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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--tg-theme-bg-color, #17212b);
  color: var(--tg-theme-text-color, #ffffff);
  -webkit-tap-highlight-color: transparent;
}

.header {
  padding: 20px 16px 12px;
  background: var(--tg-theme-secondary-bg-color, #232e3c);
  border-radius: 0 0 20px 20px;
  margin-bottom: 8px;
}

.header-title {
  font-size: 22px;
  font-weight: 700;
}

.header-sub {
  font-size: 14px;
  color: var(--tg-theme-hint-color, #8a97a3);
  margin-top: 4px;
}

.tabs {
  display: flex;
  gap: 6px;
  padding: 0 12px;
  margin-bottom: 12px;
}

.tab {
  flex: 1;
  padding: 10px 4px;
  background: var(--tg-theme-secondary-bg-color, #232e3c);
  color: var(--tg-theme-hint-color, #8a97a3);
  border: none;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tab.active {
  background: var(--tg-theme-button-color, #5288c1);
  color: var(--tg-theme-button-text-color, #ffffff);
}

.content {
  padding: 0 12px 24px;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.loading {
  text-align: center;
  padding: 40px 0;
  color: var(--tg-theme-hint-color, #8a97a3);
}

.lesson-card {
  background: var(--tg-theme-secondary-bg-color, #232e3c);
  border-radius: 14px;
  padding: 14px;
  margin-bottom: 10px;
}

.lesson-num {
  display: inline-block;
  background: var(--tg-theme-button-color, #5288c1);
  color: var(--tg-theme-button-text-color, #ffffff);
  border-radius: 8px;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 8px;
}

.lesson-subject {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.3;
}

.lesson-meta {
  font-size: 13px;
  color: var(--tg-theme-hint-color, #8a97a3);
}

.balance-card {
  background: linear-gradient(135deg, #5288c1, #3a6491);
  border-radius: 18px;
  padding: 24px;
  text-align: center;
  margin-bottom: 20px;
}

.balance-label {
  font-size: 13px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 6px;
}

.balance-value {
  font-size: 32px;
  font-weight: 800;
  color: #ffffff;
}

.leaderboard-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 10px;
}

.leaderboard-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--tg-theme-secondary-bg-color, #232e3c);
  border-radius: 12px;
  padding: 12px 14px;
  margin-bottom: 8px;
  font-size: 14px;
}

.leaderboard-rank {
  font-weight: 700;
  margin-right: 10px;
}

.leaderboard-name {
  flex: 1;
}

.leaderboard-score {
  font-weight: 700;
  color: var(--tg-theme-button-color, #5288c1);
}

.search-box {
  display: flex;
  gap: 8px;
}

.search-box input {
  flex: 1;
  background: var(--tg-theme-secondary-bg-color, #232e3c);
  border: none;
  border-radius: 12px;
  padding: 12px 14px;
  color: var(--tg-theme-text-color, #ffffff);
  font-size: 14px;
}

.search-box input::placeholder {
  color: var(--tg-theme-hint-color, #8a97a3);
}

.search-box button {
  background: var(--tg-theme-button-color, #5288c1);
  color: var(--tg-theme-button-text-color, #ffffff);
  border: none;
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 16px;
  cursor: pointer;
}

.result-card {
  background: var(--tg-theme-secondary-bg-color, #232e3c);
  border-radius: 12px;
  padding: 12px 14px;
  margin-top: 10px;
  font-size: 14px;
}

.result-card b {
  color: var(--tg-theme-link-color, #64b5ef);
}

.curator-card {
  margin-top: 20px;
  background: var(--tg-theme-secondary-bg-color, #232e3c);
  border-radius: 12px;
  padding: 14px;
  font-size: 14px;
}

.error-text {
  color: #e57373;
  text-align: center;
  padding: 20px;
}

.fallback-warning {
  background: rgba(255, 193, 7, 0.15);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 12px;
  color: #ffc107;
  margin-bottom: 10px;
}