/* ── 五维能力雷达图 ── */

.radar-section {
  margin-bottom: 2rem;
}
.radar-tabs {
  display: flex;
  gap: 24px;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-card);
  padding-bottom: 0.5rem;
}
.radar-tab {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: none;
  padding: 4px 0;
  cursor: pointer;
  position: relative;
  transition: color var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}
.radar-tab:hover { opacity: 0.8; }
.radar-tab.active {
  font-weight: 600;
}
.radar-tab.active.english-tab { color: var(--color-english); }
.radar-tab.active.math-tab { color: var(--color-math); }
.radar-tab.active.history-tab { color: var(--color-history); }
.radar-tab::after {
  content: '';
  position: absolute;
  bottom: -0.5rem; left: 0;
  width: 100%; height: 2px;
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}
.radar-tab.active::after { transform: scaleX(1); }
.radar-tab.active.english-tab::after { background: var(--color-english); }
.radar-tab.active.math-tab::after { background: var(--color-math); }
.radar-tab.active.history-tab::after { background: var(--color-history); }

.radar-chart-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-chart);
  padding: 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 360px;
  position: relative;
  transition: background var(--transition-slow), border-color var(--transition-slow);
}
.radar-chart-wrapper svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Tooltip */
.radar-tooltip {
  position: fixed;
  background: var(--bg-card);
  border: 1px solid;
  border-radius: 8px;
  padding: 12px 16px;
  min-width: 140px;
  box-shadow: var(--shadow-tooltip);
  pointer-events: none;
  z-index: 200;
  opacity: 0;
  transition: opacity 150ms ease-out;
  font-size: 0.8125rem;
}
.radar-tooltip.visible { opacity: 1; }
.radar-tooltip .tt-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.radar-tooltip .tt-score {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
}
.radar-tooltip .tt-comment {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-style: italic;
}
.radar-tooltip .tt-arrow {
  position: absolute;
  width: 0; height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 6px solid var(--bg-card);
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
}

/* 空状态 */
.radar-empty {
  text-align: center;
  padding: 2rem;
}
.radar-empty .empty-icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.radar-empty .empty-text { color: var(--text-tertiary); font-size: 0.9375rem; }
.radar-empty .empty-hint { color: var(--text-tertiary); font-size: 0.8125rem; margin-top: 0.5rem; }

/* Skeleton */
.radar-skeleton {
  text-align: center;
  padding: 3rem;
}
.radar-skeleton .pulse-circle {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: #E8E0D5;
  margin: 0 auto 1rem;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}
[data-theme="dark"] .radar-skeleton .pulse-circle {
  background: rgba(255, 255, 255, 0.04);
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}

/* 错误状态 */
.radar-error {
  text-align: center;
  padding: 2rem;
  color: var(--text-tertiary);
}
.radar-error .error-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.radar-error .retry-btn {
  margin-top: 0.75rem;
  color: var(--color-brand);
  background: none;
  border: none;
  font-size: 0.875rem;
  cursor: pointer;
  font-weight: 500;
}
.radar-error .retry-btn:hover { text-decoration: underline; }

@media (max-width: 640px) {
  .radar-chart-wrapper { min-height: 300px; padding: 1rem; }
  .radar-tabs { gap: 16px; }
  .radar-tab { font-size: 0.8125rem; }
}