/* ==========================================================================
   AI Study Group · the academy
   Same universe as the portfolio (v3): Geist Mono, Instrument Serif italic accents,
   monochrome, hairlines, glass cards. Green only where it means something:
   progress, XP, success.
   ========================================================================== */

:root{
  --bg:#0F0F11; --bg-2:#17171B; --bg-3:#1E1E23; --ink:#F2F1EB; --dim:#A3A198; --faint:#6A6962;
  --line:rgba(242,241,235,.09); --line-2:rgba(242,241,235,.18); --live:#7BD88F; --warn:#E8B86B; --bad:#E58A7B;
  --card:rgba(15,15,17,.86); --glass:rgba(15,15,17,.62);
  --mono:"Geist Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --serif:"Instrument Serif","Iowan Old Style","Times New Roman",serif;
  --ease:cubic-bezier(.16,.8,.2,1);
  --top:64px; --gut:clamp(16px,4vw,56px); --maxw:1240px;
  color-scheme:dark;
}
:root[data-theme="light"]{
  --bg:#F1EFE8; --bg-2:#E8E5DC; --bg-3:#DEDBD1; --ink:#131313; --dim:#55534D; --faint:#8A877E;
  --line:rgba(19,19,19,.10); --line-2:rgba(19,19,19,.22); --live:#1E8A3C; --warn:#9A6A12; --bad:#B0412E;
  --card:rgba(241,239,232,.9); --glass:rgba(241,239,232,.66);
  color-scheme:light;
}

*{box-sizing:border-box}
html{background:var(--bg);-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--top) + 16px)}
body{margin:0;min-height:100vh;background:var(--bg);color:var(--ink);font-family:var(--mono);font-size:15px;line-height:1.65;-webkit-font-smoothing:antialiased;transition:background-color .5s,color .5s;overflow-x:hidden}
a{color:inherit}
button,input,textarea{font:inherit;color:inherit}
img{max-width:100%;height:auto;display:block}
::selection{background:var(--ink);color:var(--bg)}
:focus-visible{outline:1px solid var(--ink);outline-offset:3px}
.it{font-family:var(--serif);font-style:italic;font-weight:400;letter-spacing:-.01em}
.mono{font-family:var(--mono)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.dim{color:var(--dim)}
.sm{font-size:12.5px}
.live-t{color:var(--live)}
.err-t{color:var(--bad)}
.ic{width:1.05em;height:1.05em;flex:0 0 auto;vertical-align:-.16em}
.skip{position:fixed;left:12px;top:-60px;z-index:100;background:var(--ink);color:var(--bg);padding:8px 14px;border-radius:999px;font-size:13px;text-decoration:none;transition:top .2s}
.skip:focus{top:12px}

/* ---------- background ---------- */
#ribbon{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:0;opacity:var(--ribbon-o,.45);transition:opacity 1.2s var(--ease);-webkit-mask-image:linear-gradient(to bottom,transparent 0,rgba(0,0,0,.25) 50px,#000 140px);mask-image:linear-gradient(to bottom,transparent 0,rgba(0,0,0,.25) 50px,#000 140px)}
.dots{position:fixed;inset:0;z-index:0;pointer-events:none;background:radial-gradient(circle,color-mix(in srgb,var(--ink) 16%,transparent) 1px,transparent 1.6px) 0 0/15px 15px;-webkit-mask-image:radial-gradient(ellipse 70% 60% at 100% 0%,#000,transparent 70%);mask-image:radial-gradient(ellipse 70% 60% at 100% 0%,#000,transparent 70%);opacity:.8}
.grain{position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.045;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E")}
.read-bar{position:fixed;left:0;right:0;top:var(--top);height:2px;z-index:41;pointer-events:none}
.read-bar i{display:block;height:100%;width:0;background:var(--live);transition:width .2s linear}
body:not([data-route="learn"]) .read-bar{display:none}

/* ---------- top bar ---------- */
.top{position:fixed;z-index:40;left:0;right:0;top:0;height:var(--top);display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 var(--gut);background:color-mix(in srgb,var(--bg) 70%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid transparent;transition:border-color .3s,background-color .5s}
body.scrolled .top{border-bottom-color:var(--line)}
.mark{display:flex;align-items:center;gap:11px;text-decoration:none;font-size:12.5px;letter-spacing:.06em;color:var(--ink);min-width:0}
.mark-t{white-space:nowrap}
.logo{width:30px;height:30px;color:var(--ink);flex:0 0 auto}
.logo .here{fill:var(--live)}
.top-nav{display:flex;align-items:center;gap:4px;margin-left:auto;margin-right:6px}
.top-nav a{font-size:12.5px;color:var(--faint);text-decoration:none;padding:6px 10px;border-radius:999px;letter-spacing:.03em;transition:color .2s,background .2s}
.top-nav a:hover,.top-nav a:focus-visible{color:var(--ink);background:color-mix(in srgb,var(--ink) 6%,transparent);outline:none}
.top-nav a.on{color:var(--ink)}
.top-r{display:flex;align-items:center;gap:10px}
.chip-btn{background:none;border:1px solid var(--line-2);border-radius:999px;padding:5px 12px;font-size:12px;color:var(--dim);cursor:pointer;text-decoration:none;transition:color .2s,border-color .2s,background .2s;display:inline-flex;align-items:center;gap:6px}
.chip-btn:hover,.chip-btn:focus-visible{color:var(--ink);border-color:var(--ink);outline:none}
.me-chip{display:flex;align-items:center;gap:10px;height:34px;padding:0 12px 0 5px;border:1px solid var(--line-2);border-radius:999px;text-decoration:none;font-size:12px;color:var(--dim);background:color-mix(in srgb,var(--bg) 60%,transparent);transition:border-color .25s,color .25s,transform .3s var(--ease)}
.me-chip:hover,.me-chip:focus-visible{border-color:var(--ink);color:var(--ink);outline:none}
.me-chip .lv{display:grid;place-items:center;height:24px;min-width:24px;padding:0 6px;border-radius:999px;background:var(--ink);color:var(--bg);font-size:11px;font-weight:500;font-variant-numeric:tabular-nums}
.me-chip .xp-mini{display:grid;grid-template-columns:auto auto;align-items:baseline;column-gap:4px;row-gap:2px;line-height:1}
.me-chip .xpv{color:var(--ink);font-variant-numeric:tabular-nums;font-size:12.5px}
.me-chip .u{font-size:10px;color:var(--faint)}
.me-chip .bar{grid-column:1/-1;height:2px;background:var(--line-2);border-radius:2px;overflow:hidden;width:100%;min-width:36px}
.me-chip .bar i{display:block;height:100%;width:0;background:var(--live);transition:width 1s var(--ease)}
.me-chip .fl{display:flex;align-items:center;gap:2px;color:var(--faint)}
.me-chip .fl b{font-weight:400;font-size:11px;font-variant-numeric:tabular-nums}
.me-chip .fl.lit{color:var(--live)}
.me-chip.tick{border-color:var(--live);transform:scale(1.04)}
.me-chip.tick .xpv{color:var(--live)}

/* ---------- layout ---------- */
.app{position:relative;z-index:2;padding:calc(var(--top) + clamp(24px,5vw,56px)) var(--gut) 80px;min-height:100vh;outline:none}
.view{max-width:var(--maxw);margin:0 auto}
.view.narrow{max-width:760px}
@media (prefers-reduced-motion:no-preference){
  .app .view{transition:opacity .5s ease,transform .7s var(--ease)}
  .app:not(.in) .view{opacity:0;transform:translateY(14px)}
  .js .rv{opacity:0;transform:translateY(28px);transition:opacity .9s ease,transform 1.1s var(--ease)}
  .js .rv.in{opacity:1;transform:none}
}
.boot{display:flex;align-items:center;gap:12px;justify-content:center;padding:18vh 0;color:var(--faint);font-size:12.5px}

/* ---------- type ---------- */
h1{font-weight:300;font-size:clamp(44px,8.4vw,118px);line-height:.92;letter-spacing:-.055em;margin:0 0 24px}
h1 > span{display:block}
h2{font-weight:300;font-size:clamp(28px,4.6vw,56px);line-height:1.02;letter-spacing:-.045em;margin:0 0 16px;max-width:20ch;text-wrap:balance}
h2 .it,h1 .it{font-size:1.06em}
h3{font-weight:400;font-size:19px;letter-spacing:-.02em;margin:0}
.h-sm{font-size:clamp(20px,2.4vw,26px);letter-spacing:-.03em;margin:0 0 14px;max-width:none}
.lede{color:var(--dim);max-width:62ch;margin:0 0 22px;font-size:15px}
.lede.big{color:var(--ink);font-size:clamp(17px,1.8vw,21px);line-height:1.45;max-width:38ch;margin-bottom:14px}
.kicker{font-size:12px;color:var(--dim);letter-spacing:.06em;margin-bottom:16px;display:flex;flex-wrap:wrap;align-items:center;gap:4px 6px}
.kicker b{color:var(--live);font-weight:400}
.kicker a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line-2);display:inline-flex;align-items:center;gap:4px}
.kicker a:hover{border-color:var(--ink)}
.k{font-size:11px;color:var(--faint);letter-spacing:.1em;text-transform:lowercase;margin-bottom:8px}
.k.live{color:var(--live)}
.label{font-size:11.5px;color:var(--faint);letter-spacing:.1em;margin:0 0 20px;display:flex;align-items:center;gap:12px;text-transform:lowercase}
.label::after{content:"";flex:1;height:1px;background:var(--line)}
.sec{padding-top:clamp(64px,9vw,120px)}
.sec-s{padding-top:clamp(40px,6vw,64px)}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.tag{font-size:11px;border:1px solid var(--line-2);color:var(--dim);padding:2px 9px;border-radius:999px;white-space:nowrap}
.pill{font-size:11px;border:1px solid var(--line-2);color:var(--dim);padding:2px 10px;border-radius:999px}
.pill.live{border-color:color-mix(in srgb,var(--live) 55%,transparent);color:var(--live)}
.note{font-size:13px;color:var(--dim);border-left:1px solid var(--line-2);padding-left:12px;margin:14px 0}
.note a,.dim a,.lede a,.faq a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line-2)}
.note a:hover,.dim a:hover,.lede a:hover,.faq a:hover{border-color:var(--ink)}
.warn{font-size:12.5px;color:var(--dim);display:flex;gap:8px;align-items:flex-start;margin:10px 0}
.warn .ic{margin-top:3px}
.err{font-size:13px;color:var(--bad);margin:8px 0;min-height:0}
.err:empty{display:none}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;font-size:13px;text-decoration:none;border:1px solid var(--line-2);background:transparent;padding:10px 18px;border-radius:999px;cursor:pointer;transition:background .25s,color .25s,border-color .25s,opacity .25s;white-space:nowrap;line-height:1.3}
.btn:hover,.btn:focus-visible{background:var(--ink);color:var(--bg);border-color:var(--ink);outline:none}
.btn.solid{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.btn.solid:hover,.btn.solid:focus-visible{background:transparent;color:var(--ink)}
.btn.live{border-color:color-mix(in srgb,var(--live) 60%,transparent);color:var(--live)}
.btn.live:hover,.btn.live:focus-visible{background:var(--live);color:var(--bg);border-color:var(--live)}
.btn.sm{font-size:12px;padding:7px 13px}
.btn.wide{width:100%}
.btn:disabled{opacity:.42;cursor:not-allowed}
.btn:disabled:hover{background:transparent;color:inherit;border-color:var(--line-2)}
.btn.solid:disabled:hover{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.lnk{background:none;border:0;padding:0;cursor:pointer;font-size:12.5px;color:var(--dim);text-decoration:none;border-bottom:1px solid var(--line-2)}
.lnk:hover,.lnk:focus-visible{color:var(--ink);border-color:var(--ink);outline:none}
.lnk.danger{color:var(--bad);border-color:color-mix(in srgb,var(--bad) 40%,transparent)}
.cta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:22px}
.cta.center{justify-content:center}
.resume{font-size:12.5px;color:var(--faint);margin:14px 0 0}
.resume a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line-2)}
.spinner{display:inline-block;width:18px;height:18px;border:1.5px solid var(--line-2);border-top-color:var(--ink);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* bars */
.xp-bar,.bar,.mini-bar,.ph-bar{display:block;height:4px;border-radius:4px;background:var(--line-2);overflow:hidden}
.xp-bar i,.bar i,.mini-bar i,.ph-bar i{display:block;height:100%;width:0;background:var(--live);border-radius:4px;transition:width 1.4s var(--ease)}
.xp-bar.big{height:8px}
.xp-row{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:var(--faint);margin-bottom:8px;flex-wrap:wrap}
.xp-row b{color:var(--ink);font-weight:400}

/* viewfinder brackets (from the portfolio) */
.vf{position:relative}
.vf::before,.vf::after{content:"";position:absolute;inset:-8px;pointer-events:none;z-index:3;opacity:.7;
  background:linear-gradient(var(--ink),var(--ink)) top left/14px 1px no-repeat,linear-gradient(var(--ink),var(--ink)) top left/1px 14px no-repeat,linear-gradient(var(--ink),var(--ink)) top right/14px 1px no-repeat,linear-gradient(var(--ink),var(--ink)) top right/1px 14px no-repeat}
.vf::after{background:linear-gradient(var(--ink),var(--ink)) bottom left/14px 1px no-repeat,linear-gradient(var(--ink),var(--ink)) bottom left/1px 14px no-repeat,linear-gradient(var(--ink),var(--ink)) bottom right/14px 1px no-repeat,linear-gradient(var(--ink),var(--ink)) bottom right/1px 14px no-repeat}

/* ============================== home ============================== */
.hero{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:clamp(28px,5vw,72px);align-items:center;min-height:calc(100vh - var(--top) - 120px)}
.hero > *{min-width:0}
.hero h1{font-size:clamp(52px,9vw,128px)}
.hero-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--line);margin-top:34px;max-width:560px}
.hero-stats div{padding:14px 12px 0 0}
.hero-stats b{display:block;font-weight:300;font-size:clamp(22px,2.6vw,32px);letter-spacing:-.04em;line-height:1;font-variant-numeric:tabular-nums}
.hero-stats span{display:block;font-size:11.5px;color:var(--faint);margin-top:6px}
.desk{position:relative;padding:10px 0 60px}
.desk-cert{transform:rotate(-2.4deg);box-shadow:0 40px 90px -40px rgba(0,0,0,.75);border-radius:10px}
.desk-cert img{width:100%;height:auto;border-radius:10px;border:1px solid var(--line-2)}
.desk-card{position:absolute;left:-18px;bottom:0;width:min(330px,82%);display:block;text-decoration:none;padding:16px 18px;border:1px solid var(--line-2);border-radius:16px;background:var(--glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 30px 70px -30px rgba(0,0,0,.6);transform:rotate(1.2deg);transition:transform .5s var(--ease),border-color .3s}
.desk-card:hover{transform:rotate(0) translateY(-3px);border-color:var(--ink)}
.desk-lv{font-size:20px;letter-spacing:-.02em;margin-bottom:10px}
.desk-lv .it{font-size:1.15em}
.desk-row{display:flex;justify-content:space-between;gap:10px;font-size:11.5px;color:var(--faint);margin-top:9px;flex-wrap:wrap}
.fl{display:inline-flex;align-items:center;gap:5px}
.fl.lit{color:var(--live)}
.path{list-style:none;margin:30px 0 0;padding:0;display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:0;border-top:1px solid var(--line);position:relative}
.path::before{content:"";position:absolute;left:0;top:-1px;height:1px;width:18%;background:var(--live);animation:walk 7s cubic-bezier(.6,0,.4,1) infinite}
@keyframes walk{0%{left:0;opacity:0}8%{opacity:1}85%{opacity:1}100%{left:82%;opacity:0}}
.path li{padding:18px 16px 0 0;border-right:1px solid var(--line);min-width:0}
.path li:last-child{border-right:0}
.path li + li{padding-left:16px}
.path b{display:block;font-size:11px;color:var(--live);font-weight:400;letter-spacing:.08em;margin-bottom:10px}
.path strong{display:block;font-weight:400;font-size:16px;letter-spacing:-.01em;margin-bottom:6px}
.path p{margin:0;color:var(--dim);font-size:12.5px;line-height:1.55}
.tgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:30px}
.tcard{border:1px solid var(--line-2);border-radius:18px;padding:24px 22px;background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);display:flex;flex-direction:column;gap:12px;min-width:0;position:relative;overflow:hidden}
.tcard.open::after{content:"";position:absolute;right:-40px;top:-40px;width:220px;height:220px;background:radial-gradient(circle,color-mix(in srgb,var(--ink) 16%,transparent) 1px,transparent 1.5px) 0 0/9px 9px;-webkit-mask-image:radial-gradient(circle,#000,transparent 70%);mask-image:radial-gradient(circle,#000,transparent 70%);pointer-events:none}
.tcard.soon{background:color-mix(in srgb,var(--bg) 50%,transparent);border-style:dashed}
.tc-top{display:flex;justify-content:space-between;align-items:center}
.tc-top .code{font-size:12px;color:var(--live);letter-spacing:.08em}
.tcard.soon .code{color:var(--faint)}
.tcard h3{font-weight:300;font-size:clamp(24px,2.6vw,32px);letter-spacing:-.04em;line-height:1.05}
.tcard p{margin:0;color:var(--dim);font-size:13.5px}
.tc-meta{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:12px;color:var(--faint)}
.tc-prog{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:center;font-size:12px;color:var(--dim)}
.tcard .btn{align-self:flex-start;margin-top:auto}
.outline{list-style:none;margin:4px 0 0;padding:0;border-top:1px solid var(--line)}
.outline li{display:grid;grid-template-columns:38px minmax(0,1fr);gap:8px;padding:9px 0;border-bottom:1px solid var(--line);font-size:12.5px}
.outline b{font-weight:400;color:var(--faint);font-variant-numeric:tabular-nums}
.outline strong{display:block;font-weight:400}
.outline span{display:block;color:var(--faint);font-size:12px}
.tcard .lnk{align-self:flex-start;margin-top:auto}
.tc-pills{display:flex;gap:6px}
.pill.new{border-color:var(--ink);color:var(--ink)}
.tgrid.n3{grid-template-columns:repeat(3,minmax(0,1fr))}
/* the school map: faculties, each a list of track rows */
.school-md p{margin:0 0 12px}
.schools{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:30px;align-items:start}
.school{border:1px solid var(--line-2);border-radius:18px;background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);display:flex;flex-direction:column;min-width:0;overflow:hidden}
.sc-h{padding:20px 20px 14px}
.sc-h .k{margin-bottom:6px}
.sc-h h3{font-family:var(--serif);font-style:italic;font-weight:400;font-size:32px;letter-spacing:-.01em;line-height:1;margin-bottom:8px}
.sc-h p{margin:0;color:var(--dim);font-size:12.5px;line-height:1.55}
.sc-list{border-top:1px solid var(--line);display:flex;flex-direction:column}
.sc-list.wide{border:1px solid var(--line);border-radius:16px;overflow:hidden;max-width:880px}
.trow{display:grid;grid-template-columns:34px minmax(0,1fr) auto;gap:10px;align-items:center;padding:12px 20px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink);transition:background .2s}
.trow:last-child{border-bottom:0}
.trow:hover,.trow:focus-visible{background:color-mix(in srgb,var(--ink) 6%,transparent);outline:none}
.trow b{font-weight:400;font-size:11.5px;letter-spacing:.06em;color:var(--live);font-variant-numeric:tabular-nums}
.trow.soon b{color:var(--faint)}
.tr-t{min-width:0}
.tr-t strong{display:block;font-weight:400;font-size:14px;letter-spacing:-.01em;line-height:1.35}
.tr-t small{display:block;font-size:11.5px;color:var(--faint);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.trow.soon strong{color:var(--dim)}
.trow em{font-style:normal;font-size:11px;color:var(--faint);border:1px dashed var(--line-2);border-radius:999px;padding:1px 9px;white-space:nowrap;display:inline-flex;gap:6px;align-items:center}
.trow.open em{border-style:solid;border-color:color-mix(in srgb,var(--live) 55%,transparent);color:var(--live)}
.trow em i{font-style:normal;color:var(--ink)}
/* learning paths */
.paths{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:30px}
.pcard{border:1px solid var(--line-2);border-radius:18px;padding:22px 20px;background:color-mix(in srgb,var(--bg) 60%,transparent);display:flex;flex-direction:column;gap:10px;min-width:0}
.pcard h3{font-weight:300;font-size:clamp(22px,2.2vw,28px);letter-spacing:-.04em;line-height:1.05}
.pcard p{margin:0;color:var(--dim);font-size:13px}
.pchain{list-style:none;margin:6px 0 0;padding:0;display:flex;flex-direction:column;gap:0;position:relative}
.pchain li{position:relative;padding-left:18px}
.pchain li::before{content:"";position:absolute;left:4px;top:0;bottom:0;width:1px;background:var(--line-2)}
.pchain li:first-child::before{top:50%}
.pchain li:last-child::before{bottom:50%}
.pchain li::after{content:"";position:absolute;left:1px;top:50%;width:7px;height:7px;margin-top:-3.5px;border-radius:50%;background:var(--bg);border:1px solid var(--line-2)}
.pchain li:has(a.open)::after{background:var(--live);border-color:var(--live)}
.pchain a{display:grid;grid-template-columns:30px minmax(0,1fr);gap:8px;align-items:baseline;padding:6px 8px;border-radius:9px;text-decoration:none;font-size:13px;color:var(--dim);transition:background .2s,color .2s}
.pchain a:hover,.pchain a:focus-visible{background:color-mix(in srgb,var(--ink) 6%,transparent);color:var(--ink);outline:none}
.pchain a.open{color:var(--ink)}
.pchain b{font-weight:400;font-size:11px;color:var(--faint);letter-spacing:.06em}
.pchain a.open b{color:var(--live)}
.pc-meta{margin-top:auto;padding-top:8px;font-size:11.5px;color:var(--faint);border-top:1px solid var(--line)}
/* free resources on "soon" track pages */
.reading{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;max-width:980px}
.rd{display:flex;flex-direction:column;gap:3px;border:1px solid var(--line);border-radius:14px;padding:14px 16px;text-decoration:none;color:var(--ink);background:color-mix(in srgb,var(--bg) 70%,transparent);transition:border-color .2s,background .2s;min-width:0}
.rd:hover,.rd:focus-visible{border-color:var(--ink);outline:none}
.rd strong{font-weight:400;font-size:14px;letter-spacing:-.01em}
.rd small{font-size:11.5px;color:var(--faint)}
.rd span{font-size:12.5px;color:var(--dim);line-height:1.5}
.modes.n4{grid-template-columns:repeat(4,minmax(0,1fr))}
/* skills map: each production skill and where the school teaches it */
.sk-count{font-size:12.5px;color:var(--faint);margin:0}
.sk-count b{color:var(--live);font-weight:400;font-size:20px;letter-spacing:-.02em;margin-right:4px}
.skills{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:26px;align-items:start}
.sk-group{border:1px solid var(--line-2);border-radius:18px;padding:18px 18px 6px;background:color-mix(in srgb,var(--bg) 60%,transparent);min-width:0}
.sk-group h3{font-family:var(--serif);font-style:italic;font-weight:400;font-size:26px;letter-spacing:-.01em;line-height:1.05;margin-bottom:10px}
.sk-group ul{list-style:none;margin:0;padding:0}
.sk-group li{display:flex;flex-direction:column;gap:6px;padding:10px 0 10px 18px;border-top:1px solid var(--line);position:relative;font-size:13px;line-height:1.5;color:var(--dim)}
.sk-group li::before{content:"";position:absolute;left:0;top:16px;width:7px;height:7px;border-radius:50%;border:1px solid var(--line-2)}
.sk-group li.on{color:var(--ink)}
.sk-group li.on::before{background:var(--live);border-color:var(--live)}
.sk-at{display:flex;flex-wrap:wrap;gap:5px}
.sk-at a{font-size:10.5px;letter-spacing:.06em;border:1px dashed var(--line-2);border-radius:999px;padding:1px 8px;color:var(--faint);text-decoration:none;transition:color .2s,border-color .2s}
.sk-at a.open{border-style:solid;border-color:color-mix(in srgb,var(--live) 55%,transparent);color:var(--live)}
.sk-at a:hover,.sk-at a:focus-visible{color:var(--ink);border-color:var(--ink);outline:none}
.sk-credit{font-size:12px;color:var(--faint);margin:18px 0 0}
.sk-credit a{color:var(--dim);text-decoration:none;border-bottom:1px solid var(--line-2)}
.xp-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(20px,4vw,56px);margin-top:26px;align-items:start}
.earn{border-top:1px solid var(--line)}
.earn .k{margin:14px 0 6px}
.earn-r{display:flex;justify-content:space-between;gap:14px;padding:9px 0;border-bottom:1px solid var(--line);font-size:13px;color:var(--dim)}
.earn-r b{color:var(--ink);font-weight:400;white-space:nowrap;font-variant-numeric:tabular-nums}
.ladder{list-style:none;margin:0;padding:0;position:relative;border-left:1px solid var(--line-2)}
.ladder li{display:grid;grid-template-columns:34px minmax(0,1fr) auto;gap:4px 12px;align-items:baseline;padding:9px 0 9px 18px;position:relative;font-size:13px;color:var(--faint)}
.ladder li::before{content:"";position:absolute;left:-4px;top:15px;width:7px;height:7px;border-radius:50%;background:var(--bg);border:1px solid var(--line-2)}
.ladder li b{font-weight:400;font-variant-numeric:tabular-nums}
.ladder li strong{font-weight:400;color:var(--dim)}
.ladder li span{font-size:11.5px;text-align:right;font-variant-numeric:tabular-nums}
.ladder li em{grid-column:2/-1;font-style:normal;font-size:11px;color:var(--live);letter-spacing:.06em}
.ladder li.past::before{background:var(--live);border-color:var(--live)}
.ladder li.past strong{color:var(--ink)}
.ladder li.now{color:var(--ink)}
.ladder li.now::before{background:var(--live);border-color:var(--live);box-shadow:0 0 0 4px color-mix(in srgb,var(--live) 22%,transparent)}
.ladder li.now strong{color:var(--ink);font-family:var(--serif);font-style:italic;font-size:19px}
.ladder.compact li{padding:6px 0 6px 16px;font-size:12.5px}
.ladder.compact li::before{top:12px}
.tiers{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:26px}
.tier{border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--glass);min-width:0}
.tier-art{aspect-ratio:16/9;background:var(--bg-2);border-bottom:1px solid var(--line)}
.tier-art img{width:100%;height:100%;object-fit:cover}
.tier-b{padding:16px 18px 18px}
.tier-b h3{font-family:var(--serif);font-style:italic;font-size:28px;margin-bottom:6px}
.tier-b p{margin:0;color:var(--dim);font-size:13px}
.modes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:16px;overflow:hidden;margin-top:26px}
.modes > div{background:color-mix(in srgb,var(--bg) 88%,transparent);padding:22px 20px;min-width:0}
.modes h3{margin-bottom:8px}
.modes p{margin:0;color:var(--dim);font-size:13px}
.faq{border-top:1px solid var(--line);margin-top:26px;max-width:880px}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:16px 36px 16px 0;position:relative;font-size:15px;letter-spacing:-.01em}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:13px;font-size:20px;color:var(--faint);transition:transform .3s var(--ease)}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq summary:hover{color:var(--ink)}
.faq p{margin:0 0 18px;color:var(--dim);font-size:13.5px;max-width:70ch}
.foot{margin-top:clamp(70px,10vw,120px);padding-top:16px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;font-size:11.5px;color:var(--faint)}
.foot a{color:var(--dim);text-decoration:none}
.foot a:hover{color:var(--ink)}

/* ============================== track ============================== */
.back{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;color:var(--dim);text-decoration:none;margin-bottom:26px}
.back:hover{color:var(--ink)}
.t-hero{max-width:900px;padding-bottom:clamp(24px,4vw,44px)}
.t-title{font-size:clamp(38px,6.4vw,84px);line-height:.96;letter-spacing:-.05em;margin-bottom:18px}
.t-hero .lede{font-size:15.5px}
.t-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:clamp(20px,3.5vw,48px);align-items:start;border-top:1px solid var(--line);padding-top:clamp(24px,4vw,40px)}
.t-grid > *{min-width:0}
.t-side{position:sticky;top:calc(var(--top) + 20px);display:flex;flex-direction:column;gap:14px}
.t-learn{margin-bottom:36px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.lchip{font-size:12.5px;border:1px solid var(--line-2);background:color-mix(in srgb,var(--bg) 70%,transparent);padding:6px 12px;border-radius:10px;color:var(--ink);line-height:1.4}
.facts{border:1px solid var(--line-2);border-radius:16px;padding:6px 16px;background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.fact{display:grid;grid-template-columns:28px minmax(0,1fr);gap:10px;align-items:center;padding:12px 0;border-bottom:1px solid var(--line)}
.fact:last-child{border-bottom:0}
.f-ic{color:var(--faint);display:grid;place-items:center}
.f-ic .ic{width:18px;height:18px}
.fact span:not(.f-ic){display:block;font-size:11px;color:var(--faint);letter-spacing:.04em}
.fact b{font-weight:400;font-size:13px}
.prereq{padding:12px 0 8px;font-size:12.5px;border-top:1px solid var(--line)}
.prereq > span{font-size:11px;color:var(--faint);letter-spacing:.04em}
.prereq ul{margin:6px 0 0;padding-left:16px;color:var(--dim)}
.side-certs{border:1px solid var(--line);border-radius:16px;padding:14px 14px 8px;background:color-mix(in srgb,var(--bg) 70%,transparent)}
.scert{display:grid;grid-template-columns:30px minmax(0,1fr);gap:10px;align-items:center;padding:9px 6px;border-radius:10px;text-decoration:none;color:var(--faint);transition:background .2s}
.scert:hover{background:color-mix(in srgb,var(--ink) 5%,transparent)}
.scert b{display:block;font-weight:400;color:var(--dim);font-family:var(--serif);font-style:italic;font-size:18px;line-height:1.1}
.scert small{font-size:11.5px}
.sc-ic{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;border:1px solid var(--line-2)}
.scert.got b{color:var(--ink)}
.scert.got .sc-ic{background:var(--live);border-color:var(--live);color:var(--bg)}
.scert.ready .sc-ic{border-color:var(--live);color:var(--live)}
.scert.ready small{color:var(--live)}
.syl-h{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.syl-h .h-sm{margin:0}
.syllabus{display:flex;flex-direction:column}
.phase{border:1px solid var(--line-2);border-radius:18px;background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);overflow:hidden}
.phase.st-soon{border-style:dashed;background:color-mix(in srgb,var(--bg) 45%,transparent)}
.ph-head{width:100%;display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"k chev" "t chev" "c chev" "s chev" "bar bar";gap:2px 16px;text-align:left;background:none;border:0;padding:20px 22px;cursor:pointer;position:relative;overflow:hidden}
.ph-head.static{cursor:default}
.ph-head::after{content:"";position:absolute;right:0;top:0;bottom:0;width:46%;background:radial-gradient(circle,color-mix(in srgb,var(--ink) 20%,transparent) 1px,transparent 1.5px) 0 0/10px 10px;-webkit-mask-image:linear-gradient(to left,#000,transparent);mask-image:linear-gradient(to left,#000,transparent);opacity:.6;pointer-events:none}
.ph-k{grid-area:k;font-size:11px;color:var(--faint);letter-spacing:.12em;text-transform:uppercase}
.ph-t{grid-area:t;font-weight:300;font-size:clamp(22px,2.6vw,30px);letter-spacing:-.04em;line-height:1.15}
.ph-c{grid-area:c;font-size:12.5px;color:var(--dim)}
.ph-s{grid-area:s;font-size:12px;color:var(--faint);margin-top:6px;display:inline-flex;align-items:center;gap:6px}
.phase.st-done .ph-s{color:var(--live)}
.ph-bar{grid-area:bar;margin-top:12px;max-width:320px}
.ph-chev{grid-area:chev;align-self:center;width:34px;height:34px;border:1px solid var(--line-2);border-radius:50%;position:relative;z-index:1;background:var(--bg)}
.ph-chev::before{content:"";position:absolute;left:50%;top:45%;width:8px;height:8px;border-right:1px solid var(--ink);border-bottom:1px solid var(--ink);transform:translate(-50%,-50%) rotate(45deg);transition:transform .3s var(--ease)}
.ph-head[aria-expanded="true"] .ph-chev::before{transform:translate(-50%,-20%) rotate(-135deg)}
.ph-body{padding:0 22px 22px;border-top:1px solid var(--line)}
.ph-sum{color:var(--dim);font-size:13.5px;margin:16px 0 4px;max-width:70ch}
.ph-soon,.ph-cap{font-size:13px;color:var(--dim);border-left:1px solid var(--line-2);padding-left:12px;margin:14px 0}
.ph-cap b{color:var(--ink);font-weight:500}
.units{display:flex;flex-direction:column;gap:10px;margin-top:16px}
.unit{border:1px solid var(--line);border-radius:14px;padding:14px 14px 8px;background:color-mix(in srgb,var(--bg) 55%,transparent)}
.u-h{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:10px;align-items:baseline}
.u-n{font-size:11px;color:var(--faint);letter-spacing:.08em;white-space:nowrap}
.u-t{font-size:15px;letter-spacing:-.01em}
.u-p{font-size:11.5px;color:var(--faint);font-variant-numeric:tabular-nums}
.u-sum{margin:4px 0 6px;color:var(--faint);font-size:12.5px}
.lessons{list-style:none;margin:6px 0 0;padding:0}
.ls{display:grid;grid-template-columns:22px 38px minmax(0,1fr) auto;gap:8px;align-items:center;padding:8px 8px;margin:0 -8px;border-radius:9px;text-decoration:none;font-size:13.5px;color:var(--dim);transition:background .2s,color .2s}
a.ls:hover,a.ls:focus-visible{background:color-mix(in srgb,var(--ink) 6%,transparent);color:var(--ink);outline:none}
.ls-ic{display:grid;place-items:center;color:var(--faint)}
.ls-n{font-size:12px;color:var(--faint);font-variant-numeric:tabular-nums}
.ls-t{min-width:0;overflow-wrap:anywhere}
.ls-m{font-size:11.5px;color:var(--faint);white-space:nowrap}
.ls.done{color:var(--ink)}
.ls.done .ls-ic{color:var(--live)}
.ls.cur{color:var(--ink);background:color-mix(in srgb,var(--live) 9%,transparent)}
.ls.cur .ls-ic,.ls.cur .ls-m{color:var(--live)}
.ls.locked,.ls.soon{opacity:.6}
.qblock{display:grid;grid-template-columns:46px minmax(0,1fr) auto;gap:14px;align-items:center;margin-top:18px;padding:16px;border:1px dashed var(--line-2);border-radius:14px}
.qblock.passed{border-style:solid;border-color:color-mix(in srgb,var(--live) 40%,transparent)}
.qb-ic{width:46px;height:46px;border-radius:50%;border:1px solid var(--line-2);display:grid;place-items:center}
.qb-ic .ic{width:20px;height:20px}
.qb-b .k{margin-bottom:2px}
.qb-b p{margin:0;font-size:13.5px}
.qb-r{display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.stars{display:inline-flex;gap:2px;color:var(--live)}
.stars .ic{width:16px;height:16px}
.chestblock{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;margin-top:10px;padding:12px 16px;border-radius:14px;background:color-mix(in srgb,var(--ink) 4%,transparent);font-size:13px;color:var(--dim)}
.chestblock .mini-bar{flex:1;min-width:80px;max-width:200px}
.cb-ic{display:grid;place-items:center;color:var(--faint)}
.cb-ic .ic{width:20px;height:20px}
.chestblock.ready{color:var(--ink);background:color-mix(in srgb,var(--live) 10%,transparent)}
.chestblock.ready .cb-ic{color:var(--live)}
.chestblock.opened .cb-ic{color:var(--live)}
.certbetween{display:grid;grid-template-columns:150px minmax(0,1fr);gap:18px;align-items:center;margin:18px auto;max-width:560px;padding:4px 0;position:relative}
.certbetween::before{content:"";position:absolute;left:50%;top:-18px;bottom:-18px;width:1px;background:var(--line);z-index:-1}
.cbw-art{border-radius:8px;overflow:hidden;border:1px solid var(--line-2);background:var(--bg-2);filter:grayscale(1);opacity:.55;transition:opacity .3s}
.certbetween.claimed .cbw-art{filter:none;opacity:1}
.certbetween p{margin:0 0 8px;font-size:13px;color:var(--dim)}
.certbetween.soon{opacity:.7}
.certbetween > div:last-child{background:var(--bg);padding:6px 0}

/* ============================== lesson player ============================== */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:4px 10px;font-size:12px;color:var(--faint);margin-bottom:clamp(20px,3vw,34px)}
.crumbs a{color:var(--dim);text-decoration:none}
.crumbs a:hover{color:var(--ink)}
.l-grid{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:clamp(24px,4vw,64px);align-items:start}
.l-grid > *{min-width:0}
.lesson{max-width:760px}
.l-head{margin-bottom:28px}
.l-meta{display:flex;flex-wrap:wrap;gap:4px 16px;font-size:12px;color:var(--faint);margin-bottom:14px}
.l-num{color:var(--live)}
.l-title{font-size:clamp(34px,5.4vw,64px);line-height:1;letter-spacing:-.05em;margin:0}
.l-body{font-size:15px;line-height:1.8}
.l-body p{margin:0 0 14px}
.l-body ul{margin:0 0 14px;padding-left:20px}
.l-body li{margin:4px 0}
.l-body li::marker{color:var(--faint)}
.l-body a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line-2)}
.l-body a:hover{border-color:var(--ink)}
.l-body code{font-family:var(--mono);font-size:.9em;background:color-mix(in srgb,var(--ink) 8%,transparent);padding:1px 5px;border-radius:5px}
.l-body strong{font-weight:500}
.blk{margin:0 0 30px}
.b-k{font-size:11px;color:var(--faint);letter-spacing:.12em;text-transform:uppercase;margin-bottom:10px;display:flex;align-items:center;gap:8px}
.b-hook{font-family:var(--serif);font-style:italic;font-size:clamp(22px,2.6vw,28px);line-height:1.3;letter-spacing:-.01em;margin:0!important;color:var(--ink)}
.b-obj{border:1px solid var(--line);border-radius:14px;padding:16px 18px;background:color-mix(in srgb,var(--bg) 70%,transparent)}
.b-obj ul{list-style:none;padding:0!important;margin:0!important}
.b-obj li{position:relative;padding-left:22px}
.b-obj li::before{content:"";position:absolute;left:2px;top:.62em;width:9px;height:5px;border-left:1.5px solid var(--live);border-bottom:1.5px solid var(--live);transform:rotate(-45deg)}
.b-sec h2{font-size:clamp(22px,2.8vw,30px);letter-spacing:-.035em;line-height:1.15;margin:12px 0 12px;max-width:none}
.b-box{border:1px solid var(--line-2);border-radius:16px;padding:18px 20px 6px;background:var(--glass);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.b-box h3{font-size:17px;margin:0 0 10px}
.b-try{border-color:color-mix(in srgb,var(--live) 35%,transparent)}
.b-try .b-k{color:var(--live)}
.try-steps{counter-reset:s;list-style:none;padding:0!important}
.try-steps li{counter-increment:s;position:relative;padding-left:34px;margin:8px 0}
.try-steps li::before{content:counter(s,decimal-leading-zero);position:absolute;left:0;top:0;font-size:11px;color:var(--live);border:1px solid color-mix(in srgb,var(--live) 40%,transparent);border-radius:999px;padding:0 5px;line-height:1.7}
.b-ctx{border-style:solid;position:relative;overflow:hidden}
.b-ctx.tone-africa{border-color:color-mix(in srgb,var(--live) 30%,transparent)}
.b-ctx.tone-africa::after{content:"";position:absolute;right:-20px;bottom:-30px;width:150px;height:150px;background:radial-gradient(circle,color-mix(in srgb,var(--live) 30%,transparent) 1.2px,transparent 1.7px) 0 0/8px 8px;-webkit-mask-image:radial-gradient(circle,#000,transparent 70%);mask-image:radial-gradient(circle,#000,transparent 70%);pointer-events:none}
.b-ctx.tone-warn{border-color:color-mix(in srgb,var(--warn) 45%,transparent)}
.b-ctx.tone-warn .b-k{color:var(--warn)}
.b-ctx.tone-celo .b-k,.b-ctx.tone-africa .b-k{color:var(--live)}
.ctx-ic{display:inline-block;width:7px;height:7px;border-radius:50%;background:currentColor}
.b-recap{border-top:1px solid var(--line);padding-top:16px}
.b-recap ul{list-style:none;padding:0!important;counter-reset:r}
.b-recap li{counter-increment:r;padding:8px 0 8px 36px;position:relative;border-bottom:1px solid var(--line)}
.b-recap li::before{content:counter(r,decimal-leading-zero);position:absolute;left:0;top:8px;font-size:12px;color:var(--live)}
.b-deeper ul{list-style:none;padding:0!important;border-top:1px solid var(--line)}
.b-deeper li{padding:10px 0;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:2px}
.b-deeper li span{color:var(--faint);font-size:12.5px}
.b-deeper a{border:0!important;font-size:14px}
.b-deeper a:hover{color:var(--live)}
.b-bad{font-size:12.5px;color:var(--faint);border:1px dashed var(--line-2);border-radius:12px;padding:12px 14px}
/* figures */
.b-fig{margin:0;border:1px solid var(--line);border-radius:16px;padding:20px;background:color-mix(in srgb,var(--bg) 72%,transparent);overflow:hidden}
.b-fig figcaption,.b-code figcaption,.b-term figcaption,.b-table figcaption{font-size:12px;color:var(--faint);margin-top:12px}
.b-fig figcaption .it{font-size:14px;color:var(--dim)}
.fg-flow{display:flex;align-items:center;gap:0;flex-wrap:wrap;position:relative;row-gap:12px}
.fg-node{flex:1 1 110px;min-width:0;border:1px solid var(--line-2);border-radius:12px;padding:10px 12px;background:var(--bg);display:flex;flex-direction:column;gap:2px;position:relative;z-index:1}
.fg-node b{font-weight:400;font-size:10.5px;color:var(--faint);letter-spacing:.08em}
.fg-node span{font-size:13.5px;overflow-wrap:anywhere}
.fg-arr{flex:0 0 26px;height:1px;background:var(--line-2);position:relative}
.fg-arr::after{content:"";position:absolute;right:0;top:-3px;border-left:6px solid var(--line-2);border-top:3.5px solid transparent;border-bottom:3.5px solid transparent}
.fg-loop{flex:1 1 100%;height:22px;margin:0 8% 0;border:1px dashed var(--line-2);border-top:0;border-radius:0 0 14px 14px;position:relative;margin-top:-6px}
.fg-loop span{position:absolute;left:50%;bottom:-9px;transform:translateX(-50%);background:var(--bg);padding:0 8px;font-size:10.5px;color:var(--faint);letter-spacing:.08em}
@media (prefers-reduced-motion:no-preference){
  .fg-node{animation:lit 4.8s ease-in-out infinite;animation-delay:calc(var(--i) * .8s)}
  @keyframes lit{0%,100%{border-color:var(--line-2)}10%{border-color:var(--live)}22%{border-color:var(--line-2)}}
}
.fg-stack{display:flex;flex-direction:column;gap:6px}
.fg-layer{display:grid;grid-template-columns:120px minmax(0,1fr);gap:12px;align-items:center;border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:var(--bg)}
.fg-layer .k{margin:0;font-size:11px}
.fg-layer .v{display:flex;flex-wrap:wrap;gap:6px}
.chip{font-size:12px;border:1px solid var(--line-2);padding:1px 9px;border-radius:999px}
.fg-compare{display:grid;grid-template-columns:repeat(var(--c),minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.fg-col{background:var(--bg);padding:14px 16px;min-width:0}
.fg-col h4{margin:0 0 8px;font-weight:400;font-size:15px;font-family:var(--serif);font-style:italic;font-size:20px}
.fg-col ul{margin:0!important;padding-left:18px!important;font-size:13px;color:var(--dim)}
.fg-text{font-family:var(--serif);font-style:italic;font-size:20px;margin:0 0 12px!important}
.fg-toks{display:flex;flex-wrap:wrap;gap:4px}
.tok{display:inline-flex;flex-direction:column;align-items:center;border:1px solid var(--line-2);border-radius:8px;padding:4px 8px 2px;font-size:14px;line-height:1.3}
.tok:nth-child(even){background:color-mix(in srgb,var(--ink) 10%,var(--bg))}
.tok:nth-child(odd){background:color-mix(in srgb,var(--ink) 4%,var(--bg))}
.tok small{font-size:9.5px;color:var(--faint)}
.tok .sp{color:var(--faint);font-style:normal}
.tok.next{border-style:dashed;border-color:var(--live);color:var(--live);background:transparent}
.fg-next{margin-top:16px;border-top:1px solid var(--line);padding-top:12px}
.fg-next-h{font-size:11px;color:var(--faint);letter-spacing:.08em;margin-bottom:8px}
.pr{display:grid;grid-template-columns:minmax(70px,auto) minmax(0,1fr) 48px;gap:10px;align-items:center;font-size:13px;padding:3px 0}
.pr .t{white-space:pre}
.pr .bar{height:8px}
.pr .bar i{width:var(--w)}
.pr .p{text-align:right;color:var(--dim);font-variant-numeric:tabular-nums;font-size:12px}
.fg-steps{list-style:none;margin:0!important;padding:0!important;display:grid;gap:0;border-left:1px solid var(--line-2)}
.fg-steps li{display:grid;grid-template-columns:34px minmax(0,1fr);gap:10px;padding:8px 0 8px 14px;position:relative;margin:0!important}
.fg-steps li::before{content:"";position:absolute;left:-4px;top:16px;width:7px;height:7px;border-radius:50%;background:var(--bg);border:1px solid var(--live)}
.fg-steps b{font-weight:400;color:var(--live);font-size:12px;padding-top:3px}
.fg-steps strong{display:block;font-weight:400}
.fg-steps span{display:block;color:var(--dim);font-size:13px}
/* code, terminal, table, stats, quote */
.b-code,.b-term{margin:0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:color-mix(in srgb,var(--bg) 88%,#000)}
:root[data-theme="light"] .b-code,:root[data-theme="light"] .b-term{background:color-mix(in srgb,var(--bg) 92%,#fff)}
.code-h{display:flex;justify-content:space-between;align-items:center;padding:7px 12px 7px 14px;border-bottom:1px solid var(--line);font-size:11px;color:var(--faint);letter-spacing:.08em}
.copy{background:none;border:1px solid var(--line-2);border-radius:999px;padding:2px 10px;font-size:11px;color:var(--dim);cursor:pointer}
.copy:hover{color:var(--ink);border-color:var(--ink)}
.code-acts{display:flex;gap:6px}
/* "ship it": the artifact the lesson leaves you with */
.b-ship{border-color:color-mix(in srgb,var(--ink) 40%,transparent);padding-bottom:18px}
.b-ship .b-k{color:var(--ink)}
.b-ship .b-code{margin-top:6px}
/* key terms: what people say vs what it actually means */
.terms{margin:0;border-top:1px solid var(--line)}
.term{display:grid;grid-template-columns:minmax(0,.62fr) minmax(0,2fr);gap:18px;padding:13px 0;border-bottom:1px solid var(--line)}
.term dt{font-size:14.5px;letter-spacing:-.01em;color:var(--ink)}
.term dd{margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.term p{margin:0;font-size:13.5px;line-height:1.55}
.term small{display:block;font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin-bottom:3px}
.term .say{color:var(--dim)}
.term .means{color:var(--ink)}
.b-code pre,.b-term pre{margin:0;padding:14px 16px;overflow-x:auto;font-family:var(--mono);font-size:13px;line-height:1.65;tab-size:2}
.b-code figcaption,.b-term figcaption{padding:0 16px 12px;margin:0}
.c-com{color:var(--faint);font-style:italic}
.c-str{color:var(--live)}
.c-num{color:var(--warn)}
.c-kw{color:var(--ink);font-weight:500}
.b-code code{color:var(--dim);background:none;padding:0}
.b-term pre{color:var(--dim);white-space:pre-wrap;word-break:break-word}
.b-term .cmd{color:var(--ink)}
.b-term .pr{color:var(--live);display:inline}
.b-table{margin:0}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px}
.b-table table{border-collapse:collapse;width:100%;font-size:13px;line-height:1.5}
.b-table th{text-align:left;font-weight:400;color:var(--faint);font-size:11.5px;letter-spacing:.06em;padding:10px 12px;border-bottom:1px solid var(--line-2);white-space:nowrap}
.b-table td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top;min-width:120px}
.b-table tr:last-child td{border-bottom:0}
.b-stat{display:grid;grid-template-columns:repeat(var(--c),minmax(0,1fr));border-top:1px solid var(--line);border-left:1px solid var(--line)}
.b-stat .st{border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 16px;min-width:0}
.b-stat .v{font-weight:300;font-size:clamp(30px,4vw,44px);line-height:1;letter-spacing:-.045em;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}
.b-stat .l{color:var(--dim);font-size:12.5px;margin-top:10px;line-height:1.5}
.b-stat .src{font-size:11px;color:var(--faint)!important;border:0!important;display:inline-block;margin-top:6px}
.b-quote{margin:0;padding:6px 0 6px 20px;border-left:1px solid var(--live)}
.b-quote blockquote{margin:0;font-family:var(--serif);font-style:italic;font-size:clamp(20px,2.4vw,26px);line-height:1.35}
.b-quote figcaption{font-size:12px;color:var(--faint);margin-top:8px}
.b-quote figcaption::before{content:"— "}
/* checks */
.b-check{border:1px solid var(--line-2);border-radius:18px;padding:20px 20px 16px;background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);scroll-margin-top:calc(var(--top) + 30px)}
.b-check[data-state="first"],.b-check[data-state="retry"]{border-color:color-mix(in srgb,var(--live) 45%,transparent)}
.ck-h{display:flex;justify-content:space-between;align-items:center;gap:10px}
.ck-h .b-k{margin:0}
.ck-xp{font-size:11.5px;color:var(--faint);border:1px solid var(--line-2);border-radius:999px;padding:1px 9px;font-variant-numeric:tabular-nums}
.ck-xp.won{color:var(--live);border-color:color-mix(in srgb,var(--live) 50%,transparent)}
.ck-q{font-size:16.5px;line-height:1.5;margin:12px 0 4px!important;letter-spacing:-.01em}
.ck-hint{font-size:11.5px;color:var(--faint);margin:0 0 12px!important}
.ck-choices,.q-choices{display:grid;gap:8px}
.ck-choices.tf{grid-template-columns:repeat(2,minmax(0,1fr))}
.choice{display:grid;grid-template-columns:28px minmax(0,1fr) 18px;gap:10px;align-items:center;border:1px solid var(--line-2);border-radius:12px;padding:10px 12px;cursor:pointer;transition:border-color .2s,background .2s;position:relative;font-size:14px;line-height:1.45}
.ck-choices.tf .choice{grid-template-columns:minmax(0,1fr) 18px}
.ck-choices.tf .ltr{display:none}
.choice:hover{border-color:var(--ink)}
.choice input{position:absolute;opacity:0;pointer-events:none}
.choice:has(input:focus-visible){outline:1px solid var(--ink);outline-offset:2px}
.ltr{display:grid;place-items:center;width:26px;height:26px;border:1px solid var(--line-2);border-radius:8px;font-size:11.5px;color:var(--dim);transition:background .2s,color .2s}
.txt{min-width:0;overflow-wrap:anywhere}
.choice.sel,.choice:has(input:checked){border-color:var(--ink);background:color-mix(in srgb,var(--ink) 6%,transparent)}
.choice.sel .ltr,.choice:has(input:checked) .ltr{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.choice:has(input:disabled){cursor:default}
.choice:has(input:disabled):hover{border-color:var(--line-2)}
.choice .mk{width:14px;height:14px;justify-self:end}
.choice.wrong{border-color:color-mix(in srgb,var(--bad) 55%,transparent);background:color-mix(in srgb,var(--bad) 7%,transparent)}
.choice.wrong .ltr{background:transparent;color:var(--bad);border-color:var(--bad)}
.choice.wrong .mk::before{content:"×";color:var(--bad);font-size:16px;line-height:14px;font-style:normal}
.choice.right{border-color:color-mix(in srgb,var(--live) 60%,transparent);background:color-mix(in srgb,var(--live) 9%,transparent)}
.choice.right .ltr{background:var(--live);color:var(--bg);border-color:var(--live)}
.choice.right .mk{border-left:1.6px solid var(--live);border-bottom:1.6px solid var(--live);width:10px;height:6px;transform:rotate(-45deg) translate(2px,-2px)}
.ck-act{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin-top:14px}
.ck-fb{margin-top:12px;font-size:13.5px;color:var(--dim)}
.ck-fb:empty{display:none}
.ck-fb.pop{animation:pop .5s var(--ease)}
@keyframes pop{0%{transform:translateY(6px);opacity:0}100%{transform:none;opacity:1}}
.ck-tag{display:inline-block;font-size:12px;border:1px solid var(--line-2);border-radius:999px;padding:1px 10px;margin-right:6px;color:var(--dim)}
.ck-tag.ok{color:var(--live);border-color:color-mix(in srgb,var(--live) 50%,transparent)}
.ck-tag.no{color:var(--bad);border-color:color-mix(in srgb,var(--bad) 45%,transparent)}
.ck-why{margin-top:10px;padding-top:10px;border-top:1px solid var(--line);color:var(--dim)}
.ck-why b{color:var(--ink);font-weight:500}
/* end of lesson */
.end-mark{height:1px}
.l-end{border-top:1px solid var(--line);margin-top:10px;padding-top:24px}
.le-status{font-size:13px;color:var(--dim);margin-bottom:12px}
.le-status .ok,.p-read .ok{color:var(--live);display:inline-flex;align-items:center;gap:6px}
.le-nav{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px;margin-top:28px}
.pn{display:flex;flex-direction:column;gap:4px;padding:14px 16px;border:1px solid var(--line);border-radius:14px;text-decoration:none;transition:border-color .2s;min-width:0}
.pn:hover,.pn:focus-visible{border-color:var(--ink);outline:none}
.pn small{font-size:11px;color:var(--faint);display:inline-flex;align-items:center;gap:6px}
.pn span{font-size:13.5px;overflow-wrap:anywhere}
.pn.next{text-align:right;align-items:flex-end}
.l-side{position:sticky;top:calc(var(--top) + 24px)}
.panel{border:1px solid var(--line-2);border-radius:18px;padding:18px;background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);display:flex;flex-direction:column;gap:12px}
.pn-prog{display:grid;grid-template-columns:52px minmax(0,1fr);gap:12px;align-items:center}
.pn-prog b{display:block;font-weight:300;font-size:22px;letter-spacing:-.03em;line-height:1}
.pn-prog span{font-size:11.5px;color:var(--faint)}
.ring-wrap{position:relative;width:52px;height:52px}
.ring{width:52px;height:52px;transform:rotate(-90deg)}
.ring circle{fill:none;stroke-width:2.5}
.ring .bg{stroke:var(--line-2)}
.ring .fg{stroke:var(--live);stroke-linecap:round;transition:stroke-dashoffset .3s linear}
.ring-wrap span{position:absolute;inset:0;display:grid;place-items:center;font-size:11px;font-variant-numeric:tabular-nums}
.p-row{display:flex;justify-content:space-between;font-size:12.5px;color:var(--dim);border-top:1px solid var(--line);padding-top:12px}
.p-row b{color:var(--live);font-weight:400}
.p-checks{display:flex;flex-direction:column;gap:2px}
.pc{display:grid;grid-template-columns:20px minmax(0,1fr) auto;gap:6px;align-items:center;font-size:12.5px;color:var(--dim);text-decoration:none;padding:4px 6px;margin:0 -6px;border-radius:8px}
.pc:hover{background:color-mix(in srgb,var(--ink) 5%,transparent)}
.pc em{font-style:normal;font-size:11.5px;color:var(--faint)}
.pc.first,.pc.retry{color:var(--ink)}
.pc.first .ls-ic,.pc.retry .ls-ic,.pc.first em,.pc.retry em{color:var(--live)}
.pc.miss em{color:var(--warn)}
.p-read{font-size:12.5px;color:var(--faint)}
.p-read span{display:inline-flex;align-items:center;gap:6px}
.p-why{font-size:12px;color:var(--faint);margin:0;line-height:1.5}
.p-nav{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding-top:12px}
.keys{font-size:11px;color:var(--faint);border:1px solid var(--line);border-radius:6px;padding:1px 6px;letter-spacing:.1em}
.lbar{display:none}
.drawer{position:fixed;inset:0;z-index:70}
.dr-back{position:absolute;inset:0;background:color-mix(in srgb,var(--bg) 60%,transparent);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);opacity:0;transition:opacity .3s}
.dr-panel{position:absolute;left:0;top:0;bottom:0;width:min(420px,92vw);background:var(--bg);border-right:1px solid var(--line-2);transform:translateX(-102%);transition:transform .4s var(--ease);display:flex;flex-direction:column}
.drawer.in .dr-back{opacity:1}
.drawer.in .dr-panel{transform:none}
.dr-h{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;padding:18px 18px 14px;border-bottom:1px solid var(--line)}
.dr-h b{font-weight:400;font-size:15px}
.dr-h .chip-btn .ic{width:14px;height:14px}
.dr-body{overflow-y:auto;padding:10px 12px 30px;flex:1}
.sy-u{margin-top:12px}
.sy-uh{display:flex;justify-content:space-between;gap:10px;font-size:11.5px;color:var(--faint);padding:4px 6px;letter-spacing:.03em}
.sy-uh b{font-weight:400;color:var(--live)}
.sy-u ol{list-style:none;margin:0;padding:0}
.sy-u a{display:grid;grid-template-columns:22px 34px minmax(0,1fr);gap:6px;align-items:center;padding:8px 6px;border-radius:9px;text-decoration:none;font-size:13px;color:var(--dim)}
.sy-u a:hover{background:color-mix(in srgb,var(--ink) 5%,transparent);color:var(--ink)}
.sy-u a.on{background:color-mix(in srgb,var(--live) 10%,transparent);color:var(--ink)}
.sy-u a.done .ls-ic{color:var(--live)}
.sy-u .n{font-size:11.5px;color:var(--faint)}
.sy-quiz{display:flex;align-items:center;gap:8px;margin:16px 6px 0;padding:12px 14px;border:1px dashed var(--line-2);border-radius:12px;text-decoration:none;font-size:13px}
.sy-quiz:hover{border-color:var(--ink)}

/* ============================== quiz ============================== */
.quizv{max-width:820px}
.quiz-card{border:1px solid var(--line-2);border-radius:22px;padding:clamp(22px,4vw,40px);background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);position:relative;overflow:hidden}
.quiz-card.center{text-align:center;display:flex;flex-direction:column;align-items:center;gap:14px;padding:60px 20px}
.q-title{font-size:clamp(32px,5vw,58px);line-height:1;letter-spacing:-.05em;margin:0 0 18px;font-weight:300}
.rules{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.rules li{padding:10px 0;border-bottom:1px solid var(--line);font-size:13.5px;color:var(--dim);display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.rules b{color:var(--ink);font-weight:400}
.attempts{margin-top:22px}
.att{display:grid;grid-template-columns:minmax(0,1fr) auto auto auto;gap:14px;align-items:center;font-size:12.5px;color:var(--dim);padding:7px 0;border-bottom:1px solid var(--line)}
.att .ok{color:var(--live)}
.q-top{display:flex;justify-content:space-between;gap:10px}
.segs{display:grid;grid-template-columns:repeat(auto-fit,minmax(10px,1fr));gap:4px;margin:6px 0 26px}
.segs i{height:4px;border-radius:4px;background:var(--line-2);transition:background .3s}
.segs i.done{background:color-mix(in srgb,var(--live) 55%,transparent)}
.segs i.on{background:var(--ink)}
.q-q{font-size:clamp(20px,2.6vw,28px);line-height:1.3;letter-spacing:-.025em;margin:0 0 22px;max-width:none;font-weight:400}
.q-choices .choice{padding:14px 14px;font-size:15px;grid-template-columns:28px minmax(0,1fr)}
.q-nav{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:26px;flex-wrap:wrap}
.result .score{display:flex;align-items:center;gap:26px;margin:6px 0 18px;flex-wrap:wrap}
.score .big{font-weight:300;font-size:clamp(70px,11vw,120px);letter-spacing:-.06em;line-height:.9;font-variant-numeric:tabular-nums}
.score .big small{font-size:.32em;color:var(--faint);letter-spacing:-.02em;margin-left:6px}
.res-stars .stars .ic{width:30px;height:30px}
.result.fail .res-stars .stars{color:var(--faint)}
.score .pct{font-size:14px;color:var(--dim);margin-top:4px}
.dots-res{display:flex;flex-wrap:wrap;gap:6px;margin:16px 0}
.dots-res span{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-size:11px;border:1px solid var(--line-2);color:var(--faint)}
.dots-res .ok{background:var(--live);border-color:var(--live);color:var(--bg)}
.dots-res .no{border-color:color-mix(in srgb,var(--bad) 55%,transparent);color:var(--bad)}
.review-ls{border-top:1px solid var(--line);margin:10px 0}
.review-ls .ls{margin:0;border-bottom:1px solid var(--line);border-radius:0}
.missed{margin-top:14px;border:1px solid var(--line);border-radius:14px;padding:4px 16px}
.missed summary{cursor:pointer;padding:10px 0;font-size:13px;color:var(--dim)}
.mq{border-top:1px solid var(--line);padding:12px 0}
.mq p{margin:0 0 6px;font-size:13.5px}
.mq-w{color:var(--dim)}
.mq-w b{color:var(--ink);font-weight:500}
.mq-t{font-size:12px!important;color:var(--faint)}
.mq-t a{color:var(--ink)}

/* ============================== certificate ============================== */
.certv{max-width:1100px}
.cert-top{margin-bottom:22px}
.cert-stage{position:relative;border-radius:14px;overflow:hidden;box-shadow:0 50px 120px -50px rgba(0,0,0,.8);border:1px solid var(--line-2);background:#F4F2EC}
.cert-stage canvas{display:block;width:100%;height:auto;aspect-ratio:16/9}
.cert-stage.ghost{opacity:.9;transform:rotate(1.5deg);transition:transform .6s var(--ease)}
.cert-stage.ghost:hover{transform:none}
.cert-stage .shine{position:absolute;inset:0;pointer-events:none;background:linear-gradient(105deg,transparent 30%,rgba(255,255,255,.55) 45%,transparent 60%);transform:translateX(-120%)}
@media (prefers-reduced-motion:no-preference){
  .cert-stage.reveal{animation:rise 1.4s var(--ease) both}
  .cert-stage.reveal .shine{animation:shine 1.6s ease .9s both}
  @keyframes rise{0%{transform:translateY(70px) scale(.94) rotate(-1.5deg);opacity:0;filter:blur(6px)}100%{transform:none;opacity:1;filter:none}}
  @keyframes shine{to{transform:translateX(120%)}}
}
.cert-grid{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px 30px;align-items:start;margin-top:24px}
.cert-meta{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 24px}
.cm span{display:block;font-size:11px;color:var(--faint);letter-spacing:.06em}
.cm b{font-weight:400;font-size:14px;overflow-wrap:anywhere}
.cert-meta .lnk{grid-column:1/-1;justify-self:start}
.cert-act{display:flex;flex-direction:column;gap:8px;min-width:240px}
.cert-act .btn{justify-content:flex-start}
.mint-box{margin-top:22px}
.mint-box:empty{display:none}
.mint-box > .k{margin-bottom:10px}
.mint-soon,.minted{display:grid;grid-template-columns:28px minmax(0,1fr);gap:12px;align-items:start;border:1px dashed var(--line-2);border-radius:14px;padding:16px}
.mint-soon > .ic,.minted > .ic{width:22px;height:22px;color:var(--faint)}
.minted{border-style:solid;border-color:color-mix(in srgb,var(--live) 45%,transparent)}
.minted > .ic{color:var(--live)}
.mint-soon p,.minted p{margin:4px 0 0;font-size:13px}
.mint-soon b,.minted b{font-weight:400}
.msteps{list-style:none;margin:0 0 10px;padding:0;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.msteps li{display:grid;grid-template-columns:26px minmax(0,1fr);gap:10px;align-items:center;padding:10px 14px;border-bottom:1px solid var(--line);font-size:13px;color:var(--faint)}
.msteps li:last-child{border-bottom:0}
.msteps li.on{color:var(--ink);background:color-mix(in srgb,var(--ink) 4%,transparent)}
.msteps li.ok{color:var(--dim)}
.msteps li.ok .ms-ic{color:var(--live)}
.msteps li.fail{color:var(--bad)}
.ms-ic{display:grid;place-items:center}
.spin{display:block;width:14px;height:14px;border:1.5px solid var(--line-2);border-top-color:var(--ink);border-radius:50%;animation:spin 1s linear infinite}
.next-card{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px 24px;align-items:center;margin-top:30px;padding:22px;border:1px solid var(--line);border-radius:18px;background:color-mix(in srgb,var(--bg) 70%,transparent)}
.next-card h3{font-family:var(--serif);font-style:italic;font-size:28px;margin-bottom:4px}
.next-card p{margin:0}
.next-card .cta{margin:0}
.claim{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:clamp(24px,4vw,56px);align-items:center}
.claim > *{min-width:0}
.claim-form{display:flex;flex-direction:column;gap:10px;max-width:440px}
.claim-form label{font-size:12px;color:var(--faint);letter-spacing:.04em}
.claim-form input,.imp textarea{width:100%;background:color-mix(in srgb,var(--bg) 70%,transparent);border:1px solid var(--line-2);border-radius:12px;padding:12px 14px;font-size:16px;color:var(--ink);outline:none;transition:border-color .2s}
.claim-form input:focus,.imp textarea:focus{border-color:var(--ink)}
.claim-form .btn{align-self:flex-start;margin-top:6px}
.cert-locked{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(24px,4vw,56px);align-items:center}
.cert-locked > *{min-width:0}
.cl-art img,.va img{border-radius:12px;border:1px solid var(--line-2);filter:grayscale(1);opacity:.6}

/* ============================== profile ============================== */
.me-hero{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,.8fr);gap:clamp(20px,4vw,56px);align-items:end;padding-bottom:clamp(24px,4vw,40px);border-bottom:1px solid var(--line)}
.me-hero > *{min-width:0}
.me-hero .t-title .it{font-size:1.08em}
.me-xp{max-width:560px}
.me-stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:16px;overflow:hidden}
.me-stats > div{background:color-mix(in srgb,var(--bg) 88%,transparent);padding:16px}
.me-stats b{display:flex;align-items:center;gap:6px;font-weight:300;font-size:30px;letter-spacing:-.04em;line-height:1;font-variant-numeric:tabular-nums}
.me-stats b .ic{width:22px;height:22px;color:var(--faint)}
.me-stats b.lit .ic{color:var(--live)}
.me-stats span{display:block;font-size:11.5px;color:var(--faint);margin-top:8px}
.me-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:14px;margin-top:clamp(24px,4vw,40px)}
.me-grid > *{min-width:0}
.card-s{border:1px solid var(--line-2);border-radius:18px;padding:20px;background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.card-s h3{font-size:22px;letter-spacing:-.03em;margin-bottom:8px}
.week-now{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:14px 0}
.week-now > div{background:var(--bg);padding:10px 12px}
.week-now span{display:block;font-size:11px;color:var(--faint)}
.week-now b{font-weight:400;font-size:14px}
.weeks{display:flex;gap:5px;flex-wrap:wrap;margin:6px 0 10px}
.wk{display:inline-block;width:22px;height:22px;border-radius:6px;border:1px solid var(--line-2)}
.wk.kept{background:var(--live);border-color:var(--live)}
.wk.frozen{background:repeating-linear-gradient(45deg,var(--line-2) 0 3px,transparent 3px 6px)}
.wk.missed{background:transparent;border-style:dashed}
.wk.open{border-color:var(--ink)}
.wk-key{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:11px;color:var(--faint)}
.wk-key span{display:inline-flex;align-items:center;gap:6px}
.wk-key .wk{width:12px;height:12px;border-radius:3px}
.badges{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}
.badge{display:grid;grid-template-columns:42px minmax(0,1fr);gap:12px;align-items:center;border:1px solid var(--line);border-radius:14px;padding:12px;color:var(--faint);min-width:0}
.badge b{display:block;font-weight:400;color:var(--dim);font-size:13.5px;overflow-wrap:anywhere}
.badge span:not(.b-ic){font-size:11.5px;display:block}
.b-ic{width:42px;height:42px;border-radius:50%;border:1px dashed var(--line-2);display:grid;place-items:center}
.b-ic .ic{width:18px;height:18px}
.badge.got{border-color:var(--line-2);background:color-mix(in srgb,var(--bg) 70%,transparent)}
.badge.got b{color:var(--ink)}
.badge.got .b-ic{border:1px solid var(--live);color:var(--live);background:color-mix(in srgb,var(--live) 10%,transparent)}
.mycerts{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}
.mycert{display:grid;grid-template-columns:120px minmax(0,1fr);gap:14px;align-items:center;border:1px solid var(--line-2);border-radius:14px;padding:10px;text-decoration:none;transition:border-color .2s}
.mycert:hover{border-color:var(--ink)}
.mycert img{border-radius:6px;border:1px solid var(--line)}
.mycert b{display:block;font-weight:400;font-size:14px}
.mycert span{display:block;font-size:11.5px;color:var(--faint);overflow-wrap:anywhere}
.history{border-top:1px solid var(--line)}
.h-row{display:grid;grid-template-columns:110px minmax(0,1fr) auto;gap:14px;padding:9px 0;border-bottom:1px solid var(--line);font-size:13px;align-items:baseline}
.h-d{color:var(--faint);font-size:12px;font-variant-numeric:tabular-nums}
.h-l{color:var(--dim);overflow-wrap:anywhere}
.h-row b{font-weight:400;color:var(--live);font-variant-numeric:tabular-nums;white-space:nowrap}
.h-row b.dim{color:var(--faint)}
.imp{margin-top:16px;display:flex;flex-direction:column;gap:10px;max-width:640px}
.imp textarea{font-family:var(--mono);font-size:12.5px;resize:vertical;min-height:110px}
.imp input[type=file]{font-size:12.5px;color:var(--dim);max-width:100%}

/* ============================== verify ============================== */
.vcard{border:1px solid var(--line-2);border-radius:18px;padding:22px;background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);margin-top:10px}
.vcard.center{text-align:center;display:flex;flex-direction:column;align-items:center;gap:10px}
.vcard p{margin:0 0 10px}
.vgrid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:22px;align-items:start}
.va img{filter:none;opacity:1}
.vlist{margin:0;display:flex;flex-direction:column}
.vlist > div{display:grid;grid-template-columns:90px minmax(0,1fr);gap:12px;padding:8px 0;border-bottom:1px solid var(--line);font-size:13px}
.vlist dt{color:var(--faint);font-size:12px}
.vlist dd{margin:0;overflow-wrap:anywhere}

/* ============================== empty / error ============================== */
.empty{border:1px dashed var(--line-2);border-radius:18px;padding:40px 24px;text-align:center;margin-top:8vh}
.empty.left{text-align:left;margin-top:30px}
.empty p{color:var(--dim);max-width:52ch;margin:0 auto}
.empty.left p{margin:0}

/* ============================== toasts, xp, moments ============================== */
.toasts{position:fixed;z-index:90;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none;width:min(520px,calc(100vw - 32px))}
.toast{display:flex;align-items:center;gap:10px;background:var(--ink);color:var(--bg);border-radius:999px;padding:9px 16px;font-size:12.5px;box-shadow:0 20px 50px -20px rgba(0,0,0,.6);opacity:0;transform:translateY(12px);transition:opacity .4s,transform .5s var(--ease);max-width:100%}
.toast.in{opacity:1;transform:none}
.toast b{font-weight:500}
.toast.good .t-ic{color:var(--live)}
:root[data-theme="light"] .toast.good .t-ic{color:#7BD88F}
.toast.warn{border-radius:14px}
.t-ic{display:grid;place-items:center}
body[data-route="learn"] .toasts{bottom:calc(84px + env(safe-area-inset-bottom,0px))}
.xp-float{position:fixed;z-index:95;pointer-events:none;font-size:13px;font-weight:500;color:var(--bg);background:var(--live);border-radius:999px;padding:3px 10px;transform:translate(-50%,0);white-space:nowrap;box-shadow:0 10px 30px -10px color-mix(in srgb,var(--live) 70%,transparent)}
.overlay{position:fixed;inset:0;z-index:80;display:grid;place-items:center;padding:20px;background:color-mix(in srgb,var(--bg) 78%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);opacity:0;transition:opacity .35s}
.overlay.in{opacity:1}
.overlay[hidden]{display:none}
.ov-card{position:relative;width:min(520px,100%);border:1px solid var(--line-2);border-radius:24px;padding:clamp(26px,5vw,44px) clamp(20px,4vw,40px);background:var(--card);text-align:center;box-shadow:0 60px 140px -50px rgba(0,0,0,.8);transform:translateY(20px) scale(.97);transition:transform .6s var(--ease);overflow:hidden}
.overlay.in .ov-card{transform:none}
.burst{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:0}
.ov-card > *{position:relative;z-index:1}
.lvl-moment .k,.chest-moment .k{color:var(--live);letter-spacing:.2em}
.lvl-num{display:grid;place-items:center;width:150px;height:150px;margin:10px auto 6px;border-radius:50%;border:1px solid var(--live);position:relative;background:radial-gradient(circle,color-mix(in srgb,var(--live) 22%,transparent) 1.2px,transparent 1.8px) 0 0/8px 8px}
.lvl-num::before{content:"";position:absolute;inset:-10px;border:1px dashed var(--line-2);border-radius:50%;animation:spin 30s linear infinite}
.lvl-num span{font-weight:300;font-size:84px;letter-spacing:-.06em;line-height:1}
.lvl-name{font-size:clamp(38px,6vw,56px);margin:6px auto 8px;max-width:none}
.lvl-moment p,.chest-moment p{margin:0 0 20px}
.chest-moment h2{font-size:clamp(24px,4vw,34px);margin:0 auto 8px;max-width:none}
.chest{position:relative;width:200px;height:160px;margin:16px auto 6px}
.chest svg{width:100%;height:100%;overflow:visible}
.chest path,.chest rect{fill:var(--bg-2);stroke:var(--ink);stroke-width:1.6}
.chest .band{fill:var(--bg-3)}
.chest .lock{fill:var(--live);stroke:var(--live)}
.chest .lid{transform-origin:30px 70px;transition:transform .8s var(--ease)}
.chest.open .lid{transform:rotate(-24deg) translate(-6px,-14px)}
.chest .glow{position:absolute;left:50%;top:44%;width:10px;height:10px;border-radius:50%;background:var(--live);transform:translate(-50%,-50%) scale(0);opacity:0;box-shadow:0 0 60px 30px color-mix(in srgb,var(--live) 50%,transparent);transition:transform .8s var(--ease),opacity .6s}
.chest.open .glow{transform:translate(-50%,-50%) scale(3);opacity:.9}
@media (prefers-reduced-motion:no-preference){.chest:not(.open) svg{animation:wobble 2.6s ease-in-out infinite}@keyframes wobble{0%,86%,100%{transform:none}90%{transform:rotate(-2deg)}94%{transform:rotate(2deg)}}}
.chest-xp{min-height:1.6em;font-size:15px}
.chest-xp b{color:var(--live);font-weight:500}

/* ============================== responsive ============================== */
@media (max-width:1100px){
  .tgrid.n3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .schools,.paths,.skills{grid-template-columns:repeat(2,minmax(0,1fr))}
  .modes.n4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .path{grid-template-columns:repeat(3,minmax(0,1fr));row-gap:18px}
  .path li:nth-child(3){border-right:0}
  .path li:nth-child(4){padding-left:0}
  .l-grid{grid-template-columns:minmax(0,1fr)}
  .l-side{display:none}
  .lbar{display:flex;position:fixed;z-index:45;left:0;right:0;bottom:0;align-items:center;gap:10px;padding:10px var(--gut) calc(10px + env(safe-area-inset-bottom,0px));background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--line-2)}
  .lb-syl{width:40px;height:40px;border-radius:50%;border:1px solid var(--line-2);background:none;display:grid;place-items:center;cursor:pointer;flex:0 0 auto}
  .lb-mid{flex:1;min-width:0;display:flex;flex-direction:column;line-height:1.3}
  .lb-mid b{font-weight:400;font-size:12.5px}
  .lb-mid span{font-size:11px;color:var(--faint)}
  body[data-route="learn"] .app{padding-bottom:120px}
}
@media (max-width:900px){
  .hero{grid-template-columns:1fr;min-height:0}
  .hero-r{max-width:560px}
  .tgrid,.tgrid.n3,.xp-grid,.tiers,.modes,.modes.n4,.me-grid,.schools,.paths,.reading,.skills{grid-template-columns:1fr}
  .t-grid{grid-template-columns:minmax(0,1fr)}
  .t-side{position:static;order:-1}
  .side-certs{display:none}
  .claim,.cert-locked,.me-hero,.vgrid{grid-template-columns:1fr}
  .cert-grid{grid-template-columns:1fr}
  .cert-act{min-width:0;flex-direction:row;flex-wrap:wrap}
  .next-card{grid-template-columns:1fr}
}
@media (max-width:760px){
  .top-nav a:not(.port){display:none}
  .top-nav .port{display:none}
}
@media (max-width:640px){
  :root{--top:58px}
  .hero-stats{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hero-stats div:nth-child(n+3){padding-top:14px}
  .path{grid-template-columns:1fr}
  .path li{border-right:0;padding:14px 0!important;border-bottom:1px solid var(--line)}
  .desk-card{left:0;width:88%}
  .ph-head{padding:16px}
  .ph-body{padding:0 14px 16px}
  .unit{padding:12px 10px 6px}
  .ls{grid-template-columns:20px 32px minmax(0,1fr);row-gap:0}
  .ls-m{grid-column:3;font-size:11px}
  .qblock{grid-template-columns:1fr;text-align:left}
  .qb-ic{display:none}
  .qb-r{align-items:flex-start;flex-direction:row;flex-wrap:wrap}
  .certbetween{grid-template-columns:100px minmax(0,1fr);gap:12px}
  .fg-layer{grid-template-columns:1fr;gap:6px}
  .fg-compare{grid-template-columns:1fr}
  .fg-flow{flex-direction:column;align-items:stretch}
  .fg-arr{flex:0 0 18px;width:1px;height:18px;align-self:center}
  .fg-arr::after{right:-3px;top:auto;bottom:0;border-top:6px solid var(--line-2);border-left:3.5px solid transparent;border-right:3.5px solid transparent;border-bottom:0}
  .fg-node{flex:0 0 auto}
  .fg-loop{display:none}
  .fg-flow.loop::after{content:"↺ repeat";text-align:center;font-size:11px;color:var(--faint);letter-spacing:.08em;margin-top:6px}
  .b-stat{grid-template-columns:repeat(2,minmax(0,1fr))}
  .b-box,.b-check{padding-left:16px;padding-right:16px}
  .term,.term dd{grid-template-columns:1fr;gap:6px}
  .b-fig{padding:14px}
  .le-nav{grid-template-columns:1fr}
  .pn.next{text-align:left;align-items:flex-start}
  .att{grid-template-columns:1fr auto;row-gap:2px}
  .cert-meta{grid-template-columns:1fr 1fr}
  .cert-act .btn{flex:1 1 100%}
  .h-row{grid-template-columns:1fr auto;row-gap:0}
  .h-d{grid-column:1/-1}
  .week-now{grid-template-columns:1fr 1fr 1fr}
  .quiz-card{border-radius:18px}
  .q-nav .keys{display:none}
  .vlist > div{grid-template-columns:80px minmax(0,1fr)}
  .mycert{grid-template-columns:90px minmax(0,1fr)}
}
@media (max-width:440px){
  .mark-t{display:none}
  .me-chip{gap:7px;padding-right:9px}
  .ck-choices.tf{grid-template-columns:1fr 1fr}
  .cert-meta{grid-template-columns:1fr}
  .earn-r{font-size:12.5px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .path::before{display:none}
}
.nojs{position:fixed;inset:auto 16px 16px;z-index:99;background:var(--ink);color:var(--bg);padding:12px 16px;border-radius:12px;font-size:13px}
h1[tabindex="-1"]:focus{outline:none}
.l-save{font-size:12px}
/* print, or "save as PDF": the lesson alone, black on white, for reading offline */
@media print{
  :root,:root[data-theme="light"],:root[data-theme="dark"]{--bg:#fff;--bg-2:#fff;--bg-3:#f4f4f4;--ink:#111;--dim:#333;--faint:#666;--line:#ddd;--line-2:#bbb;--live:#1E6B34;--warn:#7a5510;--card:#fff;--glass:#fff}
  html,body{background:#fff!important;color:#111}
  #ribbon,.dots,.grain,.read-bar,.top,.skip,.l-side,.lbar,.drawer,.l-end,.end-mark,.toasts,.overlay,.nojs,.ck-act,.ck-fb,.ck-xp,.copy,.code-acts,.l-save,.foot{display:none!important}
  .app{padding:0}
  .app .view,.js .rv,.app:not(.in) .view{opacity:1!important;transform:none!important}
  .l-grid{display:block}
  .b-box,.b-check,.b-code,.b-term,.b-fig,.b-table,.b-terms,.b-stat{break-inside:avoid;backdrop-filter:none!important;-webkit-backdrop-filter:none!important;box-shadow:none!important}
  .b-code pre,.b-term pre{white-space:pre-wrap;overflow:visible;font-size:11px}
  .l-body a[href^="http"]::after{content:" (" attr(href) ")";font-size:10px;color:#666;word-break:break-all}
}