/* The product pages: landing, sign-in, dashboard, account, admin, legal.
 * NextAligner: deep navy for the name, headings and main buttons, teal for accents;
 * light by default, dark from the system preference or the toggle (data-theme on
 * <html>). Desktop only: the app pages are gated on phones and tablets; the landing
 * stays readable as one column on a narrow screen. */
@import url("/static/fonts/fonts.css");
:root{
  --bg:#f5f9fa; --panel:#fff; --ink:#0d2633; --muted:#5b7180; --line:#d6e4ea;
  --accent:#043d5d; --accent-ink:#fff; --accent-soft:#d9f2f1;
  --teal:#2fa9a5; --teal-ink:#0d2633; --navy:#043d5d;
  --warn:#b45309; --ok:#1a7f4b; --bad:#a33; --scene:#eef4f6;
  --radius:10px; --shadow:0 1px 2px rgba(4,61,93,.06),0 4px 16px rgba(4,61,93,.07);
  --font:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#071c27; --panel:#0c2734; --ink:#e6f1f4; --muted:#9db3bf; --line:#1f3d4c;
    --accent:#66c9c6; --accent-ink:#04212f; --accent-soft:#0f3a44;
    --teal:#66c9c6; --teal-ink:#04212f; --navy:#e6f1f4;
    --warn:#f0a050; --ok:#4cc38a; --bad:#f07878; --scene:#0a222e;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 6px 20px rgba(0,0,0,.35);
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#071c27; --panel:#0c2734; --ink:#e6f1f4; --muted:#9db3bf; --line:#1f3d4c;
  --accent:#66c9c6; --accent-ink:#04212f; --accent-soft:#0f3a44;
  --teal:#66c9c6; --teal-ink:#04212f; --navy:#e6f1f4;
  --warn:#f0a050; --ok:#4cc38a; --bad:#f07878; --scene:#0a222e;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 6px 20px rgba(0,0,0,.35);
  color-scheme:dark;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;background:var(--bg);color:var(--ink)}
body{font:15px/1.55 var(--font)}
a{color:var(--accent)}
h1,h2,h3{line-height:1.25}
.muted{color:var(--muted)}
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}

/* header */
.topbar{position:sticky;top:0;z-index:20;background:var(--panel);border-bottom:1px solid var(--line)}
.topbar .wrap{display:flex;align-items:center;gap:14px;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--ink);text-decoration:none}
.brand svg{flex:none}
.topbar nav{display:flex;gap:4px;margin-left:18px}
.topbar nav a{padding:7px 12px;border-radius:8px;color:var(--muted);text-decoration:none;font-weight:500}
.topbar nav a.on,.topbar nav a:hover{background:var(--accent-soft);color:var(--accent)}
.spacer{flex:1}

/* controls */
button,.btn{font:inherit;font-weight:600;border:1px solid var(--accent);background:var(--accent);
  color:var(--accent-ink);padding:9px 16px;border-radius:8px;cursor:pointer;text-decoration:none;
  display:inline-flex;align-items:center;gap:8px;line-height:1.2}
button:hover,.btn:hover{filter:brightness(1.07)}
button:disabled{opacity:.55;cursor:default;filter:none}
button.ghost,.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
button.ghost:hover,.btn.ghost:hover{background:var(--accent-soft);border-color:var(--accent-soft)}
button.linkish{background:none;border:0;color:var(--accent);padding:0;font-weight:500}
button.danger{background:var(--bad);border-color:var(--bad);color:#fff}
.btn.big,button.big{padding:13px 22px;font-size:16px;border-radius:10px}
input,select,textarea{font:inherit;color:var(--ink);background:var(--panel);border:1px solid var(--line);
  border-radius:8px;padding:9px 11px;width:100%}
input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:0;border-color:var(--accent)}
label{display:block;font-size:13px;font-weight:600;margin:12px 0 5px;color:var(--muted)}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.chip{display:inline-block;padding:2px 9px;border-radius:999px;font-size:12px;font-weight:600;
  background:var(--accent-soft);color:var(--accent)}

/* account menu */
.acct{position:relative}
.acct-btn{background:transparent;color:var(--ink);border:1px solid var(--line);font-weight:500;
  display:inline-flex;align-items:center;gap:6px;max-width:260px}
.acct-btn span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.acct-menu{position:absolute;right:0;top:calc(100% + 6px);min-width:220px;background:var(--panel);
  border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);padding:6px;display:none}
.acct-menu.open{display:block}
.acct-menu a,.acct-menu button{display:flex;width:100%;text-align:left;background:none;border:0;
  color:var(--ink);padding:8px 10px;border-radius:7px;font-weight:500;text-decoration:none}
.acct-menu a:hover,.acct-menu button:hover{background:var(--accent-soft)}
.acct-menu .who{padding:8px 10px;font-size:13px;color:var(--muted);border-bottom:1px solid var(--line);margin-bottom:4px}

/* modal (sign-in dialog) */
.authwrap{position:fixed;inset:0;background:rgba(10,14,20,.45);display:flex;align-items:center;
  justify-content:center;z-index:100;padding:20px}
.authwrap[hidden]{display:none}
.authcard{background:var(--panel);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);
  width:400px;max-width:100%;padding:26px 26px 20px}
.authcard h2{margin:0 0 4px;font-size:21px}
.authcard .sub{margin:0 0 6px;color:var(--muted);font-size:14px}
.authcard .row{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:18px;flex-wrap:wrap}
.authmsg{min-height:0;font-size:14px;margin-top:10px}
.authmsg.ok{color:var(--ok)} .authmsg.bad{color:var(--bad)}
.gbtn{display:flex;align-items:center;justify-content:center;gap:10px;border:1px solid var(--line);
  border-radius:8px;padding:10px;color:var(--ink);text-decoration:none;font-weight:600;margin-top:10px}
.gbtn:hover{background:var(--accent-soft)}
.gor{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13px;margin:14px 0 2px}
.gor::before,.gor::after{content:"";flex:1;border-top:1px solid var(--line)}
.hint{font-size:12px;color:var(--muted);margin-top:4px}

/* landing */
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;padding:64px 0 48px}
.kicker{color:var(--teal);font-weight:600;font-size:13px;letter-spacing:.12em;text-transform:uppercase;margin:0 0 12px}
.hero h1{font-size:44px;font-weight:800;margin:0 0 18px;letter-spacing:-.015em;color:var(--navy);text-wrap:balance}
.hero .lead{font-size:18px;color:var(--muted);margin:0 0 26px;max-width:60ch}
.cta{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.hero .note{font-size:13px;color:var(--muted);margin-top:14px;display:flex;align-items:center;gap:6px}
/* the real case in the hero (landing_demo.js) */
.demo-card{margin:0;background:var(--scene);border-radius:18px;border:1px solid var(--line);overflow:hidden;box-shadow:var(--shadow)}
.demo3d{position:relative;aspect-ratio:4/3;cursor:grab;touch-action:pan-y}
.demo3d:active{cursor:grabbing}
.demo3d .demo-poster,.demo3d canvas{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.demo3d.live .demo-poster{opacity:0;transition:opacity .4s;pointer-events:none}
.demo-ui{display:flex;align-items:center;gap:10px;padding:10px 14px;border-top:1px solid var(--line);background:var(--panel)}
.demo-ui input[type=range]{flex:1;min-width:80px;accent-color:var(--accent)}
.demo-play{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%;padding:0;
  border:1px solid var(--line);background:var(--panel);color:var(--accent);cursor:pointer;opacity:.35}
.demo3d.paused~.demo-ui .demo-play,.demo-card:has(.paused) .demo-play{opacity:1}
.demo-label{font-weight:600;font-size:14px;min-width:84px;font-variant-numeric:tabular-nums}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{border:0;background:transparent;color:var(--muted);padding:6px 10px;font:inherit;font-size:13px;cursor:pointer}
.seg button[aria-pressed=true]{background:var(--accent-soft);color:var(--accent);font-weight:600}
.demo-card figcaption{padding:0 14px 12px;background:var(--panel);font-size:13px;color:var(--muted)}
/* the case's own numbers */
.numbers{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;padding:8px 0 24px}
.numbers>div{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 20px}
.numbers b{display:block;font-size:30px;line-height:1.1;color:var(--ink);letter-spacing:-.01em}
.numbers span{color:var(--muted);font-size:14px}
.numbers-note{grid-column:1/-1;margin:0;font-size:13px;color:var(--muted)}
/* the process video */
.process-video{width:100%;height:auto;border-radius:14px;border:1px solid var(--line);background:#000;display:block;box-shadow:var(--shadow)}
.video-band h2{margin-bottom:6px!important}
.video-band p{margin:0 0 18px}
/* how it works, each step beside its screen */
.how{display:flex;flex-direction:column;gap:28px}
.how-row{display:grid;grid-template-columns:.8fr 1.2fr;gap:36px;align-items:center}
.how-row:nth-child(even) .how-text{order:2}
.how-n{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;
  background:var(--accent);color:var(--accent-ink);font-weight:700;margin-bottom:10px}
.how-text h3{margin:0 0 8px;font-size:20px}
.how-text p{margin:0;color:var(--muted);font-size:16px}
.how-full{margin:22px 0 0}
.shot-btn{display:block;padding:0;border:0;background:none;cursor:zoom-in;width:100%}
.shot{display:block;width:100%;height:auto;border-radius:12px;border:1px solid var(--line);box-shadow:var(--shadow)}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.gallery figure{margin:0}
.gallery figcaption{font-size:14px;color:var(--muted);margin-top:8px}
.lightbox{border:0;padding:0;background:transparent;max-width:min(1600px,96vw);max-height:96vh}
.lightbox::backdrop{background:rgba(8,10,14,.82)}
.lightbox img{display:block;max-width:100%;max-height:88vh;border-radius:10px}
.lightbox p{color:#fff;text-align:center;margin:10px 0 0}
.lb-close{position:absolute;top:8px;right:8px;width:38px;height:38px;border-radius:50%;border:0;background:rgba(0,0,0,.55);
  color:#fff;font-size:24px;line-height:1;cursor:pointer}
/* the CBCT case: roots in bone */
.ct-band{padding-top:56px}
.ct-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:40px;align-items:center}
.ct-text h2{font-size:28px!important;margin:0 0 16px!important}
.ct-points{grid-template-columns:1fr!important;margin-bottom:16px!important}
.ct-found{font-size:14px;line-height:1.5;border-left:3px solid var(--warn);padding-left:12px}
.demo-extra{border-top:0;padding-top:0;flex-wrap:wrap}
.demo-bone{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--muted);cursor:pointer}
.ct-key{display:inline-flex;align-items:center;gap:5px;font-size:12px;color:var(--muted);margin-left:auto}
.ct-key i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-left:6px}
.ct-key .k-ok{background:#f2ece1;border:1px solid var(--line)}
.ct-key .k-thin{background:#f0a040}
.ct-key .k-out{background:#e0453a}
.ct-pair{display:grid;grid-template-columns:repeat(2,minmax(0,280px)) 1fr;gap:20px;align-items:start;margin-top:28px}
.ct-pair figure{margin:0}
.ct-pair figcaption{font-size:14px;color:var(--muted);margin-top:8px;line-height:1.45}
.ct-shot{background:#000}
.ct-note{font-size:13px;margin:0;align-self:center}
.final-cta{text-align:center;background:var(--accent-soft);border-radius:18px;padding:44px 24px!important;margin:20px 0}
.final-cta p{color:var(--muted);font-size:17px;margin:0 0 20px}
section.band{padding:40px 0}
section.band h2{font-size:28px;font-weight:800;margin:0 0 20px;color:var(--navy);text-wrap:balance}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.steps .card{padding:22px}
.steps h3{margin:0 0 8px;font-size:17px}
.steps p{margin:0;color:var(--muted)}
.gets{display:grid;grid-template-columns:repeat(2,1fr);gap:12px 28px;list-style:none;padding:0;margin:0}
.gets li{display:flex;gap:10px;align-items:flex-start;font-size:16px}
.gets li::before{content:"";flex:none;width:20px;height:20px;margin-top:2px;border-radius:50%;
  background:var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232b6cb0' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center/13px no-repeat}
.privacy{padding:22px}
.privacy p{margin:0 0 8px;color:var(--muted)}
.disclaimer{font-size:13px;color:var(--muted);margin:22px 0 0}
footer.site{border-top:1px solid var(--line);margin-top:40px;padding:22px 0 34px;color:var(--muted);font-size:14px}
footer.site .wrap{display:flex;gap:18px;flex-wrap:wrap;align-items:center}
footer.site a{color:var(--muted)}
.handheld-note{display:none;background:var(--accent-soft);color:var(--ink);padding:12px 16px;border-radius:10px;margin:16px 0 0}
html.handheld .handheld-note{display:block}

/* legal + desktop-only pages */
.prose{max-width:760px;margin:40px auto;padding:0 24px}
.prose h1{font-size:30px}
.prose h2{font-size:19px;margin-top:28px}
.prose p,.prose li{color:var(--ink)}
.center-page{min-height:calc(100vh - 60px);display:flex;align-items:center;justify-content:center;padding:24px}
.center-page .card{max-width:460px;padding:28px;text-align:center}
.center-page h1{font-size:22px;margin:12px 0 8px}

/* small-window banner on desktop */
.small-window{display:none;position:fixed;bottom:14px;left:50%;transform:translateX(-50%);z-index:90;
  max-width:calc(100vw - 24px);text-align:center;
  background:var(--ink);color:var(--bg);padding:9px 16px;border-radius:999px;font-size:13px;box-shadow:var(--shadow)}
html.small .small-window{display:block}

@media (max-width:900px){
  .hero{grid-template-columns:1fr;padding:36px 0}
  .hero h1{font-size:32px}
  .steps,.gets,.how-row,.gallery,.ct-grid{grid-template-columns:1fr}
  .ct-pair{grid-template-columns:1fr 1fr}
  .ct-note{grid-column:1/-1}
  .how-row:nth-child(even) .how-text{order:0}
  .numbers{grid-template-columns:repeat(2,1fr)}
  .demo-ui{flex-wrap:wrap}
  .topbar nav{display:none}
}

/* a phone: the account button is its icon (a long email pushed the page past
   the screen's edge, 591 px wide on a 390 px phone) */
@media (max-width:600px){
  .acct-btn span{display:none}
  .topbar .wrap{gap:8px}
}

/* bilingual prose blocks (legal pages) */
html[lang="vi"] .l-en, html[lang="en"] .l-vi{display:none}

/* the brand: the mark (a force vector across the N) and the name in heavy capitals */
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand .wordmark{font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--navy);font-size:17px}
.brand .wordmark b{color:var(--teal);font-weight:800}

/* the biomechanics band: a tooth turning about its centre of resistance */
.bio-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:40px;align-items:center}
.bio-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:14px;min-width:0}
.bio-card canvas{display:block;width:100%;height:auto;aspect-ratio:4/3;max-width:100%}
.bio-read{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px}
.bio-read div{border:1px solid var(--line);border-radius:10px;padding:8px 10px;background:var(--bg)}
.bio-read b{display:block;font-size:17px;font-variant-numeric:tabular-nums;color:var(--ink)}
.bio-read span{font-size:12px;color:var(--muted)}
.bio-pillars{display:grid;gap:14px;margin:0;padding:0;list-style:none}
.bio-pillars li{display:grid;gap:2px;padding-left:16px;border-left:3px solid var(--teal)}
.bio-pillars b{color:var(--ink)}
.bio-pillars span{color:var(--muted);font-size:14px}
.bio-note{font-size:12px;color:var(--muted);margin:8px 2px 0}
@media (max-width:900px){ .bio-grid{grid-template-columns:1fr} .bio-read{grid-template-columns:1fr 1fr 1fr} }
.bio-3d{position:relative;width:100%;aspect-ratio:4/3;max-width:100%;cursor:grab;touch-action:pan-y}
.bio-3d canvas{display:block;width:100%;height:100%}
.bio-lbl{position:absolute;transform:translate(-50%,-50%);font-size:13px;font-weight:600;color:var(--ink);
  pointer-events:none;white-space:nowrap;text-shadow:0 0 4px var(--panel),0 0 8px var(--panel)}
.bio-lbl-crest,.bio-lbl-moment{font-weight:500;color:var(--muted)}
.bio-lbl-f{color:var(--teal);font-size:15px}