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

html, body {
  width: 100%; height: 100%;
  background: #05060f;
  font-family: 'Segoe UI', system-ui, sans-serif;
  color: #eef0ff;
  overflow: hidden;
}

canvas.webgl { display: block; }

.overlay {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse at 50% 30%, #141a3a 0%, #05060f 70%);
  z-index: 10;
}

.overlay.hidden, .hidden { display: none !important; }

.card {
  width: min(420px, 92vw);
  max-height: 92vh;
  overflow-y: auto;
  background: rgba(18, 22, 48, 0.85);
  border: 1px solid rgba(120, 140, 255, 0.25);
  border-radius: 18px;
  padding: 32px 28px;
  backdrop-filter: blur(12px);
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}

.card h1 { font-size: 26px; margin-bottom: 6px; }
.card .sub { color: #9aa3c7; margin-bottom: 22px; font-size: 14px; }

.card label {
  display: block; font-size: 13px; color: #9aa3c7; margin-bottom: 14px;
}

.card input {
  display: block; width: 100%; margin-top: 5px;
  padding: 11px 13px;
  background: rgba(8, 10, 26, 0.9);
  border: 1px solid rgba(120, 140, 255, 0.25);
  border-radius: 10px;
  color: #eef0ff; font-size: 15px;
  outline: none;
}
.card input:focus { border-color: #6c7dff; }

.card button {
  display: block; width: 100%;
  margin-top: 12px; padding: 13px;
  border: 1px solid rgba(120, 140, 255, 0.3);
  border-radius: 12px;
  background: rgba(40, 48, 96, 0.6);
  color: #eef0ff; font-size: 15px; font-weight: 600;
  cursor: pointer;
}
.card button:hover { background: rgba(60, 70, 130, 0.7); }
.card button.primary {
  background: linear-gradient(135deg, #5b6cff, #8a5bff);
  border: none;
}
.card button.primary:hover { filter: brightness(1.15); }
.card button:disabled { opacity: .5; cursor: wait; }

#legend2d {
  position: fixed;
  right: 10px;
  bottom: 8px;
  z-index: 5;
  font-size: 11px;
  color: rgba(200, 206, 235, 0.55);
  background: rgba(10, 12, 30, 0.55);
  padding: 6px 12px;
  border-radius: 8px;
  pointer-events: none;
}
#legend2d b { color: rgba(200, 206, 235, 0.75); }

.error {
  background: rgba(200, 40, 60, 0.2);
  border: 1px solid rgba(255, 80, 100, 0.4);
  color: #ffb3bd;
  padding: 10px 12px; border-radius: 10px;
  font-size: 13px; margin-bottom: 6px;
}