/* TOLVYN Navigation */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.25s ease, border-color 0.25s ease,
              backdrop-filter 0.25s ease;
}

.nav.scrolled {
  background: rgba(10, 12, 16, 0.85);
  border-bottom-color: var(--border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--accent);
}
.nav__logo:hover { color: var(--accent-dim); }

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}
.nav__links a:hover,
.nav__links a.active { color: var(--text); }
.nav__links a.active::after {
  content: '';
  position: absolute;
  bottom: -8px; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav__signin {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.nav__signin:hover { color: var(--text); }

/* hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
  width: 36px; height: 36px;
}
.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* mobile menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
}
.mobile-menu a {
  display: block;
  padding: 12px 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  transition: color var(--transition);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu a:hover { color: var(--text); }
.mobile-menu.open { display: flex; }

@media (max-width: 900px) {
  .nav__links  { display: none; }
  .nav__signin { display: none; }
  .nav__hamburger { display: flex; }
}