/* =========================================================
   NAVBAR — sticky glass nav with chakra brand mark
   ========================================================= */

.navbar {
  position: sticky;
  top: 0;
  z-index: 150;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: rgba(10, 10, 13, 0.55);
  backdrop-filter: var(--blur-glass);
  -webkit-backdrop-filter: var(--blur-glass);
  border-bottom: 1px solid var(--color-surface-border);
  transition: background var(--dur-base), border-color var(--dur-base);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--font-display-en);
  font-weight: 700;
  font-size: var(--fs-lg);
  color: var(--color-white);
  flex-shrink: 0;
}
.brand .chakra-mark {
  width: 34px; height: 34px;
  color: var(--color-chakra);
  animation: chakra-spin 18s linear infinite;
}
.brand-text-hi { font-family: var(--font-display-hi); }
.brand small {
  display: block;
  font-family: var(--font-body-en);
  font-weight: 400;
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--color-text-dim);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  list-style: none;
}
.nav-links a {
  position: relative;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  padding-block: var(--sp-2);
  transition: color var(--dur-fast);
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--gradient-red);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--dur-base) var(--ease-out);
}
.nav-links a:hover, .nav-links a.active { color: var(--color-white); }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }

.nav-actions { display: flex; align-items: center; gap: var(--sp-4); }

.lang-toggle {
  display: flex;
  align-items: center;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-surface-border-strong);
  overflow: hidden;
  font-size: var(--fs-xs);
  font-weight: 600;
}
.lang-toggle button {
  padding: var(--sp-2) var(--sp-4);
  color: var(--color-text-muted);
  transition: all var(--dur-fast);
}
.lang-toggle button.active { background: var(--gradient-red); color: var(--color-white); }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-surface-border-strong);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}
.nav-toggle span {
  width: 18px; height: 2px;
  background: var(--color-white);
  transition: all var(--dur-base) var(--ease-out);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@keyframes chakra-spin { to { transform: rotate(360deg); } }

@media (max-width: 900px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    background: rgba(10, 10, 13, 0.97);
    backdrop-filter: var(--blur-glass);
    padding: var(--sp-6) var(--sp-5);
    gap: var(--sp-5);
    border-bottom: 1px solid var(--color-surface-border);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base);
    max-height: calc(100vh - var(--nav-height));
    overflow-y: auto;
  }
  .nav-links.open { transform: translateY(0); opacity: 1; }
  .nav-toggle { display: inline-flex; }
  .brand small { display: none; }
}