/* Dental Hygienics training sites: shared styles.
   Layout: white logo header, red hero, sticky section nav, animated guided tutorial, lessons with official videos,
   reference tables, troubleshooting, searchable video library, official docs. */
:root{
  --bg:#ffffff; --surface:#f6f6f7; --surface2:#ececee; --fg:#333333; --muted:#6a6a70; --line:#dadada;
  --red:#cb2531; --red-dark:#a81f29; --on-red:#ffffff; --navy:#1d4354; --good:#1f7a4d; --tint:#fdeeef; --warn:#fff7e0; --warnline:#e0a800;
  --font:'Open Sans',system-ui,-apple-system,'Segoe UI',Arial,sans-serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#18181a; --surface:#222225; --surface2:#2d2d31; --fg:#ececee; --muted:#a2a2aa; --line:#3a3a3f;
  --red:#e5434e; --red-dark:#a81f29; --navy:#7fb4cc; --good:#4cc38a; --tint:#3a2226; --warn:#33290d; --warnline:#e0a800; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#18181a; --surface:#222225; --surface2:#2d2d31; --fg:#ececee; --muted:#a2a2aa; --line:#3a3a3f;
  --red:#e5434e; --red-dark:#a81f29; --navy:#7fb4cc; --good:#4cc38a; --tint:#3a2226; --warn:#33290d; --warnline:#e0a800; color-scheme:dark}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:64px}
body{background:var(--bg);color:var(--fg);font-family:var(--font);font-size:15px;line-height:1.55;margin:0}
a{color:var(--red)}
.wrap{max-width:1120px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
header.top{background:#fff;border-bottom:1px solid #dadada}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:12px;padding-bottom:12px;flex-wrap:wrap}
header.top img{height:44px;width:auto;display:block}
header.top span{color:#6a6a70;font-size:13px}
.btn{display:inline-block;background:var(--red);color:#fff;font:inherit;font-weight:700;padding:10px 18px;border-radius:4px;text-decoration:none;border:0;cursor:pointer}
.btn:hover{background:var(--red-dark)}
.btn.light{background:#fff;color:var(--red-dark)}
.btn.ghost{background:transparent;color:#fff;border:2px solid #fff}
.hero{background:var(--red-dark);color:#fff}
.hero .wrap{padding-top:40px;padding-bottom:36px;display:grid;grid-template-columns:1.5fr 1fr;gap:32px;align-items:center}
.hero h1{font-size:clamp(28px,4.4vw,44px);line-height:1.1;margin:0 0 12px;font-weight:800;text-wrap:balance}
.hero p{margin:0 0 18px;max-width:58ch;font-size:16.5px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.stat{display:grid;gap:10px}
.stat div{background:rgba(255,255,255,.13);border-radius:6px;padding:10px 16px}
.stat b{display:block;font-size:22px;font-weight:800;line-height:1.15}
.stat span{font-size:13px;opacity:.92}
nav.sticky{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--line)}
nav.sticky .wrap{display:flex;gap:6px;overflow-x:auto;padding-top:8px;padding-bottom:8px;scrollbar-width:thin}
nav.sticky a{flex:none;text-decoration:none;color:var(--fg);font-weight:600;font-size:14px;padding:6px 13px;border-radius:999px;border:1.5px solid var(--line)}
nav.sticky a:hover{border-color:var(--red)}
nav.sticky a.on{background:var(--red);border-color:var(--red);color:#fff}
section{padding-top:44px;padding-bottom:44px}
section.alt{background:var(--surface)}
h2{font-size:clamp(22px,3vw,30px);margin:0 0 6px;font-weight:800;text-wrap:balance}
h2 .r{color:var(--red)}
h3{font-size:17px;margin:0 0 8px;font-weight:700}
.lead{color:var(--muted);margin:0 0 22px;max-width:72ch}
.flow{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin:0;padding:0;list-style:none;counter-reset:s}
.flow li{counter-increment:s;background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:12px;position:relative}
.flow li:before{content:counter(s);display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--red);color:#fff;font-weight:800;font-size:13px;margin-bottom:6px}
.flow b{display:block}
.flow span{color:var(--muted);font-size:13px}
.lesson{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:26px;align-items:start}
.steps{counter-reset:st;list-style:none;margin:0 0 14px;padding:0}
.steps li{counter-increment:st;padding:0 0 10px 38px;position:relative}
.steps li:before{content:counter(st);position:absolute;left:0;top:0;width:26px;height:26px;border-radius:50%;background:var(--red);color:#fff;font-weight:800;font-size:13px;display:grid;place-items:center}
.why{background:var(--bg);border:1px solid var(--line);border-left:4px solid var(--red);border-radius:6px;padding:10px 14px;margin:0 0 14px}
.tip,.warn{border-radius:6px;padding:9px 13px;margin:0 0 10px;font-size:14px}
.tip{background:var(--warn);border-left:4px solid var(--warnline)}
.warn{background:var(--tint);border-left:4px solid var(--red)}
.vids{display:grid;gap:14px}
.vids.two{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.vids figure{margin:0}
.yt{position:relative;display:block;width:100%;padding:0;border:0;cursor:pointer;aspect-ratio:16/9;border-radius:8px;overflow:hidden;background:#111}
.yt img{width:100%;height:100%;object-fit:cover;display:block;opacity:.85}
.yt:hover img{opacity:1}
.yt .play{position:absolute;inset:0;margin:auto;width:60px;height:42px;border-radius:10px;background:var(--red);color:#fff;display:grid;place-items:center;font-size:20px}
.yt iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.vids figcaption{font-size:13px;color:var(--muted);margin-top:4px}
.vids figcaption b{color:var(--fg)}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px;background:var(--bg)}
table{border-collapse:collapse;width:100%;font-size:14px;min-width:560px}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--surface2);font-weight:700}
tr:last-child td{border-bottom:0}
.sw{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:6px;vertical-align:-1px;border:1px solid rgba(0,0,0,.2)}
details{background:var(--bg);border:1px solid var(--line);border-radius:8px;margin-bottom:8px}
summary{cursor:pointer;font-weight:700;padding:11px 14px;list-style:none;display:flex;justify-content:space-between;gap:10px}
summary::after{content:"+";color:var(--red);font-size:20px;line-height:1}
details[open] summary::after{content:"\2212"}
details>div{padding:0 14px 12px}
details ul{margin:0;padding-left:20px}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:14px}
.chip{font:inherit;font-size:14px;font-weight:600;padding:7px 14px;border-radius:999px;border:1.5px solid var(--line);background:var(--bg);color:var(--fg);cursor:pointer}
.chip[aria-pressed="true"]{background:var(--red);border-color:var(--red);color:#fff}
input[type=search]{font:inherit;padding:8px 12px;border:1.5px solid var(--line);border-radius:6px;background:var(--bg);color:var(--fg);min-width:200px;flex:1;max-width:320px}
.vgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
.vcard{display:flex;flex-direction:column;gap:2px;text-decoration:none;color:var(--fg);background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:10px 12px}
.vcard:hover{border-color:var(--red)}
.vcard b{font-size:14px}
.vcard small{color:var(--muted)}
.vcard em{font-style:normal;color:var(--red);font-size:12px;font-weight:700;margin-top:2px}
.none{color:var(--muted);display:none}
.links{columns:2 320px;column-gap:28px;margin:0;padding-left:18px}
.links li{margin-bottom:6px;break-inside:avoid}
.links small{color:var(--muted)}
.cards3{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}
.card{background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:14px 16px}
.card ul,.card ol{margin:0;padding-left:20px}
h3.sub{font-size:21px;margin:34px 0 12px;padding-top:6px;border-top:2px solid var(--line);scroll-margin-top:70px}
h3.sub:first-of-type{margin-top:14px;border-top:0}
.tablewrap{margin-top:14px}
.card li{margin-bottom:4px}
footer{background:var(--surface2);padding-top:24px;padding-bottom:28px;font-size:13px;color:var(--muted)}
footer img{height:34px;display:block;margin-bottom:8px;background:#fff;padding:2px 6px;border-radius:4px}
.totop{position:fixed;right:16px;bottom:16px;z-index:30;display:none}

/* ---- Animated guided tutorial ---- */
.wk-grid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:24px;align-items:start}
.stage{position:relative;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;color:#222;height:400px;box-shadow:0 4px 18px rgba(0,0,0,.08);font-size:13px;line-height:1.4}
.bar{height:34px;background:#eceef1;display:flex;align-items:center;gap:6px;padding:0 10px;border-bottom:1px solid #d9dce1}
.bar i{width:10px;height:10px;border-radius:50%;background:#c9cdd3;flex:none}
.bar .url{margin-left:8px;flex:1;background:#fff;border-radius:999px;height:22px;display:flex;align-items:center;padding:0 12px;color:#555;font-size:12px;overflow:hidden;white-space:nowrap}
.screen{position:absolute;inset:34px 0 0 0;padding:16px 18px;opacity:0;pointer-events:none;transition:opacity .35s;overflow:hidden;background:#fff}
.screen.on{opacity:1}
.screen.dk{background:#1f2430;color:#e8eaf0}
.mt{text-align:center;font-weight:700;font-size:16px;margin:0 0 12px}
.mb{display:inline-block;background:#2d6df6;color:#fff;border-radius:5px;padding:6px 14px;font-weight:600;font-size:12.5px}
.mb.grey{background:#e4e6ea;color:#333}
.mb.dkb{background:#323949;color:#d5d9e4}
.mb.sm{padding:4px 10px;font-size:11.5px}
.frow{margin-bottom:9px}
.frow label{display:block;font-size:11.5px;color:#555;margin-bottom:2px;font-weight:600}
.dk .frow label{color:#aab1c2}
.inp{min-height:28px;border:1px solid #c5c9d0;border-radius:5px;padding:5px 8px;background:#fff;color:#222;font-size:12.5px;overflow:hidden;white-space:nowrap}
.inp:empty::before{content:attr(data-ph);color:#aaa}
.inp.focus{border-color:#2d6df6;box-shadow:0 0 0 3px rgba(45,109,246,.22)}
.inp.typing::after{content:"";display:inline-block;width:1px;height:13px;background:#333;margin-left:1px;vertical-align:-2px;animation:blink .7s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.bar-ph{height:28px;border-radius:5px;background:#e6e8ec}
.dk .bar-ph{background:#323949}
.rv{opacity:0;transition:opacity .35s}.rv.show{opacity:1}
.ok{color:#1f7a4d;font-weight:600;font-size:12px}
.dk .ok{color:#59d39b}
.pop{position:absolute;inset:0;background:rgba(0,0,0,.45);display:grid;place-items:center;opacity:0;pointer-events:none;transition:opacity .3s;z-index:3}
.pop.show{opacity:1}
.pop>div{background:#fff;color:#222;border-radius:10px;padding:16px 20px;text-align:center;width:min(280px,86%);box-shadow:0 6px 24px rgba(0,0,0,.25)}
.center{text-align:center}
.cursor{position:absolute;left:0;top:0;width:22px;height:22px;z-index:9;pointer-events:none;transition:transform .9s cubic-bezier(.45,.05,.25,1);filter:drop-shadow(0 2px 2px rgba(0,0,0,.35));opacity:0}
.cursor.vis{opacity:1}
.ripple{position:absolute;width:30px;height:30px;margin:-15px 0 0 -15px;border-radius:50%;background:rgba(203,37,49,.4);z-index:8;pointer-events:none;transform:scale(0);opacity:0}
.ripple.go{animation:rip .5s ease-out}
@keyframes rip{0%{transform:scale(.2);opacity:.9}100%{transform:scale(1.6);opacity:0}}
.hl{outline:3px solid #ffb400;outline-offset:2px;animation:pulse 1s ease-in-out infinite;border-radius:6px}
@keyframes pulse{50%{outline-color:rgba(255,180,0,.35)}}
.caption{margin-top:10px;background:var(--bg);border:1px solid var(--line);border-left:4px solid var(--red);border-radius:6px;padding:10px 14px;min-height:64px}
.ctrl{display:flex;gap:8px;align-items:center;margin-top:10px;flex-wrap:wrap}
.ctrl button{font:inherit;font-weight:700;font-size:14px;border:1.5px solid var(--line);background:var(--bg);color:var(--fg);border-radius:6px;padding:6px 12px;cursor:pointer}
.ctrl button:hover{border-color:var(--red)}
.ctrl .prog{flex:1;min-width:80px;height:6px;border-radius:3px;background:var(--surface2);overflow:hidden}
.ctrl .prog i{display:block;height:100%;width:0;background:var(--red);transition:width .4s}
.wsteps{list-style:none;margin:0;padding:0;display:grid;gap:8px;counter-reset:w}
.wsteps li{counter-increment:w}
.wsteps button{width:100%;text-align:left;font:inherit;background:var(--bg);color:var(--fg);border:1px solid var(--line);border-radius:8px;padding:9px 12px 9px 44px;position:relative;cursor:pointer}
.wsteps button:before{content:counter(w);position:absolute;left:10px;top:9px;width:24px;height:24px;border-radius:50%;background:var(--surface2);font-weight:800;font-size:13px;display:grid;place-items:center}
.wsteps button b{display:block;font-size:14.5px}
.wsteps button span{display:block;color:var(--muted);font-size:13px}
.wsteps button.on{border-color:var(--red);background:var(--tint)}
.wsteps button.on:before{background:var(--red);color:#fff}
.wsteps button.past:before{background:var(--good);color:#fff;content:"\2713"}
.illus{color:var(--muted);font-size:12.5px;margin:8px 0 0}

/* ScanFlow-style mock (Dexis) */
.wf{display:flex;gap:6px;justify-content:center;margin-bottom:8px}
.wf span{padding:3px 12px;border-radius:999px;background:#323949;font-size:11.5px;font-weight:600;color:#9aa3b8}
.wf span.on{background:#2d6df6;color:#fff}
.jaws{position:absolute;left:14px;bottom:12px;display:grid;gap:5px}
.jaws span{padding:3px 10px;border-radius:5px;background:#323949;font-size:11.5px;color:#9aa3b8;font-weight:600}
.jaws span.on{background:#2d6df6;color:#fff}
.arch{display:block;margin:0 auto;width:min(290px,78%);height:auto}
.arch .base{fill:none;stroke:#3a4256;stroke-width:24;stroke-linecap:round;stroke-dasharray:3 5}
.draw{fill:none;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset 2s linear}
.draw.show{stroke-dashoffset:0}
.draw.occ{stroke:#f1ead8;stroke-width:22}
.draw.lin{stroke:#59d39b;stroke-width:7}
.draw.buc{stroke:#6aa8ff;stroke-width:7}
.scanlbl{position:absolute;right:14px;bottom:12px;background:#323949;border-radius:6px;padding:5px 10px;font-size:12px;font-weight:600;max-width:55%}
.legend{position:absolute;right:14px;top:44px;display:grid;gap:3px;font-size:11px;color:#c9cfdd}
.legend i{display:inline-block;width:14px;height:5px;border-radius:3px;margin-right:5px;vertical-align:2px}
.bite{width:min(300px,84%);margin:14px auto 0;position:relative}
.bite .row{display:grid;grid-template-columns:repeat(8,1fr);gap:3px}
.bite .row b{height:34px;background:#f1ead8;border-radius:5px 5px 9px 9px}
.bite .row.lo b{border-radius:9px 9px 5px 5px;margin-top:2px}
.bdot{position:absolute;top:22px;width:22px;height:22px;border-radius:50%;background:#59d39b;color:#10311f;font-weight:800;font-size:12px;display:grid;place-items:center;transform:scale(0);transition:transform .3s}
.bdot.show{transform:scale(1)}
.tiles{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin-bottom:12px}
.tiles span{background:#323949;border-radius:6px;padding:8px 4px;text-align:center;font-size:11px;font-weight:600;color:#c9cfdd}
.tiles span.on{background:#2d6df6;color:#fff}
.partner{display:flex;align-items:center;gap:10px;background:#2a3040;border:1px solid #3a4256;border-radius:8px;padding:10px 12px;margin-bottom:12px}
.partner .av{width:34px;height:34px;border-radius:50%;background:#59607a;display:grid;place-items:center;font-weight:800}
.partner .tick{margin-left:auto;color:#59d39b;font-weight:800;font-size:18px}
.pcard{background:#2a3040;border:1px solid #3a4256;border-radius:8px;padding:10px 12px;margin-top:10px}
.pbtns{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.solid .draw{transition:none}

/* VistaScan / VistaSoft mock (Durr) */
.scene{position:relative;height:250px;margin-top:4px}
.plate{position:absolute;width:74px;height:98px;border-radius:9px;background:#fff;border:1.5px solid #9aa0aa;display:grid;place-items:center;font-size:11px;font-weight:700;color:#555;text-align:center;transition:transform 1.2s ease,opacity .4s}
.plate.blue{background:#bfe0f5;border-color:#6fa9cc;color:#1d4354}
.cover{position:absolute;width:92px;height:118px;border-radius:8px;border:2px solid #333;border-top-style:dashed;background:rgba(40,40,40,.08)}
.flaptxt{position:absolute;font-size:12px;font-weight:700;color:#1f7a4d}
.lbl{position:absolute;font-size:12px;color:#444;max-width:150px}
.lbl b{color:#222}
.tube{position:absolute;left:14px;top:70px;width:92px;height:62px;border-radius:8px 30px 30px 8px;background:#5b6474;color:#fff;display:grid;place-items:center;font-size:11.5px;font-weight:700}
.rays{position:absolute;left:112px;top:84px;font-size:22px;letter-spacing:6px;color:#e0a800}
.badge{position:absolute;background:#fff7e0;border:1px solid #e0a800;border-radius:6px;padding:5px 10px;font-size:12px;font-weight:700;color:#5c4500}
.wipe{position:absolute;width:54px;height:40px;border-radius:6px;background:#d7ecff;border:1.5px solid #7fb4e0;display:grid;place-items:center;font-size:10.5px;font-weight:700;color:#1d4354;transition:transform 1.4s ease}
.ticks{position:absolute;right:8px;top:6px;display:grid;gap:7px;font-size:12.5px;width:52%}
.ticks span{background:#f1f3f6;border-radius:6px;padding:6px 10px}
.vsbar{display:flex;gap:6px;align-items:center;background:#27323d;margin:-16px -18px 10px;padding:8px 12px}
.vsbar span{background:#3b4a58;color:#dfe7ee;border-radius:5px;padding:4px 10px;font-size:11.5px;font-weight:600}
.vsbar .sp{margin-left:auto;background:none;color:#9fb0bf}
.pbar{background:#eef2f5;border-radius:6px;padding:6px 10px;font-size:12px;margin-bottom:8px;min-height:30px}
.res{border:1px solid #d9dce1;border-radius:6px;padding:6px 10px;font-size:12.5px;margin-top:6px;display:flex;justify-content:space-between}
.prev{border:1px dashed #9aa0aa;border-radius:8px;height:120px;display:grid;place-items:center;color:#667;font-weight:600;text-align:center;position:relative;overflow:hidden}
.xr{position:absolute;inset:0;background:linear-gradient(180deg,#0d0f12,#3a3f47 55%,#15171b);display:flex;align-items:flex-end;justify-content:center;gap:6px;padding-bottom:0}
.xr i{width:30px;height:74px;border-radius:14px 14px 4px 4px;background:linear-gradient(180deg,#f4f4f4,#aeb3bb)}
.xr i:nth-child(2){height:86px}.xr i:nth-child(3){height:80px}
.dose{display:inline-block;width:10px;height:36px;border-radius:3px;background:#1f9d5b;vertical-align:middle;margin-right:6px}
.scanner{position:absolute;left:50%;top:92px;width:190px;height:150px;margin-left:-95px;border-radius:14px;background:#eef0f3;border:2px solid #b9bfc9}
.scanner .slot{position:absolute;left:50%;top:-4px;width:96px;height:8px;margin-left:-48px;background:#333;border-radius:4px}
.scanner .disp{position:absolute;left:18px;right:18px;top:26px;height:54px;border-radius:8px;background:#151a22;color:#fff;font-size:11px;text-align:center;padding-top:8px}
.sbar{display:block;height:7px;border-radius:4px;background:#2d6df6;margin:0 14px 7px;transition:background .4s}
.sbar.show{background:#1fbf6b}
.scanner .tray{position:absolute;left:30px;right:30px;bottom:8px;height:26px;border-radius:0 0 10px 10px;border:2px solid #b9bfc9;border-top:0}
.drop{position:absolute;left:50%;top:205px;width:60px;height:14px;margin-left:-30px;border-radius:4px;background:#bfe0f5;border:1.5px solid #6fa9cc}

.chip:focus-visible,.btn:focus-visible,input:focus-visible,summary:focus-visible,nav a:focus-visible,.yt:focus-visible,.ctrl button:focus-visible,.wsteps button:focus-visible{outline:3px solid var(--navy);outline-offset:2px}
@media (max-width:860px){
  .hero .wrap,.lesson,.wk-grid{grid-template-columns:1fr}
  .stage{height:390px}
}
@media (prefers-reduced-motion:reduce){.cursor,.draw,.plate,.wipe,.bdot{transition:none}.hl{animation:none}.inp.typing::after{animation:none}}
@media print{
  nav.sticky,.totop,.cta,.toolbar,.ctrl{display:none!important}
  section{padding-top:16px;padding-bottom:16px}
  .hero{background:#fff!important;color:#000}
  .hero .stat div{border:1px solid #ccc;background:#fff}
}

/* Durr scene helpers */
.plate.p1.show{transform:translateY(120px)}
.plate.p5{z-index:1}
.plate.p5.show{transform:translateY(104px)}
.scanner{z-index:2}
.wipe.show{transform:translateX(120px)}
.grid2{display:grid;grid-template-columns:1fr 1.25fr;gap:12px}
.thumb{width:64px;height:48px;border-radius:5px;background:linear-gradient(180deg,#0d0f12,#4a4f58);border:2px solid #2d6df6;margin-top:6px}