/* ==========================================================
   Sticky header + navigation
   Dark and seamless over the hero; turns into a frosted bar
   once the page scrolls (js/components/nav.js adds .scrolled).
   ========================================================== */
header.top{
  --h-bg:var(--hero-bg);
  --h-solid:var(--hero-bg);
  --h-text:#fff;
  --h-muted:#A9C9CD;
  --h-line:rgba(255,255,255,.12);
  --h-pill:rgba(255,255,255,.06);
  position:sticky;top:0;z-index:40;
  background:var(--h-bg);
  border-bottom:1px solid transparent;
  transition:background .3s ease,border-color .3s ease,box-shadow .3s ease;
}
header.top.scrolled{
  --h-bg:color-mix(in srgb,var(--bg) 86%,transparent);
  --h-solid:var(--bg);
  --h-text:var(--text);
  --h-muted:var(--muted);
  --h-line:var(--line);
  --h-pill:var(--surface);
  -webkit-backdrop-filter:saturate(1.4) blur(14px);
  backdrop-filter:saturate(1.4) blur(14px);
  border-bottom-color:var(--line);
  box-shadow:0 12px 30px -24px rgba(8,30,38,.55);
}
.top .wrap{position:relative;display:flex;align-items:center;gap:12px;height:72px}
.top .brand{color:var(--h-text);transition:color .3s}

/* Desktop navigation: links inside one soft pill */
nav.links{display:flex;align-items:center;gap:2px;margin-inline:auto;padding:5px;border-radius:999px;background:var(--h-pill);border:1px solid var(--h-line);transition:background .3s,border-color .3s}
nav.links a:not(.btn){text-decoration:none;font-size:14.5px;font-weight:500;line-height:1;padding:10px 13px;border-radius:999px;color:var(--h-muted);white-space:nowrap;transition:color .2s,background .2s}
nav.links a:not(.btn):hover{color:var(--h-text);background:color-mix(in srgb,var(--teal) 14%,transparent)}
nav.links a[aria-current="true"]{color:#fff;background:var(--teal)}
nav.links a[aria-current="true"]:hover{color:#fff;background:var(--teal-ink)}
.nav-cta{display:none}

/* Register button */
.top-cta{white-space:nowrap;padding:11px 18px 11px 20px;font-size:14.5px;box-shadow:0 10px 22px -12px rgba(22,166,161,.9)}
.top-cta svg{transition:transform .2s ease}
.top-cta:hover svg{transform:translateX(3px)}
html[dir="rtl"] .top-cta svg{transform:scaleX(-1)}
html[dir="rtl"] .top-cta:hover svg{transform:scaleX(-1) translateX(3px)}

/* Hamburger that turns into an X */
.menu-btn{display:none;position:relative;flex:none;width:44px;height:44px;border-radius:12px;border:1px solid var(--h-line);background:var(--h-pill);color:var(--h-text);cursor:pointer}
.menu-btn span{position:absolute;inset-inline:12px;height:2px;border-radius:2px;background:currentColor;transition:transform .25s ease,opacity .2s ease}
.menu-btn span:nth-child(1){top:15px}
.menu-btn span:nth-child(2){top:21px}
.menu-btn span:nth-child(3){top:27px}
.menu-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.menu-btn[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-btn[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* Thin reading-progress line under the header */
.scroll-progress{position:absolute;inset-inline:0;bottom:-1px;height:2px;background:linear-gradient(90deg,var(--teal),#7FD6D2);transform:scaleX(var(--progress,0));transform-origin:left;pointer-events:none}
html[dir="rtl"] .scroll-progress{transform-origin:right}

/* Language switcher: follows the header's dark/frosted colours */
.lang{display:flex;flex:none;gap:2px;border:1px solid var(--h-line);border-radius:999px;padding:3px;background:var(--h-pill);transition:background .3s,border-color .3s}
.lang button{border:0;background:none;color:var(--h-muted);font:inherit;font-size:13px;font-weight:600;line-height:1;padding:7px 11px;border-radius:999px;cursor:pointer;transition:color .2s,background .2s}
.lang button:hover{color:var(--h-text)}
.lang button[aria-pressed="true"]{background:var(--teal);color:#fff}
.lang button[data-lang="ku"],.lang button[data-lang="ar"]{font-family:var(--font-rtl)}

/* Small laptops: the bar has to hold the logo, seven links, the register
   button, three languages and the theme button, so it tightens in two steps */
@media (max-width:1180px){
  nav.links a:not(.btn){padding:10px 11px;font-size:14px}
}
@media (max-width:1120px){
  .top .wrap{gap:10px}
  nav.links a:not(.btn){padding:10px 8px;font-size:13.5px}
  .top-cta{padding:10px 14px 10px 16px;font-size:14px}
  .lang button{padding:7px 8px;font-size:12.5px}
}

/* Tablet and phone: slide-down menu panel */
@media (max-width:1060px){
  nav.links{position:absolute;top:calc(100% + 1px);inset-inline:0;margin:0;flex-direction:column;align-items:stretch;gap:4px;padding:14px 24px 22px;border-radius:0 0 var(--r-lg) var(--r-lg);border:0;border-bottom:1px solid var(--h-line);background:var(--h-solid);box-shadow:0 24px 40px -28px rgba(8,30,38,.6);opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .2s ease,transform .2s ease,visibility .2s}
  nav.links.open{opacity:1;visibility:visible;transform:none}
  nav.links a:not(.btn){font-size:17px;padding:14px 16px;border-radius:12px}
  .nav-cta{display:flex;margin-top:10px;padding:14px}
  .top-cta{margin-inline-start:auto}
  .menu-btn{display:block}
}
@media (max-width:560px){
  .top .wrap{height:64px;gap:10px}
  .top-cta{display:none}
  .lang{margin-inline-start:auto;padding:2px;gap:0}
  .lang button{padding:6px 8px;font-size:12.5px}
  .menu-btn{margin-inline-start:0}
  nav.links{padding-inline:16px}
}
/* Three languages plus the menu button are tight on a small phone. */
/* The smallest phones (under 400px): the tooth alone stands for iSmile, the
   big title is right below, so every control still fits on one line. */
@media (max-width:400px){
  .top .wrap{gap:8px;padding-inline:16px}
  .top .brand span{display:none}
}
@media (max-width:420px){
  .brand{font-size:19px;gap:8px}
  .brand svg{width:30px;height:34px}
  .lang button{padding:6px 7px;font-size:12px}
  .menu-btn{width:40px;height:40px}
}
@media (prefers-reduced-motion: reduce){
  header.top,nav.links,.menu-btn span,.top-cta svg{transition:none}
}

/* Light / dark switch */
.theme-btn{flex:none;display:grid;place-items:center;width:38px;height:38px;border-radius:12px;border:1px solid var(--h-line);background:var(--h-pill);color:var(--h-text);cursor:pointer;transition:background .2s ease,border-color .2s ease,color .2s ease}
.theme-btn:hover{background:color-mix(in srgb,var(--teal) 22%,transparent);border-color:color-mix(in srgb,var(--teal) 60%,transparent)}
.theme-btn svg{width:18px;height:18px}
.theme-btn .ico-sun{display:none}
.theme-btn[data-now="dark"] .ico-sun{display:block}
.theme-btn[data-now="dark"] .ico-moon{display:none}
@media (max-width:420px){
  .theme-btn{width:34px;height:34px;border-radius:10px}
  .theme-btn svg{width:16px;height:16px}
}

/* Tablets and phones are touch screens: thumb-sized language buttons */
@media (max-width:1060px){
  .lang button{min-height:36px;min-width:34px}
}

/* ---------- Phones: every width from 280px up ----------
   The language buttons are tall enough to tap with a thumb (36px), and on the
   narrowest phones the spacing tightens so logo, languages, theme and menu
   always fit on one line without the page scrolling sideways. */
@media (max-width:560px){
  .top .brand{min-height:40px}
  .lang button{min-height:36px;padding:0 9px}
  .theme-btn,.menu-btn{width:40px;height:40px}
}
@media (max-width:360px){
  .top .wrap{gap:6px;padding-inline:12px}
  .lang button{padding:0 7px;font-size:12px}
  .brand svg{width:28px;height:32px}
}
@media (max-width:320px){
  .top .wrap{gap:4px;padding-inline:10px}
  .lang{padding:1px}
  .lang button{padding:0 5px;font-size:11.5px}
  .theme-btn{width:36px;height:36px}
  .menu-btn{width:38px;height:38px}
}