/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-size: var(--text-body-s);
  font-weight: 600;
  border-radius: var(--radius-pill);
  transition:
    background-color var(--duration-fast) var(--ease-standard),
    color var(--duration-fast) var(--ease-standard),
    transform var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
}

.btn--primary {
  background-color: var(--color-blue);
  color: var(--color-surface);
}

.btn--primary:hover {
  background-color: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background-color: var(--color-surface);
  color: var(--color-text-body);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-blue);
  color: var(--color-blue);
}

/* Tags */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-xs);
}

.tag--blue { background: var(--color-blue-tint); color: var(--color-blue); }
.tag--coral { background: var(--color-coral-tint); color: var(--color-coral); }
.tag--teal { background: var(--color-teal-tint); color: var(--color-teal); }
.tag--gray { background: var(--color-surface-alt); color: var(--color-text-muted); }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-body-s);
  font-weight: 500;
  border-radius: var(--radius-pill);
}

.badge--success {
  background: #ecfdf5;
  color: var(--color-success);
}

.badge__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
}

/* Cards */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}

/* Language toggle */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  background: var(--color-surface-alt);
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
}

.lang-btn {
  padding: 0.25rem 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-pill);
  transition:
    background-color var(--duration-fast) var(--ease-standard),
    color var(--duration-fast) var(--ease-standard);
}

.lang-btn.active {
  background: var(--color-surface);
  color: var(--color-blue);
  box-shadow: var(--shadow-xs);
}

/* Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  pointer-events: none;
}

.site-header * {
  pointer-events: auto;
}

.nav-logo {
  position: fixed;
  top: var(--space-lg);
  left: var(--space-lg);
  z-index: 51;
  display: inline-flex;
  align-items: center;
  transition: opacity var(--duration-normal) var(--ease-standard);
}

.nav-logo__img {
  display: block;
  height: 36px;
  width: auto;
  border-radius: 8px;
}

.nav-logo.is-hidden {
  opacity: 0;
  pointer-events: none;
}

#main-nav {
  position: fixed;
  top: var(--space-lg);
  left: 50%;
  transform: translateX(-50%) translateY(-1rem);
  z-index: 50;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  max-width: var(--nav-max);
  padding: 0.75rem 1.5rem;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-out),
    visibility var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out);
}

#main-nav.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-lg);
}

.nav-link {
  font-size: var(--text-body-s);
  font-weight: 500;
  color: var(--color-text-body);
  position: relative;
  transition: color var(--duration-fast) var(--ease-standard);
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--color-blue);
}

.nav-link.is-active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--color-blue);
  border-radius: 1px;
}

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

.nav-resume {
  display: none;
}

/* Hamburger */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2rem;
  height: 2rem;
  padding: 0.25rem;
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: transform var(--duration-normal) var(--ease-standard);
}

.nav-toggle[aria-expanded='true'] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded='true'] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded='true'] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile overlay */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 49;
  background: rgba(26, 23, 20, 0.5);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-standard),
    visibility var(--duration-normal) var(--ease-standard);
}

.nav-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 52;
  width: min(20rem, 85vw);
  height: 100%;
  padding: var(--space-4xl) var(--space-xl) var(--space-xl);
  background: var(--color-surface);
  box-shadow: var(--shadow-xl);
  transform: translateX(100%);
  transition: transform var(--duration-normal) var(--ease-out);
}

.mobile-menu.is-open {
  transform: translateX(0);
}

.mobile-menu__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.mobile-menu__link {
  font-size: var(--text-body-l);
  font-weight: 500;
  color: var(--color-text-body);
}

.mobile-menu__link.is-active {
  color: var(--color-blue);
}

/* Loading screen */
#loading-screen {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--color-canvas);
  transition: opacity var(--duration-slow) var(--ease-out);
}

#loading-screen.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-monogram {
  font-family: var(--font-serif);
  font-size: 4rem;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.loading-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--color-blue);
  animation: loading-fill 0.3s var(--ease-out) forwards;
}

@keyframes loading-fill {
  to { width: 100%; }
}

/* Footer */
.site-footer {
  background: var(--color-text-primary);
  color: rgba(255, 255, 255, 0.7);
  padding-block: var(--space-3xl);
}

.site-footer a:hover {
  color: var(--color-surface);
}

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

  .nav-toggle {
    display: none;
  }

  .nav-resume {
    display: inline-flex;
    padding: 0.4rem 0.95rem;
    font-size: 0.78rem;
    line-height: 1;
    min-height: 0;
    height: auto;
    border-radius: var(--radius-pill);
  }
}