:root {
  --ink-50:  #F7F7F6;
  --ink-100: #EFEFED;
  --ink-200: #E2E2DF;
  --ink-300: #C9C9C4;
  --ink-400: #9A9A93;
  --ink-500: #6E6E66;
  --ink-600: #4A4A43;
  --ink-700: #2E2E2A;
  --ink-800: #1C1C1A;
  --ink-900: #101010;
  --accent:  #059669;

  --grain-dot: rgba(0, 0, 0, 0.025);
  --selection-bg: var(--ink-800);
  --selection-fg: var(--ink-50);
}

html.dark {
  --grain-dot: rgba(255, 255, 255, 0.035);
  --selection-bg: var(--ink-50);
  --selection-fg: var(--ink-900);
  color-scheme: dark;
}

html { scroll-behavior: smooth; }
body { font-feature-settings: "ss01", "cv11"; }

/* fade body on initial paint so theme switch isn't jarring */
body {
  transition: background-color 0.3s ease, color 0.3s ease;
}

.grain::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(var(--grain-dot) 1px, transparent 1px);
  background-size: 3px 3px;
  pointer-events: none;
  z-index: 0;
}

.hover-underline {
  background-image: linear-gradient(currentColor, currentColor);
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 0% 1px;
  transition: background-size 0.3s ease;
}
.hover-underline:hover { background-size: 100% 1px; }

.card-link { transition: background-color 0.3s ease; }
.card-link:hover .card-title { color: var(--accent); }
.card-link:hover .arrow { transform: translate(2px, -2px); }
.card-link:hover .card-image img { transform: scale(1.03); }
.arrow { transition: transform 0.25s ease; }

.card-image {
  overflow: hidden;
}
.card-image img {
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}

::selection { background: var(--selection-bg); color: var(--selection-fg); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--reveal-delay, 0s);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Hero entrance — runs once on load */
.fade-in {
  opacity: 0;
  transform: translateY(8px);
  animation: fadeInUp 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  animation-delay: var(--fade-delay, 0s);
}
@keyframes fadeInUp {
  to { opacity: 1; transform: none; }
}

/* Marker line that draws in */
.draw-line {
  transform: scaleX(0);
  transform-origin: left center;
  animation: drawLine 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  animation-delay: var(--fade-delay, 0s);
}
@keyframes drawLine {
  to { transform: scaleX(1); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal,
  .fade-in,
  .draw-line {
    opacity: 1;
    transform: none;
    animation: none;
    transition: none;
  }
  .arrow,
  .hover-underline,
  .card-image img,
  body {
    transition: none;
  }
}

.mobile-menu[hidden] { display: none; }

/* Theme toggle icon swap */
.theme-toggle .icon-moon { display: inline; }
.theme-toggle .icon-sun  { display: none; }
html.dark .theme-toggle .icon-moon { display: none; }
html.dark .theme-toggle .icon-sun  { display: inline; }

/* Active nav link */
.nav-link {
  position: relative;
  padding-bottom: 2px;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.nav-link.is-active {
  color: var(--ink-900);
}
html.dark .nav-link.is-active { color: var(--ink-50); }
.nav-link.is-active::after { transform: scaleX(1); }

.mobile-nav-link.is-active {
  color: var(--accent);
  border-left: 2px solid var(--accent);
  padding-left: 10px;
  margin-left: -12px;
}