* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at center, rgba(22, 28, 45, 0.2), rgba(3, 5, 10, 0.95) 68%),
    linear-gradient(180deg, #070b14 0%, #04060a 100%);
  color: #eff4ff;
  font-family: "Trebuchet MS", "Segoe UI", Arial, sans-serif;
}

canvas {
  display: block;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 42%, rgba(255, 255, 255, 0.03), transparent 32%),
    radial-gradient(circle at 50% 50%, transparent 45%, rgba(0, 0, 0, 0.55) 100%);
  mix-blend-mode: screen;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 100% 3px;
  opacity: 0.07;
}

.hidden {
  display: none !important;
}

#overlay {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(1, 2, 6, 0.72);
  backdrop-filter: blur(8px);
}

.panel {
  width: min(92vw, 520px);
  padding: 24px 22px 18px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(14, 18, 30, 0.96), rgba(7, 10, 18, 0.96));
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.55);
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  padding: 7px 12px;
  border: 1px solid rgba(124, 192, 255, 0.25);
  border-radius: 999px;
  color: #8fd2ff;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  background: rgba(44, 74, 110, 0.18);
}

.panel h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 0.98;
  letter-spacing: 0.02em;
}

.panel p {
  margin: 14px 0 0;
  color: #d8e4ff;
  line-height: 1.55;
}

.fineprint {
  margin-top: 16px;
  color: #93a4c9;
  font-size: 0.88rem;
}

#start-btn {
  margin-top: 18px;
  border: none;
  border-radius: 999px;
  padding: 13px 22px;
  font-weight: 800;
  font-size: 0.98rem;
  letter-spacing: 0.04em;
  color: #07111e;
  background: linear-gradient(135deg, #f6d773, #7ee4ff);
  cursor: pointer;
  transition: transform 120ms ease, filter 120ms ease;
}

#start-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

#start-btn:active {
  transform: translateY(0);
}

#hud {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 12;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

#enemy-hud {
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 12;
  pointer-events: none;
}

#objective,
#health,
#status,
#enemy-health {
  padding: 9px 11px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  background: rgba(7, 10, 16, 0.58);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.16);
  color: #eef4ff;
  font-weight: 700;
  letter-spacing: 0.02em;
}

#status {
  color: #b9c9e8;
  font-weight: 600;
}

#enemy-health {
  color: #ffd2da;
  border-color: rgba(255, 116, 136, 0.5);
  background: rgba(28, 8, 15, 0.64);
}

#prompt {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  z-index: 12;
  min-width: min(88vw, 420px);
  padding: 10px 14px;
  border: 1px solid rgba(132, 221, 255, 0.34);
  border-radius: 999px;
  background: rgba(6, 10, 18, 0.72);
  color: #f1f7ff;
  text-align: center;
  backdrop-filter: blur(8px);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.3);
}

#crosshair {
  position: fixed;
  left: 50%;
  top: 50%;
  z-index: 11;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.9);
  background: rgba(255, 255, 255, 0.95);
  box-shadow:
    0 0 0 2px rgba(6, 12, 20, 0.65),
    0 0 12px rgba(162, 220, 255, 0.42);
  user-select: none;
  pointer-events: none;
}

@media (max-width: 720px) {
  .panel {
    padding: 20px 18px 16px;
  }

  #hud {
    top: 10px;
    left: 10px;
  }

  #enemy-hud {
    top: 10px;
    right: 10px;
  }

  #objective,
  #health,
  #status,
  #enemy-health {
    font-size: 0.92rem;
  }
}