:root {
  --bg: #ffffff;
  --fg: #0a0a0a;
  --mid: #8c8c8c;
  --soft: #d6d6d6;
  --line: #e6e6e6;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0a0a;
    --fg: #f2f2f2;
    --mid: #7a7a7a;
    --soft: #333333;
    --line: #1f1f1f;
  }
}

:root[data-theme="dark"] {
  --bg: #0a0a0a;
  --fg: #f2f2f2;
  --mid: #7a7a7a;
  --soft: #333333;
  --line: #1f1f1f;
}

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

html, body {
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  transition: background 0.4s ease, color 0.4s ease;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.wrap {
  width: min(100%, 760px, calc((100dvh - 200px) * 1.6));
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(14px, 2.5vw, 24px);
}

h1 {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: clamp(2.6rem, 9vw, 4.8rem);
  letter-spacing: 0.32em;
  margin-right: -0.32em;
  line-height: 1;
}

.hud {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mid);
  font-variant-numeric: tabular-nums;
}

.hud #score {
  color: var(--fg);
  font-weight: 500;
}

.lives {
  display: flex;
  gap: 6px;
}

.lives i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--fg);
  transition: background 0.3s ease;
}

.lives i.off {
  background: var(--soft);
}

.stage {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  transition: border-color 0.4s ease;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: none;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: opacity 0.3s ease;
}

.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.title {
  font-family: 'Syne', sans-serif;
  font-weight: 600;
  font-size: clamp(1.2rem, 4vw, 1.8rem);
  letter-spacing: 0.3em;
  margin-right: -0.3em;
  text-transform: uppercase;
}

.sub {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mid);
  font-variant-numeric: tabular-nums;
}

.btn {
  margin-top: 6px;
  padding: 14px 40px;
  border: 1px solid var(--fg);
  background: transparent;
  color: var(--fg);
  font-family: inherit;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.btn:hover,
.btn:focus-visible {
  background: var(--fg);
  color: var(--bg);
  outline: none;
}

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--fg);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.4s ease, color 0.4s ease;
  z-index: 10;
}

.theme-toggle:hover {
  border-color: var(--fg);
}

.theme-toggle svg {
  grid-area: 1 / 1;
  transition: opacity 0.3s ease, transform 0.4s ease;
}

.icon-sun { opacity: 0; transform: rotate(-90deg) scale(0.6); }
.icon-moon { opacity: 1; }

:root[data-theme="dark"] .icon-sun { opacity: 1; transform: none; }
:root[data-theme="dark"] .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.6); }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { opacity: 1; transform: none; }
  :root:not([data-theme="light"]) .icon-moon { opacity: 0; transform: rotate(90deg) scale(0.6); }
}