/* LaserCube Academy. Same tokens, fonts and header as the wiki homepage (index.html), so the academy reads as part of the wiki. */
@font-face{font-family:Inter;font-style:normal;font-weight:400 700;font-display:swap;src:url(../fonts/inter/inter-latin.woff2) format("woff2");unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD}
@font-face{font-family:Inter;font-style:normal;font-weight:400 700;font-display:swap;src:url(../fonts/inter/inter-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF}
:root{
  --bg:#ffffff;--bg-2:#f5f5f7;--line:rgba(10,10,20,.1);--line-2:rgba(10,10,20,.18);
  --text:#0a0a0c;--muted:#55555f;--subtle:#696973;
  --accent:#2b62fd;--accent-hover:#1844c8;--accent-soft:rgba(43,98,253,.09);
  --ok:#0f7a3d;--ok-soft:rgba(15,122,61,.1);--bad:#b42318;--bad-soft:rgba(180,35,24,.08);
  --shadow:0 30px 70px -30px rgba(10,10,20,.35);
  --font:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --stage:#0a0a0c;--yellow:#ffd60a;--wm:url(#wm-ink);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0a0a0c;--bg-2:#121216;--line:rgba(255,255,255,.09);--line-2:rgba(255,255,255,.17);
    --text:#f2f2f5;--muted:#a2a2ad;--subtle:#8e8e9a;
    --accent:#86a5ff;--accent-hover:#b3c6ff;--accent-soft:rgba(134,165,255,.12);
    --ok:#5fd68f;--ok-soft:rgba(95,214,143,.12);--bad:#ff8a80;--bad-soft:rgba(255,138,128,.1);
    --shadow:0 30px 80px -30px rgba(0,0,0,.9);--wm:url(#wm-white);
    color-scheme:dark;
  }
}
:root[data-theme="dark"],.stage{
  --bg:#0a0a0c;--bg-2:#121216;--line:rgba(255,255,255,.09);--line-2:rgba(255,255,255,.17);
  --text:#f2f2f5;--muted:#a2a2ad;--subtle:#8e8e9a;
  --accent:#86a5ff;--accent-hover:#b3c6ff;--accent-soft:rgba(134,165,255,.12);
  --ok:#5fd68f;--ok-soft:rgba(95,214,143,.12);--bad:#ff8a80;--bad-soft:rgba(255,138,128,.1);
  --shadow:0 30px 80px -30px rgba(0,0,0,.9);--wm:url(#wm-white);
}
:root[data-theme="dark"]{color-scheme:dark}
.stage{background:var(--stage);color:var(--text)}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
a{color:inherit;text-decoration:none}
img,svg{display:block}
button,input{font:inherit;color:inherit}
h1,h2,h3{text-wrap:balance}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.skip{position:absolute;left:-9999px;top:8px;z-index:100;background:#fff;color:#000;padding:8px 14px;border-radius:6px}
.skip:focus{left:16px}
.sr{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.container{width:100%;max-width:1200px;margin:0 auto;padding-left:32px;padding-right:32px}
.icon{width:18px;height:18px;flex:none;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.label{font:600 11.5px/1.4 var(--font);letter-spacing:.09em;text-transform:uppercase;color:var(--subtle)}
.js .no-js-only{display:none}
.no-js .js-only{display:none}

/* header + footer (as on the wiki homepage) */
.site-header{position:sticky;top:0;z-index:40;border-bottom:1px solid var(--line);background:rgba(10,10,12,.97);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px)}
.site-header .container{display:flex;align-items:center;gap:28px;height:64px}
.brand{display:flex;align-items:center;gap:14px;flex:none}
.wordmark{width:148px;height:auto}
.brand-sep{width:1px;height:18px;background:var(--line-2)}
.brand-name{font-size:14.5px;font-weight:500;color:var(--muted);white-space:nowrap}
.nav{display:flex;gap:22px}
.nav a{font-size:14.5px;color:var(--muted);transition:color .15s}
.nav a:hover,.nav a[aria-current]{color:var(--text)}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:6px}
.icon-btn{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:8px;border:0;background:transparent;color:var(--muted);cursor:pointer;transition:background .15s,color .15s}
.icon-btn:hover{background:rgba(255,255,255,.07);color:var(--text)}
.menu{display:none;position:relative}
.menu summary{list-style:none;cursor:pointer}
.menu summary::-webkit-details-marker{display:none}
.menu-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:50;display:grid;min-width:210px;padding:6px;border-radius:10px;border:1px solid var(--line-2);background:#121216;box-shadow:var(--shadow)}
.menu-panel a{display:flex;align-items:center;min-height:44px;padding:0 14px;border-radius:8px;font-size:15px;color:var(--muted)}
.menu-panel a:hover{background:rgba(255,255,255,.06);color:var(--text)}
.theme-dark-icon{display:none}
:root[data-theme="dark"] .theme-dark-icon{display:block}
:root[data-theme="dark"] .theme-light-icon{display:none}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .theme-dark-icon{display:block}
  :root:not([data-theme="light"]) .theme-light-icon{display:none}
}
.site-footer{margin-top:96px;border-top:1px solid var(--line);padding:28px 0 36px;font-size:14px;color:var(--subtle)}
.site-footer .container{display:flex;flex-wrap:wrap;align-items:center;gap:14px 28px}
.site-footer .wordmark{width:104px;opacity:.8}
.site-footer nav{display:flex;flex-wrap:wrap;gap:6px 22px}
.site-footer nav a:hover{color:var(--text)}
.site-footer .copy{margin-left:auto}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 18px;border-radius:8px;font-size:15px;font-weight:500;border:1px solid var(--line-2);background:transparent;cursor:pointer;transition:border-color .15s,background .15s,color .15s}
.btn:hover{border-color:var(--text)}
.btn.solid{background:var(--text);color:var(--bg);border-color:var(--text)}
.btn.solid:hover{opacity:.88}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.btn .icon{width:16px;height:16px}
.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.link{color:var(--accent);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.link:hover{color:var(--accent-hover)}

/* hero (catalogue + course top) */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero::before{content:"";position:absolute;inset:auto -10% -1px -10%;height:1px;background:linear-gradient(90deg,transparent,#2b62fd 30%,#f98dff 55%,#fff 70%,transparent)}
.hero .container{padding-top:72px;padding-bottom:64px}
.hero h1{margin:14px 0 16px;font-size:clamp(34px,4.6vw,56px);line-height:1.04;letter-spacing:-.04em;font-weight:600;max-width:16ch}
.hero .lead{margin:0;max-width:36em;font-size:18px;line-height:1.55;color:var(--muted)}
.meta{display:flex;flex-wrap:wrap;gap:8px 22px;margin:22px 0 0;padding:0;list-style:none;font-size:14.5px;color:var(--muted)}
.meta li{display:flex;align-items:center;gap:8px}
.meta .icon{width:16px;height:16px;color:var(--subtle)}

/* catalogue */
.block{padding-top:72px}
.head h2{margin:8px 0 0;font-size:clamp(24px,2.8vw,32px);line-height:1.15;letter-spacing:-.03em;font-weight:600}
.head p{margin:10px 0 0;color:var(--muted);max-width:40em}
.card{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);margin-top:28px;border-radius:14px;overflow:hidden;box-shadow:0 0 0 1px var(--line);background:var(--bg)}
.card-img{position:relative;min-height:320px;background:#000}
.card-img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.card-body{padding:40px 44px}
.card h3{margin:10px 0 10px;font-size:clamp(22px,2.4vw,28px);line-height:1.2;letter-spacing:-.025em;font-weight:600}
.card h3 a:hover{color:var(--accent)}
.card p{margin:0 0 12px;color:var(--muted);max-width:34em}
.progress{margin:20px 0 0;max-width:420px}
.progress-bar{height:6px;border-radius:99px;background:var(--line);overflow:hidden}
.progress-bar span{display:block;height:100%;width:0;border-radius:99px;background:var(--accent);transition:width .3s}
.progress-text{margin-top:8px;font-size:14px;color:var(--subtle)}
.steps{list-style:none;margin:28px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line)}
.steps li{padding:24px 24px 4px 0}
.steps li + li{padding-left:24px;border-left:1px solid var(--line)}
.steps .num{font:600 12px/1 var(--font);color:var(--subtle);letter-spacing:.06em}
.steps strong{display:block;margin:10px 0 6px;font-size:16.5px;font-weight:600;letter-spacing:-.01em}
.steps p{margin:0;color:var(--muted);font-size:15px}
.note{margin-top:56px;padding:22px 24px;border-radius:12px;background:var(--bg-2);color:var(--muted);font-size:15px}
.note strong{color:var(--text);font-weight:600}
.note p{margin:0}
.note p + p{margin-top:8px}

/* course layout */
.course-grid{display:grid;grid-template-columns:260px minmax(0,1fr);gap:56px;align-items:start;padding-top:48px}
.toc{position:sticky;top:88px}
.toc .progress{margin:0 0 18px}
.toc ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line)}
.toc a{display:flex;align-items:flex-start;gap:10px;padding:8px 0 8px 16px;margin-left:-1px;border-left:2px solid transparent;font-size:14.5px;line-height:1.4;color:var(--muted);transition:color .12s,border-color .12s}
.toc a:hover{color:var(--text)}
.toc a[aria-current="step"]{color:var(--text);font-weight:600;border-left-color:var(--accent)}
.toc .st{flex:none;display:grid;place-items:center;width:20px;height:20px;margin-top:-1px;border-radius:50%;border:1px solid var(--line-2);font:600 11px/1 var(--font);color:var(--subtle)}
.toc .done .st{background:var(--ok);border-color:var(--ok);color:var(--bg)}
.toc .locked .st,.toc-phone .locked .st{border-style:dashed}
.toc-phone{display:none}

/* lessons */
.view{max-width:760px;outline:none}
.js .view:not(.current){display:none}
.no-js .view + .view{margin-top:72px;padding-top:56px;border-top:1px solid var(--line)}
.view h2{margin:8px 0 14px;font-size:clamp(26px,3vw,36px);line-height:1.12;letter-spacing:-.03em;font-weight:600;scroll-margin-top:96px}
.view h3{margin:40px 0 10px;font-size:19px;line-height:1.3;letter-spacing:-.015em;font-weight:600}
.view p,.view li{color:var(--muted)}
.view p{margin:0 0 14px}
.view strong{color:var(--text);font-weight:600}
.view ul.points,.view ol.points{margin:0 0 14px;padding-left:20px}
.view .points li{margin:6px 0;padding-left:4px}
.view .points li::marker{color:var(--subtle)}
.intro{font-size:18px;line-height:1.55}
.done-flag{display:inline-flex;align-items:center;gap:8px;margin:0 0 6px;padding:6px 12px;border-radius:99px;background:var(--ok-soft);color:var(--ok);font-size:13.5px;font-weight:600}
.done-flag .icon{width:15px;height:15px}
figure{margin:24px 0}
figure img{width:100%;height:auto;border-radius:10px;box-shadow:0 0 0 1px var(--line);background:#fff}
figure.dark img{background:#000}
figcaption{margin-top:10px;font-size:14px;color:var(--subtle)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.two figure{margin:0}
.warn{margin:24px 0;padding:20px 22px;border-radius:12px;border:1px solid var(--line-2);background:var(--bg-2)}
.warn-tag{display:inline-flex;align-items:center;gap:10px;background:var(--yellow);color:#000;font:700 12px/1 var(--font);letter-spacing:.12em;text-transform:uppercase;padding:8px 12px;border-radius:3px}
.warn-tag svg{width:16px;height:16px;stroke:#000;stroke-width:2}
.warn p{margin:12px 0 0}
.manual-links{margin:28px 0 0;padding:16px 0 0;border-top:1px solid var(--line);font-size:14.5px;color:var(--subtle)}
.manual-links a{color:var(--text);border-bottom:1px solid var(--line-2)}
.manual-links a:hover{color:var(--accent);border-color:var(--accent)}
.manual-links .sep{margin:0 8px;opacity:.5}

/* video: a local thumbnail until the visitor presses play, so nothing loads from YouTube before that */
.video{position:relative;margin:24px 0 8px;aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#000;box-shadow:0 0 0 1px var(--line)}
.video img{width:100%;height:100%;object-fit:cover;opacity:.9;transition:opacity .2s,transform .35s}
.video button{position:absolute;inset:0;z-index:1;display:grid;place-items:center;width:100%;border:0;padding:0;background:transparent;cursor:pointer}
.video .play{display:grid;place-items:center;width:72px;height:72px;border-radius:50%;background:rgba(255,255,255,.94);color:#0a0a0c;box-shadow:0 10px 40px rgba(0,0,0,.45);transition:transform .15s}
.video .play svg{width:28px;height:28px;margin-left:4px;fill:currentColor;stroke:none}
.video button:hover .play,.video button:focus-visible .play{transform:scale(1.07)}
.video button:hover + img,.video button:focus-visible + img{opacity:1}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-meta{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 16px;font-size:14px;color:var(--subtle)}
.video-meta a{color:var(--muted);border-bottom:1px solid var(--line-2)}
.video-meta a:hover{color:var(--text)}

/* checks, ordering and scenarios */
.practice{margin-top:44px;padding-top:8px}
.practice > h3:first-child{margin-top:0}
.check{margin:0 0 18px;padding:20px 22px;border:1px solid var(--line-2);border-radius:12px;min-width:0}
.check legend{float:left;width:100%;margin:0 0 12px;padding:0;font-weight:600;color:var(--text);line-height:1.45}
.check legend + *{clear:both}
.check .qn{display:block;margin-bottom:4px;font:600 11.5px/1.4 var(--font);letter-spacing:.09em;text-transform:uppercase;color:var(--subtle)}
.opt{display:flex;align-items:flex-start;gap:12px;margin:6px 0 0;padding:11px 14px;border-radius:8px;border:1px solid var(--line);cursor:pointer;color:var(--text);transition:border-color .12s,background .12s}
.opt:hover{border-color:var(--line-2);background:var(--bg-2)}
.opt input{flex:none;width:18px;height:18px;margin:3px 0 0;accent-color:var(--accent)}
.opt.right{border-color:var(--ok);background:var(--ok-soft)}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.feedback{margin:12px 0 0;font-size:15px}
.feedback:empty{display:none}
.feedback .verdict{font-weight:600}
.is-right .verdict{color:var(--ok)}
.is-wrong .verdict{color:var(--bad)}
.order{margin:0 0 18px;padding:20px 22px;border:1px solid var(--line-2);border-radius:12px}
.order .task{margin:0 0 12px;font-weight:600;color:var(--text)}
.order ol{list-style:none;margin:0;padding:0;counter-reset:step}
.order li{display:flex;align-items:center;gap:12px;margin:6px 0 0;padding:8px 8px 8px 14px;border-radius:8px;border:1px solid var(--line);color:var(--text);counter-increment:step;transition:border-color .12s,background .12s}
.order li::before{content:counter(step);flex:none;display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--bg-2);font:600 12px/1 var(--font);color:var(--muted)}
.order li span{flex:1;min-width:0}
.order li.right{border-color:var(--ok);background:var(--ok-soft)}
.order li.wrong{border-color:var(--bad);background:var(--bad-soft)}
.order .mv{flex:none;display:flex;gap:4px}
.order .mv button{display:grid;place-items:center;width:44px;height:44px;border-radius:8px;border:1px solid var(--line);background:var(--bg);cursor:pointer;color:var(--muted)}
.order .mv button:hover{border-color:var(--line-2);color:var(--text)}
.order .mv button[disabled]{opacity:.3;cursor:default}
.order .mv svg{width:16px;height:16px}
.no-js .order .mv{display:none}
.scenarios{display:grid;gap:14px;margin:0 0 18px}
.scenario{padding:20px 22px;border:1px solid var(--line-2);border-radius:12px}
.scenario p.s{margin:0 0 14px;color:var(--text)}
.scenario .choices{display:flex;flex-wrap:wrap;gap:8px}
.scenario .choices .btn[aria-pressed="true"].right{border-color:var(--ok);background:var(--ok-soft);color:var(--ok)}
.scenario .choices .btn[aria-pressed="true"].wrong{border-color:var(--bad);background:var(--bad-soft);color:var(--bad)}
.lesson-done{margin:28px 0 0;padding:18px 20px;border-radius:12px;background:var(--ok-soft);color:var(--text)}
.lesson-done strong{color:var(--ok)}
.pager{display:flex;justify-content:space-between;gap:12px;margin-top:40px;padding-top:24px;border-top:1px solid var(--line)}
.pager a{display:flex;flex-direction:column;gap:2px;max-width:48%;font-size:15px;font-weight:600}
.pager a span{font:600 11.5px/1.4 var(--font);letter-spacing:.09em;text-transform:uppercase;color:var(--subtle)}
.pager a:hover{color:var(--accent)}
.pager .next{margin-left:auto;text-align:right;align-items:flex-end}

/* "In the US" and similar side notes inside a lesson */
.view .note{margin:16px 0;padding:14px 18px;border-radius:10px;font-size:15px}
.two > div p{margin-bottom:6px}

/* checklist */
.checklist{list-style:none;margin:16px 0 0;padding:0;border-top:1px solid var(--line)}
.checklist li{display:flex;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);color:var(--text)}
.checklist li::before{content:"";flex:none;width:18px;height:18px;margin-top:3px;border-radius:4px;border:1.5px solid var(--line-2)}
.checklist li span{color:var(--muted)}
.checklist li > div{min-width:0}

/* final quiz + certificate */
.locked-msg{padding:20px 22px;border-radius:12px;background:var(--bg-2)}
.locked-msg ul{margin:10px 0 0;padding-left:20px}
.result{margin:0 0 24px;padding:22px 24px;border-radius:12px}
.result.pass{background:var(--ok-soft)}
.result.fail{background:var(--bad-soft)}
.result h3{margin:0 0 6px}
.result p{margin:0}
.cert-form{display:flex;flex-wrap:wrap;align-items:flex-end;gap:12px;margin:20px 0 6px}
.cert-form label{display:block;flex:1 1 260px}
.cert-form label span{display:block;margin-bottom:6px;font-size:14px;font-weight:600;color:var(--text)}
.cert-form input{width:100%;min-height:46px;padding:0 14px;border-radius:8px;border:1px solid var(--line-2);background:var(--bg);font-size:17px}
.cert-form input:focus-visible{outline-offset:1px}
.hint{font-size:14px;color:var(--subtle)}
.cert-preview{margin:24px 0 0}
.cert-preview canvas{display:block;width:100%;height:auto;border-radius:6px;box-shadow:0 0 0 1px var(--line),var(--shadow);background:#fff}
.small{font-size:14px;color:var(--subtle)}

@media (max-width:1000px){
  .nav{display:none}
  .menu{display:block}
  .course-grid{grid-template-columns:minmax(0,1fr);gap:0;padding-top:28px}
  .toc{display:none}
  .toc-phone{display:block;margin:0 0 28px;border:1px solid var(--line-2);border-radius:12px}
  .toc-phone summary{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:52px;padding:0 18px;cursor:pointer;list-style:none;font-weight:600}
  .toc-phone summary::-webkit-details-marker{display:none}
  .toc-phone summary .small{font-weight:500}
  .toc-phone .inner{padding:0 18px 14px}
  .toc-phone .progress{margin:0 0 12px}
  .toc-phone ol{border-left:1px solid var(--line)}
  .toc-phone ol{list-style:none;margin:0;padding:0}
  .toc-phone a{display:flex;align-items:flex-start;gap:10px;padding:9px 0 9px 14px;margin-left:-1px;border-left:2px solid transparent;font-size:15px;line-height:1.4;color:var(--muted)}
  .toc-phone a[aria-current="step"]{color:var(--text);font-weight:600;border-left-color:var(--accent)}
  .toc-phone .st{flex:none;display:grid;place-items:center;width:20px;height:20px;border-radius:50%;border:1px solid var(--line-2);font:600 11px/1 var(--font);color:var(--subtle)}
  .toc-phone .done .st{background:var(--ok);border-color:var(--ok);color:var(--bg)}
  .card{grid-template-columns:1fr}
  .card-img{min-height:240px}
}
@media (max-width:640px){
  .container{padding-left:16px;padding-right:16px}
  .site-header .container{gap:12px}
  .wordmark{width:116px}
  .brand{gap:10px}
  .brand-name{font-size:13.5px}
  .hero .container{padding-top:44px;padding-bottom:40px}
  .hero .lead,.intro{font-size:16.5px}
  .card-body{padding:26px 22px}
  .steps{grid-template-columns:1fr}
  .steps li,.steps li + li{padding:18px 0 4px;border-left:0}
  .steps li + li{border-top:1px solid var(--line)}
  .two{grid-template-columns:1fr}
  .check,.order,.scenario{padding:16px}
  .order li{padding-left:10px;gap:8px}
  .pager a{font-size:14.5px}
  .site-footer .copy{margin-left:0}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* Printing: the checklist button prints only the checklist; otherwise print the current lesson without the chrome. */
@media print{
  .site-header,.site-footer,.toc,.toc-phone,.pager,.practice,.video,.video-meta,.btn-row,.skip{display:none!important}
  body{background:#fff;color:#000}
  .course-grid{display:block;padding:0}
  .view p,.view li{color:#000}
  body.print-checklist .hero,body.print-checklist .no-js-only,body.print-checklist .view:not(.current),body.print-checklist .view.current > :not(.checklist-block){display:none!important}
}