/* Invaders-Breakout — clean arcade UI */
:root {
  --bg: #070b14;
  --panel: #0f1628;
  --border: #1e2a44;
  --text: #e8eefc;
  --muted: #8b9bb8;
  --accent: #4fd1c5;
  --accent-2: #f6ad55;
  --danger: #fc8181;
  --laser: #63b3ed;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: radial-gradient(ellipse at 50% 0%, #121a2e 0%, var(--bg) 55%);
  color: var(--text);
  font-family: var(--font);
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

#app {
  max-width: 560px;
  margin: 0 auto;
  padding: 0.75rem 0.75rem 1.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.top-bar {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.logo {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: center;
  text-transform: uppercase;
}

.logo span {
  color: var(--accent);
  margin: 0 0.15em;
}

.hud {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.4rem;
  background: rgba(15, 22, 40, 0.85);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.5rem 0.4rem;
}

.hud-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  min-width: 0;
}

.hud-item .label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.hud-item span:last-child {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
}

#lives {
  color: var(--danger) !important;
  letter-spacing: 0.05em;
  font-size: 0.85rem !important;
}

.stage-wrap {
  position: relative;
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

#game {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
  aspect-ratio: 480 / 640;
  background: #050810;
  border: 2px solid var(--border);
  border-radius: 12px;
  box-shadow:
    0 0 0 1px rgba(79, 209, 197, 0.08),
    0 12px 40px rgba(0, 0, 0, 0.45);
  touch-action: none;
  cursor: none;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(5, 8, 16, 0.72);
  backdrop-filter: blur(4px);
  border-radius: 12px;
  transition: opacity 0.2s ease;
}

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

.panel {
  width: min(100%, 340px);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.35rem 1.25rem 1.2rem;
  text-align: center;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
}

.panel h2 {
  margin: 0 0 0.5rem;
  font-size: 1.35rem;
  color: var(--accent);
}

.panel p {
  margin: 0 0 0.85rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.controls-list {
  margin: 0 0 1.1rem;
  padding: 0;
  list-style: none;
  text-align: left;
  font-size: 0.82rem;
  color: var(--text);
  line-height: 1.55;
}

.controls-list li {
  margin-bottom: 0.35rem;
  padding-left: 0.1rem;
}

kbd {
  display: inline-block;
  padding: 0.1em 0.4em;
  margin: 0 0.1em;
  font-family: var(--mono);
  font-size: 0.78em;
  background: #1a2438;
  border: 1px solid #2d3a55;
  border-radius: 4px;
  color: var(--accent-2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin-top: 0.45rem;
  padding: 0.7rem 1rem;
  border-radius: 8px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.12s ease, border-color 0.12s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn.primary {
  background: linear-gradient(180deg, #5eead4 0%, #2dd4bf 100%);
  color: #06201c;
}

.btn.primary:hover {
  background: linear-gradient(180deg, #7cf0dc 0%, #3de0c8 100%);
}

.btn.ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
  font-weight: 500;
  font-size: 0.85rem;
}

.btn.ghost:hover {
  border-color: var(--muted);
  color: var(--text);
}

.footer {
  text-align: center;
}

.footer p {
  margin: 0;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

@media (min-width: 520px) {
  .logo {
    font-size: 1.3rem;
  }

  .hud-item span:last-child {
    font-size: 1.05rem;
  }
}

@media (max-width: 380px) {
  .hud {
    grid-template-columns: repeat(2, 1fr);
  }
}