/* ═══════════════════════════════════════════
   neurun Components — 共享组件样式
   ═══════════════════════════════════════════ */

/* ── App Navigation ── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 0 12px;
}
.app-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .2px;
}
.app-brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 11px;
  background: var(--accent);
  color: #fff;
  font-size: 17px;
  font-weight: 900;
}
.app-nav {
  position: fixed;
  z-index: 50;
  left: 50%;
  bottom: calc(10px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  width: min(calc(100% - 24px), 520px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  padding: 6px;
  border: 1px solid var(--border-subtle);
  border-radius: 22px;
  background: color-mix(in srgb, var(--bg-card) 92%, transparent);
  box-shadow: 0 12px 40px rgba(0, 0, 0, .22);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}
.app-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  min-width: 0;
  min-height: 54px;
  padding: 6px 5px;
  border-radius: 16px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color .2s, background .2s;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.app-nav-item[aria-current="page"] {
  background: var(--accent-glow);
  color: var(--accent);
}
.app-nav-icon {
  width: 21px;
  height: 21px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.app-nav-label {
  font-size: 10px;
  font-weight: 750;
  line-height: 1;
  letter-spacing: .2px;
}

/* ── Theme Bar ── */
.theme-bar {
  display: inline-flex;
  gap: 3px;
  padding: 3px;
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  background: var(--bg-card);
  box-shadow: var(--card-shadow);
}
.theme-btn {
  min-height: 40px;
  border: 1px solid transparent;
  padding: 6px 10px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 650;
  cursor: pointer;
  background: transparent;
  color: var(--text-muted);
  transition: color .2s, background .2s, border-color .2s;
  letter-spacing: .2px;
}
.theme-btn.active {
  background: var(--accent);
  color: #fff;
}

/* ── Buttons (统一) ── */
.btn {
  min-height: 44px;
  padding: 9px 16px;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 650;
  cursor: pointer;
  transition: color .2s, background .2s, border-color .2s, opacity .2s;
  letter-spacing: .3px;
  white-space: nowrap;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.btn:active {
  transform: scale(.97);
  transition: transform 80ms ease-out;
}
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.primary:hover {
  opacity: .85;
}
.btn:disabled {
  opacity: .4;
  cursor: not-allowed;
}
.btn.danger {
  border-color: var(--danger);
  color: var(--danger);
}
.btn.danger:hover {
  background: var(--danger);
  color: #fff;
}

/* ── Spinner ── */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, .3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .6s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}
.spinner-sm {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid rgba(255, 255, 255, .3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .6s linear infinite;
  vertical-align: middle;
  margin-right: 4px;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Card ── */
.card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border-subtle);
}
.card:hover {
  box-shadow: var(--card-shadow-hover);
}

/* ── Heart Rate Zone Strip (签名元素) ── */
.hr-zone-strip {
  display: flex;
  height: 6px;
  border-radius: 3px;
  overflow: hidden;
  background: var(--bg-subtle);
  gap: 0;
}
.hr-zone-strip[data-empty] {
  background: var(--border-subtle);
  opacity: .5;
}
.hr-zone-segment {
  height: 100%;
  transition: flex-grow .4s ease;
}
.hr-zone-segment.zone-1 { background: #94a3b8; }
.hr-zone-segment.zone-2 { background: #60a5fa; }
.hr-zone-segment.zone-3 { background: #34d399; }
.hr-zone-segment.zone-4 { background: #fbbf24; }
.hr-zone-segment.zone-5 { background: #ef4444; }
.hr-zone-label {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}
.hr-zone-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 6px;
  border-radius: 3px;
  background: var(--border-subtle);
  color: var(--text-muted);
  font-size: 10px;
  letter-spacing: .3px;
}

/* ── Section 标题 (左侧色条替代 emoji) ── */
.section-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin: 24px 0 12px;
}
.section-heading::before {
  content: '';
  display: block;
  width: 4px;
  height: 20px;
  border-radius: 2px;
  flex-shrink: 0;
}
.section-heading.sleep::before { background: var(--sleep); }
.section-heading.recovery::before { background: var(--recovery); }
.section-heading.performance::before { background: var(--performance); }
.section-heading.hrv::before { background: var(--hrv); }
.section-heading.warning::before { background: var(--warning); }
.section-heading.danger::before { background: var(--danger); }