/*
  Portfolio / Alex Rudnicki
  Design system, visual design, and front-end code by Alex Rudnicki.
  © 2026 Alex Rudnicki. All rights reserved.
*/

.skip {
  position: fixed;
  top: calc(env(safe-area-inset-top) + 0.5rem);
  left: max(1rem, env(safe-area-inset-left));
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  transform: none;
  opacity: 1;
  background: transparent;
  color: var(--text);
  font-size: var(--type-meta);
  font-weight: var(--weight-strong);
  padding: 0;
  border: 0;
  border-radius: var(--radius-control);
  z-index: var(--z-overlay);
  transition: transform var(--duration-fast) var(--ease-standard);
}
.skip:focus,
.skip:focus-visible {
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  clip-path: none;
  white-space: normal;
  background: var(--panel-bg);
  color: var(--panel-text);
  padding: var(--space-2) var(--space-4);
  transform: translate3d(0, 0, 0);
}

.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: var(--z-nav);
  overflow: hidden;
  isolation: isolate;
  background: var(--nav-glass-bg);
  backdrop-filter: blur(var(--nav-glass-blur)) saturate(var(--nav-glass-saturate));
  -webkit-backdrop-filter: blur(var(--nav-glass-blur)) saturate(var(--nav-glass-saturate));
  border-bottom: 1px solid var(--nav-glass-border);
  box-shadow: var(--nav-glass-shadow);
  height: calc(var(--nav-height) + env(safe-area-inset-top));
  padding-top: env(safe-area-inset-top);
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}
.nav-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--side);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--nav-gap);
}
.nav-logo {
  font-size: var(--type-body-sm);
  font-weight: var(--weight-label);
  letter-spacing: 0;
  color: var(--nav-logo-text);
  transition: color var(--duration-fast) var(--ease-standard);
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-logo:hover { color: var(--nav-logo-text-hover); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--nav-link-gap);
  flex-shrink: 1;
  margin-left: auto;
}
.nav-links a {
  display: flex;
  align-items: center;
  min-height: var(--menu-control-size);
  font-size: var(--type-nav);
  font-weight: var(--weight-body);
  color: var(--nav-link-text);
  padding: var(--control-pad);
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  transition:
    color var(--duration-fast),
    background var(--duration-fast),
    border-color var(--duration-fast),
    box-shadow var(--duration-fast);
  white-space: nowrap;
}
.nav-links a:hover {
  color: var(--nav-link-text-hover);
  background: var(--nav-link-bg-hover);
}
.nav-links a.nav-active { color: var(--nav-link-text-active); }
.nav-theme-control {
  flex-shrink: 0;
}
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--control-size);
  height: var(--control-size);
  padding: 0;
  color: var(--nav-control-text);
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  border-radius: var(--radius-control);
  box-shadow: none;
  cursor: pointer;
  font: inherit;
  transition:
    color var(--duration-fast) var(--ease-standard),
    background var(--duration-fast) var(--ease-standard),
    border-color var(--duration-fast) var(--ease-standard),
    transform var(--duration-fast) var(--ease-decelerate);
}
.theme-toggle:hover,
.theme-toggle:focus-visible {
  color: var(--nav-control-text);
  background: var(--btn-bg-hover);
  border-color: var(--btn-border-hover);
  border-radius: var(--radius-control);
  transform: translateY(var(--lift-control));
}
.theme-toggle svg {
  width: var(--icon-size);
  height: var(--icon-size);
  display: block;
}
.theme-toggle .theme-icon-sun {
  display: none;
  width: var(--icon-size-sun);
  height: var(--icon-size-sun);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-1);
  width: var(--menu-control-size);
  height: var(--menu-control-size);
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  border-radius: var(--radius-control);
  transition: background var(--duration-fast) var(--ease-standard);
}
.nav-hamburger:hover { background: var(--nav-link-bg-hover); }
.nav-hamburger span {
  display: block;
  width: var(--hamburger-bar-w);
  height: var(--hamburger-bar-h);
  background: var(--nav-logo-text);
  border-radius: var(--radius-control);
  transition: transform var(--duration-medium) var(--ease-standard), opacity var(--duration-fast) var(--ease-standard);
  transform-origin: center;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(var(--hamburger-bar-shift)) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(calc(var(--hamburger-bar-shift) * -1)) rotate(-45deg); }

.nav-drawer {
  display: none;
  position: fixed;
  top: calc(var(--nav-height) + env(safe-area-inset-top));
  left: 0;
  right: 0;
  z-index: var(--z-drawer);
  overflow-y: auto;
  flex-direction: column;
  gap: 0;
  padding: var(--space-sm) var(--side) var(--stack-compact);
  background: var(--nav-drawer-glass-bg);
  backdrop-filter: blur(var(--nav-drawer-glass-blur)) saturate(var(--nav-drawer-glass-saturate));
  -webkit-backdrop-filter: blur(var(--nav-drawer-glass-blur)) saturate(var(--nav-drawer-glass-saturate));
  border-bottom: 1px solid var(--nav-drawer-glass-border);
  box-shadow: var(--nav-drawer-glass-shadow);
  transform: translateY(var(--nav-drawer-shift));
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    transform var(--duration-medium) var(--ease-standard),
    opacity var(--duration-fast) var(--ease-standard),
    visibility var(--duration-fast) var(--ease-standard);
}
.nav-drawer.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.nav-drawer a {
  display: block;
  min-height: var(--control-min);
  padding: var(--drawer-link-pad);
  border-radius: var(--radius-control);
  color: var(--nav-link-text);
  font-size: var(--type-body-sm);
  font-weight: var(--weight-body);
  transition: color var(--duration-fast) var(--ease-standard), background var(--duration-fast) var(--ease-standard);
}
.nav-drawer a:hover {
  color: var(--nav-link-text-hover);
  background: var(--nav-link-bg-hover);
}
.sec-head { margin-bottom: var(--sec-head-gap); }
.sec-bar {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: clamp(var(--space-2), 1.3vw, var(--space-3));
}
.sec-bar--rule-only {
  gap: 0;
}
.sec-label {
  font-size: var(--type-meta);
  font-weight: var(--weight-label);
  letter-spacing: 0;
  text-transform: none;
  color: var(--accent-muted);
  flex-shrink: 0;
}
.sec-counter {
  color: var(--subtle);
  font-size: var(--type-meta);
  font-weight: var(--weight-label);
  letter-spacing: 0;
  line-height: var(--leading-label);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}
.sec-rule {
  flex: 1;
  height: 1px;
  background: var(--border);
  opacity: var(--case-card-label-rule-opacity);
}

footer {
  background: var(--cream);
  border-top: 1px solid var(--border);
  padding: clamp(var(--space-5), 2.5vw, var(--space-7)) var(--side);
  text-align: center;
}
.footer-inner {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
}
.title-hi {
  color: var(--accent);
}

.footer-name {
  color: var(--subtle);
  font-size: var(--type-meta);
  font-weight: var(--weight-body);
  letter-spacing: 0;
  text-transform: none;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.88' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: var(--grain-size) var(--grain-size);
}

[data-theme="night"] .theme-toggle .theme-icon-moon { display: none; }
[data-theme="night"] .theme-toggle .theme-icon-sun { display: block; }
[data-theme="night"] footer {
  border-top-color: var(--rule-faint);
}

@media (max-width: 960px) {
  .nav-links { gap: var(--space-1); }
  .nav-links a { padding: var(--control-pad-compact); font-size: var(--type-meta); }
}

@media (max-width: 820px) {
  .nav-hamburger { display: flex; margin-left: var(--space-1); }
  .nav-links { display: none; }
  .nav-theme-control { margin-left: auto; }
  .nav-drawer {
    display: flex;
    max-height: calc(100svh - var(--nav-height) - env(safe-area-inset-top));
  }
  .sec-head { padding-bottom: 0; }
  .sec-bar {
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
  }
  .sec-rule {
    flex: 1;
    min-width: var(--space-5);
  }
}

@media (max-width: 480px) {
  .nav-inner { gap: var(--space-2); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}