*, *::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";
  margin: 0;
  background: #f1f5f9;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.pricing-tier {
  background: #ffffff;
  padding: 40px;
  border-radius: 24px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.1);
  border: 1px solid #e2e8f0;
}

.tier-header {
  display: flex;
  flex-direction: column;
}

.plan-name {
  color: #3b82f6;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin-bottom: 12px;
}

.tier-header h2 {
  margin: 0 0 12px 0;
  font-size: 3rem;
  color: #0f172a;
  letter-spacing: -1px;
  display: flex;
  align-items: baseline;
}

.tier-header h2 span {
  font-size: 1.1rem;
  color: #64748b;
  font-weight: 500;
  margin-left: 4px;
}

.tier-header p {
  color: #475569;
  margin: 0 0 24px 0;
  line-height: 1.5;
}

.upgrade-btn {
  background: #0f172a;
  color: #ffffff;
  border: none;
  padding: 16px;
  border-radius: 12px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.upgrade-btn:hover {
  background: #1e293b;
  transform: translateY(-2px);
}

.divider {
  width: 100%;
  height: 1px;
  background: #e2e8f0;
  margin: 32px 0;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: #334155;
  font-weight: 500;
  line-height: 1.5;
}

.check-icon {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-shrink: 0;
  margin-top: 2px;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.2);
}