/* =========================================================================
   Chrome — nav, footer, language switcher, welcome screen
   ========================================================================= */

/* ---------- Top navigation ---------- */
.site-nav{
  position:sticky; top:0; z-index:60;
  background:linear-gradient(oklch(0 0 0 / .10), oklch(0 0 0 / .10)), var(--accent-ink);
  backdrop-filter:blur(14px) saturate(1.2);
  border-bottom:1px solid oklch(1 0 0 / .12);
  transition:border-color .4s, background .4s, box-shadow .4s;
}
.site-nav.scrolled{ border-color:oklch(1 0 0 / .16); box-shadow:0 2px 22px oklch(0 0 0 / .22); }
.site-nav .btn-primary{ background:#fff; color:var(--accent-ink); }
.site-nav .btn-primary:hover{ background:oklch(0.97 0.012 90); color:var(--accent-ink); }
.nav-inner{
  max-width:var(--maxw); margin-inline:auto; padding:14px var(--gutter);
  display:flex; align-items:center; justify-content:space-between; gap:24px;
}
.brand{ display:flex; align-items:center; gap:12px; }
.brand-mark{
  width:44px; height:44px; border-radius:50%; flex:none; overflow:hidden;
  background:#fff var(--brand-logo, none) center / 125% no-repeat;
  box-shadow:0 2px 8px oklch(0 0 0 / .18);
}
.brand-mark svg{ display:none; }
.brand-txt b{ font-family:var(--ff-display); font-weight:600; font-size:1.04rem; letter-spacing:.01em; display:block; line-height:1.1; white-space:nowrap; color:#fff; }
.brand-txt small{ font-family:var(--ff-mono); font-size:.58rem; letter-spacing:.2em; text-transform:uppercase; color:oklch(1 0 0 / .7); display:block; margin-top:3px; }

.nav-links{ display:flex; align-items:center; gap:4px; }
.nav-links a{
  font-size:.92rem; font-weight:500; color:oklch(1 0 0 / .82);
  padding:.55em .85em; border-radius:100px; position:relative;
  transition:color .25s, background .25s;
}
.nav-links a:hover{ color:#fff; background:oklch(1 0 0 / .14); }
.nav-links a.active{ color:#fff; }
.nav-links a.active::after{
  content:""; position:absolute; left:50%; bottom:2px; transform:translateX(-50%);
  width:5px; height:5px; border-radius:50%; background:#fff;
}
.nav-cta{ display:flex; align-items:center; gap:10px; }

.nav-burger{ display:none; width:44px; height:44px; border:1px solid oklch(1 0 0 / .3); border-radius:12px; background:oklch(1 0 0 / .1); position:relative; }
.nav-burger span,.nav-burger span::before,.nav-burger span::after{
  content:""; position:absolute; left:50%; top:50%; width:18px; height:2px; background:#fff;
  transform:translate(-50%,-50%); transition:.3s;
}
.nav-burger span::before{ transform:translate(-50%,-7px); }
.nav-burger span::after{ transform:translate(-50%,5px); }
.nav-burger.open span{ background:transparent; }
.nav-burger.open span::before{ transform:translate(-50%,-50%) rotate(45deg); }
.nav-burger.open span::after{ transform:translate(-50%,-50%) rotate(-45deg); }

@media (max-width:1080px){
  .nav-burger{ display:block; }
  .nav-links{
    position:fixed; inset:64px 0 auto 0; flex-direction:column; align-items:stretch; gap:2px;
    background:var(--accent-ink); padding:18px var(--gutter) 28px; border-bottom:1px solid oklch(1 0 0 / .14);
    transform:translateY(-12px); opacity:0; pointer-events:none; transition:.35s var(--ease);
    box-shadow:var(--shadow-md);
  }
  .nav-links.open{ transform:none; opacity:1; pointer-events:auto; }
  .nav-links a{ padding:.85em 1em; font-size:1.05rem; }
  .nav-cta .btn-primary{ display:none; }
}

/* ---------- Footer ---------- */
.site-foot{ background:var(--slate-900); color:var(--sand-50); padding-block:clamp(56px,7vw,88px) 28px; }
.site-foot a{ color:var(--sand-100); opacity:.82; transition:opacity .25s; }
.site-foot a:hover{ opacity:1; }
.foot-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1.1fr; gap:40px; }
.foot-grid h4{ color:var(--sand-300); font-family:var(--ff-mono); font-size:.72rem; letter-spacing:.2em; text-transform:uppercase; font-weight:700; margin-bottom:18px; }
.foot-brand b{ font-family:var(--ff-display); font-size:1.6rem; display:block; margin-bottom:10px; }
.foot-col p, .foot-col a{ font-size:.92rem; line-height:1.9; display:block; color:oklch(0.9 0.01 84 / .8); }
.foot-bottom{ margin-top:48px; padding-top:22px; border-top:1px solid oklch(1 0 0 / .12);
  display:flex; flex-wrap:wrap; gap:14px; justify-content:space-between; align-items:center;
  font-size:.8rem; color:oklch(0.85 0.01 84 / .6); font-family:var(--ff-mono); letter-spacing:.04em; }
@media (max-width:820px){ .foot-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .foot-grid{ grid-template-columns:1fr; } }

/* ---------- Flags ---------- */
.flag{ width:22px; height:15px; border-radius:3px; flex:none; box-shadow:inset 0 0 0 1px oklch(0 0 0 / .12); position:relative; overflow:hidden; }
.flag-gb{ background:#0a2767 !important; }
.flag-gb::before{ content:""; position:absolute; inset:0; background:
  linear-gradient(0deg, transparent calc(50% - 2px), #fff calc(50% - 2px) calc(50% + 2px), transparent calc(50% + 2px)),
  linear-gradient(90deg, transparent calc(50% - 2px), #fff calc(50% - 2px) calc(50% + 2px), transparent calc(50% + 2px)); }
.flag-gb::after{ content:""; position:absolute; inset:0; background:
  linear-gradient(0deg, transparent calc(50% - 1px), #c8332b calc(50% - 1px) calc(50% + 1px), transparent calc(50% + 1px)),
  linear-gradient(90deg, transparent calc(50% - 1px), #c8332b calc(50% - 1px) calc(50% + 1px), transparent calc(50% + 1px)); }

/* ---------- Language switcher (persistent) ---------- */
.lang-switch{ position:fixed; top:14px; right:var(--gutter); z-index:80; }
.lang-toggle{
  display:flex; align-items:center; gap:8px; padding:7px 12px; border-radius:100px;
  background:oklch(1 0 0 / .9); backdrop-filter:blur(10px); border:1px solid var(--line);
  box-shadow:var(--shadow-sm); font-family:var(--ff-mono); font-size:.74rem; font-weight:700;
  letter-spacing:.06em; color:var(--ink); transition:transform .25s, box-shadow .25s;
}
.lang-toggle:hover{ transform:translateY(-1px); box-shadow:var(--shadow-md); }
.lang-menu{
  position:absolute; top:calc(100% + 8px); right:0; min-width:172px;
  background:var(--paper); border:1px solid var(--line); border-radius:16px; padding:6px;
  box-shadow:var(--shadow-lg); display:flex; flex-direction:column; gap:2px;
  opacity:0; transform:translateY(-8px) scale(.97); transform-origin:top right;
  pointer-events:none; transition:.28s var(--ease-out);
}
.lang-switch.open .lang-menu{ opacity:1; transform:none; pointer-events:auto; }
.lang-chip{
  display:flex; align-items:center; gap:10px; padding:.6em .7em; border:0; border-radius:10px;
  background:transparent; font-family:var(--ff-body); font-size:.9rem; font-weight:500; color:var(--slate-700);
  text-align:left; transition:background .2s, color .2s;
}
.lang-chip:hover{ background:var(--sand-100); color:var(--ink); }
.lang-chip.active{ background:var(--slate-900); color:var(--sand-50); }

@media (max-width:1080px){ .lang-switch{ top:11px; right:76px; } }

/* ---------- Welcome screen ---------- */
.lang-welcome{
  position:fixed; inset:0; z-index:200; display:grid; place-items:center;
  background:
    radial-gradient(120% 80% at 50% -10%, var(--sand-100), transparent 60%),
    var(--slate-900);
  opacity:0; transition:opacity .7s var(--ease);
}
.lang-welcome.show{ opacity:1; }
.lang-welcome.hide{ opacity:0; }
.lang-welcome-inner{ text-align:center; padding:32px; max-width:640px; transform:translateY(14px); transition:transform .8s var(--ease-out); }
.lang-welcome.show .lang-welcome-inner{ transform:none; }
.lw-eyebrow{ font-family:var(--ff-mono); font-size:.72rem; letter-spacing:.34em; text-transform:uppercase; color:var(--sand-300); margin-bottom:26px; }
.lw-mark{
  width:84px; height:84px; margin:0 auto 22px; border-radius:24px;
  background:linear-gradient(150deg, var(--sand-300), var(--sand-500));
  display:grid; place-items:center; box-shadow:0 20px 50px oklch(0.72 0.05 75 / .35);
}
.lw-mark span{ font-family:var(--ff-display); font-size:2.6rem; font-weight:600; color:var(--slate-900); }
.lw-title{ color:var(--sand-50); font-size:clamp(2.2rem,5vw,3.4rem); margin-bottom:14px; }
.lw-sub{ color:oklch(0.85 0.02 84 / .75); font-size:.92rem; margin-bottom:38px; letter-spacing:.02em; }
.lw-grid{ display:flex; flex-wrap:wrap; justify-content:center; gap:12px; }
.lw-opt{
  display:flex; align-items:center; gap:11px; padding:.85em 1.3em; border-radius:100px;
  background:oklch(1 0 0 / .06); border:1px solid oklch(1 0 0 / .14); color:var(--sand-50);
  font-family:var(--ff-body); font-size:1rem; font-weight:500;
  opacity:0; transform:translateY(16px); animation:lwIn .6s var(--ease-out) forwards; animation-delay:calc(var(--d) + .3s);
  transition:background .25s, transform .25s, border-color .25s;
}
.lw-opt .flag{ width:26px; height:18px; }
.lw-opt:hover{ background:oklch(1 0 0 / .14); border-color:var(--sand-300); transform:translateY(-2px); }
@keyframes lwIn{ to{ opacity:1; transform:none; } }
@media (prefers-reduced-motion: reduce){ .lw-opt{ opacity:1; transform:none; animation:none; } }

/* ---------- Tooth cursor (shared) ---------- */
.app-cursor{
  position:fixed; top:0; left:0; z-index:300; width:32px; height:32px; pointer-events:none;
  opacity:0; transition:opacity .3s; will-change:transform;
  filter:drop-shadow(0 4px 9px oklch(0.3 0.02 250 / .28));
}
.app-cursor svg{ width:100%; height:100%; transition:transform .16s var(--ease); transform-origin:center; }
.app-cursor.hot svg{ transform:scale(1.35) rotate(-7deg); }
.app-cursor.click svg{ transform:scale(1.5) rotate(6deg); }
@media (pointer:fine){
  html.tooth-on, html.tooth-on a, html.tooth-on button, html.tooth-on .faq-q,
  html.tooth-on .gtile, html.tooth-on .lang-chip, html.tooth-on label{ cursor:none; }
  html.tooth-on input, html.tooth-on textarea, html.tooth-on select{ cursor:text; }
}