body {
  font-family: "Inter", "Arial", sans-serif;
  background: radial-gradient(circle at 20% 20%, #1f2940, #0e1220 50%), radial-gradient(circle at 80% 0%, #1e3755, transparent 40%), #0b1020;
  color: #e8ecf5;
  margin: 0;
  min-height: 100vh;
}

h1 {
  color: #f6f7fb;
}

.form-control {
  background-color: #11182b;
  border: 1px solid #2a3b5d;
  color: #e8ecf5;
}

.form-control:focus {
  border-color: #5de0e6;
  box-shadow: 0 0 0 0.2rem rgba(93, 224, 230, 0.3);
  background-color: #0f1728;
  color: #fff;
}

.btn-primary {
  background: linear-gradient(135deg, #5de0e6, #004aad);
  border: none;
  color: #0b1020;
  font-weight: 700;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #72f7fd, #1b62c2);
  color: #0b1020;
}

.btn-reset {
  background: #11182b;
  border: 1px solid #2a3b5d;
  color: #9fd5ff;
}

.btn-reset:hover {
  background: #162038;
  border-color: #36507a;
  color: #c7e6ff;
}

.btn-outline-primary {
  border-color: #5de0e6;
  color: #0b1020;
  background: linear-gradient(135deg, #72f7fd, #1b62c2);
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(114, 247, 253, 0.25);
}

.btn-outline-primary:hover {
  background: linear-gradient(135deg, #88fbff, #2a78d7);
  color: #0b1020;
  box-shadow: 0 10px 24px rgba(114, 247, 253, 0.35);
  transform: translateY(-1px);
}

.app-navbar {
  background: rgba(9, 15, 28, 0.75);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #1e2d4b;
}

.app-shell {
  max-width: 960px;
}

.card {
  background: rgba(13, 19, 35, 0.8);
  border: 1px solid #2a3b5d;
  color: #e8ecf5;
}

.card-title {
  color: #9fd5ff;
}

.table > :not(caption) > * > * {
  background-color: transparent;
  color: #dce6ff;
  border-color: #233555;
}

.cell {
  background: #10192b;
  font-size: 3em;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100px;
  width: 100px;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.1s ease;
  border-radius: 8px;
  color: #f6f7fb;
  border: 2px solid #2f4b7c;
}

.cell:hover {
  background: #1b2a47;
  transform: translateY(-1px);
}

#board {
  max-width: 320px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-gap: 10px;
}

.alert-info {
  font-size: 1.2em;
  background: rgba(93, 224, 230, 0.1);
  border: 1px solid rgba(93, 224, 230, 0.4);
  color: #9ff0f7;
}

#round-info {
  color: #9fd5ff;
}

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