:root {
  --bg-color: var(--tg-theme-bg-color, #f7f9f6);
  --text-color: var(--tg-theme-text-color, #24292e);
  --hint-color: var(--tg-theme-hint-color, #707579);
  --primary-color: #2e7d32;
  --card-bg: var(--tg-theme-secondary-bg-color, #ffffff);
}

body {
  margin: 0;
  padding: 16px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
}

header {
  text-align: center;
  margin-bottom: 20px;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.brand h1 {
  font-size: 1.25rem;
  margin: 0;
  color: var(--primary-color);
}

.tagline {
  font-size: 0.85rem;
  color: var(--hint-color);
  margin-top: 4px;
}

.grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

.card-title {
  font-weight: bold;
  font-size: 0.95rem;
}

.card-price {
  color: var(--primary-color);
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 4px;
}

.btn-buy {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.hidden { display: none; }

.modal-content {
  background: var(--card-bg);
  padding: 20px;
  border-radius: 16px;
  width: 100%;
  max-width: 320px;
  text-align: center;
}

.price-box {
  background: rgba(46, 125, 50, 0.1);
  padding: 10px;
  border-radius: 8px;
  margin: 12px 0;
  color: var(--primary-color);
}

.card-box code {
  display: block;
  font-size: 1.05rem;
  margin-top: 4px;
  letter-spacing: 1px;
}

.warning {
  font-size: 0.75rem;
  color: #d32f2f;
}

.btn {
  background: var(--primary-color);
  color: white;
  border: none;
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  margin-top: 10px;
  cursor: pointer;
}