/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background-color: transparent;
  transition: background-color var(--transition-base), backdrop-filter var(--transition-base);
  padding: var(--spacing-md) 0;
}

.header.scrolled {
  background-color: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

@media (prefers-color-scheme: dark) {
  .header.scrolled {
    background-color: rgba(10, 10, 10, 0.8);
  }
}

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

.header-logo {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
  transition: opacity var(--transition-fast);
  flex-shrink: 0;
}

.header-actions {
  flex-shrink: 0;
  margin-left: auto;
}

@media (min-width: 768px) {
  .header-container {
    padding: 0 var(--gutter-desktop);
  }
  
  .nav {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    z-index: 1;
  }
  
  .header-logo {
    position: relative;
    z-index: 2;
  }
  
  .header-actions {
    position: relative;
    z-index: 2;
  }
}

.header-logo:hover {
  opacity: 0.7;
}

.header-logo:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* Navigation */
.nav {
  display: none;
  align-items: center;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .nav {
    display: flex;
  }
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-link {
  font-size: var(--font-size-base);
  color: var(--color-text);
  position: relative;
  padding: var(--spacing-xs) 0;
  transition: opacity var(--transition-fast);
  min-height: 44px;
  display: flex;
  align-items: center;
}

.nav-link:hover {
  opacity: 0.7;
}

.nav-link[aria-current="page"] {
  opacity: 1;
}

.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  opacity: 1;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  right: 50%;
  height: 2px;
  background-color: var(--color-accent);
  transition: left var(--transition-base), right var(--transition-base), opacity var(--transition-base);
  opacity: 0;
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  left: 0;
  right: 0;
  opacity: 1;
}

/* Special case: don't show underline for contact link unless it's the active section */
.nav-link[href*="#contact"]:not([aria-current="page"])::after {
  display: none !important;
}

.nav-link[href*="#contact"]:not([aria-current="page"]):hover::after {
  display: block;
  opacity: 1;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.header-social {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.header-social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-text);
  transition: opacity var(--transition-fast);
}

.header-social-link:hover {
  opacity: 0.7;
}

.header-social-link svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

.header-resume-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-text);
  transition: opacity var(--transition-fast);
}

.header-resume-icon:hover {
  opacity: 0.7;
}

.header-resume-icon svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

/* Footer */
.footer {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
  border-top: 1px solid var(--color-border);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter-mobile);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-container {
    padding: 0 var(--gutter-desktop);
  }
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-link {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-text);
}

.footer-social {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.footer-social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer-social-link:hover {
  color: var(--color-text);
}

.footer-social-link svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

/* Main Content */
.main {
  margin-top: 80px; /* Header height */
  min-height: calc(100vh - 80px);
}

/* Grid Systems */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid-3 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Responsive Utilities */
@media (max-width: 767px) {
  .hide-mobile {
    display: none !important;
  }
}

@media (min-width: 768px) {
  .hide-desktop {
    display: none !important;
  }
}