/* MS Trading Co. — Header Styles */

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-black);
  border-bottom: 1px solid var(--hairline);
  transition: border-color var(--duration-normal) var(--ease-in-out);
}

header.scrolled {
  border-bottom-color: var(--gold);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Logo section */
.logo-section {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex: 0 0 auto;
}

.logo-mark {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--bg-panel);
  border: 2px solid var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--duration-fast) var(--ease-in-out);
}

.logo-mark:hover {
  transform: scale(1.05);
}

.logo-mark img {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.logo-text {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--ls-wide);
  color: var(--text-primary);
  line-height: 1;
}

.logo-text .gold {
  color: var(--gold);
}

.logo-text .silver {
  color: var(--silver);
}

/* Navigation */
nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

nav a {
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: var(--ls-wide);
  color: var(--text-primary);
  font-weight: 600;
  transition: color var(--duration-fast) var(--ease-in-out);
  position: relative;
  padding-bottom: var(--space-xs);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--gold);
  transition: width var(--duration-fast) var(--ease-in-out);
}

nav a:hover::after,
nav a.active::after {
  width: 100%;
}

nav a:hover,
nav a.active {
  color: var(--gold);
}

/* Hamburger menu (hidden on desktop) */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  background: none;
  border: none;
  padding: var(--space-sm);
  margin: -var(--space-sm);
}

.hamburger span {
  width: 24px;
  height: 2px;
  background-color: var(--gold);
  transition: all var(--duration-normal) var(--ease-in-out);
  display: block;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translateY(10px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translateY(-10px);
}

/* Mobile menu overlay */
.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(11, 11, 10, 0.95);
  display: none;
  flex-direction: column;
  justify-content: flex-start;
  padding-top: 80px;
  z-index: 999;
  animation: slideIn var(--duration-normal) var(--ease-in-out);
}

.nav-overlay.active {
  display: flex;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.nav-overlay a {
  padding: var(--space-lg);
  text-align: center;
  font-size: var(--fs-lg);
  border-bottom: 1px solid var(--hairline);
  transition: all var(--duration-fast) var(--ease-in-out);
}

.nav-overlay a:hover {
  background-color: var(--bg-panel);
}

/* Responsive */
@media (max-width: 768px) {
  .header-container {
    padding: var(--space-md);
  }

  nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .logo-text {
    font-size: var(--fs-sm);
  }

  .logo-mark {
    width: 52px;
    height: 52px;
  }

  .logo-mark img {
    width: 36px;
    height: 36px;
  }
}