.vocab-ooo-screen {
  width: min(1160px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 18px 0 40px;
  box-sizing: border-box;
  color: #17212b;
  font-family: Nunito, Manrope, system-ui, -apple-system, "Segoe UI", sans-serif;
}

.vocab-ooo-hero {
  margin: 12px 0 24px;
  text-align: left;
}

.vocab-ooo-hero h2,
.vocab-ooo-result h2 {
  margin: 0;
  font-size: clamp(34px, 4vw, 54px);
  line-height: 1.04;
  font-weight: 950;
  letter-spacing: -0.01em;
}

.vocab-ooo-hero p,
.vocab-ooo-result p {
  margin: 8px 0 0;
  color: #667584;
  font-size: clamp(16px, 1.7vw, 21px);
  font-weight: 850;
}

.vocab-ooo-board {
  width: 100%;
}

.vocab-ooo-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 28px);
}

.vocab-ooo-card {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: clamp(190px, 22vw, 285px);
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid rgba(0, 186, 255, 0.08);
  border-radius: clamp(28px, 3vw, 38px);
  background:
    radial-gradient(circle at 24% 18%, rgba(0, 186, 255, 0.12), transparent 34%),
    linear-gradient(145deg, #ffffff 0%, #f8fbff 100%);
  box-shadow:
    0 26px 60px rgba(20, 40, 60, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.92);
  color: #17212b;
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 950;
  line-height: 1.08;
  text-align: center;
  cursor: pointer;
  overflow: hidden;
  transform: translateZ(0);
  transition:
    transform 190ms ease,
    box-shadow 190ms ease,
    border-color 190ms ease,
    background 190ms ease;
}

.vocab-ooo-card::after {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: inherit;
  background: radial-gradient(circle at 50% 120%, rgba(0, 186, 255, 0.18), transparent 42%);
  opacity: 0;
  transition: opacity 190ms ease;
  pointer-events: none;
}

.vocab-ooo-card span {
  position: relative;
  z-index: 1;
}

.vocab-ooo-card:hover:not(:disabled) {
  transform: translateY(-7px) scale(1.01);
  border-color: rgba(0, 186, 255, 0.28);
  box-shadow:
    0 34px 78px rgba(0, 186, 255, 0.18),
    0 18px 34px rgba(20, 40, 60, 0.11);
}

.vocab-ooo-card:hover:not(:disabled)::after {
  opacity: 1;
}

.vocab-ooo-card:active:not(:disabled) {
  transform: translateY(-1px) scale(0.985);
}

.vocab-ooo-card:disabled {
  cursor: default;
}

.vocab-ooo-card.is-correct {
  border-color: rgba(34, 197, 94, 0.40);
  background:
    radial-gradient(circle at 50% 45%, rgba(34, 197, 94, 0.22), transparent 38%),
    #ffffff;
  box-shadow:
    0 30px 70px rgba(34, 197, 94, 0.28),
    inset 0 0 0 2px rgba(34, 197, 94, 0.18);
  animation: vocabCorrectPulse 760ms ease;
}

.vocab-ooo-card.is-wrong {
  border-color: rgba(239, 68, 68, 0.32);
  background:
    radial-gradient(circle at 50% 45%, rgba(239, 68, 68, 0.18), transparent 40%),
    #ffffff;
  box-shadow:
    0 26px 60px rgba(239, 68, 68, 0.22),
    inset 0 0 0 2px rgba(239, 68, 68, 0.14);
  animation: vocabWrongShake 320ms ease;
}

.vocab-ooo-feedback,
.vocab-ooo-empty,
.vocab-ooo-result {
  margin-top: 22px;
  padding: 22px;
  border: 1px solid rgba(20, 40, 60, 0.05);
  border-radius: 28px;
  background: #ffffff;
  box-shadow: 0 18px 44px rgba(20, 40, 60, 0.09);
}

.vocab-ooo-feedback {
  background:
    radial-gradient(circle at 12% 0%, rgba(0, 186, 255, 0.14), transparent 34%),
    #ffffff;
}

.vocab-ooo-feedback strong,
.vocab-ooo-result strong {
  display: block;
  font-size: 26px;
  font-weight: 950;
}

.vocab-ooo-feedback p {
  margin: 8px 0 0;
  color: #667584;
  font-size: 16px;
  font-weight: 800;
}

.vocab-ooo-next,
.vocab-ooo-back {
  min-height: 50px;
  padding: 0 20px;
  border: 0;
  border-radius: 18px;
  font-size: 15px;
  font-weight: 950;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.vocab-ooo-next {
  margin-top: 16px;
  background: #00baff;
  color: #ffffff;
  box-shadow: 0 14px 30px rgba(0, 186, 255, 0.24);
}

.vocab-ooo-back {
  background: #ffffff;
  color: #17212b;
  box-shadow: 0 10px 26px rgba(20, 40, 60, 0.08);
}

.vocab-ooo-back--floating {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  margin: 0;
  padding: 0 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  color: #2d3a45;
  box-shadow: 0 12px 28px rgba(20, 40, 60, 0.08);
  backdrop-filter: blur(10px);
}

.vocab-ooo-next:hover,
.vocab-ooo-back:hover {
  transform: translateY(-2px);
}

.vocab-ooo-result {
  text-align: center;
}

.vocab-ooo-result .vocab-ooo-back {
  margin-left: 10px;
}

@keyframes vocabWrongShake {
  0%, 100% { transform: translateX(0); }
  24% { transform: translateX(-7px) rotate(-0.5deg); }
  52% { transform: translateX(7px) rotate(0.5deg); }
  78% { transform: translateX(-3px); }
}

@keyframes vocabCorrectPulse {
  0% { transform: scale(1); }
  42% { transform: scale(1.035); }
  100% { transform: scale(1); }
}

@media (max-width: 720px) {
  .vocab-ooo-screen {
    width: min(100%, calc(100vw - 24px));
    padding: 12px 0 32px;
  }

  .vocab-ooo-hero {
    margin-bottom: 18px;
  }

  .vocab-ooo-grid {
    gap: 13px;
  }

  .vocab-ooo-card {
    min-height: clamp(154px, 38vw, 190px);
    padding: 18px;
    border-radius: 28px;
    font-size: clamp(22px, 7vw, 31px);
  }
}

@media (max-width: 380px) {
  .vocab-ooo-grid {
    gap: 10px;
  }

  .vocab-ooo-card {
    min-height: 138px;
    border-radius: 24px;
    font-size: 20px;
  }
}