.calc-quiz-classroom-title {
  display: inline-block;
  margin: 0 auto 0.4em;
  padding: 10px 28px;
  background: #2b4a3a;
  border: 6px solid #7a5230;
  border-radius: 6px;
  color: #f5f2e8;
  font-size: 30px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
  letter-spacing: 0.05em;
}

.calc-quiz-board {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 16px 0 28px;
  padding: 40px 24px 46px;
  background:
    radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px) 0 0/22px 22px,
    linear-gradient(155deg, #2f5a44, #1f3f30 60%, #234a37);
  border: 16px solid #7a5230;
  border-radius: 10px;
  box-shadow:
    inset 0 0 0 4px #5c3d22,
    inset 0 0 40px rgba(0, 0, 0, 0.35),
    0 8px 18px rgba(0, 0, 0, 0.35);
  text-align: center;
}

.calc-quiz-board::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: -22px;
  height: 18px;
  background: #6b4527;
  border-radius: 4px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.35);
}

.calc-quiz-board::before {
  content: "";
  position: absolute;
  left: 40px;
  bottom: -14px;
  width: 34px;
  height: 10px;
  background: #f5f2e8;
  border-radius: 3px;
  box-shadow: 46px 0 0 #f5f2e8, 6px 0 0 rgba(255, 203, 61, 0.85);
  z-index: 1;
}

.calc-quiz-board .quiz-question-text {
  font-size: 46px;
  font-weight: bold;
  color: #f5f2e8;
  letter-spacing: 0.08em;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5), 0 0 1px rgba(255, 255, 255, 0.3);
}

#calc-quiz-choices .choice-btn {
  background: linear-gradient(180deg, #8a5a32, #6b4527);
  border: 4px solid #4a2f18;
  color: #fff6e6;
}

#calc-quiz-choices .choice-btn:active {
  background: linear-gradient(180deg, #6b4527, #563619);
}