:root {
  --bg: #fafafa;
  --fg: #111111;
  --muted: #666666;
  --border: #e5e5e5;
  --panel: #ffffff;
  --accent: #111111;
  --cone-r: rgba(220, 38, 38, 0.22);
  --cone-g: rgba(22, 163, 74, 0.20);
  --cone-b: rgba(37, 99, 235, 0.20);
  --radius: 12px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(0,0,0,0.06), 0 10px 24px rgba(0,0,0,0.08);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
}

.current {
  color: var(--fg);
  text-decoration: underline;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.4;
}

nav {
  display: flex;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(10px);
}

nav a {
  color: var(--fg);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 999px;
}

nav a:hover {
  background: rgba(0,0,0,0.04);
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px;
}

.app__header {
  margin: 12px 0 16px;
}

.app__header--with-mark {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.app__header--with-mark::before {
  content: "";
  position: absolute;
  inset: -24px;
  pointer-events: none;
  background-image:
    /* 1:2:0.1 cone mosaic (R:G:B) by dot count: 10 red, 20 green, 1 blue per tile */
    radial-gradient(circle at 10px 12px, var(--cone-r) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 34px 18px, var(--cone-r) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 58px 10px, var(--cone-r) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 82px 22px, var(--cone-r) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 106px 14px, var(--cone-r) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 18px 46px, var(--cone-r) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 46px 54px, var(--cone-r) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 70px 42px, var(--cone-r) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 94px 58px, var(--cone-r) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 114px 44px, var(--cone-r) 0 2.6px, transparent 2.8px),

    radial-gradient(circle at 22px 10px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 46px 26px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 70px 14px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 94px 30px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 118px 22px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 10px 34px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 34px 40px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 58px 34px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 82px 46px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 106px 36px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 26px 62px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 50px 70px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 74px 60px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 98px 74px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 122px 62px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 14px 86px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 38px 92px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 62px 84px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 86px 96px, var(--cone-g) 0 2.6px, transparent 2.8px),
    radial-gradient(circle at 110px 88px, var(--cone-g) 0 2.6px, transparent 2.8px),

    radial-gradient(circle at 76px 78px, var(--cone-b) 0 2.6px, transparent 2.8px);
  background-size: 128px 128px;
  opacity: 0.30;
  mix-blend-mode: multiply;
}

.app__header--with-mark > * {
  position: relative;
  z-index: 1;
}

.app__mark {
  width: 48px;
  height: 48px;
  color: var(--fg);
}

.app__mark svg {
  display: block;
  width: 100%;
  height: 100%;
}

.app__title {
  font-size: 28px;
  margin: 0;
  letter-spacing: -0.02em;
}

.brand {
  display: inline-block;
}

.brand::after {
  content: "";
  display: block;
  height: 10px;
  margin-top: 6px;
  border-radius: 6px;
  outline: 1px solid var(--border);
  outline-offset: 0;
  /* Three discrete bars (R/G/B) with small separators */
  background-image:
    linear-gradient(
      90deg,
      var(--cone-r) 0 32.5%,
      transparent 32.5% 34%,
      var(--cone-g) 34% 66.5%,
      transparent 66.5% 68%,
      var(--cone-b) 68% 100%
    ),
    linear-gradient(
      90deg,
      var(--cone-r) 0 32.5%,
      transparent 32.5% 34%,
      var(--cone-g) 34% 66.5%,
      transparent 66.5% 68%,
      var(--cone-b) 68% 100%
    ),
    linear-gradient(
      90deg,
      var(--cone-r) 0 32.5%,
      transparent 32.5% 34%,
      var(--cone-g) 34% 66.5%,
      transparent 66.5% 68%,
      var(--cone-b) 68% 100%
    ),
    linear-gradient(
      90deg,
      var(--cone-r) 0 32.5%,
      transparent 32.5% 34%,
      var(--cone-g) 34% 66.5%,
      transparent 66.5% 68%,
      var(--cone-b) 68% 100%
    );
}

.app__subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  max-width: 70ch;
}

.app__layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 16px;
  align-items: start;
}

@media (max-width: 960px) {
  .app__layout {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 12px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.panel__section {
  padding: 12px 0;
  border-top: 1px solid var(--border);
}

.panel__section:first-child {
  border-top: 0;
  padding-top: 0;
}

.panel__section--actions {
  display: grid;
  gap: 10px;
}

.panel__title {
  font-size: 14px;
  margin: 0 0 8px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.field {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.field__label {
  font-size: 12px;
  color: var(--muted);
}

.field__value {
  font-size: 12px;
  color: var(--muted);
}

.toggle {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 14px;
}

input[type="file"],
select,
input[type="range"] {
  width: 100%;
}

select {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: var(--radius-sm);
  padding: 10px 10px;
  font-size: 14px;
}

input[type="file"] {
  font-size: 14px;
}

input[type="range"] {
  accent-color: var(--accent);
}

.btn {
  appearance: none;
  border: 1px solid rgba(0,0,0,0.12);
  background: var(--accent);
  color: #fff;
  padding: 10px 12px;
  font-size: 14px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.btn:hover {
  filter: brightness(1.03);
}

.btn:active {
  transform: translateY(1px);
}

.btn--secondary {
  background: transparent;
  color: var(--fg);
}

.btn--secondary:hover {
  background: rgba(0,0,0,0.04);
}

.btn:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 2px solid rgba(17,17,17,0.35);
  outline-offset: 2px;
}

.status {
  margin: 0;
  color: var(--muted);
  min-height: 18px;
  font-size: 12px;
}

.viewer {
  min-width: 0;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 960px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

.tile {
  margin: 0;
  border: 1px solid var(--border);
  background: #fff;
  padding: 10px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.tile__title {
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 8px;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  background: #f0f0f0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}