:root {
  --space-1: clamp(0.4rem, 0.25rem + 0.9vw, 1rem);
  --space-2: clamp(0.85rem, 0.5rem + 1.8vw, 2.2rem);
  --space-3: clamp(1.4rem, 0.6rem + 3.4vw, 4.25rem);
  --space-4: clamp(3rem, 1.5rem + 8vw, 8rem);
  --radius: clamp(0.5rem, 0.2rem + 0.8vw, 1.1rem);
  --gap: clamp(1.2rem, 1rem + 2.8vw, 3rem);
  --border: color-mix(in srgb, #101010 25%, #ffffff 75%);
  --panel: color-mix(in srgb, #1c1c1c 90%, #0f0f0f 10%);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  min-width: 0;
}

html {
  font-size: clamp(0.9375rem, 0.85rem + 0.35vw, 1.125rem);
}

body {
  margin: 0;
  width: 100%;
  overflow-x: hidden;
  font-family: "Montserrat", sans-serif;
  background: #0f0f0f;
  color: #f7f7f7;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

:focus {
  outline: none;
}

:focus-visible {
  outline: 0.125rem solid currentColor;
  outline-offset: 0.125rem;
  border-radius: 0.125rem;
}

.skip-link {
  position: fixed;
  left: 0.75rem;
  top: -3rem;
  z-index: 1000;
  padding: 0.6rem 1rem;
  background: #111;
  color: #fff;
  border-radius: 0.25rem;
  text-decoration: none;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 0.75rem;
}

.tester-header {
  padding: clamp(0.45rem, 0.38rem + 0.3vw, 0.62rem) clamp(1rem, 1rem + 3vw, 4rem);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1);
}

.tester-home-link {
  color: #ffffff;
  text-decoration: none;
}

.nav-logo {
  font-size: clamp(1rem, 0.9rem + 0.8vw, 1.4rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
  text-decoration: none;
  margin-top: 20px;
  background-image: linear-gradient(
    90deg,
    #3d3d42 0%,
    #7a7a82 18%,
    #ededf2 24%,
    #7a7a82 30%,
    #3d3d42 50%,
    #3d3d42 50%,
    #7a7a82 70%,
    #ededf2 76%,
    #7a7a82 82%,
    #3d3d42 100%
  );
  background-size: 200% 100%;
  background-position: 0% 50%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  animation: navLogoSweep 4.5s linear infinite;
  transition: opacity 0.3s ease;
}

.nav-logo:hover {
  opacity: 0.65;
}

@keyframes navLogoSweep {
  0%   { background-position: 200% 50%; }
  100% { background-position: 0% 50%; }
}

@media (prefers-reduced-motion: reduce) {
  .nav-logo {
    animation: none;
    background-position: 75% 50%;
  }
}

.tester-home-link {
  font-size: clamp(0.82rem, 0.75rem + 0.45vw, 1rem);
}

main {
  padding: 0 clamp(1rem, 1rem + 3vw, 4rem) clamp(0.45rem, 0.4rem + 0.25vw, 0.65rem);
  flex: 1;
}

h1 {
  margin: 0 0 clamp(0.28rem, 0.24rem + 0.14vw, 0.42rem);
  font-size: clamp(1.18rem, 1rem + 1vw, 1.55rem);
  font-weight: 700;
}

.intro {
  max-width: none;
  white-space: nowrap;
  text-align: center;
  margin: 0 0 clamp(0.35rem, 0.3rem + 0.2vw, 0.5rem);
  padding-left: 30px;
  font-size: clamp(0.76rem, 0.72rem + 0.2vw, 0.84rem);
  line-height: 1.35;
  color: color-mix(in srgb, #ffffff 84%, #cdc7bc 16%);
}

.app-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  position: relative;
  padding-top: 30px;
}

.control-panel {
  background: var(--panel);
  color: #f2f2f2;
  border: 0.0625rem solid var(--border);
  border-radius: var(--radius);
  padding: clamp(0.8rem, 0.65rem + 0.7vw, 1.2rem);
  display: grid;
  gap: clamp(0.28rem, 0.22rem + 0.2vw, 0.45rem);
  max-block-size: none;
  overflow: visible;
  zoom: 0.9;
}

.control-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1);
}

.panel-collapse-btn {
  inline-size: clamp(1.9rem, 1.6rem + 1vw, 2.4rem);
  block-size: clamp(1.9rem, 1.6rem + 1vw, 2.4rem);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.35rem);
  padding: 0;
}

.floating-controls {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: clamp(0.2rem, 0.15rem + 0.2vw, 0.35rem);
}

.floating-btn {
  inline-size: clamp(1.9rem, 1.6rem + 1vw, 2.4rem);
  block-size: clamp(1.9rem, 1.6rem + 1vw, 2.4rem);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(0.62rem, 0.55rem + 0.3vw, 0.78rem);
  padding: 0;
  text-transform: lowercase;
  background: transparent;
  color: #000;
  border: 1px solid #000;
}

.panel-reveal-btn {
  display: none;
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 20;
  inline-size: clamp(1.9rem, 1.6rem + 1vw, 2.4rem);
  block-size: clamp(1.9rem, 1.6rem + 1vw, 2.4rem);
  align-items: center;
  justify-content: center;
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.35rem);
  padding: 0;
  background: transparent;
  color: #000;
  border: 1px solid #000;
}

.panel-reveal-btn[hidden] {
  display: none !important;
}

.app-layout.panel-hidden .panel-reveal-btn:not([hidden]) {
  display: inline-flex;
}

.app-layout.panel-hidden .panel-col {
  display: none;
}

.app-layout.panel-hidden {
  grid-template-columns: 1fr;
}

.control-panel h2 {
  margin: clamp(0.5rem, 0.4rem + 0.3vw, 0.7rem) 0 0;
  font-size: clamp(0.75rem, 0.72rem + 0.16vw, 0.84rem);
  letter-spacing: 0.03em;
}

.control-panel label,
.control-panel output,
.oil-match {
  font-family: "Lato", sans-serif;
}

.control-panel label {
  font-size: clamp(0.66rem, 0.64rem + 0.1vw, 0.72rem);
}

.color-row {
  display: grid;
  grid-template-columns: minmax(4rem, 5.5rem) minmax(0, 1fr);
  align-items: center;
  gap: var(--space-1);
}

input[type="color"] {
  inline-size: 100%;
  block-size: clamp(1.55rem, 1.45rem + 0.5vw, 1.85rem);
  border: 0.0625rem solid color-mix(in srgb, #ffffff 25%, #111111 75%);
  border-radius: 0.38rem;
  background: #181818;
}

input[type="text"] {
  inline-size: 100%;
  border: 0.0625rem solid color-mix(in srgb, #ffffff 25%, #111111 75%);
  border-radius: 0.38rem;
  padding: clamp(0.2rem, 0.18rem + 0.12vw, 0.26rem);
  font-size: clamp(0.66rem, 0.64rem + 0.1vw, 0.72rem);
  font-family: "Lato", sans-serif;
  background: #161616;
  color: #f2f2f2;
}

select {
  inline-size: 100%;
  border: 0.0625rem solid color-mix(in srgb, #ffffff 25%, #111111 75%);
  border-radius: 0.38rem;
  padding: clamp(0.2rem, 0.18rem + 0.12vw, 0.26rem);
  font-size: clamp(0.66rem, 0.64rem + 0.1vw, 0.72rem);
  font-family: "Lato", sans-serif;
  background: #161616;
  color: #f2f2f2;
}

input[type="range"] {
  inline-size: 100%;
}

output {
  display: inline-block;
  font-size: clamp(0.62rem, 0.6rem + 0.1vw, 0.68rem);
  color: #d5d5d5;
}

.oil-match {
  margin: 0;
  padding: clamp(0.2rem, 0.18rem + 0.12vw, 0.26rem);
  border-radius: 0.45rem;
  background: color-mix(in srgb, #2a2a2a 80%, #111111 20%);
  font-size: clamp(0.64rem, 0.62rem + 0.1vw, 0.7rem);
  line-height: 1.25;
}

.medium-status {
  margin: 0;
  padding: clamp(0.18rem, 0.16rem + 0.1vw, 0.24rem);
  border-radius: 0.45rem;
  background: color-mix(in srgb, #2d2d2d 82%, #111111 18%);
  font-size: clamp(0.62rem, 0.6rem + 0.1vw, 0.68rem);
  color: #f2f2f2;
}

.button-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(0.2rem, 0.18rem + 0.1vw, 0.26rem);
  margin-top: clamp(0.2rem, 0.18rem + 0.1vw, 0.26rem);
}

.preset-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(0.18rem, 0.16rem + 0.1vw, 0.24rem);
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: clamp(0.24rem, 0.2rem + 0.12vw, 0.3rem);
}

.toggle-row input[type="checkbox"] {
  inline-size: clamp(0.78rem, 0.74rem + 0.16vw, 0.88rem);
  block-size: clamp(0.78rem, 0.74rem + 0.16vw, 0.88rem);
}

.material-card {
  border: 0.0625rem solid color-mix(in srgb, #ffffff 26%, #111111 74%);
  border-radius: 0.65rem;
  background: color-mix(in srgb, #222222 86%, #111111 14%);
  overflow: clip;
  align-self: start;
}

.material-card-select {
  cursor: pointer;
}

.material-card-select:focus-visible {
  outline: 0.125rem solid #ffe2b8;
  outline-offset: 0.125rem;
}

.material-card[data-active="true"] {
  border-color: color-mix(in srgb, #f0c78e 58%, #111 42%);
  box-shadow: 0 0 0 0.1rem color-mix(in srgb, #f0c78e 38%, transparent 62%);
}

.material-cards-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(0.6rem, 0.45rem + 0.7vw, 1rem);
  align-items: start;
}

.panel-col {
  display: flex;
  flex-direction: column;
  gap: clamp(0.5rem, 0.4rem + 0.4vw, 0.8rem);
}

.panel-header-row {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 0.4rem + 0.4vw, 0.8rem);
  overflow: hidden;
}

.panel-collapse-btn {
  flex-shrink: 0;
}

.chalk-col {
  display: flex;
  flex-direction: column;
  gap: clamp(1rem, 0.8rem + 1vw, 1.6rem);
}

.chalk-col .material-card {
  align-self: stretch;
}

.material-toggle {
  inline-size: auto;
  justify-self: start;
  margin: clamp(0.14rem, 0.12rem + 0.08vw, 0.18rem);
  border: 0.0625rem solid color-mix(in srgb, #ffffff 24%, #111111 76%);
  border-radius: 999px;
  background: color-mix(in srgb, #2d2d2d 88%, #161616 12%);
  font-weight: 700;
  padding: clamp(0.12rem, 0.1rem + 0.06vw, 0.16rem) clamp(0.28rem, 0.26rem + 0.1vw, 0.34rem);
  color: #ececec;
}

.material-toggle[aria-expanded="true"] {
  background: color-mix(in srgb, #343434 90%, #1a1a1a 10%);
}

.material-toggle[aria-pressed="true"] {
  color: #ffe6c1;
  font-weight: 800;
}

.material-panel {
  display: grid;
  gap: clamp(0.16rem, 0.14rem + 0.12vw, 0.28rem);
  padding: clamp(0.3rem, 0.24rem + 0.28vw, 0.5rem);
  overflow: visible;
}

.material-panel[hidden] {
  display: none;
}

.preset-row button[aria-pressed="true"] {
  background: #2f2f2f;
  color: #ffe3bd;
  border-color: color-mix(in srgb, #f0c78e 55%, #1f1f1f 45%);
}

button {
  font: inherit;
  border: 0.0625rem solid color-mix(in srgb, #ffffff 24%, #111111 76%);
  border-radius: 0.5rem;
  padding: clamp(0.2rem, 0.18rem + 0.1vw, 0.24rem);
  background: #1d1d1d;
  color: #f1f1f1;
  cursor: pointer;
  font-size: clamp(0.62rem, 0.6rem + 0.1vw, 0.7rem);
}

.button-row button {
  background: transparent !important;
  border: 2px solid #ffffff !important;
  border-radius: 0.5rem !important;
  color: #ffffff !important;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: clamp(0.35rem, 0.3rem + 0.2vw, 0.55rem) clamp(0.3rem, 0.25rem + 0.2vw, 0.45rem);
  transition: background 0.18s ease;
}

.button-row button:hover {
  background: rgba(255, 255, 255, 0.15) !important;
}

button[aria-pressed="true"] {
  background: #2a2a2a;
  color: #ffe2b8;
}

.paint-stage {
  display: grid;
}

.zoom-row {
  display: grid;
  grid-template-columns: auto auto auto minmax(0, 1fr) minmax(3.4rem, auto);
  align-items: center;
  gap: clamp(0.24rem, 0.2rem + 0.2vw, 0.45rem);
}

.zoom-row output {
  text-align: right;
  font-weight: 700;
}

.control-bottom-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(0.16rem, 0.14rem + 0.1vw, 0.2rem);
}

.control-bottom-block {
  display: grid;
  gap: clamp(0.1rem, 0.08rem + 0.08vw, 0.16rem);
}

.canvas-wrap {
  position: relative;
  border-radius: var(--radius);
  border: 0.0625rem solid color-mix(in srgb, #ffffff 28%, #121212 72%);
  min-block-size: clamp(22rem, 55vh, 48rem);
  overflow: clip;
  background: #0f0f0f;
}

.app-layout.panel-hidden .canvas-wrap {
  min-block-size: clamp(23rem, calc(100vh - 10rem), 125rem);
  min-block-size: clamp(23rem, calc(100dvh - 10rem), 125rem);
}

#canvasBg,
#canvasPaint {
  position: absolute;
  inset: 0;
  inline-size: 100%;
  block-size: 100%;
}

#canvasPaint {
  touch-action: none;
  cursor: crosshair;
}

footer {
  border-top: 1px solid color-mix(in srgb, hsl(198, 75%, 62%) 70%, transparent);
  margin-top: clamp(0.3rem, 0.24rem + 0.2vw, 0.45rem);
  padding: clamp(1rem, 2vw, 1.4rem) clamp(1.5rem, 5vw, 4rem);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

footer p {
  margin: 0;
  font-size: clamp(0.62rem, 1vw, 0.78rem);
  font-weight: 300;
  color: rgba(255, 255, 255, 0.8);
  letter-spacing: 0.04em;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.2rem, 3vw, 2.5rem);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  font-size: clamp(0.62rem, 1vw, 0.78rem);
  font-weight: 300;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-underline-offset: 0.18rem;
}

@media (min-width: 64rem) {
  .app-layout {
    grid-template-columns: minmax(18rem, 23rem) minmax(0, 1fr);
  }

  .app-layout:not(.panel-hidden) .canvas-wrap {
    min-block-size: clamp(14rem, 34vh, 21rem);
  }
}

@media (max-width: 63.9rem) {
  .intro {
    white-space: normal;
    text-align: left;
  }

  .panel-col {
    gap: clamp(1rem, 4vw, 1.5rem);
  }
}

@media (max-width: 34rem) {
  .material-cards-row {
    grid-template-columns: 1fr;
  }

  .button-row {
    grid-template-columns: 1fr;
  }
}

@media (max-height: 52rem) {
  .tester-header {
    padding-top: clamp(0.3rem, 0.28rem + 0.08vw, 0.38rem);
    padding-bottom: clamp(0.3rem, 0.28rem + 0.08vw, 0.38rem);
  }

  .intro {
    display: none;
  }

  .control-panel {
    padding: clamp(0.45rem, 0.38rem + 0.25vw, 0.65rem);
    gap: clamp(0.14rem, 0.12rem + 0.1vw, 0.22rem);
  }

  .material-panel {
    gap: clamp(0.1rem, 0.08rem + 0.08vw, 0.16rem);
    padding: clamp(0.2rem, 0.16rem + 0.15vw, 0.3rem);
  }

  .material-toggle {
    margin: clamp(0.08rem, 0.07rem + 0.05vw, 0.12rem);
  }

  footer {
    padding: 0.4rem clamp(1rem, 3vw, 2rem);
  }
}

.app-layout:not(.panel-hidden) .paint-stage {
  display: none;
}

.app-layout:not(.panel-hidden) {
  grid-template-columns: 1fr;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}