/* ============================================================
   TURTLE GAMES – NAVIGATION & HEADER
   ============================================================ */

/* === HEADER =============================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  transition:
    background 0.3s ease,
    backdrop-filter 0.3s ease,
    border-color 0.3s ease;
}

.site-header.scrolled {
  background: rgba(6, 9, 20, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

body.light-mode .site-header.scrolled {
  background: rgba(240, 244, 250, 0.9);
  border-bottom-color: rgba(0, 0, 0, 0.08);
}

/* === NAV INNER ============================================ */
.nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* === LOGO ================================================= */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--c-text);
  flex-shrink: 0;
  transition: opacity 0.15s ease;
}

.nav-logo:hover {
  opacity: 0.85;
}

.nav-logo .logo-icon {
  font-size: 1.4rem;
  line-height: 1;
}

.nav-logo .logo-text {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

/* === NAV LINKS ============================================ */
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.125rem;
  list-style: none;
}

.nav-link {
  color: var(--c-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  transition: color 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--c-text);
  background: rgba(255, 255, 255, 0.07);
}

body.light-mode .nav-link:hover {
  background: rgba(0, 0, 0, 0.05);
}

/* === NAV ACTIONS ========================================== */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

/* Theme toggle button */
.theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1.5px solid var(--c-border);
  background: transparent;
  color: var(--c-muted);
  font-size: 1rem;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
  flex-shrink: 0;
}

.theme-btn:hover {
  color: var(--c-text);
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.07);
}

body.light-mode .theme-btn:hover {
  background: rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.15);
}

/* === HAMBURGER ============================================ */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 0 8px;
  border-radius: 8px;
  border: 1.5px solid var(--c-border);
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.hamburger:hover {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.07);
}

.hamburger span {
  display: block;
  height: 1.5px;
  border-radius: 2px;
  background: var(--c-muted);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* === MOBILE MENU ========================================== */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  z-index: 999;
  flex-direction: column;
  padding: 0.75rem;
  gap: 0.25rem;
  background: rgba(6, 9, 20, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  animation: menu-slide 0.2s ease;
}

body.light-mode .mobile-menu {
  background: rgba(240, 244, 250, 0.97);
  border-bottom-color: rgba(0, 0, 0, 0.08);
}

.mobile-menu.open {
  display: flex;
}

@keyframes menu-slide {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.mobile-link {
  color: var(--c-muted);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  transition: color 0.15s ease, background 0.15s ease;
  display: block;
}

.mobile-link:hover {
  color: var(--c-text);
  background: rgba(255, 255, 255, 0.07);
}

body.light-mode .mobile-link:hover {
  background: rgba(0, 0, 0, 0.05);
}

/* === RESPONSIVE =========================================== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }
}

@media (max-width: 480px) {
  .nav-inner {
    padding: 0 1rem;
  }
}