:root {
  --bg-deep: #030812;
  --blue-500: #2f83ff;
  --cyan: #48d6ff;
  --mint: #2df5c8;
}

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

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg-deep);
  color: #eaf3ff;
}

button,
select {
  font: inherit;
}

button {
  border: 0;
}

#app {
  position: fixed;
  inset: 0;
  overflow: hidden;
  background:
    radial-gradient(900px 520px at 16% 14%, rgba(47, 131, 255, 0.22), transparent 58%),
    radial-gradient(900px 520px at 82% 16%, rgba(45, 245, 200, 0.11), transparent 62%),
    linear-gradient(180deg, #09192e 0%, #030812 100%);
}

.noise,
.vignette,
.scanline {
  pointer-events: none;
  position: fixed;
  inset: 0;
}

.noise {
  z-index: 1;
  opacity: 0.06;
  mix-blend-mode: soft-light;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 220 220' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.75'/%3E%3C/svg%3E");
}

.vignette {
  z-index: 2;
  background:
    radial-gradient(circle at 50% 45%, transparent 0%, transparent 48%, rgba(0, 0, 0, 0.22) 72%, rgba(0, 0, 0, 0.78) 100%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.08), rgba(0, 0, 0, 0.42));
}

.scanline {
  z-index: 3;
  opacity: 0.055;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.06),
    rgba(255, 255, 255, 0.06) 1px,
    transparent 1px,
    transparent 4px
  );
}

.launcher {
  position: fixed;
  inset: 0;
  z-index: 4;
  display: grid;
  place-items: center;
  padding: 20px;
}

.launcher.hidden {
  display: none;
}

.launcher-card {
  width: min(420px, 100%);
  border: 1px solid rgba(72, 214, 255, 0.18);
  background: rgba(5, 14, 28, 0.82);
  border-radius: 24px;
  padding: 28px 24px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  text-align: center;
  backdrop-filter: blur(12px);
}

.launcher-kicker {
  color: #8fdcff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.launcher-card h1 {
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1;
  margin-bottom: 12px;
}

.launcher-copy {
  color: #bdd0e6;
  line-height: 1.6;
  margin-bottom: 18px;
}

.launcher-btn {
  min-width: 170px;
}

.game-modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.64);
  z-index: 9999;
  padding: 18px;
  backdrop-filter: blur(12px);
}

.game-box {
  width: 340px;
  max-width: 100%;
  background: #0b1730;
  border-radius: 20px;
  padding: 20px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
}

.game-title {
  text-align: center;
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.close-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #ffffff;
  font-size: 18px;
  font-weight: bold;
}

.game-hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  color: #cbd5e1;
  font-size: 13px;
  gap: 12px;
}

.select {
  background: #1e293b;
  color: white;
  border-radius: 8px;
  padding: 5px 8px;
  border: none;
  outline: none;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  aspect-ratio: 1;
}

.cell {
  aspect-ratio: 1;
  border-radius: 14px;
  background: #14213d;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  font-weight: 900;
  cursor: pointer;
  user-select: none;
  transition: transform 0.16s ease, background 0.16s ease;
}

.cell:hover {
  transform: translateY(-2px);
  background: #18294b;
}

.cell.x {
  color: #38bdf8;
}

.cell.o {
  color: #22c55e;
}

.bottom-controls {
  display: flex;
  justify-content: center;
  margin-top: 14px;
}

.btn {
  padding: 10px 20px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  color: white;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}

.btn:hover,
.close-btn:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.1);
}

#winPopup {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.85);
  border-radius: 20px;
  font-size: 26px;
  font-weight: 800;
  color: #ffffff;
  text-align: center;
  padding: 14px;
}

@media (max-width: 520px) {
  .launcher-card {
    padding: 24px 18px;
  }

  .game-box {
    padding: 18px;
  }
}