:root {
  --selected-color: #6f57ff;
  --selected-rgb: 111, 87, 255;
  --page-ink: rgba(255, 255, 255, 0.98);
  --page-muted: rgba(255, 255, 255, 0.72);
  --glass: rgba(10, 13, 28, 0.38);
  --glass-soft: rgba(255, 255, 255, 0.13);
  --glass-border: rgba(255, 255, 255, 0.22);
  --shadow: rgba(3, 6, 18, 0.28);
  --control-bg: rgba(255, 255, 255, 0.12);
  --control-border: rgba(255, 255, 255, 0.24);
  --focus-ring: rgba(255, 255, 255, 0.82);
  --shell-top-space: clamp(5.5rem, 9vw, 8rem);
  --shell-bottom-space: clamp(2rem, 5vw, 4rem);
  --motion-fast: 160ms;
  --motion-base: 260ms;
  --motion-slow: 440ms;
  --ease-standard: cubic-bezier(0.2, 0.7, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  overflow-x: hidden;
  color: var(--page-ink);
  background:
    radial-gradient(circle at 15% 8%, rgba(255, 255, 255, 0.2), transparent 27rem),
    radial-gradient(circle at 88% 82%, rgba(255, 255, 255, 0.1), transparent 32rem),
    var(--selected-color);
  transition: background-color var(--motion-slow) var(--ease-standard), color var(--motion-base) var(--ease-standard);
}

button,
input {
  font: inherit;
}

button {
  border: 1px solid var(--control-border);
  border-radius: 0.85rem;
  color: var(--page-ink);
  background: var(--glass-soft);
  box-shadow: 0 0.45rem 1rem rgba(0, 0, 0, 0.08);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.055em;
  padding: 0.86rem 1rem;
  text-transform: uppercase;
  transition:
    background-color var(--motion-fast) var(--ease-standard),
    border-color var(--motion-fast) var(--ease-standard),
    box-shadow var(--motion-fast) var(--ease-standard),
    color var(--motion-fast) var(--ease-standard),
    transform var(--motion-fast) var(--ease-out);
}

button:hover {
  background: rgba(255, 255, 255, 0.23);
  box-shadow: 0 0.7rem 1.35rem rgba(0, 0, 0, 0.12);
  transform: translateY(-2px) scale(1.01);
}

button:active {
  transform: translateY(0) scale(0.985);
}

button:focus-visible,
input:focus-visible,
.focus-toggle:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.app-shell {
  display: grid;
  gap: clamp(1.5rem, 5vw, 5.5rem);
  grid-template-columns: minmax(0, 1fr) minmax(19rem, 27rem);
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100svh;
  padding: var(--shell-top-space) clamp(1rem, 5vw, 5.5rem) var(--shell-bottom-space);
  place-items: center;
  width: min(100%, 94rem);
  transition:
    opacity var(--motion-base) var(--ease-standard),
    transform var(--motion-slow) var(--ease-out),
    visibility var(--motion-base) var(--ease-standard);
}

.color-hero {
  animation: hero-arrive 560ms var(--ease-out) both;
  justify-self: stretch;
  text-align: center;
  text-shadow: 0 0.18rem 1.1rem var(--shadow);
  transition: color var(--motion-base) var(--ease-standard), text-shadow var(--motion-base) var(--ease-standard);
}

.eyebrow,
.panel-kicker {
  color: var(--page-muted);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  margin: 0 0 0.6rem;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2rem, 6vw, 5.6rem);
  letter-spacing: -0.075em;
  line-height: 0.96;
  margin: 0;
}

.current-color {
  align-items: center;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-top: clamp(1.25rem, 4vw, 2.4rem);
}

.current-color strong {
  font-size: clamp(3.1rem, 10vw, 9.4rem);
  font-weight: 850;
  letter-spacing: -0.105em;
  line-height: 0.85;
}

.current-color span {
  color: var(--page-muted);
  font-size: clamp(0.9rem, 2vw, 1.2rem);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.current-color strong,
.current-color span {
  transition: color var(--motion-base) var(--ease-standard), text-shadow var(--motion-base) var(--ease-standard);
}

.control-panel {
  animation: panel-arrive 620ms var(--ease-out) 40ms both;
  align-self: center;
  backdrop-filter: blur(28px) saturate(145%);
  -webkit-backdrop-filter: blur(28px) saturate(145%);
  background: linear-gradient(145deg, var(--glass-soft), var(--glass));
  border: 1px solid var(--glass-border);
  border-radius: 1.7rem;
  box-shadow: 0 1.6rem 4rem var(--shadow), inset 0 1px rgba(255, 255, 255, 0.18);
  max-height: calc(100vh - var(--shell-top-space) - var(--shell-bottom-space));
  max-height: calc(100svh - var(--shell-top-space) - var(--shell-bottom-space));
  overflow: auto;
  overscroll-behavior: contain;
  padding: clamp(1.1rem, 3vw, 1.5rem);
  scroll-behavior: smooth;
  scrollbar-color: var(--control-border) transparent;
  scrollbar-width: thin;
  transition:
    border-color var(--motion-base) var(--ease-standard),
    box-shadow var(--motion-base) var(--ease-standard),
    color var(--motion-base) var(--ease-standard);
  width: 100%;
}

.control-panel > form {
  transform-origin: center top;
  transition: opacity var(--motion-base) var(--ease-standard), transform var(--motion-base) var(--ease-out);
}

.reset-in-progress .control-panel > form {
  opacity: 0.74;
  transform: scale(0.992);
}

.reset-in-progress .current-color {
  animation: reset-settle 620ms var(--ease-out) both;
}

.panel-heading,
.section-heading,
.slider-label {
  align-items: center;
  display: flex;
  justify-content: space-between;
}

h2 {
  font-size: 1.6rem;
  letter-spacing: -0.045em;
  margin: 0;
}

h3 {
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  margin: 0;
  text-transform: uppercase;
}

.privacy-pill,
.section-heading span {
  color: var(--page-muted);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.privacy-pill {
  border: 1px solid var(--control-border);
  border-radius: 999px;
  padding: 0.38rem 0.55rem;
  transition:
    border-color var(--motion-base) var(--ease-standard),
    color var(--motion-base) var(--ease-standard),
    transform var(--motion-fast) var(--ease-out);
}

.error-message {
  background: rgba(255, 85, 98, 0.16);
  border: 1px solid rgba(255, 180, 185, 0.42);
  border-radius: 0.8rem;
  color: var(--page-ink);
  font-size: 0.78rem;
  font-weight: 720;
  line-height: 1.45;
  max-height: 8rem;
  margin: 1rem 0 0;
  opacity: 1;
  overflow: hidden;
  padding: 0.65rem 0.75rem;
  transform: translateY(0);
  transition:
    background-color var(--motion-base) var(--ease-standard),
    border-color var(--motion-base) var(--ease-standard),
    margin-top var(--motion-base) var(--ease-standard),
    max-height var(--motion-base) var(--ease-standard),
    opacity var(--motion-fast) var(--ease-standard),
    padding var(--motion-base) var(--ease-standard),
    transform var(--motion-base) var(--ease-out),
    visibility 0s linear 0s;
  visibility: visible;
}

.error-message:empty {
  border-color: transparent;
  margin-top: 0;
  max-height: 0;
  opacity: 0;
  padding-block: 0;
  transform: translateY(-0.4rem);
  transition-delay: 0s, 0s, 0s, 0s, 0s, 0s, 0s, var(--motion-base);
  visibility: hidden;
}

.control-section {
  border-top: 1px solid var(--glass-border);
  margin-top: 1.1rem;
  padding-top: 1rem;
  transition: border-color var(--motion-base) var(--ease-standard);
}

.input-action-row {
  display: grid;
  gap: 0.55rem;
  grid-template-columns: minmax(0, 1fr) auto;
  margin-top: 0.65rem;
}

input[type="text"],
input[type="number"] {
  background: var(--control-bg);
  border: 1px solid var(--control-border);
  border-radius: 0.85rem;
  color: var(--page-ink);
  font-weight: 720;
  min-width: 0;
  padding: 0.82rem 0.85rem;
  transition:
    background-color var(--motion-fast) var(--ease-standard),
    border-color var(--motion-fast) var(--ease-standard),
    box-shadow var(--motion-fast) var(--ease-standard),
    color var(--motion-fast) var(--ease-standard),
    transform var(--motion-fast) var(--ease-out);
  width: 100%;
}

input[type="text"]:hover,
input[type="number"]:hover {
  border-color: var(--focus-ring);
}

input[type="text"]:focus,
input[type="number"]:focus {
  background: var(--glass-soft);
  box-shadow: 0 0 0 0.22rem rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

input[aria-invalid="true"] {
  border-color: rgba(255, 180, 185, 0.82);
  box-shadow: 0 0 0 0.22rem rgba(255, 85, 98, 0.14);
}

.value-grid {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0.65rem 0;
}

.value-grid.four-columns {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.value-grid label {
  color: var(--page-muted);
  font-size: 0.7rem;
  font-weight: 780;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.value-grid input {
  display: block;
  margin-top: 0.34rem;
}

.fallback-submit {
  margin-top: 0.65rem;
  width: 100%;
}

.input-action-row .fallback-submit {
  margin-top: 0;
  width: auto;
}

.implicit-submit {
  height: 1px;
  left: -100vw;
  opacity: 0;
  padding: 0;
  pointer-events: none;
  position: fixed;
  top: 0;
  width: 1px;
}

.slider-stack {
  display: grid;
  gap: 0.72rem;
  margin: 0.72rem 0;
}

.slider-label {
  color: var(--page-muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
  text-transform: uppercase;
}

output {
  color: var(--page-ink);
  font-variant-numeric: tabular-nums;
  transition: color var(--motion-base) var(--ease-standard), opacity var(--motion-fast) var(--ease-standard);
}

input[type="range"] {
  accent-color: var(--page-ink);
  cursor: pointer;
  display: block;
  margin: 0;
  touch-action: none;
  transition:
    accent-color var(--motion-base) var(--ease-standard),
    opacity var(--motion-fast) var(--ease-standard);
  width: 100%;
}

input[type="range"]:active {
  opacity: 0.96;
}

.mode-note {
  color: var(--page-muted);
  font-size: 0.72rem;
  line-height: 1.45;
  margin: 1rem 0 0;
  transition: color var(--motion-base) var(--ease-standard), opacity var(--motion-base) var(--ease-standard);
}

.live-note {
  display: none;
}

.wasm-ready .server-note {
  display: none;
}

.wasm-ready .live-note {
  animation: note-arrive var(--motion-slow) var(--ease-out) both;
  display: block;
}

.reset-flow {
  border-top: 1px solid var(--glass-border);
  margin-top: 1rem;
  padding-top: 1rem;
  position: relative;
}

.reset-checkbox {
  height: 1px;
  opacity: 0;
  position: absolute;
  width: 1px;
}

.reset-trigger,
.reset-cancel {
  align-items: center;
  border: 1px solid rgba(255, 180, 185, 0.42);
  border-radius: 0.85rem;
  color: var(--page-ink);
  cursor: pointer;
  display: flex;
  font-size: 0.74rem;
  font-weight: 780;
  justify-content: center;
  letter-spacing: 0.07em;
  padding: 0.76rem 0.9rem;
  text-align: center;
  text-transform: uppercase;
  transition:
    background-color var(--motion-fast) var(--ease-standard),
    border-color var(--motion-fast) var(--ease-standard),
    box-shadow var(--motion-fast) var(--ease-standard),
    color var(--motion-fast) var(--ease-standard),
    transform var(--motion-fast) var(--ease-out);
}

.reset-trigger {
  background: rgba(255, 85, 98, 0.12);
}

.reset-trigger:hover,
.reset-cancel:hover {
  background: rgba(255, 85, 98, 0.2);
  box-shadow: 0 0.6rem 1.2rem rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.reset-checkbox:focus-visible + .reset-trigger {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.open-reset,
.close-reset {
  display: inline-block;
  overflow: hidden;
  transition:
    max-width var(--motion-base) var(--ease-standard),
    opacity var(--motion-fast) var(--ease-standard),
    transform var(--motion-base) var(--ease-out);
  white-space: nowrap;
}

.open-reset {
  max-width: 12rem;
  opacity: 1;
  transform: translateX(0);
}

.close-reset {
  max-width: 0;
  opacity: 0;
  transform: translateX(0.35rem);
}

.reset-checkbox:checked + .reset-trigger .open-reset {
  max-width: 0;
  opacity: 0;
  transform: translateX(-0.35rem);
}

.reset-checkbox:checked + .reset-trigger .close-reset {
  max-width: 12rem;
  opacity: 1;
  transform: translateX(0);
}

.reset-confirmation {
  background: rgba(255, 85, 98, 0.13);
  border: 1px solid transparent;
  border-radius: 0.95rem;
  max-height: 0;
  margin-top: 0;
  opacity: 0;
  overflow: hidden;
  padding: 0 0.8rem;
  transform: translateY(-0.55rem);
  transition:
    border-color var(--motion-base) var(--ease-standard),
    margin-top var(--motion-base) var(--ease-standard),
    max-height 320ms var(--ease-standard),
    opacity var(--motion-base) var(--ease-standard),
    padding var(--motion-base) var(--ease-standard),
    transform var(--motion-base) var(--ease-out),
    visibility 0s linear 320ms;
  visibility: hidden;
}

.reset-checkbox:checked ~ .reset-confirmation {
  border-color: rgba(255, 180, 185, 0.42);
  max-height: 13rem;
  margin-top: 0.72rem;
  opacity: 1;
  padding: 0.82rem;
  transform: translateY(0);
  transition-delay: 0s;
  visibility: visible;
}

.reset-confirmation strong {
  display: block;
  font-size: 0.92rem;
}

.reset-confirmation p {
  color: var(--page-muted);
  font-size: 0.76rem;
  line-height: 1.45;
  margin: 0.35rem 0 0.72rem;
}

.reset-actions {
  display: grid;
  gap: 0.55rem;
  grid-template-columns: 1fr 1fr;
}

.reset-actions form {
  display: contents;
}

.reset-cancel {
  background: var(--control-bg);
  border-color: var(--control-border);
}

.reset-confirm-button {
  background: rgba(255, 85, 98, 0.22);
  border-color: rgba(255, 180, 185, 0.56);
  width: 100%;
}

.focus-checkbox {
  height: 1px;
  left: -100vw;
  opacity: 0;
  position: fixed;
  top: 0;
  width: 1px;
}

.focus-toggle {
  align-items: center;
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  box-shadow: 0 0.8rem 2rem var(--shadow);
  color: var(--page-ink);
  cursor: pointer;
  display: flex;
  font-size: 0.72rem;
  font-weight: 820;
  gap: 0.5rem;
  letter-spacing: 0.09em;
  padding: 0.72rem 0.9rem;
  position: absolute;
  right: clamp(0.8rem, 3vw, 1.5rem);
  text-transform: uppercase;
  top: clamp(0.8rem, 3vw, 1.5rem);
  transition:
    background-color var(--motion-fast) var(--ease-standard),
    border-color var(--motion-fast) var(--ease-standard),
    box-shadow var(--motion-fast) var(--ease-standard),
    color var(--motion-fast) var(--ease-standard),
    transform var(--motion-fast) var(--ease-out);
  z-index: 3;
}

.focus-toggle:hover {
  transform: translateY(-2px);
}

.focus-icon {
  border: 2px solid currentColor;
  border-radius: 0.15rem;
  display: block;
  height: 0.78rem;
  opacity: 0.75;
  transition: opacity var(--motion-fast) var(--ease-standard), transform var(--motion-base) var(--ease-out);
  width: 0.78rem;
}

.enter-focus,
.leave-focus {
  display: inline-block;
  overflow: hidden;
  transition:
    max-width var(--motion-base) var(--ease-standard),
    opacity var(--motion-fast) var(--ease-standard),
    transform var(--motion-base) var(--ease-out);
  white-space: nowrap;
}

.enter-focus {
  max-width: 10rem;
  opacity: 1;
  transform: translateX(0);
}

.leave-focus {
  max-width: 0;
  opacity: 0;
  transform: translateX(0.35rem);
}

.focus-checkbox:checked ~ .focus-toggle .focus-icon {
  opacity: 0.92;
  transform: rotate(90deg) scale(0.92);
}

.focus-checkbox:checked ~ .focus-toggle .enter-focus {
  max-width: 0;
  opacity: 0;
  transform: translateX(-0.35rem);
}

.focus-checkbox:checked ~ .focus-toggle .leave-focus {
  max-width: 10rem;
  opacity: 1;
  transform: translateX(0);
}

.focus-checkbox:checked ~ .focus-toggle {
  position: fixed;
}

.focus-checkbox:checked ~ .app-shell {
  opacity: 0;
  pointer-events: none;
  transform: scale(1.035);
  visibility: hidden;
}

.site-footer {
  color: var(--page-muted);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  padding: 0.65rem 1rem;
  text-align: center;
  text-shadow: 0 0.12rem 0.6rem var(--shadow);
  transition:
    color var(--motion-base) var(--ease-standard),
    opacity var(--motion-base) var(--ease-standard),
    visibility var(--motion-base) var(--ease-standard);
  width: 100%;
}

.focus-checkbox:checked ~ .site-footer {
  opacity: 0;
  visibility: hidden;
}

.visually-hidden {
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

@keyframes hero-arrive {
  from {
    opacity: 0;
    transform: translateY(0.6rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes panel-arrive {
  from {
    opacity: 0;
    transform: translateY(0.85rem) scale(0.985);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes note-arrive {
  from {
    opacity: 0;
    transform: translateY(-0.25rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes reset-settle {
  0% {
    opacity: 0.68;
    transform: scale(0.975);
  }

  52% {
    opacity: 1;
    transform: scale(1.018);
  }

  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@media (max-width: 860px) {
  .app-shell {
    grid-template-columns: 1fr;
    padding-top: 5.5rem;
  }

  .control-panel {
    max-height: none;
    width: min(100%, 34rem);
  }
}

@media (max-width: 420px) {
  .app-shell {
    gap: 1.35rem;
    padding-inline: 0.72rem;
  }

  .current-color strong {
    font-size: clamp(2.8rem, 18vw, 4.5rem);
  }

  .control-panel {
    border-radius: 1.35rem;
  }

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

  .value-grid.four-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}