.calc-form {
  max-width: 400px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-size: 16px;
  color: var(--color-text);
  transition: border-color 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.calc-btn {
  background: var(--color-primary);
  color: white;
  border: none;
  padding: 14px;
  border-radius: 10px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: background 0.2s, transform 0.1s;
}

.calc-btn:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.calc-btn:active {
  transform: translateY(0);
}

/* Result */
.age-result {
  display: none;
  margin-top: 24px;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.age-highlight {
  background: #eef2ff;
  border: 2px solid var(--color-primary);
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  margin-bottom: 16px;
}

.age-highlight .label {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.age-highlight .age {
  font-size: 48px;
  font-weight: 800;
  color: var(--color-primary);
}

.age-highlight .unit {
  font-size: 20px;
  font-weight: 400;
  color: var(--color-text-muted);
}

.age-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.age-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
}

.age-card .value {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
}

.age-card .label {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.age-extras {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.age-extra {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
}

.age-extra .value {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
}

.age-extra .label {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* Birthday easter egg */
.birthday-message {
  text-align: center;
  padding: 16px;
  margin: 16px 0;
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border: 2px solid #f59e0b;
  border-radius: 12px;
  animation: birthdayPop 0.6s ease;
}

.birthday-emoji {
  font-size: 24px;
}

.birthday-text {
  font-size: 20px;
  font-weight: 700;
  color: #b45309;
  margin: 0 8px;
}

@keyframes birthdayPop {
  0% { transform: scale(0.8); opacity: 0; }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); opacity: 1; }
}

@media (max-width: 640px) {
  .age-highlight .age {
    font-size: 40px;
  }
}