/* ═══════════════════════════════════════════════════════════════
   Aibilia — Shared Navigation Styles
   Used by: landing page, blog listing, blog posts
   ═══════════════════════════════════════════════════════════════ */

/* ─── Nav bar ────────────────────────────────────────────────── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  padding: 1rem 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
  backdrop-filter: blur(20px);
  background: rgba(12,11,14,0.8);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition);
}
html.light nav { background: rgba(246,243,237,0.85); }

.nav-logo {
  font-size: 1.1rem; font-weight: 600; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--text); text-decoration: none;
  transition: color var(--transition);
}
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a {
  font-size: 0.875rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-secondary); text-decoration: none;
  transition: color 0.3s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* ─── Language selector ──────────────────────────────────────── */
.lang-selector { position: relative; }
.lang-btn {
  background: none; border: none; cursor: pointer;
  font-size: 1.4rem; line-height: 1; padding: 4px 6px;
  border-radius: 3px; transition: background 0.2s;
  width: 36px; text-align: center;
}
.lang-btn:hover { background: var(--accent-soft); }
.lang-dropdown {
  position: absolute; top: calc(100% + 8px); right: 0;
  background: var(--bg-card); border: 1px solid var(--border-hover);
  border-radius: 4px; padding: 4px 0; min-width: 140px;
  opacity: 0; pointer-events: none; transform: translateY(-4px);
  transition: opacity 0.2s ease, transform 0.2s ease; z-index: 300;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.lang-selector.open .lang-dropdown {
  opacity: 1; pointer-events: all; transform: translateY(0);
}
.lang-option {
  display: flex; align-items: center; gap: 0.5rem; width: 100%;
  padding: 0.45rem 0.8rem; border: none; background: none;
  font-family: var(--font); font-size: 0.875rem; color: var(--text-secondary);
  cursor: pointer; text-align: left; letter-spacing: 0.03em;
  transition: background 0.15s, color 0.15s;
}
.lang-option:hover { background: var(--accent-soft); color: var(--text); }
.lang-option span { font-size: 1rem; }

/* ─── Theme toggle ───────────────────────────────────────────── */
.mode-wrap { display: flex; align-items: center; gap: 6px; }
.mode-icon {
  width: 16px; height: 16px; display: inline-block;
  color: var(--accent); transition: color 0.3s;
}
html.light .mode-icon { color: #1a1714; }
.mode-icon svg { width: 100%; height: 100%; fill: currentColor; }
.mode-toggle {
  width: 48px; height: 26px; border-radius: 13px; cursor: pointer;
  background: var(--border); border: 1px solid var(--border-hover);
  position: relative; transition: background 0.3s, border-color 0.3s;
}
.mode-toggle::after {
  content: ''; position: absolute; top: 3px; left: 3px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); transition: transform 0.3s;
}
html.light .mode-toggle::after { transform: translateX(22px); }

/* ─── Hamburger ──────────────────────────────────────────────── */
.hamburger {
  display: none; background: none; border: none; cursor: pointer;
  width: 44px; height: 44px; position: relative; z-index: 201;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.hamburger span {
  display: block; width: 22px; height: 2px; background: var(--text);
  border-radius: 1px; transition: transform 0.3s, opacity 0.3s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── Mobile menu overlay ────────────────────────────────────── */
.mobile-menu {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  z-index: 199; background: var(--bg);
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease;
}
.mobile-menu.open { opacity: 1; pointer-events: all; }
.mobile-menu-inner {
  display: flex; flex-direction: column; justify-content: center;
  height: 100%; padding: 5rem 2rem 3rem;
}
.mobile-menu-links {
  display: flex; flex-direction: column; gap: 0.25rem; margin-bottom: 3rem;
}
.mobile-menu-links a {
  font-size: 1.5rem; font-weight: 300; letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--text-secondary); text-decoration: none; padding: 0.75rem 0;
  border-bottom: 1px solid var(--border); transition: color 0.3s;
}
.mobile-menu-links a:hover, .mobile-menu-links a.active { color: var(--accent); }
.mobile-menu-controls { display: flex; flex-direction: column; gap: 1.5rem; }
.mobile-menu-control { display: flex; flex-direction: column; gap: 0.5rem; }
.mobile-menu-label {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.15em;
  color: var(--text-muted); font-weight: 500;
}
.mobile-lang-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.mobile-lang-option {
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.5rem 0.8rem; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 4px; font-family: var(--font); font-size: 0.85rem;
  color: var(--text-secondary); cursor: pointer; transition: all 0.2s;
}
.mobile-lang-option:hover, .mobile-lang-option.active {
  border-color: var(--accent); color: var(--accent); background: var(--accent-soft);
}
.mobile-theme-toggle {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.6rem 1rem; background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 4px; font-family: var(--font); font-size: 0.9rem;
  color: var(--text-secondary); cursor: pointer; transition: all 0.2s; width: fit-content;
}
.mobile-theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ─── Footer (shared across all pages) ───────────────────────── */
footer {
  padding: 3rem 2rem; font-size: 0.875rem; color: var(--text-muted);
  border-top: 1px solid var(--border);
  transition: color var(--transition);
}
footer a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
footer a:hover { opacity: 0.8; }
.footer-grid {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 2rem; align-items: start;
}
.footer-left { text-align: left; }
.footer-center { display: flex; gap: 1.5rem; align-items: center; justify-content: center; }
.footer-right { text-align: right; }
.footer-vat { margin-top: 0.3rem; opacity: 0.6; }
.btn-link {
  color: var(--accent); font-weight: 600; text-decoration: none;
  border-bottom: 1px solid var(--accent-soft); padding-bottom: 1px;
}

/* ─── Mobile responsive ──────────────────────────────────────── */
@media (max-width: 640px) {
  nav { padding: 0.75rem 1rem; }
  .nav-logo { font-size: 0.95rem; letter-spacing: 0.15em; min-height: 44px; display: flex; align-items: center; }
  .nav-links { display: none !important; }
  .hamburger { display: flex; }
  .mobile-menu { display: block; }
  .footer-grid { grid-template-columns: 1fr; text-align: center; gap: 1.2rem; }
  .footer-left, .footer-right { text-align: center; }
  .footer-center { justify-content: center; }
}