:root {
  --bg: #060b14;
  --bg-deep: #040810;
  --panel: #0b1422;
  --panel-raised: #101b2c;
  --line: rgba(125, 211, 252, 0.16);
  --line-strong: rgba(125, 211, 252, 0.3);
  --text: #eaf2ff;
  --text-dim: #a9bcd8;
  --text-mute: #8195b3;
  --accent: #5eead4;
  --accent-2: #38bdf8;
  --focus: #7ee7ff;
  --danger: #fb7185;
  --radius-lg: 20px;
  --radius-md: 13px;
  --font-ui: "Segoe UI", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  color: var(--text);
  font-family: var(--font-ui);
  background:
    radial-gradient(1100px 700px at 12% -14%, rgba(56, 189, 248, 0.16), transparent 62%),
    radial-gradient(900px 640px at 108% 2%, rgba(147, 51, 234, 0.13), transparent 58%),
    radial-gradient(720px 520px at 50% 118%, rgba(45, 212, 191, 0.11), transparent 62%),
    var(--bg);
  overflow: hidden;
  overscroll-behavior: none;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.055) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 25%, transparent 80%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 25%, transparent 80%);
}

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

:where(button, input, canvas, [tabindex]):focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

#lab:focus-visible {
  outline-offset: -4px;
  border-radius: 16px;
}

/* ---------- Layout ---------- */

.app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
  height: 100vh;
  height: 100dvh;
  max-width: 1680px;
  margin: 0 auto;
  padding: 18px 22px 20px;
}

.header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  flex: none;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.logo {
  flex: none;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(155deg, rgba(94, 234, 212, 0.16), rgba(56, 189, 248, 0.08));
  border: 1px solid rgba(94, 234, 212, 0.28);
  box-shadow: 0 0 26px -8px rgba(45, 212, 191, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.logo svg {
  width: 32px;
  height: 32px;
}

.brand-text {
  min-width: 0;
}

h1 {
  margin: 0;
  font-size: clamp(1.55rem, 1.1rem + 1.5vw, 2.1rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.025em;
}

h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--accent) 0%, var(--accent-2) 70%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  margin: 5px 0 0;
  max-width: 88ch;
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.45;
}

.chips {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding-top: 4px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid rgba(94, 234, 212, 0.28);
  background: rgba(9, 20, 32, 0.7);
  color: #c9f7ee;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}

.chip-quiet {
  border-color: var(--line);
  color: var(--text-mute);
  letter-spacing: 0.04em;
  text-transform: none;
  font-weight: 500;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 9px var(--accent);
  animation: pulse 2.2s ease-in-out infinite;
}

.chip.is-paused {
  border-color: rgba(251, 191, 36, 0.35);
  color: #fde68a;
}

.chip.is-paused .dot {
  background: #fbbf24;
  box-shadow: 0 0 9px #fbbf24;
  animation: none;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.82); }
}

.layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 336px;
  gap: 16px;
}

/* ---------- Stage ---------- */

.stage {
  position: relative;
  min-width: 0;
  min-height: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(120% 110% at 50% 0%, #0c1828 0%, #060c16 62%);
  box-shadow:
    0 36px 90px -54px rgba(56, 189, 248, 0.65),
    0 20px 50px -30px rgba(0, 0, 0, 0.9),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

.stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  box-shadow:
    inset 0 0 90px rgba(2, 6, 12, 0.72),
    inset 0 0 0 1px rgba(255, 255, 255, 0.025);
}

#lab {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: crosshair;
  -webkit-tap-highlight-color: transparent;
}

.stage-tag {
  position: absolute;
  top: 12px;
  left: 14px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(125, 211, 252, 0.16);
  background: rgba(5, 11, 20, 0.6);
  color: #7f97b6;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  pointer-events: none;
  backdrop-filter: blur(6px);
}

.tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.stage.is-paused .tag-dot {
  background: #fbbf24;
  box-shadow: 0 0 8px #fbbf24;
}

.hint {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 6px;
  max-width: calc(100% - 28px);
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(125, 211, 252, 0.24);
  background: rgba(7, 14, 25, 0.78);
  color: #d3e6fb;
  font-size: 0.78rem;
  white-space: nowrap;
  pointer-events: none;
  backdrop-filter: blur(8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.hint-sep {
  color: #5f7695;
}

.hint kbd {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  padding: 3px 5px;
  border-radius: 5px;
  background: #17263c;
  border: 1px solid rgba(148, 163, 184, 0.35);
  color: #dbeafe;
}

.hint.is-hidden {
  opacity: 0;
  transform: translate(-50%, 10px);
}

.noscript {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  padding: 24px;
  color: var(--text);
  background: rgba(4, 8, 16, 0.9);
  text-align: center;
}

/* ---------- Panel ---------- */

.panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 0;
  padding: 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(17, 28, 46, 0.92) 0%, rgba(8, 15, 26, 0.95) 100%);
  box-shadow:
    0 24px 60px -40px rgba(0, 0, 0, 0.9),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: #26364f transparent;
}

.panel::-webkit-scrollbar {
  width: 8px;
}

.panel::-webkit-scrollbar-thumb {
  background: #26364f;
  border-radius: 99px;
}

.group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: none;
}

.group-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

h2 {
  margin: 0;
  color: var(--text-mute);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.group-note {
  color: #617894;
  font-size: 0.68rem;
}

.tools {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.tool {
  --tool-color: #94a3b8;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 66px;
  padding: 11px 6px 9px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.16);
  background: #0f1a2b;
  color: #d8e6f7;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.1;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: transform 0.13s ease, border-color 0.13s ease, background 0.13s ease, box-shadow 0.13s ease;
}

.tool:hover {
  background: #16253a;
  border-color: rgba(148, 163, 184, 0.34);
  transform: translateY(-1px);
}

.tool:active {
  transform: translateY(0) scale(0.98);
}

.tool[aria-pressed="true"] {
  border-color: var(--tool-color);
  background: #182840;
  background: linear-gradient(180deg, color-mix(in srgb, var(--tool-color) 17%, #0f1a2b) 0%, #0f1a2b 82%);
  color: #ffffff;
  box-shadow:
    0 0 0 1px var(--tool-color) inset,
    0 10px 24px -16px var(--tool-color);
}

.tool[aria-pressed="true"]::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 16px;
  right: 16px;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: var(--tool-color);
  box-shadow: 0 0 12px var(--tool-color);
}

.tool .key {
  position: absolute;
  top: 6px;
  right: 7px;
  color: #6f86a5;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  line-height: 1;
}

.tool[aria-pressed="true"] .key {
  color: rgba(255, 255, 255, 0.75);
}

.swatch {
  width: 26px;
  height: 26px;
  border-radius: 9px;
  background: var(--tool-color);
  box-shadow:
    inset 0 -8px 12px rgba(0, 0, 0, 0.3),
    inset 0 6px 10px rgba(255, 255, 255, 0.16),
    0 0 16px -5px var(--tool-color);
}

.tool[data-material="1"] { --tool-color: #f6c453; }
.tool[data-material="2"] { --tool-color: #38bdf8; }
.tool[data-material="3"] { --tool-color: #94a3b8; }
.tool[data-material="4"] { --tool-color: #fb7185; }
.tool[data-material="5"] { --tool-color: #4ade80; }
.tool[data-material="0"] { --tool-color: #f472b6; }

.tool[data-material="1"] .swatch {
  background: radial-gradient(circle at 32% 26%, #ffe9ab 0%, #f6c453 52%, #c68f2d 100%);
}
.tool[data-material="2"] .swatch {
  background: radial-gradient(circle at 30% 24%, #a9ecff 0%, #38bdf8 54%, #0f73b6 100%);
}
.tool[data-material="3"] .swatch {
  background: repeating-linear-gradient(135deg, #9aabc0 0 4px, #68778c 4px 8px);
}
.tool[data-material="4"] .swatch {
  background: radial-gradient(circle at 50% 74%, #ffe28f 0%, #ff8a3d 52%, #d61f3b 100%);
}
.tool[data-material="5"] .swatch {
  background: radial-gradient(circle at 34% 28%, #b4f8d0 0%, #4ade80 54%, #13803e 100%);
}
.tool[data-material="0"] .swatch {
  background: repeating-conic-gradient(#e5edf7 0% 25%, #93a5bb 0% 50%) 50% / 12px 12px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.4);
}

/* Brush size */

.range-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: #d8e6f7;
  font-size: 0.82rem;
  font-weight: 600;
}

output {
  min-width: 40px;
  padding: 5px 9px;
  border-radius: 999px;
  border: 1px solid rgba(125, 211, 252, 0.3);
  background: #0a1524;
  color: #7dd3fc;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  text-align: center;
}

input[type="range"] {
  --fill: 26%;
  width: 100%;
  height: 24px;
  margin: 0;
  padding: 0;
  background: transparent;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, #2dd4bf 0%, #38bdf8 var(--fill), #1b2a42 var(--fill), #1b2a42 100%);
  border: 1px solid rgba(148, 163, 184, 0.18);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  margin-top: -7px;
  border: 0;
  border-radius: 50%;
  background: #eaf6ff;
  box-shadow:
    0 0 0 3px rgba(56, 189, 248, 0.32),
    0 2px 8px rgba(0, 0, 0, 0.55);
}

input[type="range"]::-moz-range-track {
  height: 8px;
  border-radius: 999px;
  background: #1b2a42;
  border: 1px solid rgba(148, 163, 184, 0.18);
}

input[type="range"]::-moz-range-progress {
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(90deg, #2dd4bf, #38bdf8);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border: 0;
  border-radius: 50%;
  background: #eaf6ff;
  box-shadow:
    0 0 0 3px rgba(56, 189, 248, 0.32),
    0 2px 8px rgba(0, 0, 0, 0.55);
}

.help {
  margin: -2px 0 0;
  color: #7188a6;
  font-size: 0.72rem;
  line-height: 1.4;
}

/* Actions */

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

#pauseBtn {
  grid-column: 1 / -1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: #131f32;
  color: #e2eefc;
  font-family: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.13s ease, border-color 0.13s ease, transform 0.13s ease, filter 0.13s ease;
}

.btn:hover {
  background: #1a2a42;
  border-color: rgba(148, 163, 184, 0.4);
}

.btn:active {
  transform: scale(0.985);
}

.btn-primary {
  border-color: transparent;
  background: linear-gradient(120deg, #5eead4 0%, #38bdf8 100%);
  color: #03131c;
  font-weight: 800;
  letter-spacing: 0.01em;
  box-shadow: 0 12px 26px -14px rgba(56, 189, 248, 0.9);
}

.btn-primary:hover {
  background: linear-gradient(120deg, #6cf1dd 0%, #52c8fb 100%);
  border-color: transparent;
  filter: brightness(1.02);
}

/* Notes */

.rules {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid rgba(148, 163, 184, 0.14);
  flex: none;
}

.rules ul {
  display: grid;
  gap: 8px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  color: #a8bbd6;
  font-size: 0.78rem;
  line-height: 1.4;
}

.rules li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
}

.bullet {
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 4px;
  border-radius: 50%;
  background: var(--c, #94a3b8);
  box-shadow: 0 0 9px -1px var(--c, #94a3b8);
}

/* ---------- Responsive ---------- */

@media (max-width: 1000px) {
  .layout {
    grid-template-columns: minmax(0, 1fr) 300px;
  }

  .panel {
    padding: 16px;
  }
}

@media (max-width: 900px) {
  body {
    overflow-y: auto;
  }

  .app {
    height: auto;
    min-height: 100dvh;
    padding: 14px 14px 18px;
    gap: 12px;
  }

  .header {
    align-items: center;
  }

  .logo {
    width: 42px;
    height: 42px;
    border-radius: 12px;
  }

  .logo svg {
    width: 28px;
    height: 28px;
  }

  .tagline {
    font-size: 0.8rem;
    line-height: 1.4;
  }

  .layout {
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-height: 0;
  }

  .stage {
    flex: none;
    height: clamp(220px, 32dvh, 320px);
    min-height: 0;
    border-radius: 16px;
  }

  .help {
    display: none;
  }

  .panel {
    gap: 12px;
    padding: 14px;
    border-radius: 16px;
    overflow: visible;
  }

  .tools {
    gap: 7px;
  }

  .tool {
    flex-direction: row;
    justify-content: flex-start;
    gap: 9px;
    min-height: 48px;
    padding: 8px 10px;
    font-size: 0.82rem;
  }

  .tool .key {
    position: static;
    margin-left: auto;
    opacity: 0.72;
  }

  .tool[aria-pressed="true"]::after {
    top: 8px;
    bottom: 8px;
    left: -1px;
    right: auto;
    width: 3px;
    height: auto;
    border-radius: 0 4px 4px 0;
  }

  .swatch {
    width: 24px;
    height: 24px;
    border-radius: 8px;
    flex: none;
  }

  .actions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  #pauseBtn {
    grid-column: auto;
  }

  .btn {
    min-height: 44px;
    padding: 9px 8px;
    font-size: 0.84rem;
  }

  .rules {
    margin-top: 0;
    padding-top: 12px;
  }

  .rules ul {
    grid-template-columns: 1fr 1fr;
    gap: 8px 14px;
    font-size: 0.76rem;
  }
}

@media (max-width: 620px) {
  .app {
    padding: 10px 10px 12px;
    gap: 10px;
  }

  .layout {
    gap: 10px;
  }

  .brand {
    gap: 10px;
  }

  h1 {
    font-size: 1.42rem;
  }

  .tagline {
    grid-column: 1 / -1;
  }

  .chips {
    padding-top: 0;
  }

  .chip {
    height: 26px;
    padding: 0 10px;
    font-size: 0.62rem;
  }

  .stage {
    height: clamp(210px, 28dvh, 280px);
  }

  .panel {
    gap: 11px;
    padding: 12px;
  }

  .hint {
    font-size: 0.74rem;
    padding: 7px 12px;
  }
}

@media (max-height: 700px) and (min-width: 901px) {
  .panel {
    padding: 14px;
  }

  .tool {
    min-height: 58px;
  }

  .rules {
    display: none;
  }
}

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