@layer base, layout, demo, controls;

@layer base {
  * {
    box-sizing: border-box;
  }

  :root {
    --clr-bg: #ffffff;
    --ink: #111827;
    --ink-muted: #475569;
    --panel-border: rgba(15, 23, 42, 0.12);
  }

  body {
    margin: 0;
    min-height: 100vh;
    min-height: 100dvh;
    min-height: 100svh;
    padding:
      max(0.45rem, env(safe-area-inset-top))
      max(0.6rem, env(safe-area-inset-right))
      max(1rem, calc(env(safe-area-inset-bottom) + 1rem))
      max(0.6rem, env(safe-area-inset-left));
    overflow: hidden;
    display: grid;
    grid-template-rows: minmax(0, 1fr) auto;
    gap: clamp(0.35rem, 1.6vw, 0.8rem);
    align-items: stretch;
    color: var(--ink);
    line-height: 1.45;
    font-family: "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
    background: #ffffff;
    -webkit-text-size-adjust: 100%;
    overscroll-behavior: none;
    touch-action: manipulation;
  }

  body.is-scrubbing {
    touch-action: none;
    cursor: grabbing;
  }
}

@layer layout {
  .experience {
    min-height: 0;
    display: grid;
    place-items: center;
    position: relative;
  }

  .optical-frame {
    width: min(100%, 44rem);
    height: 100%;
    display: grid;
    place-items: center;
    padding: 0;
  }
}

@layer demo {
  @property --x {
    syntax: "<percentage>";
    inherits: true;
    initial-value: 0%;
  }

  .optical {
    position: relative;
    width: min(94vw, calc(100dvh - clamp(4.7rem, 13vw, 5.9rem)), 30rem);
    aspect-ratio: 1;
    border-radius: 0;
    background-size: var(--art-size, cover);
    background-position: var(--art-position, center 48%);
    background-repeat: no-repeat;
    background-color: var(--clr-bg);
    contain: layout paint;
    backface-visibility: hidden;
    overflow: hidden;
    background-image: url("https://raw.githubusercontent.com/cbolson/assets/refs/heads/main/codepen/optical/man-running.png");
    --stripe-px: clamp(5.5px, 0.38vw + 4px, 7.4px);
    --stripe-solid: 76%;
    --art-size: cover;
    --art-position: center 48%;
    --art-size-mobile: contain;
    --art-position-mobile: center 52%;
    --x: 0%;
    transform: translateZ(0);
  }

  body[data-scene="panther"] .optical {
    --stripe-px: clamp(6.2px, 0.44vw + 4.2px, 8.4px);
    --stripe-solid: 74%;
    --art-position: center 52%;
    --art-position-mobile: center 50%;
    aspect-ratio: 6 / 4;
    background-image: url("https://raw.githubusercontent.com/cbolson/assets/refs/heads/main/codepen/optical/cat-running.png");
  }

  body[data-scene="bmx"] .optical {
    --stripe-px: clamp(6px, 0.42vw + 4.1px, 8.2px);
    --stripe-solid: 74%;
    --art-position: center 50%;
    --art-position-mobile: center 49%;
    aspect-ratio: 6 / 4;
    background-image: url("https://raw.githubusercontent.com/cbolson/assets/refs/heads/main/codepen/optical/bmx.png");
  }

  .optical::before {
    content: none;
  }

  .optical::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: linear-gradient(90deg, var(--clr-bg) 0 var(--stripe-solid), transparent 0 100%);
    background-size: var(--stripe-px) 100%;
    background-repeat: repeat;
    background-position-x: var(--x);
    transition: background-position-x 78ms linear;
    will-change: background-position;
  }
}

@layer controls {
  .control-dock {
    width: min(100%, 32rem);
    margin: 0 auto;
    padding: 0;
    display: grid;
    gap: 0.45rem;
    justify-items: center;
  }

  .scene-toggle {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    border: 0;
    margin: 0;
    padding: 0;
    width: min(100%, 22rem);
  }

  .scene-option {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 2.1rem;
    min-width: 5.4rem;
    padding: 0.42rem 0.75rem;
    border-radius: 999px;
    border: 1px solid rgba(15, 23, 42, 0.12);
    background: rgba(255, 255, 255, 0.98);
    color: #64748b;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
    transition:
      color 150ms ease,
      background-color 150ms ease,
      border-color 150ms ease,
      transform 150ms ease,
      box-shadow 150ms ease;
  }

  .scene-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
  }

  .scene-option span {
    letter-spacing: 0.03em;
    font-size: 0.78rem;
    font-weight: 600;
  }

  .scene-option.is-active {
    background: #111827;
    border-color: #111827;
    color: #f8fafc;
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(15, 23, 42, 0.14);
  }

  .scene-option:focus-within,
  #scrub:focus-visible {
    outline: 2px solid rgba(15, 23, 42, 0.28);
    outline-offset: 2px;
  }

  .controls {
    display: grid;
    width: min(100%, 20rem);
  }

  #scrub {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 1.6rem;
    margin: 0;
    padding: 0;
    background: transparent;
    accent-color: #111827;
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
  }

  #scrub::-webkit-slider-runnable-track {
    height: 0.28rem;
    border: 0;
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(15, 23, 42, 0.18), rgba(15, 23, 42, 0.08));
  }

  #scrub::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 0.95rem;
    height: 0.95rem;
    margin-top: -0.335rem;
    border: 0;
    border-radius: 50%;
    background: #111827;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.92), 0 6px 14px rgba(15, 23, 42, 0.16);
  }

  #scrub::-moz-range-track {
    height: 0.28rem;
    border: 0;
    border-radius: 999px;
    background: linear-gradient(90deg, rgba(15, 23, 42, 0.18), rgba(15, 23, 42, 0.08));
  }

  #scrub::-moz-range-thumb {
    width: 0.95rem;
    height: 0.95rem;
    border: 0;
    border-radius: 50%;
    background: #111827;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.92), 0 6px 14px rgba(15, 23, 42, 0.16);
  }

  #scrub.is-dragging {
    cursor: grabbing;
  }
}

@media (max-width: 1100px), (hover: none) and (pointer: coarse) {
  body {
    padding-bottom: max(0.95rem, calc(env(safe-area-inset-bottom) + 0.95rem));
  }

  .optical-frame {
    width: 100%;
  }

  .optical {
    width: min(96vw, calc(100dvh - 5.9rem), 25rem);
    background-size: var(--art-size-mobile, contain);
    background-position: var(--art-position-mobile, center 52%);
    --stripe-solid: 71%;
  }

  body[data-scene="panther"] .optical,
  body[data-scene="bmx"] .optical {
    --stripe-solid: 68%;
  }

  .optical::after {
    transition: none;
    background-size: clamp(5.2px, 1.3vw + 1.4px, 7.2px) 100%;
  }

  .scene-option {
    flex: 0 1 auto;
  }
}

@media (max-width: 640px) {
  body {
    padding:
      max(0.35rem, env(safe-area-inset-top))
      max(0.85rem, env(safe-area-inset-right))
      max(0.95rem, calc(env(safe-area-inset-bottom) + 0.95rem))
      max(0.85rem, env(safe-area-inset-left));
    gap: 0.55rem;
  }

  .optical-frame {
    width: 100%;
  }

  .optical {
    width: min(96vw, calc(100dvh - 6.1rem), 22rem);
    background-size: var(--art-size-mobile, contain);
    background-position: var(--art-position-mobile, center 52%);
    --stripe-solid: 69%;
  }

  body[data-scene="panther"] .optical,
  body[data-scene="bmx"] .optical {
    --stripe-solid: 66%;
  }

  .optical::after {
    background-size: clamp(5.6px, 1.55vw, 7.8px) 100%;
  }

  .control-dock {
    gap: 0.35rem;
  }

  .scene-toggle {
    width: min(100%, 19.5rem);
    gap: 0.35rem;
  }

  .scene-option {
    min-height: 2rem;
    min-width: 5rem;
    padding: 0.42rem 0.55rem;
  }

  .scene-option span {
    font-size: 0.72rem;
  }

  #scrub {
    height: 1.85rem;
  }

  #scrub::-webkit-slider-thumb {
    width: 1.1rem;
    height: 1.1rem;
    margin-top: -0.41rem;
  }

  #scrub::-moz-range-thumb {
    width: 1.1rem;
    height: 1.1rem;
  }
}

@media (max-height: 700px) and (orientation: landscape) {
  body {
    padding-bottom: max(0.7rem, calc(env(safe-area-inset-bottom) + 0.7rem));
    gap: 0.35rem;
  }

  .optical {
    width: min(96vw, calc(100dvh - 4.25rem), 26rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .scene-option {
    transition: none;
  }

  .optical::after {
    transition: none;
  }
}