:root {
  color-scheme: only light;
  --ink: #131a1b;
  --muted: #3c4a4b;
  --bg: #f6f1e6;
  --panel: rgba(255, 255, 255, 0.78);
  --panel-border: rgba(19, 26, 27, 0.16);
  --accent: #ffb64a;
  --accent-strong: #ea7b2c;
  --teal: #0a7b76;
  --teal-soft: rgba(10, 123, 118, 0.18);
  --cell-alive: #0a7b76;
  --cell-dead: rgba(10, 123, 118, 0.08);
  --cell-stroke: rgba(19, 26, 27, 0.18);
  --shadow: 0 20px 50px rgba(19, 26, 27, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

.atmosphere {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 12% 18%, rgba(255, 197, 110, 0.6), transparent 55%),
    radial-gradient(circle at 85% 15%, rgba(10, 123, 118, 0.18), transparent 50%),
    linear-gradient(120deg, #f7efe1 0%, #f2f5ee 45%, #f7efe7 100%);
  z-index: 0;
  overflow: hidden;
}

.atmosphere > div {
  position: absolute;
  inset: 0;
}

.glow {
  background: radial-gradient(circle at 70% 70%, rgba(255, 255, 255, 0.65), transparent 45%);
  opacity: 0.9;
}

.gridlines {
  background-image:
    linear-gradient(60deg, rgba(10, 123, 118, 0.08) 0 1px, transparent 1px 26px),
    linear-gradient(-60deg, rgba(10, 123, 118, 0.08) 0 1px, transparent 1px 26px),
    linear-gradient(0deg, rgba(19, 26, 27, 0.05) 0 1px, transparent 1px 26px);
  opacity: 0.5;
}

.grain {
  background-image: radial-gradient(rgba(19, 26, 27, 0.08) 0.8px, transparent 0.8px);
  background-size: 3px 3px;
  opacity: 0.2;
  mix-blend-mode: multiply;
}

.page {
  position: relative;
  z-index: 1;
  padding: 2.5rem 6vw 4rem;
  max-width: 1200px;
  margin: 0 auto;
}

.back-link {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.9rem;
  border: 1px solid transparent;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.55);
  transition: border 0.2s ease, color 0.2s ease;
}

.back-link:hover {
  border-color: var(--panel-border);
  color: var(--ink);
}

.hero {
  margin: 2.2rem 0 2.6rem;
  max-width: 680px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 0.6rem;
}

h1 {
  font-family: "Chakra Petch", "Trebuchet MS", sans-serif;
  font-size: clamp(2.2rem, 2.2vw + 1.7rem, 3.6rem);
  margin: 0 0 0.8rem;
}

.subtitle {
  margin: 0;
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.6;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.panel {
  background: var(--panel);
  border-radius: 20px;
  padding: 1.6rem 1.5rem 1.7rem;
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.panel-head h2 {
  margin: 0 0 0.4rem;
  font-family: "Chakra Petch", "Trebuchet MS", sans-serif;
  font-size: 1.4rem;
}

.panel-head p {
  margin: 0 0 1.4rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.field {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 1.1rem;
}

label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

input[type="number"],
input[type="range"] {
  width: 100%;
  font-family: "IBM Plex Mono", "Courier New", monospace;
}

input[type="number"] {
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  padding: 0.55rem 0.7rem;
  background: rgba(255, 255, 255, 0.9);
  font-size: 1rem;
}

input[type="number"]:focus {
  outline: 2px solid rgba(255, 182, 74, 0.6);
}

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

.range-readout {
  font-size: 0.85rem;
  color: var(--muted);
}

.button-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
  margin: 1.2rem 0 1.3rem;
}

button {
  border: none;
  padding: 0.7rem 0.9rem;
  border-radius: 12px;
  font-family: "Chakra Petch", "Trebuchet MS", sans-serif;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

button:active {
  transform: translateY(1px);
}

.primary {
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: #1d1206;
  box-shadow: 0 12px 25px rgba(234, 123, 44, 0.3);
}

.ghost {
  background: rgba(255, 255, 255, 0.8);
  color: var(--ink);
  border: 1px solid var(--panel-border);
}

.rule-note {
  font-size: 0.9rem;
  line-height: 1.4;
  color: var(--muted);
  margin: 0 0 0.6rem;
}

.hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.board {
  display: grid;
  gap: 1rem;
}

.board-meta {
  display: flex;
  gap: 1.4rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.stat span {
  font-family: "Chakra Petch", "Trebuchet MS", sans-serif;
  color: var(--ink);
}

.canvas-shell {
  background: rgba(255, 255, 255, 0.65);
  border-radius: 26px;
  padding: 1rem;
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
  min-height: 520px;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.6);
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  animation: reveal 0.7s ease forwards;
  animation-delay: var(--delay, 0s);
}

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

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .canvas-shell {
    min-height: 420px;
  }
}

@media (max-width: 600px) {
  .page {
    padding: 2.2rem 5vw 3.2rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .reveal {
    animation: none;
    opacity: 1;
    transform: none;
  }
}