/* --- Navigation & Header --- */

.site-header {
  background-color: var(--color-bg-secondary);
  border-bottom: var(--border-standard);
}

.logo {
  text-decoration: none;
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text-primary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  border: var(--border-width) solid transparent;
  transition: background-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base); 
  box-shadow: 0 0 0 transparent;
  -webkit-tap-highlight-color: transparent;
  will-change: transform, box-shadow;
}

.logo:hover,
.logo:focus-visible {
  background-color: var(--color-accent-primary);
  border: var(--border-standard);
  box-shadow: var(--shadow-base);
  outline: none;
}

.nav-link {
  display: inline-block;
  text-decoration: none;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-weight: 600;
  border: var(--border-width) solid transparent;
  transition: background-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  box-shadow: 0 0 0 transparent;
  -webkit-tap-highlight-color: transparent;
  will-change: transform, box-shadow;
}

.nav-link:hover,
.nav-link:focus-visible {
  background-color: var(--color-accent-primary);
  border: var(--border-standard);
  box-shadow: var(--shadow-base);
}

.logo:active,
.nav-link:active {
  transform: translate(var(--press-distance), var(--press-distance));
}

/* --- Mobile Menu Toggle --- */
.mobile-menu-toggle {
  display: flex;
  background: transparent;
  border: var(--border-width) solid transparent;
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.mobile-menu-toggle:hover,
.mobile-menu-toggle:focus-visible {
  background-color: var(--color-accent-primary);
  border: var(--border-standard);
  box-shadow: var(--shadow-base);
  outline: none;
}

.mobile-menu-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

.mobile-menu-toggle[aria-expanded="true"] .icon-close {
  display: block !important;
}

@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none;
  }
}

/* --- Typography & Headings --- */

.section-title {
  font-size: var(--heading-2);
  font-weight: 800;
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-xl);
  margin-top: 0;
  line-height: var(--line-height-tight);
  border-bottom: var(--border-standard);
  padding-bottom: var(--space-xs);
  display: inline-block;
}


/* --- Theme Toggle --- */

.theme-toggle {
  background: transparent;
  border: var(--border-width) solid transparent;
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-base), box-shadow var(--transition-base), border var(--transition-base);
  color: var(--color-text-primary);
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  background-color: var(--color-accent-primary);
  border: var(--border-standard);
  box-shadow: var(--shadow-base);
  outline: none;
}

.theme-toggle:active {
  transform: translate(var(--press-distance), var(--press-distance));
}

.icon {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

/* Light Mode: Show Moon, Hide Sun */
.icon-sun {
  display: none;
}

/* Dark Mode: Show Sun, Hide Moon */
[data-theme="dark"] .icon-sun {
  display: block;
}

[data-theme="dark"] .icon-moon {
  display: none;
}


/* --- Buttons --- */

.btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-family-primary);
  font-size: var(--text-base);
  font-weight: 700;
  line-height: 1;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base), color var(--transition-base);
  will-change: transform, box-shadow;
}

.btn-primary {
  background-color: var(--color-accent-primary);
  color: var(--color-text-primary);
  border: var(--border-standard);
  box-shadow: var(--shadow-base);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  transform: translate(var(--lift-distance), var(--lift-distance));
  box-shadow: var(--shadow-hover);
  background-color: var(--color-accent-hover);
}

.btn-primary:active {
  transform: translate(var(--press-distance), var(--press-distance));
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-primary);
  border: var(--border-standard);
  box-shadow: var(--shadow-base);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background-color: var(--color-text-primary);
  color: var(--color-bg-primary);
  transform: translate(var(--lift-distance), var(--lift-distance));
  box-shadow: var(--shadow-hover);
}

.btn-ghost:active {
  transform: translate(var(--press-distance-sm), var(--press-distance-sm));
}

/* --- Hero Section --- */

.hero-subtitle {
  font-size: var(--text-xl);
  max-width: 60ch;
  margin-bottom: 0;
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
}

/* --- About & Skills --- */

.about-text p {
  font-size: var(--text-lg);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  margin-top: 0;
  margin-bottom: var(--space-md);
}

.skills-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-top: 0;
  margin-bottom: var(--space-md);
}

.skill-tag {
  background-color: var(--color-bg-surface);
  color: var(--color-text-primary);
  user-select: none;
  display: inline-block;
  font-family: var(--font-family-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  padding: var(--space-sm) var(--space-md);
  border: var(--border-standard);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base);
}

.skill-tag:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-base);
  background-color: var(--color-accent-primary);
  color: var(--color-text-primary);
  cursor: default;
}

/* --- Project Cards --- */

.project-card {
  background-color: var(--color-bg-surface);
  border: var(--border-standard);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-base);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.project-card:hover,
.project-card:focus-within {
  transform: translate(-0.25rem, -0.25rem);
  box-shadow: var(--shadow-hover);
  position: relative;
  z-index: var(--z-standard);
}

.project-image-wrapper {
  aspect-ratio: 16 / 9;
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border: none;
  border-radius: 0;
  border-bottom: var(--border-standard);
}

.project-title {
  margin: 0;
  font-size: var(--text-xl);
  line-height: var(--line-height-tight);
  font-weight: 800;
  color: var(--color-text-primary);
}

.project-description {
  margin: 0;
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
}

.project-tech .skill-tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  box-shadow: 0.125rem 0.125rem 0 var(--color-text-primary);
}

.project-links .btn {
  flex: 1;
  text-align: center;
  font-size: var(--text-sm);
  padding-inline: var(--space-sm);
}

/* --- 5. Contact Section --- */

/* --- 6. Footer --- */

.site-footer {
  border-top: var(--border-standard);
  background-color: var(--color-bg-secondary);
  padding-block: var(--space-xl);
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-family: var(--font-family-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
}

/* --- 7. Utility Classes --- */

.inline-link {
  display: inline;
  text-decoration: none !important;
  font-weight: 800;
  color: var(--color-text-primary);
  box-shadow: inset 0 -0.3em 0 var(--color-accent-primary);
  transition: box-shadow var(--transition-base), color var(--transition-base);
}

.inline-link:hover,
.inline-link:focus-visible {
  outline: none;
  box-shadow: inset 0 -2em 0 var(--color-accent-primary);
  color: var(--color-text-primary);
}