:root {
  --playfield-max-width: 720px;
}

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

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #0a1a3a;
  color: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

body {
  display: flex;
  justify-content: center;
  align-items: stretch;
  background: linear-gradient(180deg, #0a1a3a 0%, #1a3a8a 100%);
}

#playfield {
  position: relative;
  width: 100%;
  max-width: var(--playfield-max-width);
  height: 100%;
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.04), 0 0 40px rgba(0, 0, 0, 0.4);
}

#game {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: linear-gradient(#7ec8ff, #b9e2ff);
  touch-action: none;
}

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  padding: 24px;
  pointer-events: auto;
}

.screen.hidden { display: none; }

#screen-game { pointer-events: none; }
#screen-game .hud-shields,
#screen-game .hud-zone,
#screen-game .hud-stats { pointer-events: auto; }

.title {
  margin: 0;
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 800;
  text-shadow: 0 4px 0 rgba(0,0,0,0.2);
  background: linear-gradient(180deg, #fff 0%, #ffd24a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.btn-big {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  min-width: 220px;
  min-height: 96px;
  padding: 16px 32px;
  font-size: 28px;
  font-weight: 800;
  color: #0a1a3a;
  background: #ffd24a;
  border: 4px solid #fff;
  border-radius: 28px;
  box-shadow: 0 6px 0 #c79900, 0 12px 24px rgba(0,0,0,0.25);
  cursor: pointer;
  transition: transform 80ms ease, box-shadow 80ms ease;
}

.btn-big:active {
  transform: translateY(4px);
  box-shadow: 0 2px 0 #c79900, 0 6px 12px rgba(0,0,0,0.25);
}

.btn-big:disabled {
  opacity: 0.5;
  cursor: default;
  transform: none;
}

.difficulty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: min(360px, 80%);
  background: rgba(10, 26, 58, 0.45);
  border: 2px solid rgba(255, 255, 255, 0.6);
  border-radius: 20px;
  padding: 14px 18px;
  color: #fff;
}

.difficulty-label {
  font-size: 18px;
  font-weight: 700;
  color: #ffd24a;
}

.difficulty input[type="range"] {
  width: 100%;
  accent-color: #ffd24a;
}

.difficulty-value {
  font-size: 18px;
  font-weight: 700;
}

.btn-mode-link {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 10px 24px;
  background: #1a0410;
  color: #ffd24a;
  border: 3px solid #ffd24a;
  text-decoration: none;
  font-family: "Courier New", monospace;
  letter-spacing: 0.12em;
  box-shadow: 0 4px 0 #5a1010;
  transition: transform 80ms ease;
}

.btn-mode-link:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 #5a1010;
}

.btn-mode-label {
  font-size: 22px;
  font-weight: 800;
  text-shadow: 2px 0 #c43030, -2px 0 #c43030;
}

.btn-mode-sub {
  font-size: 12px;
  color: #ff8a3a;
}

.btn-mode-lecture {
  background: #fff;
  color: #3a7ad6;
  border-color: #3a7ad6;
  box-shadow: 0 4px 0 #2a5aa6;
  font-family: system-ui, sans-serif;
  letter-spacing: 0.06em;
}

.btn-mode-lecture .btn-mode-label {
  text-shadow: none;
}

.btn-mode-lecture .btn-mode-sub {
  color: #5a7a90;
}

.btn-mute {
  position: fixed;
  top: 12px;
  right: 12px;
  width: 64px;
  height: 64px;
  padding: 0;
  border: 3px solid #fff;
  border-radius: 50%;
  background: rgba(10, 26, 58, 0.65);
  color: #fff;
  cursor: pointer;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-mute .icon-mute { display: none; }
.btn-mute.is-muted .icon-sound { display: none; }
.btn-mute.is-muted .icon-mute { display: inline-flex; }

.hud-shields {
  position: absolute;
  top: 16px;
  left: 16px;
  display: flex;
  gap: 6px;
}

.hud-shields .shield {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ff5b6b;
  filter: drop-shadow(0 2px 0 rgba(0,0,0,0.25));
  transition: opacity 200ms ease, transform 200ms ease;
}

.hud-shields .shield.lost {
  opacity: 0.15;
  transform: scale(0.8);
}

.hud-zone {
  position: absolute;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(0,0,0,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.hud-stats {
  position: absolute;
  top: 16px;
  right: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: rgba(0, 0, 0, 0.35);
  border-radius: 12px;
  padding: 8px 12px;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 1px 2px rgba(0,0,0,0.6);
  font-size: 14px;
  min-width: 96px;
}

.hud-stat {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.hud-stat-label {
  font-weight: 700;
  color: #ffd24a;
}

.hud-stat-value {
  color: #fff;
  font-weight: 600;
}

.countdown-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 5;
}

.countdown-overlay.hidden { display: none; }

.countdown-number {
  font-size: clamp(96px, 22vw, 220px);
  font-weight: 900;
  color: #ffd24a;
  text-shadow: 0 0 24px rgba(255,210,74,0.6), 0 6px 0 rgba(0,0,0,0.4);
  font-variant-numeric: tabular-nums;
  animation: countdown-pulse 1s ease-out;
}

.countdown-number.go {
  color: #ff8c2a;
}

@keyframes countdown-pulse {
  0%   { transform: scale(0.4); opacity: 0; }
  20%  { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(1.0); opacity: 1; }
}

.end-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: rgba(10, 26, 58, 0.55);
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-radius: 16px;
  padding: 12px 28px;
  color: #fff;
}

.end-stat-label {
  font-size: 14px;
  font-weight: 600;
  color: #ffd24a;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.end-stat-value {
  font-size: 36px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.victory-title {
  margin: 0;
  font-size: clamp(36px, 8vw, 72px);
  font-weight: 900;
  color: #ffd24a;
  text-shadow: 0 4px 0 rgba(0,0,0,0.3);
}

.soft-end-art,
.victory-art {
  filter: drop-shadow(0 8px 16px rgba(0,0,0,0.35));
}

#screen-victory {
  background: radial-gradient(ellipse at center, #1a3a8a 0%, #0a1a3a 70%);
}

.victory-art .stars {
  animation: twinkle 1.6s ease-in-out infinite alternate;
}

.victory-art .planet {
  transform-origin: 100px 100px;
  animation: orbit-spin 6s linear infinite;
}

@keyframes twinkle {
  from { opacity: 0.4; }
  to { opacity: 1; }
}

@keyframes orbit-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .victory-art .stars,
  .victory-art .planet { animation: none; }
}