/* AICode - shared styles for the statically precomposed header. */

/* ========== NAVIGATION ROOT ========== */
/* common.js owns the scroll-state background and the burger open/close state. */
/* The markup intentionally keeps a single language selector and a single nav list.
   Desktop shows them inline, while mobile reuses the exact same nodes inside a fullscreen sheet. */
nav.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  height: 64px;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(11, 11, 11, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background 0.3s;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex: 0 0 auto;
  font-family: "Manrope", sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--text);
}

.nav-logo svg,
.logo-svg {
  width: 28px;
  height: 28px;
  color: #e78229;
  /* brand orange logo mark */
}

/* This wrapper is the single source of truth for both the desktop inline controls
   and the mobile fullscreen sheet. */
.nav-panel {
  margin-left: auto;
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
}

/* Mobile needs the language selector first inside the sheet, but desktop still wants
   the nav links visually before the selector. CSS order handles both with one DOM tree. */
.lang-switcher {
  order: 2;
  flex: 0 0 auto;
  margin-left: auto;
  position: relative;
  z-index: 1;
}

.nav-links {
  order: 1;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  min-width: max-content;
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links li {
  flex: 0 0 auto;
}

.nav-links a {
  display: block;
  padding: 0.2rem 0.4rem;
  font-size: 0.88rem;
  color: var(--text-dim);
  border-radius: 3px;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-cta {
  flex: 0 0 auto;
  margin-left: 0.25rem;
  padding: 0.5rem 1.2rem !important;
  font-size: 0.85rem !important;
  position: relative;
  z-index: 1;
}

/* ========== LANG SWITCHER ========== */
.lang-switcher select {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 4px 8px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.lang-switcher select:hover {
  border-color: var(--accent);
  color: var(--text);
}

.lang-switcher select option {
  background: var(--bg2);
  color: var(--text);
}

/* ========== MOBILE BURGER ========== */
/* The burger lives in the DOM on every page, but CSS keeps it out of the desktop flow. */
.nav-toggle {
  display: none;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  padding: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition:
    border-color 0.2s,
    background 0.2s,
    color 0.2s;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--accent);
  background: var(--accent-glow);
  color: var(--accent-soft);
}

.nav-toggle:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 0.2rem;
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition:
    transform 0.22s ease,
    opacity 0.18s ease,
    background 0.18s ease;
}

.nav-toggle-bar + .nav-toggle-bar {
  margin-top: 0;
}

/* Mobile blocks the document scroll while the fullscreen sheet is open, otherwise
   the page would continue moving behind the fixed panel. */
body.has-mobile-nav-open {
  overflow: hidden;
}

/* ========== MOBILE SHEET ========== */
@media (max-width: 600px) {
  nav.site-nav {
    padding: 0 1rem;
    gap: 0.75rem;
  }

  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
    position: relative;
    z-index: 2;
  }

  .nav-logo {
    position: relative;
    z-index: 2;
  }

  /* The shared panel becomes a fullscreen sheet under the fixed header, keeping the
     same selector and links but changing only their layout and interaction surface. */
  .nav-panel {
    position: fixed;
    inset: 0;
    z-index: 1;
    width: 100vw;
    min-height: 100dvh;
    box-sizing: border-box;
    margin-left: 0;
    padding: calc(64px + 1.25rem) 1rem
      max(2rem, env(safe-area-inset-bottom, 0rem));
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 1.5rem;
    overflow-y: auto;
    background: rgba(11, 11, 11, 1);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-100%);
    transition:
      transform 0.28s cubic-bezier(0.22, 0.61, 0.36, 1),
      opacity 0.22s ease,
      visibility 0s linear 0.28s;
  }

  nav.site-nav.is-mobile-nav-open .nav-panel {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
    transition:
      transform 0.28s cubic-bezier(0.22, 0.61, 0.36, 1),
      opacity 0.22s ease,
      visibility 0s;
  }

  .lang-switcher {
    order: 1;
    width: 100%;
  }

  .lang-switcher select {
    width: min(12rem, 100%);
    padding: 0.72rem 2.5rem 0.72rem 0.9rem;
    font-size: 0.92rem;
    background: var(--bg2);
  }

  .nav-links {
    order: 2;
    position: static;
    left: auto;
    transform: none;
    width: 100%;
    min-width: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    width: 100%;
    padding: 0.65rem 0;
    font-size: 1.15rem;
    border-radius: 0;
  }

  /* The icon transitions into a close glyph so the same button both opens and closes
     the sheet without introducing a second control in the header. */
  nav.site-nav.is-mobile-nav-open .nav-toggle {
    border-color: var(--accent);
    background: var(--accent-glow);
    color: var(--accent-soft);
  }

  nav.site-nav.is-mobile-nav-open .nav-toggle-bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  nav.site-nav.is-mobile-nav-open .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  nav.site-nav.is-mobile-nav-open .nav-toggle-bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}