*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: #f3f4f6;
  margin: 0;
  padding: 40px 20px;
  display: flex;
  justify-content: center;
}

.pricing-section {
  width: 100%;
  max-width: 900px;
}

.billing-toggle {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-bottom: 50px;
}

.label {
  font-size: 1.125rem;
  font-weight: 500;
  color: #374151;
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge {
  background: #dcfce7;
  color: #166534;
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 12px;
  font-weight: 600;
}

.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 32px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #d1d5db;
  transition: .4s;
  border-radius: 32px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 24px;
  width: 24px;
  left: 4px;
  bottom: 4px;
  background-color: #ffffff;
  transition: .4s;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

input:checked + .slider {
  background-color: #3b82f6;
}

input:checked + .slider:before {
  transform: translateX(28px);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.pricing-card {
  background: #ffffff;
  padding: 40px 30px;
  border-radius: 16px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid #e5e7eb;
}

.pricing-card.highlighted {
  border: 2px solid #3b82f6;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  transform: translateY(-10px);
}

.ribbon {
  position: absolute;
  top: 24px;
  right: -32px;
  background: #3b82f6;
  color: #ffffff;
  padding: 6px 40px;
  transform: rotate(45deg);
  font-weight: 600;
  font-size: 0.875rem;
}

.pricing-card h3 {
  margin: 0 0 16px 0;
  color: #111827;
  font-size: 1.5rem;
}

.price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: #111827;
}

.currency {
  font-size: 1.5rem;
  font-weight: 600;
}

.amount {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -1px;
}

.period {
  color: #6b7280;
  font-weight: 500;
  margin-bottom: 24px;
  font-size: 0.95rem;
  min-height: 20px;
}

.features {
  list-style: none;
  padding: 0;
  margin: 0 0 32px 0;
  flex-grow: 1;
  color: #4b5563;
  line-height: 2.5;
}

.plan-btn {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid #3b82f6;
  background: transparent;
  color: #3b82f6;
  transition: all 0.2s;
  font-size: 1rem;
}

.plan-btn:hover {
  background: #eff6ff;
}

.plan-btn.primary {
  background: #3b82f6;
  color: #ffffff;
}

.plan-btn.primary:hover {
  background: #2563eb;
}

const toggle = document.getElementById("billing-switch");
const amounts = document.querySelectorAll(".amount");
const periods = document.querySelectorAll(".period");

toggle.addEventListener("change", (e) => {
  const isAnnual = e.target.checked;
  
  amounts.forEach(amount => {
    amount.textContent = isAnnual 
      ? amount.getAttribute("data-annual") 
      : amount.getAttribute("data-monthly");
  });
  
  periods.forEach(period => {
    period.textContent = isAnnual ? "/mo (billed annually)" : "/mo";
  });
});