/* ===== Tab导航栏样式 ===== */
.tab-nav {
  display: flex;
  gap: 0.25rem;
  margin-bottom: 1.25rem;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 12px;
  padding: 0.3rem;
}

.tab-btn {
  flex: 1;
  padding: 0.65rem 0.5rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: #9a8fc7;
  background: transparent;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
  touch-action: manipulation;
}

.tab-btn:hover {
  color: #c4b5fd;
  background: rgba(124, 58, 237, 0.12);
}

.tab-btn.active {
  color: #fff;
  background: linear-gradient(135deg, #7c3aed, #5b21b6);
  box-shadow: 0 2px 12px rgba(124, 58, 237, 0.35);
}

.tab-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* ===== 子页面切换 ===== */
.page-section {
  display: none;
  animation: page-in 0.25s ease;
}

.page-section.active {
  display: block;
}

@keyframes page-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 子页面头部 ===== */
.upgrade-page-header,
.progress-page-header,
.settings-page-header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.upgrade-page-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: #f87171;
  text-shadow: 0 0 20px rgba(248, 113, 113, 0.3);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.upgrade-page-subtitle {
  font-size: 0.9rem;
  color: #9a8fc7;
}

.progress-page-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: #c9b8ff;
  text-shadow: 0 0 20px rgba(160, 120, 255, 0.3);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.settings-page-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: #c9b8ff;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

/* ===== 设置页内容 ===== */
.settings-page-content {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 320px;
  margin: 0 auto;
}

/* ===== 成就列表样式 ===== */
.achievements-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.achievement-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  background: rgba(0, 0, 0, 0.22);
  border-radius: 10px;
  padding: 0.75rem 0.85rem;
  border-left: 3px solid #7c3aed;
  transition: border-color 0.2s;
}

.achievement-item.completed {
  border-left-color: #34d399;
}

.achievement-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.achievement-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: #e8dfff;
}

.achievement-desc {
  font-size: 0.75rem;
  color: #9a8fc7;
}

.achievement-status {
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.achievement-status.done {
  color: #34d399;
}

.achievement-status.pending {
  color: #7c6fa8;
}

/* ===== 统计详情面板 ===== */
.stats-detail-panel {
  margin-top: 1rem;
}

.stats-detail-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.55rem;
}

.stats-detail-item {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  padding: 0.6rem 0.75rem;
  text-align: center;
}

.stats-detail-item .stat-name {
  display: block;
  font-size: 0.72rem;
  color: #9a8fc7;
  margin-bottom: 0.25rem;
}

.stats-detail-item .stat-value {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: #e8dfff;
  font-variant-numeric: tabular-nums;
}

/* ===== 进度页挑战面板 ===== */
.page-progress .curse-challenges-panel {
  margin-top: 1rem;
}

/* ===== 响应式 ===== */
@media (max-width: 720px) {
  .tab-btn {
    font-size: 0.82rem;
    padding: 0.55rem 0.3rem;
  }

  .stats-detail-list {
    grid-template-columns: repeat(2, 1fr);
  }
}