:root {
  --tg-theme-bg-color: #ffffff;
  --tg-theme-text-color: #000000;
  --tg-theme-hint-color: #999999;
  --tg-theme-link-color: #2481cc;
  --tg-theme-button-color: #2481cc;
  --tg-theme-button-text-color: #ffffff;
  --tg-theme-secondary-bg-color: #f0f0f0;
  
  --primary-color: var(--tg-theme-button-color, #2481cc);
  --primary-text-color: var(--tg-theme-button-text-color, #ffffff);
  --bg-color: var(--tg-theme-bg-color, #ffffff);
  --text-color: var(--tg-theme-text-color, #000000);
  --hint-color: var(--tg-theme-hint-color, #999999);
  --secondary-bg: var(--tg-theme-secondary-bg-color, #f0f0f0);
  
  --success-color: #4caf50;
  --warning-color: #ff9800;
  --danger-color: #f44336;
  --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

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

.container {
  max-width: 480px;
  margin: 0 auto;
}

/* Header */
.header {
  background: var(--bg-color);
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: var(--card-shadow);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logout-btn {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  padding: 4px;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.logout-btn:hover {
  opacity: 1;
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-color), #64b5f6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 600;
  color: #ffffff;
  text-transform: uppercase;
}

.user-details {
  flex: 1;
}

.username {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-color);
}

.user-id {
  font-size: 13px;
  color: var(--hint-color);
}

/* Cards */
.card {
  background: var(--bg-color);
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: var(--card-shadow);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.card-icon {
  font-size: 20px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-color);
}

.card-content {
  color: var(--text-color);
}

/* Balance Card */
.balance-amount {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary-color);
}

.balance-days {
  font-size: 14px;
  color: var(--hint-color);
  margin-top: 4px;
}

/* Status Card */
.status-value {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.status-value.active {
  color: var(--success-color);
}

.status-value.inactive {
  color: var(--hint-color);
}

.status-value.expired {
  color: var(--danger-color);
}

.tariff-info {
  font-size: 14px;
  color: var(--hint-color);
}

/* Кнопка продления */
.btn-extend {
  background: var(--warning-color);
  color: #ffffff;
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 12px;
  width: 100%;
  transition: opacity 0.2s, transform 0.1s;
}

.btn-extend:active {
  opacity: 0.8;
  transform: scale(0.98);
}

/* Actions Section */
.actions-section {
  margin-bottom: 16px;
}

.section-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 12px;
  padding-left: 4px;
}

.actions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.action-btn {
  background: var(--bg-color);
  border: none;
  border-radius: 12px;
  padding: 16px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  box-shadow: var(--card-shadow);
}

.action-btn:active {
  transform: scale(0.95);
}

.action-icon {
  font-size: 28px;
}

.action-label {
  font-size: 12px;
  color: var(--text-color);
  font-weight: 500;
}

/* Buttons */
.btn-primary {
  background: var(--primary-color);
  color: var(--primary-text-color);
  border: none;
  border-radius: 12px;
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: opacity 0.2s;
}

.btn-primary:active {
  opacity: 0.8;
}

.btn-secondary {
  background: var(--secondary-bg);
  color: var(--text-color);
  border: none;
  border-radius: 12px;
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: opacity 0.2s;
}

.btn-secondary:active {
  opacity: 0.8;
}

/* Devices List */
.devices-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.device-item {
  background: var(--secondary-bg);
  border-radius: 12px;
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.device-info {
  flex: 1;
  min-width: 0;
}

.device-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.device-server {
  font-size: 12px;
  color: var(--hint-color);
  margin-top: 2px;
}

.device-actions {
  display: flex;
  gap: 8px;
}

.device-action-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: none;
  background: var(--bg-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: background 0.2s;
}

.device-action-btn:active {
  background: var(--primary-color);
}

/* Servers List */
.servers-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.server-item {
  background: var(--secondary-bg);
  border: none;
  border-radius: 12px;
  padding: 16px;
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  display: flex;
  align-items: center;
  gap: 12px;
}

.server-item:active {
  background: var(--primary-color);
  transform: scale(0.98);
}

.server-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-color);
  flex: 1;
}

/* Tariffs List */
.tariffs-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tariff-item {
  background: var(--secondary-bg);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 2px solid transparent;
  transition: border-color 0.2s;
}

.tariff-item:hover {
  border-color: var(--primary-color);
}

.tariff-details {
  flex: 1;
}

.tariff-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-color);
  text-transform: uppercase;
}

.tariff-description {
  font-size: 13px;
  color: var(--hint-color);
  margin-top: 4px;
}

.tariff-price {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-color);
}

.tariff-buy-btn {
  background: var(--primary-color);
  color: var(--primary-text-color);
  border: none;
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}

.tariff-buy-btn:active {
  opacity: 0.8;
}

/* Help Section */
.help-text {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-color);
  margin-bottom: 16px;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
}

.modal-content {
  background: var(--bg-color);
  border-radius: 16px;
  padding: 24px;
  width: 100%;
  max-width: 320px;
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 16px;
  text-align: center;
}

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

.input-field:focus {
  border-color: var(--primary-color);
}

.modal-actions {
  display: flex;
  gap: 12px;
}

.modal-actions .btn-secondary,
.modal-actions .btn-primary {
  flex: 1;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--secondary-bg);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Toast Notification */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(-100px);
  background: var(--text-color);
  color: var(--bg-color);
  padding: 12px 24px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  transition: transform 0.3s, opacity 0.3s;
  z-index: 1001;
  max-width: 80%;
  text-align: center;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.success {
  background: var(--success-color);
  color: #ffffff;
}

.toast.error {
  background: var(--danger-color);
  color: #ffffff;
}

/* Responsive */
@media (max-width: 360px) {
  .actions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .balance-amount {
    font-size: 28px;
  }
}