursor:pointer;min-height:44px}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);color:#05101f;border-color:var(--accent)}
.btn.warm{background:var(--accent2);color:#1b1300;border-color:var(--accent2)}
.btn.small{padding:8px 12px;min-height:36px;font-size:13px}

.search{width:100%;padding:13px 16px 13px 44px;border-radius:14px;border:1px solid var(--line);background:var(--card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' fill='none' stroke='%2397a1c2' stroke-width='2'%3E%3Ccircle cx='8' cy='8' r='6'/%3E%3Cpath d='m13 13 4 4'/%3E%3C/svg%3E") no-repeat 15px 50%}
.search::placeholder{color:var(--muted)}

h2.sec{font-size:22px;margin:30px 0 14px;display:flex;align-items:baseline;justify-content:space-between;gap:10px}
h2.sec a{font-size:14px;color:var(--accent);font-family:Inter}

/* category cards */
.cats{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}
.cat{border-radius:var(--r);padding:20px;background:var(--card);border:1px solid var(--line);transition:transform .15s,border-color .15s}
.cat:hover{transform:translateY(-2px);border-color:var(--c)}
.cat .ic{font-size:30px}
.cat h3{margin:8px 0 4px;font-size:19px}
.cat p{color:var(--muted);font-size:14px}
.cat .n{color:var(--c);font-weight:700;font-size:13px;margin-top:10px}

/* project grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.card{border-radius:var(--r);overflow:hidden;background:var(--card);border:1px solid var(--line);display:flex;flex-direction:column;transition:transform .15s,border-color .15s}
.card:hover{transform:translateY(-3px);border-color:var(--accent)}
.card .th{aspect-ratio:16/9;background:var(--card2);position:relative}
.card .th img{width:100%;height:100%;object-fit:cover}
.badge{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.04em;padding:3px 8px;border-radius:999px;background:rgba(0,0,0,.55);color:#fff}
.card .th .badge{position:absolute;left:10px;top:10px}
.b-ECE{background:var(--ece);color:#1b1300} .b-CSE{background:var(--cse);color:#05101f} .b-AI{background:var(--ai);color:#120a2a}
.card .bd{padding:14px 14px 16px;display:flex;flex-direction:column;gap:6px;flex:1}
.card h3{font-size:16px;line-height:1.3}
.card .sub{color:var(--muted);font-size:13px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card .meta{margin-top:auto;padding-top:6px;display:flex;gap:8px;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.chip{border:1px solid var(--line);border-radius:999px;padding:3px 9px;font-size:12px;color:var(--muted);background:transparent;cursor:pointer}
.chip.on{background:var(--accent);border-color:var(--accent);color:#05101f;font-weight:600}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0 18px}
.empty{color:var(--muted);text-align:center;padding:40px 10px}

/* project page */
.back{color:var(--muted);font-size:14px;display:inline-block;margin-bottom:12px}
.detail{display:grid;gap:22px}
.detail>*{min-width:0}
@media (min-width:980px){.detail{grid-template-columns:minmax(0,1.6fr) minmax(0,1fr)}}
.player{border-radius:var(--r);overflow:hidden;background:#000;aspect-ratio:16/9}
.player video{width:100%;height:100%}
.detail h1{font-size:clamp(22px,4vw,30px);line-height:1.2;margin:14px 0 8px}
.lead{color:var(--muted);white-space:pre-line}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;margin-bottom:14px}
.panel h3{font-size:16px;margin-bottom:10px}
.ptabs{display:flex;gap:6px;overflow-x:auto;margin:18px 0 12px;scrollbar-width:none}
.ptabs button{white-space:nowrap;padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:none;color:var(--muted);cursor:pointer;font-weight:600;font-size:14px}
.ptabs button.on{background:var(--text);color:var(--bg);border-color:var(--text)}
.chap{display:flex;gap:12px;padding:9px 6px;border-bottom:1px solid var(--line);cursor:pointer;border-radius:8px}
.chap:hover{background:var(--card2)}
.chap b{color:var(--accent);font-variant-numeric:tabular-nums;min-width:48px}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:9px 6px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.04em}
td.p{white-space:nowrap;text-align:right}
.tw{overflow-x:auto}
.files{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:var(--muted);columns:2 180px}
.files div{padding:3px 0;break-inside:avoid}
.reels{display:flex;gap:10px;overflow-x:auto;padding-bottom:6px}
.reels video{width:160px;aspect-ratio:9/16;border-radius:12px;background:#000;flex:none;object-fit:cover}
.big{font-family:'Space Grotesk';font-size:28px;font-weight:700}
.note{font-size:13px;color:var(--muted)}
.stack{display:flex;flex-direction:column;gap:10px}

/* forms */
.form{display:grid;gap:14px;max-width:760px}
.two{display:grid;gap:14px}
@media (min-width:640px){.two{grid-template-columns:1fr 1fr}}
label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600}
label small{font-weight:400;color:var(--muted)}
input,select,textarea{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--card);min-height:46px}
textarea{min-height:120px;resize:vertical}
fieldset{border:1px solid var(--line);border-radius:14px;padding:14px}
legend{padding:0 6px;font-weight:600;font-size:14px}
.opts{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px}
.opt{display:flex;flex-direction:row;align-items:center;gap:10px;font-weight:500;padding:10px 12px;border:1px solid var(--line);border-radius:12px;cursor:pointer;background:var(--card)}
.opt input{width:18px;height:18px;min-height:0;accent-color:var(--accent)}
.opt:has(input:checked){border-color:var(--accent);background:rgba(34,211,238,.08)}
.msg{padding:14px 16px;border-radius:12px;font-weight:500}
.msg.ok{background:rgba(52,211,153,.12);border:1px solid var(--ok)}
.msg.err{background:rgba(248,113,113,.12);border:1px solid var(--bad)}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin:18px 0 26px}
.step{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.step b{color:var(--accent);font-family:'Space Grotesk';font-size:20px}
.ref{font-family:'Space Grotesk';font-size:30px;color:var(--accent);letter-spacing:.04em}

@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* quiz */
.pill{display:inline-block;background:#ffe14d;color:#111;font-weight:800;padding:6px 16px;border-radius:999px;font-size:13px;letter-spacing:.03em}
.quizban{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin:-8px 0 22px;padding:16px 18px;border-radius:18px;
  background:linear-gradient(90deg,rgba(245,158,11,.22),rgba(34,211,238,.14));border:1px solid rgba(245,158,11,.5)}
.quizban .qt{font-size:12px;font-weight:800;letter-spacing:.06em;color:var(--accent2)}
.quizban .qm{font-family:'Space Grotesk';font-size:24px;font-weight:700}
.quizban .qs{color:var(--muted);font-size:13px}
.qbar{display:block;margin-top:12px;padding:10px 14px;border-radius:12px;background:rgba(245,158,11,.12);border:1px solid rgba(245,158,11,.45);font-size:14px}
.qbar u{color:var(--accent2)}
@media (max-width:420px){.tabs a{font-size:10px}.tabs a i{font-size:18px}}
@media (max-width:979px){.reg{order:-1}}   /* phones: registration form right under the prize banner */

/* courses */
.b-ROB{background:var(--rob);color:#04170f} .b-VLSI{background:var(--vlsi);color:#2a0618}
.badge.soon{background:rgba(245,158,11,.16);color:var(--accent2);border:1px solid rgba(245,158,11,.5);vertical-align:middle}
.card .th .ph,.ccard .th .ph{width:100%;height:100%;display:grid;place-items:center;font-size:44px;background:linear-gradient(135deg,var(--card2),var(--bg2))}
.courses{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));gap:16px}
.ccard{border-radius:var(--r);overflow:hidden;background:var(--card);border:1px solid var(--line);display:flex;flex-direction:column;transition:transform .15s,border-color .15s}
.ccard:hover{transform:translateY(-3px);border-color:var(--c)}
.ccard .th{aspect-ratio:16/7;position:relative;background:var(--card2)}
.ccard .th img{width:100%;height:100%;object-fit:cover}
.ccard .th .badge{position:absolute;left:12px;top:12px}
.ccard .bd{padding:16px;display:flex;flex-direction:column;gap:8px;flex:1}
.ccard h3{font-size:19px;line-height:1.25}
.ccard p{color:var(--muted);font-size:14px}
.ccard .meta{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.ccard .pl{display:flex;justify-content:space-between;gap:10px;font-size:13px;color:var(--muted)}
.ccard .pl b{color:var(--c)}
.prog{height:10px;border-radius:999px;background:var(--bg2);border:1px solid var(--line);overflow:hidden}
.prog i{display:block;height:100%;min-width:0;border-radius:999px;background:linear-gradient(90deg,var(--ok),var(--accent))}
.chero{background:radial-gradient(120% 120% at 100% 0%,color-mix(in srgb,var(--c) 22%,transparent),transparent 55%),var(--bg2);margin-bottom:16px}
.chero h1{font-size:clamp(24px,5vw,40px)}
.sheet .sh{display:flex;justify-content:space-between;align-items:baseline}
.sheet .sh b{font-family:'Space Grotesk';font-size:22px;color:var(--ok)}
h2.mod{font-size:18px;margin:26px 0 10px;flex-wrap:wrap}
h2.mod small{font:500 13px Inter,sans-serif;color:var(--muted)}
.eps{list-style:none;display:grid;gap:8px}
.ep{display:flex;align-items:stretch;background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.ep.fin{border-color:rgba(52,211,153,.55)}
.ep .el{flex:1;display:flex;gap:12px;padding:10px;min-width:0}
.ep .el:hover h3{color:var(--accent)}
.ep .et{flex:none;align-self:flex-start;width:128px;aspect-ratio:16/9;border-radius:10px;overflow:hidden;background:var(--card2);display:grid;place-items:center;font-size:26px}
.ep .et img{width:100%;height:100%;object-fit:cover}
.ep.is-soon .et img{opacity:.55}
.ep .eb{min-width:0;display:flex;flex-direction:column;gap:2px}
.ep .en{font-size:12px;font-weight:700;color:var(--muted);letter-spacing:.03em}
.ep h3{font-size:15px;line-height:1.3}
.ep .sub{color:var(--muted);font-size:13px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.tick{flex:none;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:8px 14px;border-left:1px solid var(--line);font-size:11px;color:var(--muted);cursor:pointer}
.tick input{width:22px;height:22px;min-height:0;accent-color:var(--ok);cursor:pointer}
.ep.fin .tick{color:var(--ok)}
.tick:has(input:disabled){opacity:.4;cursor:default}
@media (max-width:520px){.ep .et{width:88px}.ep .el{gap:10px;padding:8px}.tick{padding:8px 10px}.ep .sub{-webkit-line-clamp:1}}
.epnav{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;margin-top:12px}
.epnav .opt.done{padding:8px 12px}
.epnav .opt.done input{accent-color:var(--ok)}
.epnav .opt.done:has(input:checked){border-color:var(--ok);background:rgba(52,211,153,.1)}
.player iframe{width:100%;height:100%;border:0;display:block}
.soonbox{position:relative;width:100%;height:100%;display:grid;place-items:center;background:var(--bg2)}
.soonbox img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.25}
.soonbox div{position:relative;text-align:center;display:grid;gap:6px;padding:16px 18px;max-width:420px;margin:12px;background:rgba(11,16,32,.82);border-radius:14px}
.soonbox b{font-family:'Space Grotesk';font-size:24px;color:var(--accent2)}
.soonbox span{color:var(--muted);font-size:14px}

/* screen-reader-only text */
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* quiz countdown */
.cdwrap{margin-top:12px}
.cd{display:flex;gap:8px;flex-wrap:wrap}
.cd[hidden],.cdlive[hidden]{display:none}
.cdu{min-width:62px;padding:8px 6px 6px;border-radius:12px;background:rgba(11,16,32,.55);border:1px solid rgba(245,158,11,.45);text-align:center}
.cdu b{display:block;font-family:'Space Grotesk';font-size:26px;line-height:1.05;font-variant-numeric:tabular-nums;color:var(--text)}
.cdu span{display:block;font-size:10px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.cdlive{display:inline-block;padding:8px 14px;border-radius:12px;background:rgba(248,113,113,.16);border:1px solid var(--bad);font-weight:700;font-size:18px}
.cdnote{margin-top:8px;font-size:12px;color:var(--muted)}
.qcd{display:flex;flex-direction:column;align-items:center;margin-top:14px}
.qcd .cd{justify-content:center}
@media (max-width:420px){.cdu{min-width:0;flex:1}.cdu b{font-size:22px}}

/* install banner (home) */
.instban{display:flex;align-items:center;gap:12px;margin:-4px 0 16px;padding:12px 12px 12px 14px;border-radius:16px;background:var(--card);border:1px solid var(--accent)}
.instban img{border-radius:10px;flex:none}
.instban p{flex:1;font-size:14px;min-width:0}
.instban .ia{display:flex;align-items:center;gap:6px;flex:none}
.instban .x{background:none;border:0;color:var(--muted);font-size:18px;width:36px;height:36px;border-radius:10px;cursor:pointer}
.instban .x:hover{background:var(--card2);color:var(--text)}
@media (max-width:520px){.instban{flex-wrap:wrap}.instban p{flex-basis:calc(100% - 60px)}.instban .ia{margin-left:auto}}

/* install guide (#/install) */
.inst-grid{display:grid;gap:16px}
@media (min-width:980px){.inst-grid{grid-template-columns:1fr 1fr}}
.inst h2{font-size:22px;margin-bottom:6px}
.inst #instnow{margin:6px 0 10px}
.isteps{list-style:none;display:grid;gap:12px;margin-top:14px}
.istep{display:grid;grid-template-columns:150px 1fr;gap:14px;align-items:center;padding:12px;border-radius:14px;background:var(--bg2);border:1px solid var(--line)}
.istep .it{display:flex;gap:10px;align-items:flex-start}
.istep .it>b{flex:none;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:#05101f;font-family:'Space Grotesk'}
.istep .it p{font-size:14px}
@media (max-width:520px){.istep{grid-template-columns:1fr}.mk-wrap{max-width:240px}}
.mock{background:#f2f2f7;color:#1c1c1e;border-radius:12px;font:500 12px/1.3 -apple-system,system-ui,Roboto,sans-serif;overflow:hidden;min-height:64px}
.mock .hl{color:#007aff;background:#dbe9ff;border-radius:8px;box-shadow:0 0 0 2px #007aff}
.mk-bar{display:flex;align-items:center;justify-content:space-around;padding:20px 4px;font-size:20px;color:#007aff}
.mk-bar span{display:grid;place-items:center;width:34px;height:34px}
.mk-menu div{padding:7px 10px;border-bottom:1px solid #d8d8de;display:flex;align-items:center;justify-content:space-between;gap:6px}
.mk-menu div:last-child{border:0;margin:3px;font-weight:700}
.mk-top{display:flex;justify-content:space-between;align-items:center;padding:8px 8px;font-size:11px;color:#007aff;gap:4px}
.mk-top b{color:#1c1c1e;font-size:11px;white-space:nowrap}
.mk-top .hl{padding:2px 8px;font-weight:700}
.mk-row{display:flex;align-items:center;gap:8px;padding:6px 10px 10px}
.mk-row small{color:#6b6b70}
.mk-ic{border-radius:8px}
.mk-home{background:linear-gradient(160deg,#3b4c8f,#1c2347);display:grid;grid-template-columns:repeat(3,1fr);gap:8px;padding:10px;place-items:center}
.mk-home i{width:30px;height:30px;border-radius:8px;background:rgba(255,255,255,.22)}
.mk-app{display:flex;flex-direction:column;align-items:center;gap:2px;color:#fff;font-size:10px;grid-row:span 1}
.mk-app img{width:40px;height:40px;border-radius:10px;box-shadow:0 0 0 2px #fff}
.mk-url{display:flex;align-items:center;gap:8px;padding:18px 8px;background:#fff}
.mk-url .u{flex:1;display:flex;align-items:center;gap:6px;background:#eef0f3;border-radius:999px;padding:7px 10px;color:#3c4043}
.mk-url .hl{display:grid;place-items:center;width:32px;height:32px;color:#1a73e8;background:#e3edfd;box-shadow:0 0 0 2px #1a73e8}
.mk-dlg{background:#fff;padding:10px}
.mk-dlg .mk-row{padding:6px 0}
.mk-btns{display:flex;justify-content:flex-end;gap:12px;color:#1a73e8;font-weight:700}
.mk-btns .hl{padding:3px 10px;color:#fff;background:#1a73e8;box-shadow:none;border-radius:999px}
.playrow{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
.soonpill{display:inline-block;padding:8px 14px;border-radius:999px;border:1px dashed var(--line);color:var(--muted);font-weight:600;font-size:14px}
.pv{white-space:normal}.pv p{margin-bottom:14px}.pv p:last-child{margin-bottom:0}