:root{--bg:#0E1B2C;--surface:#14263A;--line:#243A52;--fg:#E8F1F2;--muted:#93A8B8;--accent:#2DD4BF;--accent-ink:#0E1B2C;--warn:#FFB547;--amber:#FFB547;--trunk:#8B7CF6;--chassis:#1a3048;--bad:#FF6B5E;--ok:#2DD4BF;--net:#2DD4BF;--prog:#8B7CF6;--sec:#FF6B5E;--mono:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;--sans:'Sora','IBM Plex Sans',system-ui,-apple-system,Segoe UI,sans-serif;color-scheme:dark}
@media (prefers-color-scheme:light){:root:not([data-theme="dark"]){--bg:#F4F8F9;--surface:#fff;--line:#d3e0e3;--fg:#0E1B2C;--muted:#506879;--accent:#0F766E;--accent-ink:#fff;--warn:#8a5a00;--amber:#b7791f;--trunk:#6558d9;--chassis:#e4eef0;--bad:#c4372b;--ok:#0F766E;--net:#0F766E;--prog:#6558d9;--sec:#c4372b;color-scheme:light}}
:root[data-theme="light"]{--bg:#F4F8F9;--surface:#fff;--line:#d3e0e3;--fg:#0E1B2C;--muted:#506879;--accent:#0F766E;--accent-ink:#fff;--warn:#8a5a00;--amber:#b7791f;--trunk:#6558d9;--chassis:#e4eef0;--bad:#c4372b;--ok:#0F766E;--net:#0F766E;--prog:#6558d9;--sec:#c4372b;color-scheme:light}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:16px;line-height:1.6;margin:0}
a{color:var(--accent)}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.wrap{max-width:1040px;margin-inline:auto;padding-inline:20px}
header.top{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-start;gap:12px 32px;padding:12px clamp(16px,2.5vw,32px);border-bottom:1px solid var(--line);background:var(--surface);width:100%}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--mono);font-weight:700;font-size:15px;text-decoration:none;color:var(--fg)}
.brand svg{width:56px;height:32px;display:block;color:var(--fg);flex:none}.lockname{display:flex;flex-direction:column;gap:3px}.lockname b{font-size:21px;line-height:1.1;letter-spacing:-.01em}
.lockname i{font-style:normal;font-weight:400;font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
nav.menu{display:flex;flex-wrap:wrap;gap:6px 28px;font-family:var(--sans);font-weight:500;font-size:15px;align-items:center}
nav.menu a,nav.menu .link{color:var(--muted);text-decoration:none;font:inherit}nav.menu a:hover,nav.menu .link:hover{color:var(--fg)}nav.menu a{padding-block:4px;border-bottom:2px solid transparent}nav.menu a:hover{border-bottom-color:var(--accent)}
nav.menu form{display:inline;margin:0}.link{background:none;border:0;cursor:pointer;padding:0}
.top-right{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.login{font-family:var(--mono);font-size:13px;border:1px solid var(--accent);padding:7px 14px;text-decoration:none;color:var(--accent)}.login:hover{background:var(--accent);color:var(--accent-ink)}
#themeBtn{background:none;border:1px solid var(--line);color:var(--muted);padding:6px 8px;cursor:pointer;display:inline-flex;align-items:center;line-height:0}#themeBtn:hover{color:var(--fg)}
.small,.user{font-family:var(--mono);font-size:12px;color:var(--muted)}
main{padding-block:36px 56px}
h1,h2,h3{font-family:var(--mono);line-height:1.2;letter-spacing:-.01em;text-wrap:balance}h1{font-size:clamp(26px,4vw,40px);margin:0 0 12px;letter-spacing:-.02em}h2{font-size:clamp(18px,2.4vw,22px);margin:0 0 10px}
.lead{color:var(--muted);max-width:62ch;font-size:17px}
.tag,.label{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin:0 0 8px;display:block}
.card{background:var(--surface);border:1px solid var(--line);padding:18px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px;margin-top:20px}
.btn,button.btn{font-family:var(--mono);font-size:14px;font-weight:500;padding:12px 20px;text-decoration:none;border:1px solid var(--accent);display:inline-block;background:var(--accent);color:var(--accent-ink);cursor:pointer;border-radius:0}
.btn.alt{background:transparent;color:var(--accent)}.btn:hover{filter:brightness(1.1)}
.bar{height:6px;background:var(--line);margin:10px 0 4px}.bar i{display:block;height:100%;background:var(--accent)}
.mod{margin-top:18px}.mod h2{margin:0 0 8px}
.row{display:flex;align-items:center;gap:12px;padding:11px 6px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--fg)}.row:last-child{border-bottom:0}
.dot{width:20px;height:20px;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font-size:12px;flex:none;color:var(--accent-ink)}.dot.on{background:var(--accent);border-color:var(--accent)}
.row .kind{margin-left:auto;font-family:var(--mono);font-size:12px;color:var(--muted)}.row.lock{opacity:.5}
.lay{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:22px}@media(max-width:900px){.lay{grid-template-columns:1fr}.side{order:2}}
.video{position:relative;padding-top:56.25%;background:#000;border:1px solid var(--line)}.video iframe,.video video{position:absolute;inset:0;width:100%;height:100%;border:0}
.soon{aspect-ratio:16/9;display:grid;place-items:center;background:var(--surface);border:1px dashed var(--line);color:var(--muted);font-family:var(--mono)}
.lab{width:100%;height:760px;display:block;border:1px solid var(--line);background:var(--surface)}
.nav{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px;align-items:center}.nav .sp,.sp{flex:1}
.body{margin-top:18px}.body img{max-width:100%}
.q{margin-top:14px}.q label{display:flex;gap:10px;padding:9px 12px;border:1px solid var(--line);margin-top:8px;cursor:pointer;background:var(--bg)}.q label:has(input:checked){border-color:var(--accent)}
.q.good{border-left:3px solid var(--ok)}.q.wrong{border-left:3px solid var(--bad)}
.msg{padding:10px 14px;margin:0 0 14px;border:1px solid var(--line);background:var(--surface);font-family:var(--mono);font-size:14px}.msg.error{border-color:var(--bad)}.msg.success{border-color:var(--accent)}
input[type=text],input[type=password],input[type=email],input[type=search]{width:100%;padding:10px;border:1px solid var(--line);background:var(--bg);color:var(--fg);font:inherit;border-radius:0}
.side .row{padding:8px 4px;font-size:14px}.side .row.cur{background:color-mix(in srgb,var(--accent) 12%,transparent)}
.auth{max-width:440px;margin:24px auto}.auth label{display:block;margin-top:12px;font-weight:600}
.big{font:700 44px var(--mono)}.ok{color:var(--ok)}.bad{color:var(--bad)}
.foot{margin-top:48px;padding-top:18px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}
.cimg{display:block;width:100%;aspect-ratio:1280/600;object-fit:cover;border:1px solid var(--line);background:#0c1214}
.cov{padding:0;overflow:hidden;display:flex;flex-direction:column}.cov>a{display:block}.cov .cimg{border:0;border-bottom:1px solid var(--line)}.cb{padding:14px 18px 18px;flex:1;display:flex;flex-direction:column;align-items:flex-start}.cb .bar{align-self:stretch}
.chead{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,380px);gap:24px;align-items:center}@media(max-width:760px){.chead{grid-template-columns:1fr}.chead .cimg{order:-1}}
.bdg{display:flex;gap:16px;align-items:center}.bdg img{flex:none}

/* split login */
body.split{margin:0}.split-login{display:grid;grid-template-columns:1fr 1fr;min-height:100vh}
.sl-art{background:#0c1214;position:relative;overflow:hidden;display:flex;align-items:flex-end;padding:48px;color:#e8f1ee}
.sl-art svg.net{position:absolute;inset:0;width:100%;height:100%}.sl-art .cap{position:relative;max-width:420px}.sl-art .cap b{font-family:var(--mono);font-size:26px;display:block;margin-bottom:8px}.sl-art .cap span{color:#9db3ad}
.sl-form{display:flex;align-items:center;justify-content:center;padding:32px;background:var(--bg)}.sl-in{width:100%;max-width:380px}
.sl-in .brand{margin-bottom:28px}.sl-in h1{font-size:28px;margin:0 0 18px}.sl-in label{display:block;margin-top:14px;font-weight:600}
.sl-in input[type=text],.sl-in input[type=password]{width:100%}.pw{position:relative}.pw input{padding-right:44px}
.pw button{position:absolute;right:4px;top:50%;transform:translateY(-50%);background:none;border:0;color:var(--muted);cursor:pointer;padding:8px}
.sl-in .btn{width:100%;margin-top:20px;padding:12px;font-size:16px}.sl-in .sub{margin-top:16px;font-size:14px;color:var(--muted)}.sl-in .sub a{color:var(--accent)}
.sl-theme{position:fixed;top:12px;right:16px}
@media(max-width:800px){.split-login{grid-template-columns:1fr}.sl-art{display:none}}

.top-right{margin-left:auto}
.dash h2{font-size:15px;font-family:var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin:34px 0 12px}
.cont{display:grid;grid-template-columns:200px minmax(0,1fr) auto;gap:20px;align-items:center;padding:0;overflow:hidden;margin-bottom:12px}
.cont .cimg{border:0;height:100%;object-fit:cover}.cont .cb2{padding:14px 0}.cont .act{padding:14px 18px 14px 0}
.cont h3{margin:2px 0 6px;font-size:18px}.cont h3 a{color:inherit;text-decoration:none}
@media(max-width:700px){.cont{grid-template-columns:1fr}.cont .cb2,.cont .act{padding:0 16px 16px}}

/* ---- mobile ---- */
@media(max-width:640px){
header.top{gap:6px 10px;padding:8px 14px}
.brand{gap:8px;flex:1;min-width:0}.brand svg{width:44px;height:25px}
.lockname b{font-size:16px}.lockname i{display:none}
.top-right{margin-left:0;gap:8px;flex-wrap:nowrap}
.top-right .user{display:none}
.top-right .login,.top-right .btn{padding:6px 10px!important;font-size:12px!important;white-space:nowrap}
#themeBtn{padding:5px 8px}
nav.menu{order:3;width:100%;flex-wrap:nowrap;overflow-x:auto;gap:4px 20px;font-size:14px;scrollbar-width:none;-webkit-overflow-scrolling:touch;margin:0 -2px;padding-bottom:2px}
nav.menu::-webkit-scrollbar{display:none}nav.menu a{white-space:nowrap;padding-block:3px}
.tag,.label{letter-spacing:.08em;font-size:11px}
.wrap{padding-inline:14px}
}

/* themed HTML course banner (replaces the generated image) */
.cv{--cc:var(--c);position:relative;display:inline-flex;width:100%;box-sizing:border-box;vertical-align:top;align-items:center;justify-content:space-between;gap:12px;min-height:104px;padding:14px 16px 14px 22px;background:var(--surface);border:1px solid var(--line);color:var(--fg);overflow:hidden}
.cv::before{content:"";position:absolute;left:0;top:0;bottom:0;width:7px;background:var(--cc)}
@media(prefers-color-scheme:light){:root:not([data-theme="dark"]) .cv{--cc:color-mix(in srgb,var(--c) 58%,#0E1B2C)}}
:root[data-theme="light"] .cv{--cc:color-mix(in srgb,var(--c) 58%,#0E1B2C)}
.cv-t{display:flex;flex-direction:column;gap:3px;min-width:0}
.cv-brand{display:flex;align-items:center;gap:7px;font:500 10px var(--mono);letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.cv-code{font:700 clamp(22px,3.4vw,30px)/1.1 var(--mono);color:var(--cc);letter-spacing:-.01em;overflow-wrap:break-word}.cv-code.t{font-size:17px;line-height:1.25}
.cv-track{font:12px var(--mono);color:var(--muted)}
.cv-r{display:flex;align-items:center;gap:10px;flex:none}
.cv-pill{font:700 10px var(--mono);letter-spacing:.12em;text-transform:uppercase;background:var(--cc);color:var(--accent-ink,#0c1214);padding:4px 8px;border-radius:5px;white-space:nowrap}
:root:not([data-theme="light"]) .cv-pill{color:#04201a}
.cv-ico{width:58px;height:58px;padding:7px;border:1px solid var(--line);border-radius:12px;background:var(--bg);color:var(--cc);flex:none}
.cont .cv{height:100%}.chead .cv{min-height:112px}
@media(max-width:640px){.cv{min-height:78px;padding:10px 12px 10px 18px}.cv-ico{width:46px;height:46px;padding:6px}.cv-brand{display:none}.cv-pill{display:none}}
.cont .cv-brand,.cont .cv-pill{display:none}.cont .cv{padding-right:10px}.cont .cv-ico{width:40px;height:40px;padding:5px}
.cont .cv-code.t,.chead .cv-code.t{display:none}

.cv-code.t{display:none}
.cv.nc{min-height:60px;padding-block:8px}.cv.nc .cv-brand{display:flex;font-size:11px}.cv.nc .cv-t{justify-content:center}
.cv.nc .cv-ico{width:42px;height:42px;padding:5px}
.chead .cv.nc,.cont .cv.nc{justify-content:space-between}
@media(max-width:640px){.cv.nc{min-height:52px}.cv.nc .cv-brand{display:flex}.cv.nc .cv-ico{width:36px;height:36px}}

.bdgw{--cc:var(--c);display:inline-block;color:var(--fg);flex:none}.bdgsvg{display:block;width:100%;height:100%}
@media(prefers-color-scheme:light){:root:not([data-theme="dark"]) .bdgw{--cc:color-mix(in srgb,var(--c) 58%,#0E1B2C)}}
:root[data-theme="light"] .bdgw{--cc:color-mix(in srgb,var(--c) 58%,#0E1B2C)}

.chead .cv,.cont .cv{justify-content:space-between}
.cv-t{flex:1;min-width:0}.cv-track{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.cv-brand{white-space:nowrap}
.cont .cv.nc .cv-brand,.cont .cv .cv-brand{display:none}
.cont .cv-t{justify-content:center}
.cv-t{overflow:hidden}.cov .cv-brand{display:none}.cov .cv.nc{min-height:64px}
.cv-pill{align-self:flex-start;margin-top:5px}
.bdgwrap{display:inline-flex;flex-direction:column;align-items:center;gap:6px}.bdgsave{padding:5px 10px!important;font-size:12px!important}
/* bigger banner icon */
.cv-ico{width:76px;height:76px;padding:6px;border-radius:14px}
.cv.nc{min-height:76px}.cv.nc .cv-ico{width:60px;height:60px;padding:5px}
.cont .cv-ico,.cont .cv.nc .cv-ico{width:52px;height:52px;padding:5px}
@media(max-width:640px){.cv-ico{width:58px;height:58px;padding:5px}.cv.nc{min-height:64px}.cv.nc .cv-ico{width:48px;height:48px;padding:4px}}
.bgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.bdgc{display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px}.bdgc h3{margin:2px 0}.bdgc .tag{margin:0}
.bdgsvg text:last-of-type{font-size:26px;letter-spacing:3px}

/* ---- brand layer: Sora headings, rounded cards, track colors ---- */
h1,h2,h3{font-family:var(--sans);font-weight:700;letter-spacing:-.02em}
.card{border-radius:14px}.btn,button.btn{border-radius:10px;font-family:var(--sans);font-weight:600}.login{border-radius:10px}
.msg,.bar,.bar i{border-radius:10px}.bar,.bar i{border-radius:6px}
input[type=text],input[type=password],input[type=email],input[type=search],select,textarea{border-radius:10px}
header.top{background:var(--bg);border-bottom:2px solid var(--accent)}
.brand{font-family:var(--sans)}.brand svg.fav{width:42px;height:42px}.lockname b{font-family:var(--sans);font-weight:700}
.cv{border-radius:14px}.cv-code{font-family:var(--mono)}
.cv-brand svg{border-radius:4px}
.trk{display:inline-flex;align-items:center;gap:6px;font:600 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--c,var(--accent))}.trk i{width:9px;height:9px;border-radius:50%;background:var(--c,var(--accent))}
.strips{display:flex;gap:4px;height:4px}.strips i{flex:1;border-radius:4px}.strips i:nth-child(1){background:var(--net)}.strips i:nth-child(2){background:var(--prog)}.strips i:nth-child(3){background:var(--sec)}
.cv .cv-track{color:var(--cc)}.landing h2{font-family:var(--sans);letter-spacing:-.02em}
/* header lockup: bigger icon and name, tagline stretched to the name's width */
.brand{gap:14px}.brand svg.fav{width:54px;height:54px}
.lockname{display:inline-flex;flex-direction:column;align-items:stretch;gap:5px}
.lockname b{font-size:29px;letter-spacing:-.02em;white-space:nowrap}
.lockname i{font-size:9px;letter-spacing:.08em;white-space:nowrap;text-align:justify;text-align-last:justify;word-spacing:0}
@media(max-width:640px){.brand svg.fav{width:40px;height:40px}.lockname b{font-size:17px}}

/* banner: track-colored icon box, no logo */
.cv-brand{display:none!important}
.cv .cv-ico{background:var(--c);color:#0E1B2C;border-color:transparent;border-radius:14px}
.cv.nc .cv-code.t,.cont .cv.nc .cv-code.t,.chead .cv.nc .cv-code.t{display:block!important;font-size:17px;line-height:1.25;color:var(--cc)}
/* header nav centered between the logo and the account buttons */
header.top{flex-wrap:nowrap}
header.top nav.menu{flex:1 1 auto;justify-content:center}
header.top .top-right{margin-left:0}
@media(max-width:900px){header.top{flex-wrap:wrap}header.top nav.menu{order:3;width:100%;justify-content:flex-start}}
/* lab groups collapse */
.lb-h{cursor:pointer;user-select:none;display:flex;align-items:center;gap:8px}
.lb-h::before{content:"";width:0;height:0;border-left:6px solid var(--muted);border-top:5px solid transparent;border-bottom:5px solid transparent;transition:transform .15s}
.lb-h[aria-expanded="true"]::before{transform:rotate(90deg)}
.lb .lb-g.closed{display:none!important}.lb-all{margin-left:10px}
.lb-all{font:inherit;font-size:13px;background:none;border:1px solid var(--line);color:var(--mute);border-radius:8px;padding:5px 10px;cursor:pointer}
.lb-all:hover{color:var(--ink)}

.trkbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:14px 0 6px}.trkbar a{text-decoration:none;color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:14px}.trkbar a small{color:var(--mute)}.trkbar a.on{background:var(--c,var(--accent));border-color:var(--c,var(--accent));color:#0E1B2C;font-weight:600}.trkbar a.on small{color:#0E1B2C}.trkbar .sp{flex:1}.trkbar select{font:inherit;margin-left:4px}
.trkh{margin:26px 0 10px;padding-left:12px;border-left:5px solid var(--c)}.trkh small{font-size:13px;color:var(--mute);font-weight:400;margin-left:6px}

/* login v2 */
.sl2{background:radial-gradient(ellipse at 30% 30%,#17304a 0%,#0E1B2C 60%,#0a1522 100%);align-items:center;justify-content:center;padding:48px}
.sl2 .ring{position:absolute;right:-380px;bottom:-380px;opacity:.12;pointer-events:none}.sl2 .ring svg{display:block;width:900px;height:900px}
.sl2-in{position:relative;max-width:460px}.sl2-in>svg{width:120px;height:120px;display:block}
.sl2-in h2{font:700 38px/1.15 var(--sans);margin:26px 0 10px;color:#fff;letter-spacing:-.02em}.sl2-in>p{color:#AFC2D2;font-size:17px;margin:0 0 30px}
.sl2-trk{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.sl2-trk li{display:grid;grid-template-columns:48px 1fr;column-gap:14px;align-items:center;background:rgba(20,38,58,.75);border:1px solid #243A52;border-left:4px solid var(--c);border-radius:12px;padding:12px 16px}
.sl2-trk svg{grid-row:1/3;width:44px;height:44px;color:var(--c);stroke:var(--c)}.sl2-trk b{color:#fff;font-size:17px}.sl2-trk span{color:#93A8B8;font-size:13px}
.sl2-brand{display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--fg);margin-bottom:26px}
.sl2-brand svg{width:56px;height:56px;flex:none}.sl2-brand b{display:block;font:700 26px/1.1 var(--sans);letter-spacing:-.02em;white-space:nowrap}
.sl2-brand i{display:block;font:500 10px var(--mono);font-style:normal;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-top:5px;white-space:nowrap}
.sl2-back{position:absolute;top:18px;left:24px;font-size:14px;color:var(--muted);text-decoration:none}.sl2-back:hover{color:var(--accent)}.sl-form{position:relative}

/* =====================================================================
   Charm layer: track colors, glow, lift, rings, footer, mobile menu
   ===================================================================== */
:root{--ink:var(--fg);--mute:var(--muted);--glow-a:rgba(45,212,191,.16);--glow-b:rgba(139,124,246,.14);--glow-c:rgba(255,107,94,.10);--shadow:0 10px 30px rgba(0,0,0,.28);--cardbg:color-mix(in srgb,var(--surface) 88%,transparent)}
@media (prefers-color-scheme:light){:root:not([data-theme="dark"]){--glow-a:rgba(15,118,110,.12);--glow-b:rgba(101,88,217,.10);--glow-c:rgba(196,55,43,.07);--shadow:0 10px 26px rgba(14,27,44,.12)}}
:root[data-theme="light"]{--glow-a:rgba(15,118,110,.12);--glow-b:rgba(101,88,217,.10);--glow-c:rgba(196,55,43,.07);--shadow:0 10px 26px rgba(14,27,44,.12)}
/* a track-colored scope: --c is the raw brand color, --tcc is the one safe for text and lines in this theme */
.tcs{--tcc:var(--c)}
@media (prefers-color-scheme:light){:root:not([data-theme="dark"]) .tcs{--tcc:color-mix(in srgb,var(--c) 58%,#0E1B2C)}}
:root[data-theme="light"] .tcs{--tcc:color-mix(in srgb,var(--c) 58%,#0E1B2C)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
body{background:var(--bg);background-image:radial-gradient(900px 420px at 12% -80px,var(--glow-a),transparent 70%),radial-gradient(800px 420px at 92% -60px,var(--glow-b),transparent 70%);background-repeat:no-repeat}
header.top{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);background:color-mix(in srgb,var(--bg) 88%,transparent);border-bottom:0;box-shadow:0 1px 0 var(--line)}
header.top::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:linear-gradient(90deg,var(--net),var(--prog),var(--sec))}
nav.menu a{border-bottom-width:2px;transition:color .15s,border-color .15s}
nav.menu a:hover,nav.menu a:focus-visible{border-bottom-color:var(--amber)}
/* buttons */
.btn,button.btn{transition:transform .15s,box-shadow .15s,filter .15s,background .15s;box-shadow:0 1px 0 rgba(255,255,255,.18) inset}
.btn:hover{transform:translateY(-1px);filter:none;box-shadow:0 6px 16px color-mix(in srgb,var(--accent) 35%,transparent)}
.btn:active{transform:none}
.btn.alt:hover{background:color-mix(in srgb,var(--accent) 12%,transparent)}
.btn:focus-visible,.login:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
.login{transition:background .15s,color .15s}
/* cards: glass, lift, colored top border */
.card{background:var(--cardbg);backdrop-filter:blur(6px)}
.cov,.cc,.cont,a.trkcard{position:relative;transition:transform .18s,box-shadow .18s,border-color .18s}
.cov::before,.cont::before,.cc::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:var(--tcc,var(--accent));opacity:.55;transition:opacity .18s,height .18s;z-index:1;border-radius:14px 14px 0 0}
.cont::before{right:auto;bottom:0;width:4px;height:auto;border-radius:14px 0 0 14px}
.cov:hover,.cov:focus-within,.cc:hover,.cont:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:color-mix(in srgb,var(--tcc,var(--accent)) 55%,var(--line))}
.cov:hover::before,.cov:focus-within::before,.cc:hover::before,.cont:hover::before{opacity:1}
.cov:hover::before{height:4px}
.cb h2,.cb h3{line-height:1.25}
.meta2{display:flex;flex-wrap:wrap;gap:6px 12px;align-items:center;margin:0 0 10px}
.cov .trk,.cc .trk{color:var(--tcc,var(--accent))}
.cov .trk i{background:var(--tcc,var(--accent))}
.trkh{border-left-color:var(--tcc,var(--c))}
.trkh::after{content:"";display:block;height:1px;margin-top:8px;background:linear-gradient(90deg,var(--tcc),transparent 60%);opacity:.35}
.trkbar a{transition:border-color .15s,background .15s;color:var(--fg)}.trkbar a:hover{border-color:var(--c,var(--accent))}
.trkbar a.on{color:#0E1B2C}
.trkbar small{color:var(--muted)}
/* progress: track colored bars and rings */
.bar{height:8px;background:color-mix(in srgb,var(--line) 80%,transparent);overflow:hidden}
.bar i{background:linear-gradient(90deg,var(--tcc,var(--accent)),color-mix(in srgb,var(--tcc,var(--accent)) 65%,var(--amber)));transition:width .6s cubic-bezier(.2,.8,.2,1)}
.dot.on{background:var(--tcc,var(--accent));border-color:var(--tcc,var(--accent))}
.row{transition:background .12s}.mod .row:hover:not(.lock),.side .row:hover{background:color-mix(in srgb,var(--tcc,var(--accent)) 8%,transparent)}
.side .row.cur{background:color-mix(in srgb,var(--tcc,var(--accent)) 14%,transparent);box-shadow:inset 3px 0 0 var(--tcc,var(--accent))}
.side{border-top:3px solid var(--tcc,var(--accent))}
.mod.card h2{display:flex;align-items:baseline;gap:10px}.mod h2 .small{margin-left:auto}
.ring{--p:0;--s:56px;width:var(--s);height:var(--s);border-radius:50%;flex:none;display:grid;place-items:center;background:radial-gradient(closest-side,var(--surface) 72%,transparent 74% 100%),conic-gradient(var(--tcc,var(--accent)) calc(var(--p)*1%),color-mix(in srgb,var(--line) 85%,transparent) 0)}
.ring b{font:700 12px var(--mono);color:var(--fg)}
.cont .act{display:flex;align-items:center;gap:14px}
@media(max-width:700px){.cont .act{padding:0 16px 16px}.cont::before{width:auto;height:4px;bottom:auto;right:0;border-radius:14px 14px 0 0}}
/* page heads, glow, chips */
.pghead{position:relative;padding:6px 0 4px}
.pghead::before,.hero2::before{content:"";position:absolute;inset:-60px 0 auto 0;height:260px;background:radial-gradient(420px 200px at 20% 40%,var(--glow-a),transparent 70%),radial-gradient(380px 200px at 75% 30%,var(--glow-b),transparent 70%),radial-gradient(300px 160px at 55% 80%,var(--glow-c),transparent 70%);pointer-events:none;z-index:-1}
.chipi{display:inline-grid;place-items:center;width:22px;height:22px;border-radius:7px;background:color-mix(in srgb,var(--accent) 16%,transparent);margin-right:8px;vertical-align:-5px}
.label{display:flex;align-items:center}
/* empty states with the cursor motif (a mascot can replace .empty-cur later: keep the slot) */
.empty{text-align:center;padding:34px 18px;border-style:dashed;margin-top:20px}.empty h3{margin:10px 0 4px;font-size:18px}.empty p{margin:0 0 4px}
.empty-cur{display:inline-flex;align-items:flex-end;gap:4px;font:700 34px/1 var(--mono);color:var(--accent)}
.empty-cur u{display:inline-block;width:20px;height:5px;background:var(--amber);text-decoration:none;margin-bottom:5px;border-radius:2px;animation:zcur 1.1s steps(2) infinite}
.empty-cur.big{font-size:56px}.empty-cur.big u{width:32px;height:7px}
@keyframes zcur{50%{opacity:0}}
@media(prefers-reduced-motion:reduce){.empty-cur u{animation:none}*{scroll-behavior:auto!important}.cov,.btn,a.trkcard{transition:none!important}.cov:hover,.cc:hover,.cont:hover,.btn:hover{transform:none}}
/* join */
.joinc{text-align:center;position:relative;overflow:hidden;border-top:3px solid var(--accent)}
.joinc::before{content:"";position:absolute;inset:-40px -20px auto;height:160px;background:radial-gradient(240px 120px at 50% 20%,var(--glow-a),transparent 70%);pointer-events:none}
.joinc>*{position:relative}.joinc form{text-align:left}.joinc-ico{margin-bottom:6px}
.joinc input{text-align:center;font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase}
/* account items in the header: desktop shows the original, the dropdown copy is mobile only */
.menu-acct{display:none}
.navbtn{display:none}
/* footer */
.sitefoot{margin-top:24px;background:linear-gradient(180deg,transparent,color-mix(in srgb,var(--surface) 70%,transparent));border-top:1px solid var(--line);position:relative}
.sf-strip{display:flex;height:3px}.sf-strip i{flex:1}.sf-strip i:nth-child(1){background:var(--net)}.sf-strip i:nth-child(2){background:var(--prog)}.sf-strip i:nth-child(3){background:var(--sec)}
.sf-in{max-width:1040px;margin:0 auto;padding:26px 20px 6px;display:flex;flex-wrap:wrap;gap:16px 40px;justify-content:space-between;align-items:center}
.sf-brand{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.sf-brand b{font-size:17px}
.sf-prompt{display:inline-flex;align-items:flex-end;gap:3px;font:700 20px/1 var(--mono);color:var(--accent)}.sf-prompt u{width:11px;height:3px;background:var(--amber);display:inline-block;margin-bottom:3px;animation:zcur 1.1s steps(2) infinite}
.sf-links{display:flex;flex-wrap:wrap;gap:6px 22px;font-size:14px}.sf-links a{color:var(--muted);text-decoration:none;padding:4px 0;border-bottom:2px solid transparent}.sf-links a:hover{color:var(--fg)}
.sf-links a.t-net{border-bottom-color:var(--net)}.sf-links a.t-prog{border-bottom-color:var(--prog)}.sf-links a.t-sec{border-bottom-color:var(--sec)}
.sitefoot .foot{max-width:1040px;margin:0 auto;padding:14px 20px 28px;border:0;font-size:12px;line-height:1.6}
/* mobile menu */
@media(max-width:1040px){
 header.top{flex-wrap:nowrap;gap:10px;position:sticky}
 .brand{flex:1;min-width:0}.brand svg.fav{width:38px;height:38px}.lockname b{font-size:17px}.lockname i{display:none}
 .navbtn{display:inline-flex;align-items:center;gap:8px;order:3;background:none;border:1px solid var(--line);color:var(--fg);padding:9px 12px;border-radius:10px;cursor:pointer;font:600 14px var(--sans);min-height:44px}
 .navbtn:hover{border-color:var(--accent)}.navbtn svg path{transition:transform .2s,opacity .2s;transform-origin:center}
 header.menu-open .navbtn .nb-a{transform:translateY(5px) rotate(45deg)}header.menu-open .navbtn .nb-b{opacity:0}header.menu-open .navbtn .nb-c{transform:translateY(-5px) rotate(-45deg)}
 .top-right{order:2;margin-left:0;flex-wrap:nowrap;gap:8px}.top-acct{display:none}
 #themeBtn{min-width:44px;min-height:44px;justify-content:center;border-radius:10px}
 header.top nav.menu{display:none;position:absolute;left:0;right:0;top:100%;order:unset;width:auto;flex-direction:column;align-items:stretch;flex-wrap:nowrap;overflow:visible;gap:0;margin:0;padding:8px 16px 14px;background:var(--bg);border-bottom:2px solid var(--accent);box-shadow:0 18px 30px rgba(0,0,0,.35);max-height:calc(100vh - 70px);overflow-y:auto;font-size:16px}
 header.top.menu-open nav.menu{display:flex}
 header.top nav.menu a,header.top nav.menu .link{display:flex;align-items:center;min-height:48px;padding:0 4px;border-bottom:1px solid var(--line);white-space:normal;color:var(--fg);font-size:16px}
 header.top nav.menu a:hover{border-bottom-color:var(--line);background:color-mix(in srgb,var(--accent) 8%,transparent)}
 .menu-acct{display:flex;flex-direction:column;margin-top:8px}.menu-acct form{display:block}.menu-acct .link{width:100%;text-align:left;color:var(--muted)}
 header.top nav.menu a.menu-cta{margin-top:10px;justify-content:center;background:var(--accent);color:var(--accent-ink);border:0;border-radius:10px;font-weight:600}
}
@media(max-width:560px){.navbtn-t{display:none}.navbtn{padding:9px 11px}.sf-in{padding-inline:14px}.sitefoot .foot{padding-inline:14px}}
html,body{overflow-x:clip}
.top-acct{display:flex;align-items:center;gap:12px}
.pghead::before,.hero2::before{-webkit-mask-image:linear-gradient(90deg,transparent,#000 18%,#000 82%,transparent),linear-gradient(180deg,#000 60%,transparent);-webkit-mask-composite:source-in;mask-image:linear-gradient(90deg,transparent,#000 18%,#000 82%,transparent),linear-gradient(180deg,#000 60%,transparent);mask-composite:intersect}
@media(max-width:1040px){.top-right .top-acct{display:none}}
@media(max-width:420px){.lockname b{font-size:15px}.brand svg.fav{width:34px;height:34px}.brand{gap:8px}}
[id]{scroll-margin-top:84px}
body{display:flex;flex-direction:column;min-height:100vh}body>.wrap{flex:1 0 auto;width:100%}body>header.top,body>.sitefoot{flex:none}
.lay>.side{align-self:start;position:sticky;top:90px}
@media(max-width:900px){.lay>.side{position:static}}
@media(prefers-reduced-motion:reduce){.sf-prompt u{animation:none}}

button.login.signout{background:transparent;cursor:pointer;line-height:inherit}button.login.signout:hover,button.login.signout:focus-visible{background:var(--accent);color:var(--accent-ink)}

/* header logo: the amber underscore blinks like a terminal cursor */
.cur-blink{animation:zt-cur 1.1s steps(1,end) infinite}@keyframes zt-cur{0%,55%{opacity:1}56%,100%{opacity:0}}@media(prefers-reduced-motion:reduce){.cur-blink{animation:none}}

/* nav redesign (2026-10-09) */
header.top{background:linear-gradient(180deg,var(--surface),color-mix(in srgb,var(--surface) 88%,var(--bg)));box-shadow:0 1px 0 var(--line),0 6px 18px rgba(0,0,0,.12)}
nav.menu a{position:relative;border-bottom:0!important;padding:6px 2px}
nav.menu a::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:linear-gradient(90deg,var(--net),var(--prog),var(--sec));transform:scaleX(0);transform-origin:left;transition:transform .2s}
nav.menu a:hover::after,nav.menu a:focus-visible::after,nav.menu a[aria-current="page"]::after{transform:scaleX(1)}
nav.menu a[aria-current="page"]{color:var(--fg)}
.umenu{position:relative}.umenu summary{list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);padding:6px 10px;color:var(--fg)}
.umenu summary::-webkit-details-marker{display:none}.umenu[open] summary,.umenu summary:hover{border-color:var(--accent)}
.umenu-p{position:absolute;right:0;top:calc(100% + 6px);min-width:170px;background:var(--surface);border:1px solid var(--line);box-shadow:0 12px 28px rgba(0,0,0,.3);z-index:30;display:flex;flex-direction:column;padding:6px}
.umenu-p a,.umenu-p .link{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:9px 10px;color:var(--fg);text-decoration:none;font:500 14px var(--sans);text-align:left;width:100%}
.umenu-p a:hover,.umenu-p .link:hover{background:color-mix(in srgb,var(--accent) 12%,transparent)}.umenu-p form{margin:0}
@media(max-width:900px){header.top.menu-open nav.menu a::after{display:none}header.top nav.menu a[aria-current="page"]{border-left:3px solid var(--accent);padding-left:8px}}
.lgrp{font:600 12px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:14px 0 4px;padding-top:10px;border-top:1px solid var(--line)}.lgrp:first-of-type{border-top:0;padding-top:0;margin-top:4px}

/* Watch / Read / Do / Check step colors (same four colors as the homepage "four parts" strip) */
[data-step=watch]{--sc:#2DD4BF}[data-step=read]{--sc:#8B7CF6}[data-step=do]{--sc:#FF6B5E}[data-step=check]{--sc:#FFB547}
.row[data-step]{border-left:3px solid var(--sc)}
.stp{display:inline-flex;align-items:center;gap:5px;font:600 11px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:color-mix(in srgb,var(--sc) 72%,var(--text))}
.stp svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* step tile: a thick colored block on the left holding the icon and the step name */
.mod .row[data-step]{border-left:0;padding:0 6px 0 0;min-height:56px;gap:14px}
.mod .row[data-step]>.stp{align-self:stretch;flex:none;width:72px;flex-direction:column;justify-content:center;gap:4px;margin:0;background:var(--sc);color:#0E1B2C;font-size:10px;letter-spacing:.08em}
.mod .row[data-step]>.stp svg{width:20px;height:20px;stroke-width:2.2}
.mod .row[data-step]:last-child>.stp{border-radius:0 0 0 8px}
.lgrp,.lgrp:first-of-type{font:700 15px var(--sans,inherit);letter-spacing:0;text-transform:none;color:var(--fg);margin:30px 0 8px;padding:0 0 8px;border:0;border-bottom:2px solid var(--line)}
.lgrp:first-of-type{margin-top:8px}
.mod .row[data-step]:not(:last-child){border-bottom:1px solid var(--line)}

.lgrp{display:flex;align-items:center;justify-content:space-between;gap:12px}
.gbar{display:inline-flex;align-items:center;gap:3px;font-weight:400}.gbar i{width:22px;height:6px;border-radius:3px;background:color-mix(in srgb,var(--sc) 22%,transparent)}.gbar i.on{background:var(--sc)}.gbar em{font:600 11px var(--mono);font-style:normal;color:var(--muted);margin-left:6px}
.sbar{margin:0 0 16px}.sb-h{font:700 13px var(--sans,inherit);margin-bottom:8px}
.sbar ol{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(0,1fr));gap:4px}
.sbar a{display:block;text-decoration:none;color:inherit}
.sbar li i{display:block;height:8px;border-radius:4px;background:color-mix(in srgb,var(--sc) 22%,transparent);margin-bottom:6px}
.sbar li.on i{background:var(--sc)}
.sbar li[aria-current] i{background:var(--sc);box-shadow:0 0 0 3px color-mix(in srgb,var(--sc) 35%,transparent)}
.sbar li:not([aria-current]) .stp{opacity:.75}

details.sgrp{margin-top:8px;border-top:1px solid var(--line)}details.sgrp>summary{display:flex;justify-content:space-between;align-items:center;gap:8px;cursor:pointer;list-style:none;padding:9px 4px;font:700 13px var(--sans,inherit);color:var(--fg)}
details.sgrp>summary::-webkit-details-marker{display:none}details.sgrp>summary::before{content:"";width:7px;height:7px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(-45deg);transition:transform .15s;flex:none}details.sgrp[open]>summary::before{transform:rotate(45deg)}
details.sgrp>summary span{flex:1}details.sgrp>summary em{font:600 11px var(--mono);font-style:normal;color:var(--muted)}
.lgrp,.lgrp:first-of-type{font-size:18px}
details.sgrp>summary{font-size:14.5px}
.sb-h{font-size:16px}

.resume{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:18px 0 6px;padding:20px 22px;border-radius:14px;border:1px solid color-mix(in srgb,var(--c) 45%,var(--line));border-left:6px solid var(--c);background:color-mix(in srgb,var(--c) 8%,var(--card,transparent))}
.resume>div{flex:1;min-width:0}.resume h2{margin:2px 0 6px!important;font:700 22px var(--sans,inherit)!important;text-transform:none!important;letter-spacing:0!important;color:var(--fg)!important}.resume .bar{margin:10px 0 4px}
@media(max-width:600px){.resume{flex-direction:column;align-items:stretch}}

details.lgd{margin:0}summary.lgrp{cursor:pointer;list-style:none;position:relative;padding-left:22px}
summary.lgrp::-webkit-details-marker{display:none}summary.lgrp::before{content:"";position:absolute;left:4px;top:50%;width:7px;height:7px;margin-top:-6px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(-45deg);transition:transform .15s}
details.lgd[open]>summary.lgrp::before{transform:rotate(45deg);margin-top:-8px}
details.lgd:not([open])>summary.lgrp{border-bottom-color:var(--line);margin-bottom:0}

@media(min-width:1041px){nav.menu .menu-adm{display:none}}

details.lgd>summary.lgrp{padding-left:24px}
details.lgd>summary.lgrp::before{left:6px}

.gbar{gap:5px}
.gbar b{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;background:color-mix(in srgb,var(--sc) 14%,transparent);color:color-mix(in srgb,var(--sc) 55%,var(--muted));border:1.5px solid color-mix(in srgb,var(--sc) 35%,transparent)}
.gbar b svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.gbar b.on{background:var(--sc);border-color:var(--sc);color:#0E1B2C}

.lgo{padding:10px 0 6px 24px}.lgo .btn{padding:7px 16px;font-size:14px}

.ctas{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.ctas .btn.alt{padding:8px 16px;font-size:14px}

.lgo{display:none}
summary.lgrp>.gt{flex:1;min-width:0}
summary.lgrp .gogo{flex:none;font:600 12px var(--sans,inherit);text-transform:none;letter-spacing:0;text-decoration:none;color:var(--sc,#0E1B2C);background:var(--accent);color:var(--accent-ink,#0E1B2C);padding:5px 12px;border-radius:999px;margin-right:8px}
summary.lgrp .gogo:hover{filter:brightness(1.08)}
@media(max-width:560px){summary.lgrp{flex-wrap:wrap}summary.lgrp .gt{flex-basis:100%}}

/* final exam row (course page) and lock marks (lesson list) */
.xcard{margin-top:14px;padding:0;overflow:hidden;border-style:dashed}
.xrow{display:flex;align-items:center;gap:16px;padding:18px 20px;text-decoration:none;color:var(--fg)}
.xlock{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;flex:none;background:color-mix(in srgb,var(--muted) 16%,transparent);color:var(--muted)}
.xlock svg,.xlk svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.xt{display:flex;flex-direction:column;gap:2px;min-width:0}.xt b{font-size:17px}.xt small{color:var(--muted)}
.xgo{margin-left:auto;font-family:var(--mono);font-size:13px;padding:7px 14px;border-radius:9px;border:1px solid var(--line);color:var(--muted);white-space:nowrap}
.xcard.open{border-style:solid;border-color:color-mix(in srgb,var(--accent) 55%,var(--line))}
.xcard.open .xlock{background:color-mix(in srgb,var(--accent) 20%,transparent);color:var(--accent)}
.xcard.open .xgo{background:var(--accent);border-color:var(--accent);color:#06131a;font-weight:700}
.xcard.open .xrow:hover{background:color-mix(in srgb,var(--accent) 6%,transparent)}
.xrow[aria-disabled="true"]{cursor:not-allowed}
.xlk{margin-left:auto;display:inline-grid;place-items:center;color:var(--accent)}.xlk.shut{color:var(--muted)}.xlk svg{width:16px;height:16px}
@media(max-width:560px){.xrow{flex-wrap:wrap;padding:14px}.xgo{margin-left:60px}}

/* bell */
.bell{position:relative}.bell summary{list-style:none;cursor:pointer;display:inline-grid;place-items:center;width:36px;height:36px;border:1px solid var(--line);color:var(--fg);position:relative}
.bell summary::-webkit-details-marker{display:none}.bell[open] summary,.bell summary:hover{border-color:var(--accent)}
.bn{position:absolute;top:-7px;right:-7px;min-width:18px;height:18px;padding:0 4px;border-radius:9px;background:var(--bad,#FF6B5E);color:#0E1B2C;font:700 11px/18px var(--mono);text-align:center}
.bell-p{position:absolute;right:0;top:calc(100% + 6px);width:min(320px,86vw);background:var(--surface);border:1px solid var(--line);box-shadow:0 12px 28px rgba(0,0,0,.3);z-index:30;display:flex;flex-direction:column;padding:6px}
.bell-p a{display:block;padding:10px;color:var(--fg);text-decoration:none;font:500 14px var(--sans);border-radius:6px}.bell-p a:hover{background:color-mix(in srgb,var(--accent) 12%,transparent)}
.bell-p .bh{margin:4px 10px 6px;font:700 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.bell-p .be{margin:6px 10px 10px;color:var(--muted);font-size:14px}
.bell-p .ball{border-top:1px solid var(--line);margin-top:4px;color:var(--accent);font-size:13px}
@media(max-width:1040px){.top-right .bell{display:block}}

.iconbtn{display:inline-grid;place-items:center;width:36px;height:36px;border:1px solid var(--line);color:var(--fg);text-decoration:none}.iconbtn:hover,.iconbtn[aria-current="page"]{border-color:var(--accent);color:var(--accent)}
/* tablet widths: keep the header on one row */
@media(min-width:1041px) and (max-width:1200px){header.top{gap:12px 14px}header.top nav.menu{gap:6px 14px;font-size:14px}header.top .top-right{flex-wrap:nowrap;gap:8px}.lockname b{font-size:24px}.lockname i{letter-spacing:.04em}.brand svg.fav{width:38px;height:38px}}
/* sale prices and promo codes */
s{opacity:.65}.sale{color:var(--accent,#2f7d6d);font-weight:600}
details.promo{margin-top:12px;max-width:420px}details.promo summary{cursor:pointer;color:var(--muted,inherit)}
.promo-f{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:8px}.promo-f label{flex:0 0 100%}.promo-f input{flex:1 1 160px;min-width:0;text-transform:uppercase}
.promo-err{color:var(--bad);font-weight:600}
/* dashboard tabs */
.dtabs{display:flex;gap:4px;flex-wrap:wrap;border-bottom:1px solid var(--line);margin:6px 0 22px;overflow-x:auto}
.dtabs button{font:600 13px var(--mono);background:none;border:0;border-bottom:3px solid transparent;color:var(--muted);padding:11px 15px;cursor:pointer;white-space:nowrap;margin-bottom:-1px}
.dtabs button:hover{color:var(--fg)}
.dtabs button[aria-selected="true"]{color:var(--fg);border-bottom-color:var(--accent)}
.dtabs .n{display:inline-block;font-size:11px;color:var(--muted);border:1px solid var(--line);border-radius:99px;padding:0 7px;margin-left:4px}
.dpane[hidden]{display:none}
.dprog .pr{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(80px,2fr) auto;gap:14px;align-items:center;padding:9px 0;border-bottom:1px solid var(--line)}
.dprog .pr:last-child{border-bottom:0}
.dprog .bar{margin:0}
.dorders .or{display:grid;grid-template-columns:110px 1fr auto;gap:14px;align-items:baseline;padding:10px 0;border-bottom:1px solid var(--line)}
.dorders .or:last-child{border-bottom:0}
.dorders .amt{font-family:var(--mono)}
@media(max-width:640px){.dprog .pr{grid-template-columns:1fr}.dorders .or{grid-template-columns:1fr auto}.dorders .or .small{grid-column:1/-1}}

.newtag,.saletag{display:inline-block;font:700 10px var(--mono);letter-spacing:.08em;text-transform:uppercase;border-radius:999px;padding:2px 8px;vertical-align:middle;border:1px solid var(--accent);color:var(--accent)}
.saletag{border-color:var(--warn);color:var(--warn)}
.csh{margin:28px 0 10px;font-size:20px}
.cs-tbl{overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:var(--surface)}
.cs-tbl table{width:100%;border-collapse:collapse;font-size:15px}
.cs-tbl th{text-align:left;font:600 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);padding:12px 16px;border-bottom:1px solid var(--line)}
.cs-tbl td{padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.cs-tbl tr:last-child td{border-bottom:0}
.cs-sum{display:block;margin-top:4px;color:var(--muted)}
.cs-rel{font-family:var(--mono);white-space:nowrap}

/* footer v2 */
.sf-cta{max-width:1040px;margin:0 auto;padding:26px 20px 4px;display:flex;flex-wrap:wrap;gap:14px 30px;justify-content:space-between;align-items:center}
.sf-cta b{display:block;font-size:20px}
.sf-cta-b{display:flex;gap:10px;flex-wrap:wrap}
.sf-in{align-items:flex-start;padding-top:22px;border-top:0}
.sf-brand{flex-direction:row;max-width:340px}
.sf-news{flex-basis:100%;margin:6px 0 0}
.sf-follow{flex-basis:100%;margin-top:8px}.sf-follow ul{list-style:none;display:flex;gap:8px;padding:0;margin:6px 0 0}
.sf-follow a{display:inline-flex;width:38px;height:38px;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:50%;color:var(--muted)}
.sf-follow a:hover{color:var(--fg);border-color:var(--accent)}
.sf-cols{display:grid;grid-template-columns:repeat(4,minmax(110px,1fr));gap:18px 36px;font-size:14px}
.sf-cols h2{font:700 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:0 0 8px}
.sf-cols a{display:block;color:var(--muted);text-decoration:none;padding:4px 0}.sf-cols a:hover{color:var(--fg)}
.sf-cols a.t-net{border-left:3px solid var(--net);padding-left:8px}.sf-cols a.t-prog{border-left:3px solid var(--prog);padding-left:8px}.sf-cols a.t-sec{border-left:3px solid var(--sec);padding-left:8px}
@media(max-width:760px){.sf-cols{grid-template-columns:repeat(2,minmax(0,1fr));width:100%}.sf-brand{max-width:none}}
/* FAQ */
.faq{max-width:780px;margin:0 0 28px}
.faq-i{border:1px solid var(--line);border-radius:12px;background:var(--surface);margin:0 0 10px}
.faq-i summary{cursor:pointer;padding:16px 18px;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}
.faq-i summary::-webkit-details-marker{display:none}
.faq-i summary::after{content:"+";font:700 20px var(--mono);color:var(--accent)}
.faq-i[open] summary::after{content:"\2212"}
.faq-a{padding:0 18px 14px;color:var(--muted)}
.faq-a p{margin:0 0 10px}
.faq-more{max-width:780px}
.sitefoot .sf-in{display:grid;grid-template-columns:minmax(220px,300px) minmax(0,1fr);gap:24px 56px;justify-content:stretch}
.sitefoot .sf-brand{display:block;max-width:none}
.sitefoot .sf-brand b{margin:0 8px 0 6px}
.sitefoot .sf-brand .small{display:block;margin-top:4px}
.sf-cta{padding-bottom:10px}
@media(max-width:760px){.sitefoot .sf-in{grid-template-columns:1fr}}
.cs-tbl table{table-layout:fixed}.cs-tbl th:nth-child(1){width:56%}.cs-tbl th:nth-child(2){width:20%}@media(max-width:640px){.cs-tbl table{table-layout:auto}}

/* footer v2.1: roomier */
.sf-cta,.sitefoot .sf-in,.sitefoot .foot{max-width:1180px;padding-left:24px;padding-right:24px}
.sitefoot .sf-in{grid-template-columns:minmax(230px,1fr) auto;gap:28px 72px;padding-top:30px;padding-bottom:12px}
.sf-cols{grid-template-columns:repeat(4,auto);gap:0 52px}
.sf-cols a{white-space:nowrap;padding:5px 0}
.sf-cols h2{margin-bottom:12px}
.sf-cta{padding-top:34px;padding-bottom:18px}
.sitefoot .foot{padding-top:22px;padding-bottom:32px}
@media(max-width:900px){.sitefoot .sf-in{grid-template-columns:1fr}.sf-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 28px}.sf-cols a{white-space:normal}}

/* patch 22: skip link, top CTA, footer signup, launch pages */
.skip{position:absolute;left:12px;top:-60px;z-index:200;background:var(--accent);color:var(--accent-ink);padding:10px 16px;border-radius:0 0 10px 10px;font-weight:600;text-decoration:none}
.skip:focus{top:0}
main:focus{outline:none}
.sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.top-cta{padding:7px 14px;font-size:13px;margin-right:6px}
@media(max-width:1040px){.top-acct .top-cta{display:none}}
form.sf-news{display:flex;flex-direction:column;gap:6px;max-width:340px;margin:12px 0}
.sf-news-r{display:flex;gap:6px}.sf-news-r input{flex:1 1 auto;min-width:0}
.sf-news .tog{display:flex;gap:8px;align-items:flex-start;line-height:1.4}.sf-news .tog input{width:auto;margin-top:3px}
.hp{position:absolute!important;left:-9999px;width:1px;height:1px;opacity:0}
.lp-checks{list-style:none;margin:0;padding:0}.lp-checks li{display:flex;gap:10px;align-items:flex-start;padding:10px 0;border-bottom:1px solid var(--line)}
.lp-dot{flex:none;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:13px;font-weight:700}
.lp-dot.ok{background:var(--ok,#2DD4BF);color:#06222b}.lp-dot.no{background:var(--bad,#FF6B5E);color:#2b0a07}.lp-dot.na{background:var(--line);color:var(--fg)}
.lp-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.chk-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:8px;margin:8px 0}
.chk-grid label{display:flex;gap:8px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:10px}.chk-grid input{width:auto}
/* patch 22b: footer signup spacing, tidy mobile account block */
form.sf-news{margin:14px 0 18px}.sf-news>label:first-of-type{padding:0;margin:0}
.sf-follow{margin-top:6px}
@media(max-width:1040px){
 header.top nav.menu .menu-acct{margin-top:10px;padding-top:10px;border-top:1px solid var(--line)}
 header.top nav.menu .menu-acct a,header.top nav.menu .menu-acct .link{min-height:44px;font-size:15px;color:var(--fg)}
 header.top nav.menu .menu-acct .menu-adm{color:var(--muted)}
 header.top nav.menu .menu-acct a.menu-cta{margin:0 0 6px;color:var(--accent-ink)}
 header.top nav.menu .menu-acct .link{border:0;background:none;padding:0 4px;display:flex;align-items:center;cursor:pointer;font:inherit;font-size:15px}
}
form.sf-news{max-width:380px}.sf-news .sf-news-r .btn{white-space:nowrap;flex:none;padding-inline:18px}
form.sf-news label,form.sf-news .tog{padding-left:0!important;margin-left:0!important;text-indent:0}

/* Lessons as a grid: Watch / Read / Do / Check are the four columns, one row per lesson, a tick in each step that is done */
.lmx{display:grid;grid-template-columns:minmax(0,1fr) repeat(4,112px);align-items:center;column-gap:8px}
.lmh{padding:4px 0 10px;border-bottom:2px solid var(--line)}
.lmh b{display:flex;align-items:center;justify-content:center;gap:8px;font:700 14px var(--mono);letter-spacing:.07em;text-transform:uppercase;color:color-mix(in srgb,var(--sc) 78%,var(--fg))}
.lmh b svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}.lmh b i{font-style:normal}
.lmrow{padding:10px 0;border-bottom:1px solid var(--line)}.lmrow:last-child{border-bottom:0}
.lmt{display:flex;align-items:center;flex-wrap:wrap;gap:6px 12px;min-width:0}
.lmt .gt{font:700 18px var(--sans,inherit);color:var(--fg);min-width:0}
.lmt .gogo{flex:none;font:600 12px var(--sans,inherit);text-decoration:none;background:var(--accent);color:var(--accent-ink,#0E1B2C);padding:5px 12px;border-radius:999px}
.lmt .gogo:hover{filter:brightness(1.08)}
.lmc{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;min-height:56px;border-radius:10px;text-decoration:none;color:var(--fg);border:1px solid transparent;transition:background .12s,border-color .12s}
.lmc .dot{width:32px;height:32px;border:2px solid color-mix(in srgb,var(--sc) 55%,var(--line));font-size:17px}
.lmc .dot.on{background:var(--sc);border-color:var(--sc);color:#0E1B2C;font-weight:700}
.lmc .lbl{display:none;font:600 11px var(--mono);font-style:normal;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
a.lmc:hover{background:color-mix(in srgb,var(--sc) 12%,transparent);border-color:color-mix(in srgb,var(--sc) 45%,transparent)}
.lmc.lock{opacity:.45}.lmc.none{color:var(--muted);opacity:.5}
@media(max-width:640px){.lmx{grid-template-columns:repeat(4,minmax(0,1fr))}.lmh{display:none}.lmt{grid-column:1/-1;margin-bottom:8px}.lmc .lbl{display:block}}

/* Course intro: a button that opens the video in a popup */
.cin-btn{display:flex;align-items:center;gap:14px;width:100%;text-align:left;text-decoration:none;font:inherit;color:var(--fg);background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px 16px;cursor:pointer;transition:border-color .15s,background .15s}
.cin-btn:hover,.cin-btn:focus-visible{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,var(--surface))}
.cin-play{flex:none;display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--accent);color:var(--accent-ink,#0E1B2C)}
.cin-play svg{width:20px;height:20px;fill:currentColor;margin-left:2px}
.cin-t{display:flex;flex-direction:column;gap:2px;min-width:0}.cin-t b{font:700 16px var(--sans,inherit)}.cin-t small{color:var(--muted);font:400 13px var(--sans,inherit)}
.cin-btn.big{padding:22px 24px;gap:20px;border-radius:16px;background:radial-gradient(520px 160px at 0% 0%,rgba(45,212,191,.18),transparent 70%),radial-gradient(420px 160px at 100% 100%,rgba(139,124,246,.16),transparent 70%),var(--surface)}
.cin-btn.big .cin-play{width:68px;height:68px}.cin-btn.big .cin-play svg{width:28px;height:28px}
.cin-btn.big .cin-t b{font-size:22px}.cin-btn.big .cin-t small{font-size:15px}
.cin-slim{margin:14px 0 0}
dialog.cin-dlg{width:min(960px,94vw);padding:0;border:1px solid var(--line);border-radius:14px;background:#000;overflow:visible;color:#fff}
dialog.cin-dlg::backdrop{background:rgba(5,10,18,.78)}
.cin-stage{position:relative;padding-top:56.25%;border-radius:14px;overflow:hidden}.cin-stage iframe,.cin-stage video{position:absolute;inset:0;width:100%;height:100%;border:0;background:#000}
.cin-x{position:absolute;right:-6px;top:-46px;width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--fg);font:400 24px/1 var(--sans,inherit);cursor:pointer}
@media(max-width:560px){.cin-btn.big{padding:16px}.cin-btn.big .cin-play{width:52px;height:52px}.cin-btn.big .cin-t b{font-size:18px}.cin-x{right:0}}

/* long names: keep the account button a fixed maximum width and cut the name with an ellipsis */
.umenu{min-width:0}.umenu summary{max-width:150px}
.umenu summary .un{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.umenu summary svg{flex:none}
.umenu-p{max-width:min(260px,90vw)}
@media(min-width:1041px) and (max-width:1120px){nav.menu{gap:6px 16px;font-size:14px}.top-right{gap:6px}.lockname i{display:none}}

/* course page header: icon beside the title, track and labs as small tags (patch 23) */
.chead2{display:flex;gap:20px;align-items:flex-start;margin:6px 0 4px}
.ch-ico{box-sizing:border-box;flex:none;width:68px;height:68px;padding:12px;border-radius:50%;border:4px solid var(--tcc,var(--accent));background:#0E1B2C;color:var(--tcc,var(--accent))}
.ch-t{min-width:0;flex:1}.ch-t h1{margin:0 0 8px}.ch-t .lead{margin:0;max-width:62ch}
.ch-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin:2px 0 8px;font:600 12px var(--mono);letter-spacing:.14em;text-transform:uppercase}
.ch-meta .trk{color:var(--tcc,var(--accent));display:inline-flex;align-items:center;gap:8px}
.ch-meta .trk i{width:8px;height:8px;border-radius:50%;background:var(--tcc,var(--accent))}
.ch-chip{font:600 11px var(--mono);letter-spacing:.08em;padding:3px 10px;border-radius:999px;border:1px solid var(--line);color:var(--muted)}
@media(max-width:560px){.chead2{gap:14px}.ch-ico{width:54px;height:54px;padding:9px;border-width:3px}}

/* ---- course cards (patch 23): top accent, track label, plain footer; plus the Launching soon tile ---- */
.cgrid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;margin-top:22px;align-items:stretch}
.ccard{position:relative;display:flex;flex-direction:column;gap:10px;padding:22px 22px 20px;border-top:3px solid var(--tcc,var(--accent));min-height:280px}
.ccard::before{display:none}
.ccard:hover,.ccard:focus-within{transform:translateY(-3px);box-shadow:var(--shadow);border-color:color-mix(in srgb,var(--tcc,var(--accent)) 55%,var(--line))}
.cc-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.cc-track{font:600 12px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--tcc,var(--accent))}
.cc-ico{box-sizing:border-box;width:46px;height:46px;padding:8px;border-radius:50%;border:3px solid var(--tcc,var(--accent));background:#0E1B2C;color:var(--tcc,var(--accent));flex:none}
.cc-title{margin:2px 0 0;font-family:var(--sans);font-size:22px;line-height:1.2;letter-spacing:-.01em}
.cc-title a{color:inherit;text-decoration:none}
.cc-title a::after{content:"";position:absolute;inset:0}
.cc-sum{margin:0;color:var(--muted);font-size:15px}
.cc-meta{margin:0;font:500 12px var(--mono);color:var(--muted)}
.cc-foot{margin-top:auto;padding-top:14px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px}
.cc-price{font:700 17px var(--mono)}.cc-price.free{color:var(--tcc,var(--accent))}
.cc-go{white-space:nowrap;font:600 14px var(--sans);color:var(--accent);text-decoration:none;position:relative;z-index:1}
.cc-go:hover{text-decoration:underline}
.soontile{box-sizing:border-box;display:flex;flex-direction:column;justify-content:center;gap:8px;min-height:280px;padding:22px;border:1px dashed color-mix(in srgb,var(--muted) 55%,var(--line));border-radius:14px}
.soontile .label{margin:0 0 4px;color:var(--amber,#FFB547)}
.soontile .label::before{display:none}
.soontile .st-h{margin:0;font-family:var(--sans);font-size:22px;line-height:1.2}
.soontile .lrow{margin:2px 0;font-size:18px}
.soontile .rel{font:500 13px var(--mono);color:var(--muted);margin-left:6px}
.soontile .small{margin:0;color:var(--muted)}
.soontile .cc-go{margin-top:6px;align-self:flex-start;white-space:normal}
#cgrid .ccard[hidden]{display:none}
@media(max-width:640px){.cgrid{grid-template-columns:minmax(0,1fr)}.ccard,.soontile{min-height:0}}
@media(prefers-reduced-motion:reduce){.ccard:hover{transform:none}}


/* soon notice on the course page */
.soonnote .label{color:var(--amber,#FFB547);margin:0 0 6px}

/* planned (coming soon) cards */
.ccard.planned{min-height:260px}
.cc-tag{font:500 12px var(--mono);padding:4px 12px;border:1px dashed color-mix(in srgb,var(--muted) 60%,var(--line));border-radius:8px;color:var(--muted);white-space:nowrap}
.ccard.planned .cc-title{margin-top:6px}
.ccard.planned .cc-go{color:var(--accent)}