/* ══════════════════════════════════════════════════════
   global.css
   Single source of truth for the site header and
   cross-browser normalization. Loaded on every page.
══════════════════════════════════════════════════════ */

/* ── Browser normalization ──────────────────────────
   Prevents Chrome/Safari from auto-inflating text on
   mobile and normalizes button/form rendering across
   Blink, Gecko, and WebKit.
──────────────────────────────────────────────────── */
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* ── Global reset ────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

img { display: block; max-width: 100%; }

/* All form controls inherit the page font so Chrome's
   UA stylesheet doesn't inject its own sizing. */
button,
input,
select,
textarea {
  font: inherit;
}

/* Strip Chrome/Safari's native button chrome so the
   toggle renders identically across browsers. */
button {
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  border-radius: 0;
}

/* ── Site-wide variables ─────────────────────────── */
:root {
  --site-header-height:        72px;
  --site-header-height-mobile: 60px;
  --site-max-width:            1280px;
}

/* ══════════════════════════════════════════════════
   SITE HEADER
   Height is fixed by three properties (height +
   min-height + max-height) so no child — font, icon,
   or button — can stretch it. Vertical padding is
   never used to create height.
══════════════════════════════════════════════════ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  height:     var(--site-header-height);
  min-height: var(--site-header-height);
  max-height: var(--site-header-height);
  z-index: 1000;
  background: rgba(6, 6, 6, 0.90);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.site-header__inner {
  height:     var(--site-header-height);
  min-height: var(--site-header-height);
  max-height: var(--site-header-height);
  max-width: var(--site-max-width);
  margin: 0 auto;
  /* padding-block: 0 ensures no vertical padding creates height */
  padding-block:  0;
  padding-inline: clamp(1rem, 3vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ── Brand ───────────────────────────────────────── */
.site-header__brand {
  font-size: clamp(1.1rem, 1.25vw, 1.35rem);
  font-family: 'Share Tech Mono', ui-monospace, 'Courier New', monospace;
  line-height: 1;
  white-space: nowrap;
  text-decoration: none;
  color: #f0f0f0;
  letter-spacing: 2px;
  text-transform: uppercase;
  transition: color 0.2s;
}

.site-header__brand:hover { color: #ffffff; }

/* ── Desktop nav ─────────────────────────────────── */
.site-header__nav {
  display: flex;
  align-items: center;
  gap: clamp(0.875rem, 1.6vw, 1.375rem);
}

.site-header__nav a {
  font-size: clamp(0.72rem, 0.82vw, 0.86rem);
  font-family: 'Share Tech Mono', ui-monospace, 'Courier New', monospace;
  line-height: 1;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: rgba(240, 240, 240, 0.52);
  transition: color 0.2s;
  position: relative;
}

.site-header__nav a:hover,
.site-header__nav a[aria-current="page"] {
  color: #f0f0f0;
}

.site-header__nav a[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

/* ── Hamburger toggle ────────────────────────────── */
/* Hidden on desktop; exact dimensions prevent it from
   stretching the header in any browser. */
.site-header__toggle {
  display: none;
  width:  42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0;
  line-height: 1;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: #f0f0f0;
  font-size: 18px;
  transition: border-color 0.2s;
  flex-shrink: 0;
}

.site-header__toggle:hover { border-color: rgba(255, 255, 255, 0.48); }

/* ── Mobile drawer ───────────────────────────────── */
/* top pins exactly to the mobile header height so the
   drawer opens flush regardless of browser. */
.site-header__mobile {
  display: none;
  position: fixed;
  top: var(--site-header-height-mobile);
  left: 0;
  right: 0;
  background: rgba(6, 6, 6, 0.97);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 10px 24px 16px;
  z-index: 999;
}

.site-header__mobile.is-open { display: block; }

.site-header__mobile a {
  display: block;
  padding: 11px 0;
  font-size: 13px;
  font-family: 'Share Tech Mono', ui-monospace, 'Courier New', monospace;
  line-height: 1;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  text-decoration: none;
  color: rgba(240, 240, 240, 0.56);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: color 0.2s;
}

.site-header__mobile a:last-child { border-bottom: none; }

.site-header__mobile a:hover,
.site-header__mobile a[aria-current="page"] { color: #f0f0f0; }

/* ── Mobile breakpoint ───────────────────────────── */
@media (max-width: 860px) {
  .site-header,
  .site-header__inner {
    height:     var(--site-header-height-mobile);
    min-height: var(--site-header-height-mobile);
    max-height: var(--site-header-height-mobile);
  }

  .site-header__nav { display: none; }

  .site-header__toggle {
    display: inline-flex;
  }
}

/* ── Focus rings ─────────────────────────────────── */
.site-header__brand:focus-visible,
.site-header__nav a:focus-visible,
.site-header__toggle:focus-visible,
.site-header__mobile a:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.65);
  outline-offset: 3px;
}