/* ══════════════════════════════════════
   NAV — bar, mobile menu, theme toggle
══════════════════════════════════════ */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  height: 56px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 40px;
  background: var(--nav-bg);
  backdrop-filter: blur(30px) saturate(180%);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: all 0.5s var(--ease-smooth);
}
nav.scrolled { box-shadow: var(--shadow-sm); border-bottom-color: var(--border-hi); }
.logo {
  font-family: 'Outfit', sans-serif;
  font-size: 16px; font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text); text-decoration: none;
  transition: color 0.3s;
  display: flex; align-items: center; gap: 10px;
}
.logo-mark {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: none;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.logo-mark svg { width: 100%; height: 100%; }
.nav-links {
  position: absolute; left: 50%; transform: translateX(-50%);
  display: flex; gap: 28px; list-style: none;
}
.nav-links a {
  font-family: 'DM Sans', sans-serif;
  font-size: 13px; font-weight: 400;
  color: var(--text2); text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.3s var(--ease-smooth);
  position: relative;
}
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
  height: 1px; background: var(--amber);
  transform: scaleX(0); transform-origin: right;
  transition: transform 0.4s var(--ease-smooth);
}
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); transform-origin: left; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-right { display: flex; align-items: center; gap: 14px; }

/* theme toggle */
.toggle-wrap {
  display: flex; align-items: center; gap: 7px;
  font-size: 11.5px; color: var(--text3);
  cursor: pointer; user-select: none;
  transition: color 0.3s;
}
.toggle-wrap:hover { color: var(--text2); }
.toggle {
  width: 36px; height: 20px;
  border-radius: 100px;
  background: var(--surface2);
  border: 1px solid var(--border);
  position: relative; cursor: pointer;
  transition: background 0.35s, border-color 0.35s;
  flex-shrink: 0;
}
[data-theme="light"] .toggle { background: var(--amber-dim); border-color: var(--amber-border); }
.toggle-thumb {
  position: absolute;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--text3);
  top: 2px; left: 2px;
  transition: transform 0.35s cubic-bezier(0.34,1.56,0.64,1), background 0.35s;
}
[data-theme="light"] .toggle-thumb { transform: translateX(16px); background: var(--amber); }

.nav-cta {
  font-family: 'Outfit', sans-serif;
  font-size: 13px; font-weight: 500;
  color: var(--text);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 7px 18px;
  border-radius: 10px;
  text-decoration: none;
  letter-spacing: 0;
  transition: all 0.3s var(--ease-smooth);
  white-space: nowrap;
  backdrop-filter: blur(8px);
}
.nav-cta:hover { border-color: var(--amber-border); color: var(--amber); background: var(--amber-dim); }

/* mobile toggle */
.mobile-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; position: relative; z-index: 1001; }
.mobile-toggle span {
  display: block; width: 18px; height: 1.5px; background: var(--text2); margin: 4px 0;
  transition: transform 0.3s var(--ease-smooth), opacity 0.2s;
}
.nav-open .mobile-toggle span:nth-child(1) { transform: rotate(45deg) translate(3.5px, 3.5px); }
.nav-open .mobile-toggle span:nth-child(2) { opacity: 0; }
.nav-open .mobile-toggle span:nth-child(3) { transform: rotate(-45deg) translate(3.5px, -3.5px); }

.mobile-menu {
  position: fixed; inset: 0; z-index: 999; background: var(--bg);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  opacity: 0; pointer-events: none; transition: opacity 0.35s var(--ease-smooth);
}
.nav-open .mobile-menu { opacity: 1; pointer-events: auto; }
.mobile-menu a {
  font-family: 'Outfit', sans-serif; font-size: 28px; font-weight: 500;
  letter-spacing: -0.03em; color: var(--text2); text-decoration: none; padding: 12px 0;
  transform: translateY(20px); opacity: 0;
  transition: transform 0.4s var(--ease-out), opacity 0.4s var(--ease-out), color 0.2s;
}
.nav-open .mobile-menu a { transform: translateY(0); opacity: 1; }
.nav-open .mobile-menu a:nth-child(1) { transition-delay: 0.06s; }
.nav-open .mobile-menu a:nth-child(2) { transition-delay: 0.10s; }
.nav-open .mobile-menu a:nth-child(3) { transition-delay: 0.14s; }
.nav-open .mobile-menu a:nth-child(4) { transition-delay: 0.18s; }
.nav-open .mobile-menu a:nth-child(5) { transition-delay: 0.22s; }
.nav-open .mobile-menu a:nth-child(6) { transition-delay: 0.26s; }
.mobile-menu a:hover { color: var(--amber); }

@media (max-width: 900px) {
  nav { padding: 0 20px; }
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
}