:root {
  --color-primary: #2f3e46;
  --color-accent: #52796f;
  --color-bg: #f6f5f3;
  --color-card: #ffffff;
  --color-text: #1b1f22;
  --color-muted: #6b7280;
  --color-danger: #b3261e;
  --color-success: #2f6d3a;
  --radius: 12px;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

.hero {
  text-align: center;
  padding: 48px 20px 32px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 2rem;
}

.hero p {
  margin: 0;
  opacity: 0.9;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 20px;
}

.feedback {
  max-width: 600px;
  margin: 0 auto 24px;
  padding: 14px 18px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  text-align: center;
}

.feedback.error {
  background: #fdecea;
  color: var(--color-danger);
  border: 1px solid #f5c6c3;
}

.feedback.success {
  background: #e9f5eb;
  color: var(--color-success);
  border: 1px solid #bfe3c4;
}

.email-field {
  max-width: 420px;
  margin: 0 auto 32px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.email-field label {
  font-size: 0.9rem;
  color: var(--color-muted);
}

.email-field input {
  padding: 12px 14px;
  border: 1px solid #d8d8d8;
  border-radius: var(--radius);
  font-size: 1rem;
}

.email-field input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.loading {
  text-align: center;
  padding: 40px;
  color: var(--color-muted);
  grid-column: 1 / -1;
}

.plan-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  border: 2px solid transparent;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.plan-card:hover {
  transform: translateY(-4px);
}

.plan-card.selected {
  border-color: var(--color-accent);
}

.plan-card h2 {
  margin: 0 0 4px;
  font-size: 1.3rem;
  color: var(--color-primary);
}

.plan-card .price {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  margin: 8px 0 4px;
}

.plan-card .price small {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-muted);
}

.plan-card .description {
  color: var(--color-muted);
  margin-bottom: 16px;
  min-height: 40px;
}

.plan-card ul {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  flex: 1;
}

.plan-card ul li {
  padding: 6px 0;
  border-bottom: 1px solid #eee;
  font-size: 0.92rem;
}

.plan-card ul li::before {
  content: "✓ ";
  color: var(--color-success);
  font-weight: 700;
}

.subscribe-btn {
  background: var(--color-accent);
  color: #fff;
  border: none;
  padding: 14px 20px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.15s ease;
}

.subscribe-btn:hover {
  background: var(--color-primary);
}

.subscribe-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

footer {
  text-align: center;
  padding: 24px;
  color: var(--color-muted);
  font-size: 0.85rem;
}