:root {
  color-scheme: dark;
  --bg: #0a0710;
  --ink: #f3ecff;
  --ink-dim: rgba(243, 236, 255, 0.62);
  --card: rgba(20, 14, 32, 0.72);
  --border: rgba(255, 255, 255, 0.10);
  --accent: #b98cff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
  overflow: hidden;
  overscroll-behavior: none;
}

#viz {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

/* Gate */
.gate {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: radial-gradient(120% 120% at 50% 20%, rgba(185, 140, 255, 0.14), transparent 60%), var(--bg);
  transition: opacity .5s ease, visibility .5s ease;
  z-index: 5;
}
.gate.hidden { opacity: 0; visibility: hidden; pointer-events: none; }

.gate-card {
  max-width: 420px;
  width: 100%;
  text-align: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 32px;
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.45);
}
.gate-mark { font-size: 44px; line-height: 1; margin-bottom: 10px; }
.gate-card h1 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: 0.01em;
  background: linear-gradient(135deg, #f3ecff, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.gate-card p {
  margin: 0 0 24px;
  color: var(--ink-dim);
  font-size: 14.5px;
  line-height: 1.5;
}
.gate-hint {
  margin: 14px 0 0 !important;
  font-size: 12.5px !important;
  line-height: 1.5;
  color: var(--ink-dim);
  opacity: 0.8;
}
.gate-status {
  min-height: 18px;
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--ink-dim);
}
.gate-status.error { color: #ff9d9d; }

.gate-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: stretch;
}

.btn-primary, .btn-secondary {
  appearance: none;
  border: none;
  cursor: pointer;
  padding: 13px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn-primary {
  color: #17091f;
  background: linear-gradient(135deg, #e2c9ff, var(--accent));
  box-shadow: 0 8px 24px rgba(185, 140, 255, 0.35);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(185, 140, 255, 0.45); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.6; cursor: default; transform: none; }

.btn-secondary {
  color: var(--ink);
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
}
.btn-secondary:hover { transform: translateY(-1px); background: rgba(255,255,255,0.1); }
.btn-secondary:active { transform: translateY(0); }
.btn-secondary:disabled { opacity: 0.6; cursor: default; transform: none; }

/* HUD */
.hud {
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  z-index: 4;
  transition: opacity .4s ease, transform .4s ease;
  width: min(94vw, 640px);
}
.hud.hidden { opacity: 0; pointer-events: none; transform: translate(-50%, 12px); }
.hud.faded { opacity: 0.18; }

.hud-row {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  justify-content: center;
}

.seg {
  display: flex;
  gap: 2px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px;
  backdrop-filter: blur(14px);
  flex: 1;
  justify-content: space-between;
  overflow-x: auto;
}
.seg-btn {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--ink-dim);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s ease, color .15s ease;
}
.seg-btn:hover { color: var(--ink); }
.seg-btn.active {
  background: rgba(185, 140, 255, 0.22);
  color: var(--ink);
}

.hud-actions {
  display: flex;
  gap: 6px;
}
.icon-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--ink);
  width: 40px;
  height: 40px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(14px);
  transition: background .15s ease, transform .15s ease;
  flex-shrink: 0;
}
.icon-btn:hover { background: rgba(185, 140, 255, 0.18); }
.icon-btn:active { transform: scale(0.94); }

.meter-row { gap: 12px; }
.meter-label { font-size: 11px; color: var(--ink-dim); text-transform: uppercase; letter-spacing: 0.08em; flex-shrink: 0; }
.meter {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
  min-width: 40px;
}
.meter-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), #ff9dce);
  transition: width .08s linear;
}
.hint {
  font-size: 11px;
  color: var(--ink-dim);
  white-space: nowrap;
  display: none;
}
@media (min-width: 720px) {
  .hint { display: inline; }
}

.toast {
  position: fixed;
  top: 22px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--card);
  border: 1px solid var(--border);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  backdrop-filter: blur(14px);
  z-index: 6;
  transition: opacity .3s ease, transform .3s ease;
}
.toast.hidden { opacity: 0; transform: translate(-50%, -10px); pointer-events: none; }

@media (max-width: 480px) {
  .gate-card { padding: 32px 22px; }
  .seg-btn { padding: 8px 10px; font-size: 12px; }
}