:root {
  --bg: #05060a;
  --panel: rgba(14, 16, 24, 0.82);
  --panel-solid: #0e1018;
  --stroke: rgba(255, 255, 255, 0.10);
  --text: #eef1f8;
  --muted: #9aa3b8;
  --accent: #7c3aed;
  --accent2: #22d3ee;
  --radius: 14px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.55);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

#stage {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
}

body.ui-hidden .hud,
body.ui-hidden .menu { opacity: 0; pointer-events: none; }

/* ---------- HUD ---------- */
.hud {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  z-index: 20;
  transition: opacity .35s ease;
  background: linear-gradient(180deg, rgba(0,0,0,.45), transparent);
  pointer-events: none;
}
.hud > * { pointer-events: auto; }

.hud-brand {
  font-weight: 800;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 15px;
}
.hud-sub {
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--muted);
  margin-left: 7px;
  font-size: 12px;
  text-transform: uppercase;
}
.dot {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--accent2);
  box-shadow: 0 0 14px var(--accent2);
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{transform:scale(1);opacity:1} 50%{transform:scale(.6);opacity:.5} }

.hud-status {
  margin-left: auto;
  color: var(--muted);
  font-size: 13px;
}

/* ---------- Buttons ---------- */
.icon-btn {
  width: 42px; height: 42px;
  border-radius: 11px;
  border: 1px solid var(--stroke);
  background: var(--panel);
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
  backdrop-filter: blur(12px);
  transition: transform .12s ease, background .2s ease, border-color .2s;
}
.icon-btn:hover { background: rgba(40,44,60,.9); border-color: var(--accent); }
.icon-btn:active { transform: scale(.94); }

.mini-btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 13px;
  border-radius: 10px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.04);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: background .2s, border-color .2s;
}
.mini-btn:hover { background: rgba(255,255,255,.09); border-color: var(--accent); }
.mini-btn.active { border-color: var(--accent2); background: rgba(34,211,238,.12); }

kbd {
  background: rgba(255,255,255,.10);
  border: 1px solid var(--stroke);
  border-radius: 6px;
  padding: 1px 7px;
  font-size: 12px;
  font-family: inherit;
}

/* ---------- Start overlay ---------- */
.overlay {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  z-index: 40;
  background: radial-gradient(1200px 700px at 50% 30%, rgba(124,58,237,.18), transparent 60%), rgba(3,4,8,.78);
  backdrop-filter: blur(6px);
  transition: opacity .5s ease;
}
.overlay.hidden { opacity: 0; pointer-events: none; }

.start-card {
  width: min(560px, 92vw);
  text-align: center;
  padding: 40px 34px;
  border-radius: 22px;
  border: 1px solid var(--stroke);
  background: var(--panel);
  box-shadow: var(--shadow);
  animation: rise .6s cubic-bezier(.2,.8,.2,1) both;
}
@keyframes rise { from{opacity:0;transform:translateY(18px)} to{opacity:1;transform:none} }

.title {
  font-size: 58px;
  margin: 0;
  letter-spacing: 8px;
  font-weight: 900;
  background: linear-gradient(90deg, var(--accent2), var(--accent));
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.tagline { color: var(--muted); margin: 8px 0 28px; font-size: 15px; }

.source-picker { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 480px){ .source-picker{ grid-template-columns:1fr; } }

.source-btn {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 22px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.03);
  cursor: pointer;
  transition: transform .15s ease, border-color .2s, background .2s;
}
.source-btn:hover { transform: translateY(-3px); border-color: var(--accent); background: rgba(124,58,237,.12); }
.src-icon { font-size: 30px; }
.src-title { font-weight: 700; font-size: 16px; }
.src-desc { color: var(--muted); font-size: 12px; }

.hint { margin-top: 26px; color: var(--muted); font-size: 12.5px; }

/* ---------- Menu ---------- */
.menu {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: min(360px, 90vw);
  background: var(--panel);
  backdrop-filter: blur(18px);
  border-left: 1px solid var(--stroke);
  box-shadow: var(--shadow);
  z-index: 30;
  display: flex; flex-direction: column;
  transform: translateX(100%);
  transition: transform .32s cubic-bezier(.2,.8,.2,1), opacity .3s;
}
.menu.open { transform: translateX(0); }

.menu-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 18px 12px;
  border-bottom: 1px solid var(--stroke);
}
.menu-head h2 { margin: 0; font-size: 18px; letter-spacing: .5px; }

.menu-body { padding: 16px 18px; overflow-y: auto; flex: 1; }
.menu-body::-webkit-scrollbar { width: 8px; }
.menu-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,.12); border-radius: 8px; }

.field { margin-bottom: 20px; }
.field > label {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12.5px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--muted); margin-bottom: 10px;
}
.val { color: var(--accent2); font-weight: 700; letter-spacing: 0; text-transform: none; }

.chip-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 13px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.03);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: background .18s, border-color .18s, color .18s;
}
.chip:hover { border-color: var(--accent); }
.chip.active {
  background: linear-gradient(90deg, rgba(124,58,237,.35), rgba(34,211,238,.25));
  border-color: var(--accent2);
  color: #fff;
}

.chip-grid.palette { gap: 10px; }
.swatch {
  width: 34px; height: 34px; border-radius: 10px;
  border: 2px solid transparent; cursor: pointer;
  transition: transform .15s, border-color .15s;
}
.swatch:hover { transform: scale(1.08); }
.swatch.active { border-color: #fff; box-shadow: 0 0 0 2px rgba(0,0,0,.4); }

input[type="range"] {
  width: 100%;
  -webkit-appearance: none; appearance: none;
  height: 5px; border-radius: 5px;
  background: rgba(255,255,255,.14);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent2);
  cursor: pointer; box-shadow: 0 0 12px rgba(34,211,238,.6);
}
input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px; border: none; border-radius: 50%;
  background: var(--accent2); cursor: pointer;
}

.toggle-row { display: flex; align-items: center; justify-content: space-between; }
.toggle-row > label { margin: 0; }
input[type="checkbox"] {
  width: 44px; height: 24px; -webkit-appearance: none; appearance: none;
  background: rgba(255,255,255,.16); border-radius: 999px; position: relative; cursor: pointer;
  transition: background .2s;
}
input[type="checkbox"]::after {
  content: ""; position: absolute; top: 3px; left: 3px;
  width: 18px; height: 18px; border-radius: 50%; background: #fff; transition: transform .2s;
}
input[type="checkbox"]:checked { background: var(--accent); }
input[type="checkbox"]:checked::after { transform: translateX(20px); }

.src-switch { display: flex; gap: 10px; }
.player { width: 100%; margin-top: 12px; }
.player[hidden] { display: none; }

.menu-foot {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; border-top: 1px solid var(--stroke);
}
.fps { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }