شريط شفّاف يمتلئ

<div class="nb nbt">
  <header>
    <span class="brand"><span class="mk">✈</span><span data-ar="رحلات المها" data-en="Maha Travel">رحلات المها</span></span>
    <nav aria-label="الرئيسية">
      <a href="#" aria-current="page" data-ar="الوجهات" data-en="Destinations">الوجهات</a><a href="#" data-ar="العروض" data-en="Offers">العروض</a><a href="#" data-ar="الرحلات" data-en="Trips">الرحلات</a>
    </nav>
    <span class="grow"></span>
    <button class="cta" data-ar="احجز الآن" data-en="Book now">احجز الآن</button>
  </header>
  <div class="scr">
    <div class="hero"><span data-ar="مرّر لترى الشريط يمتلئ" data-en="Scroll to see the bar fill">مرّر لترى الشريط يمتلئ</span></div>
    <div class="filler"></div>
  </div>
</div>

/* pt-scoped */
/* navbar-transparent — شركة سياحة · 48px */
.nbt{width:100%;height:100%;display:flex;flex-direction:column;
  font-size:10px;color:var(--pt-text-secondary);overflow:hidden;position:relative}
.nbt header{flex:none;display:flex;align-items:center;gap:9px;width:100%}
.nbt .brand{display:flex;align-items:center;gap:6px;font-weight:700;
  color:var(--pt-text-primary);white-space:nowrap}
.nbt .brand .mk{display:grid;place-items:center;flex:none;font-size:10px}
.nbt nav{display:flex;align-items:center;gap:2px;min-width:0}
.nbt nav a{padding:5px 8px;color:var(--pt-text-muted);white-space:nowrap;cursor:pointer;
  transition:color var(--pt-motion-duration-fast) var(--pt-motion-easing-standard),
             background var(--pt-motion-duration-fast) var(--pt-motion-easing-standard)}
.nbt nav a:hover{color:var(--pt-text-primary)}
.nbt .grow{flex:1}
.nbt .stage{flex:1;display:flex;flex-direction:column;gap:5px;padding:10px;min-height:0}
.nbt .stage h4{margin:0;font-size:10.5px;color:var(--pt-text-primary)}
.nbt .stage p{margin:0;font-size:8.5px;color:var(--pt-text-muted);line-height:1.8}
.nbt button{font:inherit;cursor:pointer}
.nbt a:focus-visible, .nbt button:focus-visible, .nbt input:focus-visible{
  outline:2px solid var(--pt-focus-ring);outline-offset:-1px}
.nbt{background:var(--pt-bg-base)}
.nbt header{position:absolute;inset-block-start:0;inset-inline:0;z-index:5;height:48px;
  padding:0 12px;background:transparent;
  transition:background var(--pt-motion-duration-normal) var(--pt-motion-easing-standard),
             box-shadow var(--pt-motion-duration-normal) var(--pt-motion-easing-standard)}
.nbt.filled header{background:var(--pt-surface);box-shadow:var(--pt-shadow-3)}
.nbt .brand{font-size:11px;color:#fff;text-shadow:0 1px 3px rgba(0,0,0,.55)}
.nbt.filled .brand{color:var(--pt-text-primary);text-shadow:none}
.nbt .brand .mk{width:19px;height:19px;font-size:12px}
.nbt nav{margin-inline-start:9px}
.nbt nav a{color:rgba(255,255,255,.86);text-shadow:0 1px 3px rgba(0,0,0,.5);
  border-radius:var(--pt-radius-full)}
.nbt.filled nav a{color:var(--pt-text-muted);text-shadow:none}
.nbt nav a[aria-current=page]{color:#fff;background:rgba(255,255,255,.18)}
.nbt.filled nav a[aria-current=page]{color:var(--pt-accent);background:var(--pt-bg-inset)}
.nbt .cta{padding:5px 12px;border-radius:var(--pt-radius-full);border:1px solid rgba(255,255,255,.5);
  background:rgba(255,255,255,.14);color:#fff;font-size:9px;font-weight:600;
  backdrop-filter:blur(3px)}
.nbt.filled .cta{border-color:transparent;background:var(--pt-accent);
  color:var(--pt-color-ink-900);backdrop-filter:none}
.nbt .scr{flex:1;overflow-y:auto}
.nbt .hero{height:120px;display:grid;place-items:center;font-size:9px;color:#fff;
  background:linear-gradient(140deg,#2a3f7a,#5b54a8 60%,#8f7bb8)}
.nbt .filler{height:260px;
  background:repeating-linear-gradient(180deg,var(--pt-bg-inset) 0 14px,transparent 14px 28px)}
@media(prefers-reduced-motion:reduce){.nbt header{transition:none}
}

/* يعمل داخل إطار معزول — لا يعتمد على شيء خارجه */
/* pt-remount — يعاد التركيب عند تبديل اللغة */
(function () {
  var host = document.querySelector('.nbt');
  if (!host) return;
  var snapshot = host.innerHTML;
  var timers = [];
  var ac = null;

  /* الجسم كما كتبه المولِّد. يستقبل بدائل مظلَّلة لـ root وdocument
     والمؤقّتات، فينظّف نفسه دون أن يعرف أنه قابل لإعادة التركيب. */
  function run(root, document, setTimeout, setInterval) {
    /* تفعيل الرابط الحالي — سلوك مشترك بين كل الأشرطة */
    var links = [].slice.call(root.querySelectorAll('nav a'));
    links.forEach(function (a) {
      a.addEventListener('click', function (e) {
        e.preventDefault();
        links.forEach(function (x) { x.removeAttribute('aria-current'); });
        a.setAttribute('aria-current', 'page');
      });
    });
    /* إغلاق أي قائمة مفتوحة بالهروب أو بالضغط خارجها */
    function autoClose(btn, panel, onToggle) {
      function set(v) {
        panel.hidden = !v;
        btn.setAttribute('aria-expanded', String(v));
        if (onToggle) onToggle(v);
      }
      btn.addEventListener('click', function (e) { e.stopPropagation(); set(panel.hidden); });
      panel.addEventListener('click', function (e) { e.stopPropagation(); });
      document.addEventListener('click', function () { if (!panel.hidden) set(false); });
      document.addEventListener('keydown', function (e) {
        if (e.key === 'Escape' && !panel.hidden) { set(false); btn.focus(); }
      });
      return set;
    }
    var scr = root.querySelector('.scr');
    scr.addEventListener('scroll', function () {
      root.classList.toggle('filled', scr.scrollTop > 70);
    }, { passive: true });
  }

  function mount() {
    ac = new AbortController();
    var real = window.document;
    /* وسيط يمرّر كل شيء إلى المستند الحقيقي، ويعلّق كل مستمع بإشارة
       تُقطع عند إعادة التركيب — فلا يبقى مستمع من نسخة ماتت. */
    var doc = new Proxy(real, {
      get: function (t, k) {
        if (k === 'addEventListener') {
          return function (type, fn, opts) {
            var o = (opts && typeof opts === 'object') ? Object.assign({}, opts)
                                                       : { capture: !!opts };
            o.signal = ac.signal;
            return t.addEventListener(type, fn, o);
          };
        }
        var v = t[k];
        return typeof v === 'function' ? v.bind(t) : v;
      }
    });
    function track(fn) {
      return function (f, ms) { var id = fn(f, ms); timers.push(id); return id; };
    }
    run(host, doc, track(window.setTimeout.bind(window)),
        track(window.setInterval.bind(window)));
  }

  function unmount() {
    if (ac) ac.abort();
    // المعرّفان يتشاركان فضاءً واحدًا في المتصفّح، فالإلغاء المزدوج آمن
    timers.forEach(function (id) { window.clearTimeout(id); window.clearInterval(id); });
    timers = [];
    host.innerHTML = snapshot;
  }

  mount();
  addEventListener('pt-lang', function () { unmount(); mount(); });
})();

# Transparent Navbar that Fills

**Role:** You are an Arabic-first UI designer and front-end engineer. Read the whole
specification before writing a single line, then follow it literally. If two requirements
conflict, favour usability over visual effect.

**Goal:** Transparent Navbar that Fills — Transparent over the hero, gains a background on scroll

**Why this component matters:** Transparent bars fail on light imagery. Give the text a shadow while transparent, and swap to a solid surface as soon as the hero scrolls away.

**Direction:** Genuine RTL — not a mirrored Latin layout. Use logical properties
(`margin-inline-start`, `padding-inline`, `inset-inline-start`, `text-align: start`),
never physical ones (`margin-left`, `left`). The layout must flip with `dir` on its own,
with no duplicated rules.

**Typography:** Cairo for Arabic, IBM Plex Sans for Latin. Arabic line-height must be
`0.18` higher than the Latin equivalent — dots, hamzas and maddas need more vertical room.
Arabic font-size runs `1.06×` the Latin size at the same optical weight.

**Numerals:** Western digits in both languages (`1,234.50`). Only the currency changes:
`ر.س` **after** the number in Arabic, `$` **before** it in English. Jordanian dinar
uses **three** decimal places, not two.

**Colors:** Dark mode — background `#0D142B` · surfaces `#211F54` · borders `#545C91` · text `#918FC2`.
Accent `#ADA9E8` must never exceed 8% of the screen area.

**Language:** Bilingual — every string carries both Arabic and English, and the layout
flips with `dir` automatically.

**States:** `default` · `hover` · `focus` · `active` · `disabled` · `loading` · `error`.
Do not design the resting state alone.

**Accessibility:** Contrast ratio at least `4.5:1`, complete keyboard navigation,
visible focus rings, and honour `prefers-reduced-motion`.

**Output:** Clean HTML and CSS in two separate files. No frameworks, no libraries,
no external dependencies.