:root {
  --color-white: #fff;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #e5e5e5;
  --color-neutral-600: #525252;
  --color-neutral-900: #171717;
  --color-overlay: rgba(255, 255, 255, 0.95);
  --radius-sm: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-pill: 9999px;
  --space-xs: 0.1875rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --z-skip-link: 60;
  --line-height-readable: 1.7;
  --duration-fast: 0.2s;
  --duration-base: 0.25s;
  --easing-standard: ease;
}

/* Base */
html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Skip link: hidden by default, visible on focus */
.skip-link {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link:focus {
  position: fixed;
  inset-block-start: 1rem;
  inset-inline-start: 1rem;
  z-index: var(--z-skip-link);
  inline-size: auto;
  block-size: auto;
  padding: 0.5rem 1rem;
  margin: 0;
  overflow: visible;
  clip: auto;
  clip-path: none;
  white-space: normal;
  background: var(--color-neutral-900);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  text-decoration: none;
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

/* Components */
.icon-action-btn {
  display: flex;
  inline-size: 2.5rem;
  block-size: 2.5rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-pill);
  background: var(--color-overlay);
  color: var(--color-neutral-600);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  transition: color var(--duration-fast) var(--easing-standard), background var(--duration-fast) var(--easing-standard), border-color var(--duration-fast) var(--easing-standard);
}

.icon-action-btn:hover {
  border-color: #d4d4d4;
  background: var(--color-white);
  color: var(--color-neutral-900);
}

.icon-action-btn:focus-visible {
  outline: 2px solid #a3a3a3;
  outline-offset: 2px;
}

.icon-action-btn--muted {
  box-shadow: none;
}

.overlay-nav-link {
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 1.125rem;
  font-weight: 500;
  color: #404040;
  transition: color var(--duration-fast) var(--easing-standard), background var(--duration-fast) var(--easing-standard);
}

.overlay-nav-link:hover {
  background: var(--color-neutral-100);
  color: var(--color-neutral-900);
}

.section-title {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #a3a3a3;
}

.content-text {
  color: var(--color-neutral-600);
  line-height: var(--line-height-readable);
}

.content-list {
  color: var(--color-neutral-600);
  line-height: var(--line-height-readable);
}

.content-card {
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-xl);
  background: rgba(250, 250, 250, 0.5);
  padding: 1.25rem;
}

.action-chip {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-lg);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #404040;
  transition: background var(--duration-fast) var(--easing-standard);
}

.action-chip:hover {
  background: var(--color-neutral-100);
}

.action-chip:focus-visible {
  outline: 2px solid #a3a3a3;
  outline-offset: 2px;
}

.lang-switch {
  position: relative;
  display: inline-grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-pill);
  background: var(--color-overlay);
  padding: var(--space-xs);
  overflow: hidden;
}

.lang-switch::before {
  content: "";
  position: absolute;
  inset-block: var(--space-xs);
  inset-inline-start: var(--space-xs);
  inline-size: calc(50% - var(--space-xs));
  border-radius: var(--radius-pill);
  background: var(--color-neutral-900);
  transition: transform var(--duration-base) var(--easing-standard);
  pointer-events: none;
}

.lang-switch.is-en::before {
  transform: translateX(100%);
}

.lang-btn {
  position: relative;
  z-index: 1;
  border: 0;
  background: transparent;
  color: var(--color-neutral-600);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  min-width: 3.25rem;
  padding: 0.3rem var(--space-sm);
  cursor: pointer;
  transition: color var(--duration-fast) var(--easing-standard);
}

.lang-btn:hover {
  color: var(--color-neutral-900);
}

.lang-btn.is-active {
  color: var(--color-white);
}

.floating-telegram-cta {
  inline-size: clamp(14rem, 28vw, 17.5rem);
  max-inline-size: calc(100vw - 3rem);
  justify-content: center;
  box-sizing: border-box;
}

.floating-telegram-cta span {
  text-align: center;
}

.resume-content .timeline-item {
  border-inline-start: 2px solid var(--color-neutral-200);
  padding-inline-start: var(--space-md);
}

/* States */
.nav-overlay.nav-overlay--open {
  opacity: 1;
  pointer-events: auto;
}

.nav-overlay__content {
  transform: translateY(-10px);
}

.nav-overlay--open .nav-overlay__content {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 640px) {
  .floating-telegram-cta {
    inline-size: calc(100vw - 3rem);
  }

  .resume-content {
    row-gap: 3rem;
  }

  .resume-content .timeline-item {
    padding-inline-start: 0.875rem;
  }
}