:root {
  --bg: #070a16;
  --ink: #eef1ff;
  --muted: #8d95b8;
  --glass: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.12);
  --accent: #7df9ff;
  --accent-2: #ff6ec7;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: "Space Mono", "Black Han Sans", monospace;
  -webkit-font-smoothing: antialiased;
}

#stage {
  position: fixed;
  inset: 0;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

/* ---------- title ---------- */
.title {
  position: fixed;
  top: 28px;
  left: 32px;
  pointer-events: none;
  user-select: none;
}
.title h1 {
  margin: 0;
  font-size: clamp(40px, 7vw, 96px);
  line-height: 0.88;
  letter-spacing: -0.04em;
  font-weight: 700;
  background: linear-gradient(120deg, var(--accent) 0%, #b69cff 45%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 24px rgba(125, 249, 255, 0.25));
}
.title p {
  margin: 12px 0 0;
  font-family: "Black Han Sans", sans-serif;
  font-size: 18px;
  color: var(--muted);
  letter-spacing: 0.2em;
}

/* ---------- panel ---------- */
.panel {
  position: fixed;
  top: 24px;
  right: 24px;
  width: 280px;
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  font-size: 13px;
}
.panel summary {
  cursor: pointer;
  list-style: none;
  font-family: "Black Han Sans", sans-serif;
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--muted);
  user-select: none;
}
.panel summary::-webkit-details-marker { display: none; }
.panel summary::after { content: " ▾"; }
.panel:not([open]) summary::after { content: " ▸"; }
.panel[open] summary { margin-bottom: 12px; }

.row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.row label, .row .label {
  flex: 0 0 52px;
  color: var(--muted);
  font-family: "Black Han Sans", sans-serif;
}

input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
}

.seg {
  flex: 1;
  display: flex;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.seg button {
  flex: 1;
  padding: 6px 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.seg button + button { border-left: 1px solid var(--line); }
.seg button.on {
  background: rgba(125, 249, 255, 0.15);
  color: var(--accent);
}

.msg input {
  flex: 1;
  min-width: 0;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.25);
  color: var(--ink);
  font: inherit;
  font-family: "Black Han Sans", "Space Mono", sans-serif;
  font-size: 14px;
  outline: none;
}
.msg input:focus { border-color: var(--accent); }
.msg button {
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: #06121a;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.actions { justify-content: space-between; }
.wipe {
  flex: 1;
  padding: 10px 12px;
  border: 0;
  border-radius: 12px;
  background: linear-gradient(120deg, var(--accent-2), #b69cff);
  color: #14061a;
  font-family: "Black Han Sans", sans-serif;
  font-size: 15px;
  cursor: pointer;
  transition: transform 0.12s;
}
.wipe:active { transform: scale(0.96); }
.wipe kbd {
  margin-left: 6px;
  padding: 1px 5px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.18);
  font-family: "Space Mono", monospace;
  font-size: 10px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-family: "Black Han Sans", sans-serif;
  cursor: pointer;
  user-select: none;
}
.toggle input { accent-color: var(--accent); width: 16px; height: 16px; }

.stats {
  display: flex;
  justify-content: space-between;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: "Black Han Sans", sans-serif;
  font-size: 12px;
}
.stats b {
  margin-left: 4px;
  color: var(--ink);
  font-family: "Space Mono", monospace;
}

.hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
  font-family: "Black Han Sans", sans-serif;
  opacity: 0.8;
}

/* ---------- mobile ---------- */
@media (max-width: 700px) {
  .title { top: 18px; left: 16px; }
  .title p { font-size: 13px; margin-top: 8px; }
  .panel {
    top: 16px;
    right: 16px;
    width: min(260px, calc(100vw - 32px));
    padding: 10px 12px 12px;
  }
  .panel:not([open]) { width: auto; }
  .hint { display: none; }
}