:root {
  /* Impossible-crayon cyberpunk palette — neon waxy strokes on dark paper */
  --c-gradient: #00f0ff; /* electric cyan */
  --c-oracle: #ffb300; /* molten amber */
  --c-path: #39ff14; /* toxic green */
  --c-accepted: #ff2d95; /* hot magenta */
  --c-bracket: #8a8fa3; /* ashen grey */
  --c-iterate: #ff6a00; /* burning orange */

  --bg: #0a0812; /* near-black plum paper */
  --bg-2: #120d20; /* slightly lifted */
  --panel-bg: #150f24; /* panel slab */
  --panel-bg-2: #1c1433;
  --ink: #f4e9ff; /* chalky lavender-white */
  --muted: #9a8fbf; /* dusty violet */
  --border: #2c2247; /* faint neon-lined edge */

  --neon-glow: 0 0 6px currentColor, 0 0 14px currentColor;
  --crayon-shadow: 0 2px 0 rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(255, 45, 149, 0.08), transparent 60%),
    radial-gradient(1000px 500px at -10% 20%, rgba(0, 240, 255, 0.07), transparent 55%),
    radial-gradient(800px 800px at 50% 120%, rgba(57, 255, 20, 0.05), transparent 60%), var(--bg);
  background-attachment: fixed;
  line-height: 1.6;
}

/* subtle waxy paper grain over everything */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.05;
  background-image:
    repeating-linear-gradient(45deg, #fff 0, #fff 1px, transparent 1px, transparent 3px),
    repeating-linear-gradient(-45deg, #fff 0, #fff 1px, transparent 1px, transparent 4px);
  mix-blend-mode: overlay;
}

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

.site-header {
  position: relative;
  z-index: 2;
  padding: 3.5rem 1.5rem 2.5rem;
  text-align: center;
  background:
    linear-gradient(160deg, rgba(255, 45, 149, 0.1), transparent 40%),
    linear-gradient(200deg, rgba(0, 240, 255, 0.1), transparent 45%), var(--bg-2);
  border-bottom: 1px solid var(--border);
}

.site-header h1 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.5rem, 4.5vw, 2.6rem);
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #fff;
  text-shadow:
    0 0 4px var(--c-oracle),
    0 0 16px rgba(255, 179, 0, 0.55),
    2px 3px 0 rgba(0, 0, 0, 0.6);
}

.subtitle {
  margin: 0;
  color: var(--c-gradient);
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
  font-weight: 500;
}

/* Global panel — a glowing crayon slab */
.global-panel {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 100;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow:
    0 0 0 1px rgba(0, 240, 255, 0.1),
    0 8px 28px rgba(0, 0, 0, 0.55),
    0 0 24px rgba(255, 45, 149, 0.12);
  width: 220px;
  font-size: 0.82rem;
  backdrop-filter: blur(4px);
}

.panel-toggle {
  width: 100%;
  border: none;
  background: linear-gradient(90deg, var(--c-accepted), var(--c-iterate));
  color: #fff;
  padding: 0.55rem;
  border-radius: 12px 12px 0 0;
  cursor: pointer;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.panel-toggle:hover {
  filter: brightness(1.15) saturate(1.2);
}

.panel-body {
  padding: 0.8rem;
  max-height: 70vh;
  overflow-y: auto;
}

.panel-body.collapsed {
  display: none;
}

.control-group {
  margin-bottom: 1rem;
}

.control-group > label {
  display: block;
  font-weight: 700;
  margin-bottom: 0.35rem;
  color: var(--c-path);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 0.72rem;
  text-shadow: 0 0 8px rgba(57, 255, 20, 0.4);
}

.thumbs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
}

.thumbs canvas {
  width: 100%;
  aspect-ratio: 1;
  border: 2px solid transparent;
  border-radius: 7px;
  cursor: pointer;
  background: var(--panel-bg-2);
  transition:
    box-shadow 0.15s,
    border-color 0.15s;
}

.thumbs canvas:hover {
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.5);
}

.thumbs canvas.selected {
  border-color: var(--c-iterate);
  box-shadow: 0 0 14px rgba(255, 106, 0, 0.7);
}

.coord-row {
  display: flex;
  gap: 5px;
}

.coord-row input {
  width: 50%;
}

input[type='number'] {
  padding: 0.3rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--bg);
  color: var(--ink);
}

input[type='number']:focus {
  outline: none;
  border-color: var(--c-gradient);
  box-shadow: 0 0 8px rgba(0, 240, 255, 0.5);
}

.transport {
  display: flex;
  gap: 5px;
}

.transport button {
  flex: 1;
  padding: 0.45rem;
  border: 1px solid var(--border);
  background: var(--panel-bg-2);
  color: var(--ink);
  border-radius: 7px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.15s;
}

.transport button:hover {
  background: var(--c-gradient);
  color: #06131a;
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.6);
  border-color: var(--c-gradient);
}

.chk {
  display: block;
  font-weight: 400 !important;
  color: var(--muted) !important;
  text-transform: none !important;
  letter-spacing: normal !important;
  font-size: 0.82rem !important;
  text-shadow: none !important;
}

input[type='range'] {
  width: 100%;
  accent-color: var(--c-accepted);
}

small {
  color: var(--muted);
}

/* Story sections: scrollytelling layout */
main#story {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
  padding: 4rem 0;
  border-top: 1px solid var(--border);
}

.section .prose {
  max-width: 46ch;
}

.section .prose h2 {
  margin-top: 0;
  color: #fff;
  text-shadow:
    0 0 4px var(--c-accepted),
    0 0 16px rgba(255, 45, 149, 0.4);
}

.section .prose a {
  color: var(--c-gradient);
  text-decoration: none;
  border-bottom: 1px dashed rgba(0, 240, 255, 0.5);
}

.section .prose a:hover {
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.7);
}

.section .viz {
  position: sticky;
  top: 1rem;
}

.viz canvas {
  width: 100%;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: block;
  box-shadow:
    inset 0 0 40px rgba(0, 0, 0, 0.5),
    0 0 22px rgba(255, 45, 149, 0.1);
}

.viz .panel-controls {
  margin-top: 0.75rem;
  padding: 0.8rem;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.85rem;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.4);
}

.viz .panel-controls label {
  display: block;
  margin: 0.35rem 0 0.1rem;
  color: var(--muted);
}

.readout {
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 0.78rem;
  color: var(--c-path);
  margin-top: 0.5rem;
  white-space: pre-wrap;
  text-shadow: 0 0 8px rgba(57, 255, 20, 0.3);
}

.aside-box {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  background: linear-gradient(120deg, rgba(255, 179, 0, 0.1), rgba(255, 106, 0, 0.05));
  border-left: 4px solid var(--c-oracle);
  border-radius: 6px;
  font-size: 0.9rem;
  box-shadow: -8px 0 20px -12px rgba(255, 179, 0, 0.5);
}

.callout {
  margin-top: 1rem;
  padding: 0.5rem 0.8rem;
  font-size: 0.82rem;
  color: var(--muted);
  border-left: 3px solid var(--c-gradient);
  box-shadow: -6px 0 16px -10px rgba(0, 240, 255, 0.6);
}

.warn-banner {
  margin-top: 0.5rem;
  padding: 0.55rem 0.8rem;
  font-size: 0.8rem;
  background: linear-gradient(120deg, rgba(255, 45, 149, 0.14), rgba(255, 45, 149, 0.04));
  border-left: 4px solid var(--c-accepted);
  border-radius: 6px;
  color: #ffd9ec;
  box-shadow: -8px 0 20px -12px rgba(255, 45, 149, 0.6);
}

.btn {
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel-bg-2);
  color: var(--ink);
  cursor: pointer;
  margin: 0.15rem;
  font-weight: 600;
  transition: all 0.15s;
}

.btn:hover {
  background: var(--c-gradient);
  color: #06131a;
  border-color: var(--c-gradient);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.6);
}

.btn.active {
  background: linear-gradient(90deg, var(--c-accepted), var(--c-iterate));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 0 14px rgba(255, 45, 149, 0.6);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.75rem;
  margin-top: 0.5rem;
  color: var(--muted);
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.swatch {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  display: inline-block;
  box-shadow: 0 0 8px currentColor;
}

.preset-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.4rem;
}

table.eq-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  margin-top: 1rem;
  color: var(--ink);
}

table.eq-table td,
table.eq-table th {
  border: 1px solid var(--border);
  padding: 0.4rem 0.5rem;
  text-align: left;
}

table.eq-table th {
  background: var(--panel-bg-2);
  color: var(--c-oracle);
  text-shadow: 0 0 8px rgba(255, 179, 0, 0.4);
}

table.eq-table tr {
  cursor: pointer;
}

table.eq-table tbody tr:hover {
  background: rgba(0, 240, 255, 0.08);
  box-shadow: inset 0 0 12px rgba(0, 240, 255, 0.15);
}

code {
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  background: var(--panel-bg-2);
  color: var(--c-path);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.site-footer {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem 1rem 3rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: var(--bg-2);
}

/* Neon-crayon scrollbars */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--c-accepted), var(--c-iterate));
  border-radius: 6px;
  border: 2px solid var(--bg);
}

::-selection {
  background: var(--c-accepted);
  color: #fff;
}

/* Narrow screens: stack, canvas above prose */
@media (max-width: 820px) {
  .section {
    grid-template-columns: 1fr;
  }

  .section .viz {
    position: static;
    order: -1;
  }

  .global-panel {
    width: 180px;
  }
}