:root {
  --bg-color: var(--tg-theme-bg-color, #ffffff);
  --text-color: var(--tg-theme-text-color, #000000);
  --hint-color: var(--tg-theme-hint-color, #999999);
  --link-color: var(--tg-theme-link-color, #2481cc);
  --button-color: var(--tg-theme-button-color, #2481cc);
  --button-text-color: var(--tg-theme-button-text-color, #ffffff);
  --secondary-bg-color: var(--tg-theme-secondary-bg-color, #f0f0f0);
  --section-bg-color: var(--tg-theme-section-bg-color, #ffffff);
  --card-bg: #f8f9fa;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  padding: 16px;
  min-height: 100vh;
}

.page { display: none; }
.page.active { display: block; }

h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.subtitle {
  color: var(--hint-color);
  font-size: 14px;
  margin-bottom: 24px;
}

.hint {
  color: var(--hint-color);
  font-size: 13px;
  text-align: center;
  margin: 16px 0;
}

.section {
  margin-bottom: 24px;
}

/* Loading */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--secondary-bg-color);
  border-top-color: var(--button-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 40px auto 16px;
}

@keyframes spin { to { transform: rotate(360deg); } }

#loading p { text-align: center; color: var(--hint-color); }

/* Channel Header */
#channel-header {
  text-align: center;
  padding: 16px 0;
}

#channel-header h1 {
  font-size: 20px;
  margin-bottom: 4px;
}

#channel-header p {
  color: var(--hint-color);
  font-size: 13px;
  line-height: 1.5;
}

/* Card type buttons */
.card-types {
  display: flex;
  gap: 12px;
}

.card-type-btn {
  flex: 1;
  border: 2px solid var(--secondary-bg-color);
  border-radius: 12px;
  padding: 16px 12px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  background: var(--section-bg-color);
}

.card-type-btn:hover { border-color: var(--button-color); }
.card-type-btn.selected {
  border-color: var(--button-color);
  background: var(--secondary-bg-color);
}

.card-type-icon {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-bottom: 8px;
}

.ct-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 24px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  color: #fff;
}

.ct-humo { background: linear-gradient(135deg, #1a5276, #2e86c1); }
.ct-uzcard { background: linear-gradient(135deg, #1a6b3c, #27ae60); }
.ct-visa { background: linear-gradient(135deg, #1a237e, #3949ab); }
.ct-mastercard { background: linear-gradient(135deg, #e65100, #f57c00); }

.card-type-label {
  font-size: 13px;
  font-weight: 500;
}

/* Card preview */
.card-preview {
  background: linear-gradient(135deg, #1a5276, #2e86c1);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  color: #fff;
  min-height: 120px;
  position: relative;
}

.card-preview.visa-mastercard {
  background: linear-gradient(135deg, #1a237e, #3949ab);
}

.card-preview-type {
  font-size: 12px;
  opacity: 0.8;
  margin-bottom: 16px;
}

.card-preview-number {
  font-size: 18px;
  letter-spacing: 2px;
  font-family: 'Courier New', monospace;
  margin-bottom: 12px;
}

.card-preview-expiry {
  font-size: 13px;
  opacity: 0.8;
}

/* Plans */
.plan-card {
  background: var(--card-bg);
  border: 2px solid transparent;
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}

.plan-card:hover { border-color: var(--button-color); }
.plan-card.selected { border-color: var(--button-color); background: var(--secondary-bg-color); }
.plan-card.popular {
  border-color: #ffc107;
  background: #fffbe6;
}

.plan-card .popular-badge {
  position: absolute;
  top: -8px;
  right: 12px;
  background: #ffc107;
  color: #000;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 8px;
  font-weight: 600;
}

.plan-card .plan-name {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 2px;
}

.plan-card .plan-price {
  font-size: 18px;
  font-weight: 700;
  color: var(--button-color);
  margin-bottom: 2px;
}

.plan-card .plan-duration {
  font-size: 13px;
  color: var(--hint-color);
}

/* Form */
.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--hint-color);
  margin-bottom: 6px;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px;
  border: 2px solid var(--secondary-bg-color);
  border-radius: 10px;
  background: var(--section-bg-color);
  color: var(--text-color);
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus {
  border-color: var(--button-color);
}

/* Buttons */
.btn {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
  margin-top: 12px;
}

.btn:active { opacity: 0.8; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--button-color);
  color: var(--button-text-color);
}

.btn-secondary {
  background: var(--secondary-bg-color);
  color: var(--text-color);
}

/* Error & Success */
.error {
  color: #dc3545;
  font-size: 14px;
  padding: 8px 12px;
  background: #fce4e4;
  border-radius: 8px;
  margin-bottom: 12px;
}

.error.hidden { display: none; }

.success-icon, .error-icon {
  font-size: 48px;
  text-align: center;
  margin: 24px 0 16px;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 16px;
  margin: 16px 0;
}

.card p {
  margin-bottom: 8px;
  font-size: 14px;
  line-height: 1.6;
}

#auto-renew-status {
  font-size: 13px;
  color: var(--hint-color);
}

/* Toggle */
.toggle-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
}

.toggle-label {
  font-size: 14px;
  font-weight: 500;
}

.toggle {
  width: 48px;
  height: 28px;
  background: #ccc;
  border-radius: 14px;
  cursor: pointer;
  position: relative;
  transition: background 0.3s;
}

.toggle.active { background: var(--button-color); }

.toggle::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 24px;
  background: white;
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: transform 0.3s;
}

.toggle.active::after { transform: translateX(20px); }

.hidden { display: none; }

#card-number-error {
  margin-top: 8px;
}

#main-error, #otp-error {
  margin-top: 8px;
}