:root {
  --bg0: #0b1020;
  --bg1: #0f1a33;
  --ink: #e6eefc;
  --muted: rgba(230, 238, 252, 0.72);
  --muted2: rgba(230, 238, 252, 0.52);
  --line: rgba(230, 238, 252, 0.14);
  --accent: #ffd166;
  --accent2: #06d6a0;
  --danger: #ef476f;
  --btn: rgba(230, 238, 252, 0.12);
  --btnHover: rgba(230, 238, 252, 0.18);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji",
    "Segoe UI Emoji";
  background: radial-gradient(1100px 700px at 18% 12%, #172b57 0%, rgba(23, 43, 87, 0.2) 55%, transparent 70%),
    radial-gradient(900px 600px at 78% 20%, rgba(255, 209, 102, 0.22) 0%, transparent 55%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  overflow: hidden;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 8px;
  left: 8px;
  padding: 10px 12px;
  color: var(--bg0);
  background: var(--accent);
  border-radius: 10px;
  font-weight: 800;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.hidden {
  display: none !important;
}

#app {
  --stage-width: min(1200px, calc(100vw - 40px), calc((100vh - 40px) * 1.6));
  height: 100%;
  display: grid;
  grid-template-rows: 1fr;
  place-items: center;
  padding: 20px;
}

#app:fullscreen {
  width: 100vw;
  height: 100vh;
  background: radial-gradient(900px 620px at 80% 12%, rgba(255, 209, 102, 0.16), transparent 58%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
}

#game {
  width: var(--stage-width);
  height: auto;
  aspect-ratio: 16 / 10;
  border-radius: 18px;
  background: rgba(6, 10, 24, 0.6);
  box-shadow: var(--shadow);
  border: 1px solid rgba(230, 238, 252, 0.1);
  touch-action: none;
  user-select: none;
}

#game:focus-visible,
#game.canvas-focus {
  outline: 3px solid rgba(255, 209, 102, 0.32);
  outline-offset: 2px;
}

#hud {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: grid;
  gap: 10px;
  max-width: var(--stage-width);
  width: var(--stage-width);
  pointer-events: none;
}

.row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.brand .title {
  font-weight: 800;
  letter-spacing: 0.02em;
  font-size: 18px;
}

.brand .subtitle {
  font-size: 13px;
  color: var(--muted);
  margin-top: 2px;
}

.stats {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.stat {
  display: grid;
  grid-template-columns: auto auto;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(10, 16, 32, 0.45);
  backdrop-filter: blur(10px);
}

.stat .k {
  font-size: 11px;
  color: var(--muted2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stat .v {
  font-size: 14px;
  font-weight: 700;
}

.controls {
  pointer-events: auto;
  align-items: center;
}

.group {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--btn);
  color: var(--ink);
  padding: 10px 12px;
  border-radius: 12px;
  font-weight: 700;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

button:hover {
  background: var(--btnHover);
  border-color: rgba(230, 238, 252, 0.22);
}

button:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(255, 209, 102, 0.72);
  outline-offset: 2px;
}

button:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

@keyframes pulseGlow {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 209, 102, 0);
  }
  40% {
    box-shadow: 0 0 0 10px rgba(255, 209, 102, 0.08);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 209, 102, 0);
  }
}

.pulse {
  border-color: rgba(255, 209, 102, 0.42) !important;
  animation: pulseGlow 1.2s ease-in-out infinite;
}

.seed {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(10, 16, 32, 0.45);
  backdrop-filter: blur(10px);
}

.seed span {
  font-size: 11px;
  color: var(--muted2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.seed input {
  width: 220px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--ink);
  font-weight: 700;
}

.hint {
  pointer-events: none;
  font-size: 13px;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px dashed rgba(230, 238, 252, 0.18);
  background: rgba(10, 16, 32, 0.35);
  backdrop-filter: blur(10px);
  min-height: 18px;
  flex: 1;
}

.help {
  pointer-events: none;
  gap: 10px;
  flex-wrap: wrap;
}

.pill {
  font-size: 12px;
  color: var(--muted2);
  border: 1px solid rgba(230, 238, 252, 0.12);
  background: rgba(10, 16, 32, 0.25);
  padding: 8px 10px;
  border-radius: 999px;
}

#modal {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(10px);
  pointer-events: auto;
}

#modal.hidden {
  display: none;
}

.tutorial {
  position: absolute;
  left: 20px;
  bottom: 20px;
  width: min(440px, calc(100vw - 40px));
  border-radius: 18px;
  border: 1px solid rgba(230, 238, 252, 0.16);
  background: rgba(10, 16, 32, 0.92);
  box-shadow: var(--shadow);
  padding: 14px;
  pointer-events: auto;
  backdrop-filter: blur(10px);
}

.tHead {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.tTitle {
  font-weight: 900;
  letter-spacing: 0.02em;
  font-size: 14px;
}

.tStep {
  font-size: 11px;
  color: var(--muted2);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.tBody {
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.45;
  font-size: 13px;
  white-space: pre-wrap;
}

.tActions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 10px;
}

.tutorial button {
  padding: 9px 11px;
}

.card {
  width: min(640px, calc(100vw - 40px));
  border-radius: 18px;
  border: 1px solid rgba(230, 238, 252, 0.16);
  background: rgba(10, 16, 32, 0.92);
  box-shadow: var(--shadow);
  padding: 18px;
}

.mTitle {
  font-weight: 900;
  letter-spacing: 0.02em;
  font-size: 18px;
}

.mBody {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.5;
  font-size: 14px;
  white-space: pre-wrap;
}

.mActions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 14px;
}

@media (max-width: 900px) {
  body {
    min-height: 100%;
    height: auto;
    overflow-x: hidden;
    overflow-y: auto;
  }

  #app {
    --stage-width: min(100%, 960px);
    min-height: 100vh;
    height: auto;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    gap: 12px;
    padding: 14px;
  }

  #hud {
    position: static;
    order: -1;
    width: 100%;
    max-width: 960px;
    transform: none;
    pointer-events: auto;
  }

  #game {
    flex: none;
    width: 100%;
    max-width: 960px;
    border-radius: 14px;
  }

  .row,
  .controls {
    flex-wrap: wrap;
  }

  .controls {
    align-items: stretch;
  }

  .controls .group {
    flex: 1 1 100%;
  }

  .brand {
    flex: 1 1 260px;
  }

  .stats {
    flex: 1 1 320px;
    justify-content: flex-start;
  }

  .tutorial {
    left: 14px;
    right: 14px;
    bottom: 14px;
    width: calc(100vw - 28px);
  }

  .seed input {
    width: 150px;
  }

  .help {
    display: none;
  }
}

@media (max-width: 520px) {
  #app {
    padding: 10px;
  }

  .brand .subtitle {
    max-width: 34ch;
  }

  .stat {
    flex: 1 1 90px;
    justify-content: space-between;
  }

  .group > button {
    flex: 1 1 auto;
  }

  .seed {
    flex: 1 1 100%;
  }

  .seed input {
    width: min(58vw, 260px);
  }
}

@media (pointer: coarse) {
  button,
  .seed {
    min-height: 46px;
  }

  button {
    padding: 11px 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}