:root {
  color-scheme: light;
  --paper: #f3f4f0;
  --ink: #202724;
  --muted: #707975;
  --line: #cfd4d0;
  --mint: #5d9e8a;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color: var(--ink);
  font-family: Pretendard, SUIT, "Noto Sans KR", Arial, sans-serif;
}

body {
  min-width: 20rem;
  margin: 0;
}

button,
input {
  font: inherit;
}

.particle-lab {
  width: min(100%, 112rem);
  min-height: 100svh;
  margin: 0 auto;
  padding: 0 clamp(1rem, 3vw, 3.5rem) clamp(3rem, 7vw, 7rem);
}

.particle-lab-header {
  display: flex;
  height: 4.6rem;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  font-size: 0.62rem;
  font-weight: 760;
  letter-spacing: 0.14em;
}

.particle-lab-header a {
  color: inherit;
  text-decoration: none;
}

.particle-lab-header span {
  color: var(--muted);
}

.particle-lab-intro {
  display: grid;
  grid-template-columns: minmax(9rem, 0.45fr) minmax(22rem, 1.2fr) minmax(18rem, 0.7fr);
  gap: 2rem;
  align-items: end;
  padding: clamp(3rem, 7vw, 7rem) 0 clamp(2.5rem, 5vw, 5rem);
}

.particle-lab-intro > * {
  margin: 0;
}

.particle-lab-intro > p:first-child {
  align-self: start;
  color: var(--mint);
  font-size: 0.62rem;
  font-weight: 780;
  letter-spacing: 0.16em;
}

.particle-lab-intro h1 {
  font-size: clamp(2.7rem, 5.6vw, 6.8rem);
  font-weight: 620;
  letter-spacing: -0.075em;
  line-height: 0.98;
}

.particle-lab-intro > p:last-child {
  color: #56605b;
  font-size: 0.88rem;
  letter-spacing: -0.02em;
  line-height: 1.8;
}

.particle-lab-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(0.8rem, 1.6vw, 1.5rem);
}

.particle-lab-comparison figure {
  position: relative;
  aspect-ratio: 3 / 2;
  min-width: 0;
  margin: 0;
  overflow: hidden;
  background: #e9ebe7;
}

.particle-lab-source img,
.particle-lab-output canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.particle-lab-source img {
  object-fit: cover;
}

.particle-lab-output canvas {
  touch-action: pan-y;
}

.particle-lab-output::before {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 52% 45%, rgb(255 255 255 / 74%), transparent 43%),
    #edf0eb;
  content: "";
}

.particle-lab-output canvas {
  position: relative;
  z-index: 1;
}

.particle-lab-comparison figcaption {
  position: absolute;
  z-index: 3;
  right: 0.8rem;
  bottom: 0.8rem;
  left: 0.8rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.55rem;
  padding: 0.66rem 0.75rem;
  background: rgb(244 246 242 / 86%);
  color: #39413d;
  font-size: 0.58rem;
  backdrop-filter: blur(12px);
}

.particle-lab-comparison figcaption span {
  color: var(--mint);
  font-weight: 800;
}

.particle-lab-comparison figcaption b {
  font-weight: 720;
}

.particle-lab-comparison figcaption em {
  color: var(--muted);
  font-style: normal;
  letter-spacing: 0.08em;
}

.particle-lab-loading {
  position: absolute;
  z-index: 2;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
}

.particle-lab-output[data-ready="true"] .particle-lab-loading {
  display: none;
}

.particle-lab-controls {
  display: grid;
  grid-template-columns: auto minmax(15rem, 1fr) auto;
  gap: clamp(1rem, 2.5vw, 2.6rem);
  align-items: center;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--line);
}

.particle-lab-modes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.particle-lab-modes button,
.particle-lab-replay {
  min-height: 2.45rem;
  padding: 0 0.9rem;
  border: 1px solid #bbc3be;
  border-radius: 99rem;
  background: transparent;
  color: #535d58;
  cursor: pointer;
  font-size: 0.62rem;
  font-weight: 680;
}

.particle-lab-modes button[data-active="true"] {
  border-color: var(--mint);
  background: var(--mint);
  color: white;
}

.particle-lab-controls label {
  display: grid;
  grid-template-columns: auto 1fr 2rem;
  gap: 0.75rem;
  align-items: center;
  color: var(--muted);
  font-size: 0.58rem;
  font-weight: 760;
  letter-spacing: 0.09em;
}

.particle-lab-controls input {
  width: 100%;
  accent-color: var(--mint);
}

.particle-lab-controls label b {
  color: var(--ink);
  text-align: right;
}

.particle-lab-notes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(1rem, 3vw, 3.5rem);
  padding-top: clamp(2rem, 4vw, 4rem);
}

.particle-lab-notes p {
  margin: 0;
  color: #626c67;
  font-size: 0.78rem;
  line-height: 1.75;
}

.particle-lab-notes b {
  color: var(--ink);
}

@media (max-width: 64rem) {
  .particle-lab-intro {
    grid-template-columns: 1fr 2fr;
  }

  .particle-lab-intro > p:last-child {
    grid-column: 2;
  }

  .particle-lab-controls {
    grid-template-columns: 1fr auto;
  }

  .particle-lab-controls label {
    grid-column: 1 / -1;
    grid-row: 2;
  }
}

@media (max-width: 43rem) {
  .particle-lab-header {
    height: 3.8rem;
  }

  .particle-lab-intro {
    display: block;
    padding: 3rem 0 2.2rem;
  }

  .particle-lab-intro h1 {
    margin: 1rem 0 1.3rem;
    font-size: clamp(2.5rem, 12vw, 4rem);
  }

  .particle-lab-comparison {
    grid-template-columns: 1fr;
  }

  .particle-lab-controls {
    display: flex;
    flex-direction: column;
    align-items: stretch;
  }

  .particle-lab-modes {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .particle-lab-modes button {
    padding: 0 0.45rem;
  }

  .particle-lab-notes {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}