:root {
  --bg: #0a0c12;
  --surface: #12161f;
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text: #e8ecf4;
  --muted: #9aa4b5;
  --faint: #6b7484;
  --grad: linear-gradient(120deg, #a3e635, #34d399 55%, #2dd4a8);
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 Inter, -apple-system, BlinkMacSystemFont, sans-serif;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  padding: 0 24px 80px;
}

/* subtle ambient glow, same family as the main site */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(600px 400px at 20% 0%, rgba(163, 230, 53, 0.07), transparent 70%),
    radial-gradient(700px 500px at 90% 20%, rgba(45, 212, 168, 0.07), transparent 70%);
}

/* ------------------------------------------------------------------- topbar */
.topbar { max-width: 960px; margin: 0 auto; padding: 22px 0; }

.home {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  text-decoration: none;
  font: 500 13px/1 var(--mono);
  transition: color 0.2s;
}
.home:hover { color: var(--text); }
.home svg { width: 26px; height: 26px; display: block; }

/* --------------------------------------------------------------------- main */
main { max-width: 960px; margin: 0 auto; padding-top: 34px; }

.eyebrow {
  font: 500 12px/1 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 14px;
}

h1 {
  font-size: clamp(32px, 5.5vw, 52px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.08;
}

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  color: var(--muted);
  max-width: 54ch;
  margin-top: 14px;
  font-size: 16.5px;
}

/* ------------------------------------------------------------------ seedbar */
.seedbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin: 30px 0 0;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  max-width: 560px;
}

.seedbar label {
  font: 500 12px/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
  padding-left: 6px;
}

.seedbar input {
  flex: 1 1 180px;
  min-width: 0;
  background: #0a0c12;
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--text);
  font: 400 15px/1 var(--mono);
  padding: 11px 13px;
  outline: none;
  transition: border-color 0.2s;
}
.seedbar input::placeholder { color: var(--faint); }
.seedbar input:focus { border-color: #34d399; }

.btn {
  border: 1px solid transparent;
  border-radius: 999px;
  font: 600 14px/1 Inter, sans-serif;
  padding: 11px 20px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
}
.btn.primary {
  background: var(--grad);
  color: #0a0c12;
  box-shadow: 0 4px 20px rgba(163, 230, 53, 0.28);
}
.btn.primary:hover { transform: translateY(-1px); box-shadow: 0 6px 26px rgba(163, 230, 53, 0.38); }
.btn.ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn.ghost:hover { border-color: #34d399; color: #34d399; }

/* -------------------------------------------------------------------- frame */
#frame { margin-top: 30px; }

#container {
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
  width: 100%;
  max-width: 720px;
  aspect-ratio: 1 / 1;
  line-height: 0;
}

/* p5 writes inline width/height on the canvas — override so it scales */
#container canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
  /* let the browser own vertical panning so the page still scrolls when a
     swipe starts on the canvas; horizontal gestures stay ours for rotation */
  touch-action: pan-y;
}

.actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 16px;
  max-width: 720px;
}

.seedtag {
  font: 400 12.5px/1 var(--mono);
  color: var(--faint);
  margin-right: auto;
  word-break: break-all;
}

#download { display: inline-block; }

@media (max-width: 560px) {
  .seedbar { padding: 12px; }
  .seedbar label { display: none; }
}

/* -------------------------------------------------------------------- about */
.about {
  margin-top: 54px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  max-width: 720px;
}

.about h2 {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-bottom: 14px;
}

.about ol {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 15px;
}

.about li { margin: 9px 0; }
.about li b { color: var(--text); font-weight: 600; }

.about .note {
  margin-top: 18px;
  font: 400 12.5px/1.6 var(--mono);
  color: var(--faint);
}

.hint {
  margin-top: 12px;
  font: 400 12.5px/1.5 var(--mono);
  color: var(--faint);
  max-width: 720px;
}
#container { cursor: grab; }
#container:active { cursor: grabbing; }