/**
 * サイト共通ナビ（今週のレース / レース結果 / 予想結果 / 予想方法）
 */
:root {
  --nav-bg-top: #0e5ea9;
  --nav-bg-tabs: #0b4d8a;
  --nav-tab-text: #dbeafe;
  --nav-tab-active-bg: #ffffff;
  --nav-tab-active-text: #0b3f73;
  --nav-border: rgba(255, 255, 255, 0.18);
}

.site-header-bar {
  background: var(--nav-bg-top);
  color: #fff;
  border-bottom: 1px solid var(--nav-border);
  min-height: 44px;
  padding: 0 14px;
  display: flex;
  align-items: center;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-sizing: border-box;
}

.site-tabs {
  background: var(--nav-bg-tabs);
  border-bottom: 2px solid rgba(0, 0, 0, 0.12);
  padding: 10px 12px 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 10px;
  box-sizing: border-box;
}

.site-tab {
  color: var(--nav-tab-text);
  text-decoration: none;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 12px;
  min-height: 40px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.25;
  background: rgba(0, 0, 0, 0.12);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  box-sizing: border-box;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
  transition: background 0.15s ease, color 0.15s ease, transform 0.12s ease;
}

.site-tab:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
}

.site-tab:focus-visible {
  outline: 2px solid #fde68a;
  outline-offset: 2px;
}

.site-tab.active {
  background: var(--nav-tab-active-bg);
  border-color: #fff;
  color: var(--nav-tab-active-text);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

@media (max-width: 520px) {
  .site-tab {
    flex: 1 1 calc(50% - 10px);
    min-width: 0;
    white-space: normal;
    text-align: center;
  }
}