/**
 * SRL — dither design language
 */
:root {
  --ink: #000000;
  --paper: #ffffff;
  --dither-shift-duration: 14s;
  --dither-shift-duration-light: 18s;
  --focus-ring: 2px solid var(--ink);
}

.fill-dither-light {
  fill: url(#pat-dither-light);
}

.fill-dither-dark {
  fill: url(#pat-dither-dark);
}

@keyframes ditherGrain {
  0% {
    transform: translate(0, 0);
  }
  25% {
    transform: translate(2px, 1px);
  }
  50% {
    transform: translate(4px, 0);
  }
  75% {
    transform: translate(2px, -1px);
  }
  100% {
    transform: translate(0, 0);
  }
}

.dither-field--dark {
  position: absolute;
  inset: 0;
  background-color: var(--ink);
  overflow: hidden;
}

.dither-field--dark::before,
.dither-field--dark::after {
  content: "";
  position: absolute;
  inset: -40%;
  width: 180%;
  height: 180%;
  pointer-events: none;
  will-change: transform;
}

.dither-field--dark::before {
  background-image: radial-gradient(circle, rgba(255, 255, 255, 0.22) 0.55px, transparent 0.6px);
  background-size: 3px 3px;
  opacity: 0.85;
  animation: ditherGrain var(--dither-shift-duration) linear infinite;
}

.dither-field--dark::after {
  background-image:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.06) 0 1px, transparent 1px 2px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px 3px);
  background-size: 2px 2px, 3px 3px;
  mix-blend-mode: screen;
  opacity: 0.6;
  animation: ditherGrain calc(var(--dither-shift-duration) * 0.85) linear infinite reverse;
}

@media (prefers-reduced-motion: reduce) {
  .dither-field--dark::before,
  .dither-field--dark::after {
    animation: none;
    transform: none;
  }
}

@keyframes ditherDriftLight {
  0% {
    background-position: 0 0, 3px 2px;
  }
  100% {
    background-position: 6px 4px, 9px 6px;
  }
}

.dither-field--light {
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 1px, rgba(0, 0, 0, 0.055) 1px, rgba(0, 0, 0, 0.055) 2px),
    repeating-linear-gradient(90deg, transparent, transparent 1px, rgba(0, 0, 0, 0.035) 1px, rgba(0, 0, 0, 0.035) 2px);
  background-size: 2px 2px, 4px 4px;
  animation: ditherDriftLight var(--dither-shift-duration-light) linear infinite;
}

@media (prefers-reduced-motion: reduce) {
  .dither-field--light {
    animation: none;
  }

  .hero-canvas {
    display: none;
  }
}

/* Halftone panels (hero + cards) */
.dither-panel {
  border: 3px solid var(--ink);
  background-color: var(--paper);
  background-image: repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 3px,
      rgba(0, 0, 0, 0.09) 3px,
      rgba(0, 0, 0, 0.09) 4px
    ),
    repeating-linear-gradient(45deg, #fff, #fff 2px, rgba(0, 0, 0, 0.04) 2px, rgba(0, 0, 0, 0.04) 4px);
  background-size: 8px 8px, 5px 5px;
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.15);
}

.dither-panel--inverse {
  background-color: #0a0a0a;
  color: #fff;
  border-color: #fff;
  background-image: repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 3px,
      rgba(255, 255, 255, 0.12) 3px,
      rgba(255, 255, 255, 0.12) 4px
    ),
    repeating-linear-gradient(45deg, #111, #111 2px, rgba(255, 255, 255, 0.06) 2px, rgba(255, 255, 255, 0.06) 4px);
  box-shadow: 6px 6px 0 rgba(255, 255, 255, 0.12);
}

.btn {
  --btn-bg: var(--paper);
  --btn-fg: var(--ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 0.85rem 1.35rem;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid var(--ink);
  color: var(--btn-fg);
  background-color: var(--btn-bg);
  background-image: repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 2px,
      rgba(0, 0, 0, 0.12) 2px,
      rgba(0, 0, 0, 0.12) 3px
    ),
    repeating-linear-gradient(45deg, transparent, transparent 2px, rgba(0, 0, 0, 0.06) 2px, rgba(0, 0, 0, 0.06) 3px);
  background-size: 6px 6px, 9px 9px;
  background-blend-mode: multiply;
  box-shadow: 3px 3px 0 var(--ink);
  transition: transform 0.08s ease, box-shadow 0.08s ease, background-position 0.2s ease;
  image-rendering: pixelated;
}

.btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--ink);
  background-position: 3px 0, 0 2px;
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--ink);
}

.btn:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
}

.btn--inverse {
  --btn-bg: var(--ink);
  --btn-fg: var(--paper);
  background-image: repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 2px,
      rgba(255, 255, 255, 0.18) 2px,
      rgba(255, 255, 255, 0.18) 3px
    ),
    repeating-linear-gradient(45deg, transparent, transparent 2px, rgba(255, 255, 255, 0.08) 2px, rgba(255, 255, 255, 0.08) 3px);
  background-blend-mode: screen;
  box-shadow: 3px 3px 0 rgba(255, 255, 255, 0.35);
}

.btn--inverse:hover {
  box-shadow: 4px 4px 0 rgba(255, 255, 255, 0.45);
}

.btn__icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

.btn--sm {
  padding: 0.55rem 0.95rem;
  font-size: 0.75rem;
  box-shadow: 2px 2px 0 var(--ink);
}

.btn--sm:hover {
  box-shadow: 3px 3px 0 var(--ink);
}

.btn--sm:active {
  box-shadow: 1px 1px 0 var(--ink);
}

.nav-dither {
  background-color: var(--paper);
  background-image: repeating-linear-gradient(0deg, #fff, #fff 1px, #000 1px, #000 2px),
    repeating-linear-gradient(90deg, transparent, transparent 3px, rgba(0, 0, 0, 0.15) 3px, rgba(0, 0, 0, 0.15) 4px);
  background-size: 100% 2px, 4px 100%;
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
}

.terminal {
  border: 3px solid var(--ink);
  background: var(--paper);
  background-image: repeating-linear-gradient(180deg, #fff, #fff 1px, rgba(0, 0, 0, 0.04) 1px, rgba(0, 0, 0, 0.04) 2px);
  box-shadow: 8px 8px 0 var(--ink);
}

.terminal__titlebar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.65rem;
  border-bottom: 3px solid var(--ink);
  background: repeating-linear-gradient(90deg, #000, #000 1px, #fff 1px, #fff 2px);
  background-size: 4px 100%;
}

.terminal__dot {
  width: 10px;
  height: 10px;
  border: 2px solid var(--ink);
  background: var(--paper);
}

.terminal__body {
  padding: 1rem 1.1rem;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: clamp(0.9rem, 2.5vw, 1.1rem);
  color: var(--ink);
}

.terminal__prompt {
  color: var(--ink);
  user-select: all;
}

.cursor-blink::after {
  content: "_";
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cursor-blink::after {
    animation: none;
    opacity: 1;
  }
}