/*  modern-header.css — Phase3 首屏导航壳（已抽离 Command Palette）
 * 源归档：archive/header-css-phase3-sources/modern-header.css
 * 生成：scripts/split-header-cmd-css.mjs（2026-07-24）
 * 重生成：node scripts/split-header-cmd-css.mjs
 * 暗黑双分支 / 833·834 断点保持源语义；禁止手改 .min.*
  *//* ============================================================
   全站响应式现代化顶部菜单（策略 A：单模板 Media Queries）
   断点：≥834 横排菜单（iPad Pro 及以上）/ ≤833 隐藏横排（iPad Air 等）/ ≤480 小屏
   ============================================================ */

/* body 顶距与 fixed header 高度同步（覆盖 app.core 旧 md-head 占位） */
:root {
  --mh-header-h: 136px;
}

body {
  padding-top: var(--mh-header-h);
}

@media (max-width: 833px) {
  body {
    padding-top: calc(env(safe-area-inset-top, 0px) + var(--mh-header-h));
  }
}

.modern-header {
  --mh-header-h: 136px;
  --mh-pill-max-w: 1800px;
  --mh-pill-radius: 75px;
  --mh-pill-mt: 22px;
  --mh-bg: var(--dm-glass);
  --mh-bg-scrolled: var(--dm-glass-scrolled);
  --mh-pill-bg: var(--dm-glass-pill);
  --mh-border: var(--dm-border);
  --mh-pill-border: var(--dm-border);
  --mh-shadow: var(--dm-shadow-sm);
  --mh-shadow-pill: var(--dm-shadow-md);
  --mh-shadow-heavy: var(--dm-shadow-lg);
  --mh-text: var(--dm-text);
  --mh-text-muted: var(--dm-text-secondary);
  --mh-text-soft: var(--dm-text-secondary);
  --mh-accent: var(--husir-coral, var(--dm-accent, #ff6b6b));
  --mh-accent-glow: var(--husir-coral-glow, var(--dm-accent-glow, rgba(255, 107, 107, 0.15)));
  --mh-accent-strong: var(--husir-coral-strong, var(--dm-accent-strong, rgba(255, 107, 107, 0.18)));
  --mh-hover: var(--dm-bg-hover);
  --mh-mega-bg: var(--dm-overlay);
  --mh-mega-border: var(--dm-border);
  --mh-mega-shadow: var(--dm-shadow-md);
  --mh-command-bg: var(--dm-overlay);
  --mh-command-backdrop: var(--dm-backdrop);
  --mh-command-border: var(--dm-border);
  --mh-command-shadow: var(--dm-shadow-lg);
  /* 底部分割线与芯片背景 */
  --mh-divider: var(--dm-border);
  --mh-chip-bg: var(--dm-glass-pill);
  --mh-pill-border-active: var(--husir-coral-soft, var(--dm-accent-soft, rgba(255, 107, 107, 0.12)));
  --mh-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --mh-ease-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --mh-ease-spring: cubic-bezier(0.25, 1, 0.5, 1);
  --mh-ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--mh-header-h);
  z-index: var(--dm-z-header, 10020);
  overflow: visible;
  color: var(--mh-text);
  background: var(--mh-bg);
  border-bottom: none;
  box-shadow: var(--mh-shadow);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  transition:
    width 0.6s var(--mh-ease-spring),
    max-width 0.6s var(--mh-ease-spring),
    background 0.45s var(--mh-ease-smooth),
    border-radius 0.6s var(--mh-ease-spring),
    margin-top 0.6s var(--mh-ease-spring),
    box-shadow 0.45s var(--mh-ease-smooth);
}

.modern-header::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(90deg, transparent 0%, var(--mh-divider) 20%, var(--mh-divider) 50%, var(--mh-divider) 80%, transparent 100%);
}

/* 不用 transform 居中，避免子元素 position:fixed 相对顶栏错位（内页 Mega / 进度条） */
.modern-header.is-compact {
  left: max(5%, calc((100% - min(90%, var(--mh-pill-max-w))) / 2));
  width: min(90%, var(--mh-pill-max-w));
  max-width: var(--mh-pill-max-w);
  margin-top: var(--mh-pill-mt);
  border: 1px solid var(--mh-pill-border);
  border-radius: var(--mh-pill-radius);
  background: var(--mh-pill-bg);
  box-shadow: var(--mh-shadow-pill);
  transform: none;
  -webkit-backdrop-filter: blur(24px);
  backdrop-filter: blur(24px);
}

.modern-header.is-compact.is-scrolled {
  background: var(--mh-bg-scrolled);
  border-color: var(--mh-pill-border-active);
  box-shadow: var(--mh-shadow-heavy);
}

.modern-header.is-scrolled {
  background: var(--mh-bg-scrolled);
}

.mh-scroll-progress {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 70px;
  z-index: 1;
  width: 0;
  height: 4px;
  border-radius: 0;
  background: var(--mh-accent);
  box-shadow: none;
  animation: none;
  transform-origin: left;
  transform: scaleX(0);
  pointer-events: none;
  transition: transform 0.1s linear;
}

.modern-header.is-compact .mh-scroll-progress {
  right: var(--mh-pill-radius);
  left: var(--mh-pill-radius);
}

.mh-scroll-progress--p0 { transform: scaleX(0); }
.mh-scroll-progress--p5 { transform: scaleX(0.05); }
.mh-scroll-progress--p10 { transform: scaleX(0.1); }
.mh-scroll-progress--p15 { transform: scaleX(0.15); }
.mh-scroll-progress--p20 { transform: scaleX(0.2); }
.mh-scroll-progress--p25 { transform: scaleX(0.25); }
.mh-scroll-progress--p30 { transform: scaleX(0.3); }
.mh-scroll-progress--p35 { transform: scaleX(0.35); }
.mh-scroll-progress--p40 { transform: scaleX(0.4); }
.mh-scroll-progress--p45 { transform: scaleX(0.45); }
.mh-scroll-progress--p50 { transform: scaleX(0.5); }
.mh-scroll-progress--p55 { transform: scaleX(0.55); }
.mh-scroll-progress--p60 { transform: scaleX(0.6); }
.mh-scroll-progress--p65 { transform: scaleX(0.65); }
.mh-scroll-progress--p70 { transform: scaleX(0.7); }
.mh-scroll-progress--p75 { transform: scaleX(0.75); }
.mh-scroll-progress--p80 { transform: scaleX(0.8); }
.mh-scroll-progress--p85 { transform: scaleX(0.85); }
.mh-scroll-progress--p90 { transform: scaleX(0.9); }
.mh-scroll-progress--p95 { transform: scaleX(0.95); }
.mh-scroll-progress--p100 { transform: scaleX(1); }

.mh-header-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: clamp(14px, 2.2vw, 42px);
  height: 100%;
  padding: 0 48px;
  overflow: visible;
  min-width: 0;
}

.modern-header.is-compact .mh-header-container {
  padding: 0 42px;
}

.mh-header-logo {
  z-index: 1;
  display: flex;
  flex: 0 1 clamp(120px, 14.3vw, 218px);
  align-items: center;
  min-width: clamp(107px, 10.4vw, 161px);
  max-width: clamp(166px, 15.6vw, 234px);
}

.mh-logo-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 100%;
  transition: opacity 0.25s var(--mh-ease-smooth), transform 0.3s var(--mh-ease-spring);
}

.mh-logo-img {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: calc(var(--mh-header-h) - 24px);
  aspect-ratio: auto;
  object-fit: contain;
}

.mh-header-nav {
  display: flex;
  flex: 1 1 auto;
  justify-content: center;
  min-width: 0;
  margin: 0;
}

.mh-nav-menu {
  position: relative;
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 3px;
  max-width: 100%;
  padding: 6px;
  margin: 0;
  overflow-x: auto;
  overflow-y: hidden;
  list-style: none;
  border-radius: 54px;
  background: rgba(0, 0, 0, 0.02);
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.03);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.mh-nav-menu::-webkit-scrollbar {
  display: none;
}

.mh-nav-item {
  position: relative;
  z-index: 1;
}

.mh-nav-item.has-mega {
  padding-bottom: 30px;
  margin-bottom: -30px;
}

.mh-nav-link {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 60px;
  padding: 15px 23px;
  color: var(--mh-text);
  font-size: 23px;
  font-weight: 520;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  border-radius: 48px;
  transition:
    color 0.25s var(--mh-ease-smooth),
    background 0.25s var(--mh-ease-smooth),
    transform 0.3s var(--mh-ease-spring);
}

.mh-nav-link:hover,
.mh-nav-link.on,
.mh-nav-link.active,
.mh-nav-item.on > .mh-nav-link,
.mh-nav-item.active > .mh-nav-link {
  color: var(--mh-accent);
}

@media (hover: hover) {
  .mh-nav-link:hover {
    transform: scale(1.03);
  }

  .mh-nav-item:hover .mh-chevron {
    opacity: 1;
    transform: rotate(180deg);
  }

  .mh-action-btn:hover {
    color: var(--mh-accent);
    background: var(--mh-hover);
    transform: scale(1.04);
  }

  .mh-logo-link:hover {
    opacity: 0.82;
    transform: scale(0.97);
  }
}

.mh-nav-link.on,
.mh-nav-link.active,
.mh-nav-item.on > .mh-nav-link,
.mh-nav-item.active > .mh-nav-link {
  font-weight: 600;
}

.mh-nav-text {
  display: block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mh-chevron {
  flex: 0 0 auto;
  opacity: 0.5;
  transition: transform 0.3s var(--mh-ease-spring), opacity 0.3s var(--mh-ease-smooth);
}

.mh-mega-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  z-index: var(--dm-z-dropdown, 10030);
  width: 540px;
  max-width: min(540px, calc(100vw - 72px));
  pointer-events: none;
  visibility: hidden;
  opacity: 0;
  transform: translateX(-50%) translateY(12px);
  transition:
    opacity 0.35s var(--mh-ease-out),
    transform 0.35s var(--mh-ease-out),
    visibility 0.35s;
}

.mh-nav-item:hover .mh-mega-menu,
.mh-nav-item:focus-within .mh-mega-menu {
  pointer-events: auto;
  visibility: visible;
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* 桌面：禁止仅靠 absolute(top:100%) 显示，避免同栏目页下拉贴导航、被底边进度条横切 */
@media (min-width: 834px) {
  .mh-nav-item:hover .mh-mega-menu:not(.is-mega-placed),
  .mh-nav-item:focus-within .mh-mega-menu:not(.is-mega-placed) {
    pointer-events: none;
    visibility: hidden;
    opacity: 0;
    transform: translateX(-50%) translateY(12px);
  }

  /* 特异性提升：与隐藏规则同级(0-4-0)，靠后声明胜出 */
  .mh-nav-item:hover .mh-mega-menu.is-mega-placed,
  .mh-nav-item:focus-within .mh-mega-menu.is-mega-placed {
    pointer-events: auto;
    visibility: visible;
    opacity: 1;
    transform: none;
  }
}

.mh-mega-inner {
  position: relative;
  padding: 12px;
  overflow: hidden;
  border: 1px solid var(--mh-mega-border);
  border-radius: 30px;
  background: var(--mh-mega-bg);
  box-shadow: var(--mh-mega-shadow);
  -webkit-backdrop-filter: blur(40px);
  backdrop-filter: blur(40px);
}

/* 紧贴进度条时移除顶部内边距 */
.mh-mega-menu.is-mega-placed .mh-mega-inner {
  padding-top: 0;
}

.mh-mega-inner::after {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 220px;
  height: 220px;
  pointer-events: none;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 90, 95, 0.06) 0%, transparent 70%);
}

.mh-mega-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
}

.mh-mega-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  min-width: 0;
  padding: 14px 16px;
  color: inherit;
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 21px;
  opacity: 0;
  transform: translateY(12px);
  transition:
    background 0.25s var(--mh-ease-smooth),
    transform 0.35s var(--mh-ease-out),
    border-color 0.25s var(--mh-ease-smooth),
    box-shadow 0.25s var(--mh-ease-smooth),
    opacity 0.35s var(--mh-ease-out);
}

.mh-nav-item:hover .mh-mega-card,
.mh-nav-item:focus-within .mh-mega-card {
  opacity: 1;
  transform: translateY(0);
}

.mh-nav-item:hover .mh-mega-card:nth-child(1),
.mh-nav-item:focus-within .mh-mega-card:nth-child(1) { transition-delay: 0.06s; }
.mh-nav-item:hover .mh-mega-card:nth-child(2),
.mh-nav-item:focus-within .mh-mega-card:nth-child(2) { transition-delay: 0.1s; }
.mh-nav-item:hover .mh-mega-card:nth-child(3),
.mh-nav-item:focus-within .mh-mega-card:nth-child(3) { transition-delay: 0.14s; }
.mh-nav-item:hover .mh-mega-card:nth-child(4),
.mh-nav-item:focus-within .mh-mega-card:nth-child(4) { transition-delay: 0.18s; }
.mh-nav-item:hover .mh-mega-card:nth-child(5),
.mh-nav-item:focus-within .mh-mega-card:nth-child(5) { transition-delay: 0.22s; }
.mh-nav-item:hover .mh-mega-card:nth-child(6),
.mh-nav-item:focus-within .mh-mega-card:nth-child(6) { transition-delay: 0.26s; }

.mh-mega-card:hover {
  border-left-color: var(--mh-accent);
  background: rgba(255, 90, 95, 0.05);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
  transform: translateY(-2px) translateX(2px);
}

.mh-mega-card-icon {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--mh-accent);
  border-radius: 12px;
  background: var(--mh-accent-glow);
  transition: transform 0.3s var(--mh-ease-spring), background 0.25s var(--mh-ease-smooth);
}

.mh-mega-card:hover .mh-mega-card-icon {
  background: var(--mh-accent-strong);
  transform: scale(1.1);
}

.mh-mega-card-body {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.mh-mega-card-title {
  overflow: hidden;
  color: var(--mh-text);
  font-size: 15px;
  font-weight: 560;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mh-mega-card-desc {
  /* P2-5：菜单描述需可读，单独提色到 #515154（亮色 5.7:1 达 AA），
     不动全局 --mh-text-soft/--dm-text-secondary（影响面太大）。
     暗黑下用 --dm-text-secondary（#86868b 在 #000 底上 5.8:1 达 AA） */
  color: #515154;
  font-size: 13px;
  line-height: 1.4;
}
html.husir-dark .mh-mega-card-desc {
  color: var(--dm-text-secondary);
}
/* 系统暗黑分支：与手动分支对称，避免系统暗黑下菜单描述色不翻转 */
@media (prefers-color-scheme: dark) {
  html:not(.husir-light) .mh-mega-card-desc {
    color: var(--dm-text-secondary);
  }
}

.mh-mega-footer {
  position: relative;
  z-index: 1;
  padding: 10px 16px 6px;
  margin-top: 4px;
  border-top: 1px solid var(--mh-mega-border);
}

.mh-mega-footer-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--mh-accent);
  font-size: 14px;
  font-weight: 520;
  text-decoration: none;
  opacity: 0;
  transform: translateY(8px);
  transition:
    gap 0.25s var(--mh-ease-smooth),
    opacity 0.35s var(--mh-ease-out),
    transform 0.35s var(--mh-ease-out);
}

.mh-nav-item:hover .mh-mega-footer-link,
.mh-nav-item:focus-within .mh-mega-footer-link {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.3s;
}

.mh-mega-footer-link:hover {
  gap: 15px;
}

.mh-header-actions {
  z-index: 1;
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 6px;
}

.mh-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  height: 57px;
  padding: 0 20px;
  color: var(--mh-text);
  font-size: 20px;
  font-weight: 520;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  border: none;
  border-radius: 36px;
  background: transparent;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  transition:
    background 0.25s var(--mh-ease-smooth),
    color 0.25s var(--mh-ease-smooth),
    transform 0.25s var(--mh-ease-spring);
}

.mh-action-btn svg {
  flex: 0 0 auto;
  width: 27px;
  height: 27px;
}

/* 滚动时按钮只显示图标模式 */
.mh-action-btn.is-icon-only {
  padding: 0 14px;
  gap: 0;
}

.mh-action-btn.is-icon-only .mh-search-text,
.mh-action-btn.is-icon-only .mh-phone-text,
.mh-action-btn.is-icon-only .mh-kbd-hint {
  display: none;
}

.mh-kbd-hint {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 10px;
  color: var(--mh-text-soft);
  font-family: -apple-system, BlinkMacSystemFont, "SF Mono", ui-monospace, monospace;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: 0;
  border: 1px solid rgba(0, 0, 0, 0.07);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.04);
}

.mh-search-btn:hover .mh-kbd-hint {
  color: var(--mh-accent);
  border-color: rgba(255, 90, 95, 0.18);
  background: var(--mh-accent-glow);
}

.mh-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes mhSpinnerRotate {
  100% { transform: rotate(360deg); }
}

@keyframes mhSpinnerDash {
  0% { stroke-dashoffset: 0; }
  50% { stroke-dashoffset: -20; }
  100% { stroke-dashoffset: -62.8; }
}

@keyframes mhHotTagsSlideLeft {
  from {
    opacity: 0.35;
    transform: translateX(22px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 骨架屏加载态 */
.mh-skeleton-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 28px;
}

.mh-skeleton-icon {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.04) 25%, rgba(0, 0, 0, 0.08) 50%, rgba(0, 0, 0, 0.04) 75%);
  background-size: 200% 100%;
  animation: mhSkeletonShimmer 1.5s ease-in-out infinite;
}

.mh-skeleton-body {
  flex: 1 1 auto;
  min-width: 0;
}

.mh-skeleton-line {
  height: 14px;
  border-radius: 7px;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.04) 25%, rgba(0, 0, 0, 0.08) 50%, rgba(0, 0, 0, 0.04) 75%);
  background-size: 200% 100%;
  animation: mhSkeletonShimmer 1.5s ease-in-out infinite;
}

.mh-skeleton-line:first-child {
  width: 70%;
  height: 16px;
  margin-bottom: 8px;
}

.mh-skeleton-line:last-child {
  width: 45%;
  height: 12px;
}

@keyframes mhSkeletonShimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 暗黑模式已迁移至 dark-mode-core.css 统一控制（@media prefers-color-scheme + html.husir-dark） */

/* 旧 md-head 已由 modern-header 全端接管，保留 DOM 供兼容 */
.md-head {
  display: none !important;
}

/* ===== 汉堡按钮（≤833px 可用；桌面默认隐藏） ===== */
.mh-menu-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  color: var(--mh-text);
  border: none;
  border-radius: 12px;
  background: transparent;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  transition: background 0.25s var(--mh-ease-smooth);
}

.mh-menu-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition:
    transform 0.35s var(--mh-ease-out),
    opacity 0.25s var(--mh-ease-smooth),
    width 0.25s var(--mh-ease-smooth);
}

html.mh-menu-open .mh-menu-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

html.mh-menu-open .mh-menu-toggle__bar:nth-child(2) {
  opacity: 0;
  width: 0;
}

html.mh-menu-open .mh-menu-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== 移动端遮罩层 ===== */
.mh-mobile-backdrop {
  position: fixed;
  inset: 0;
  z-index: var(--dm-z-sticky, 9000);
  pointer-events: none;
  visibility: hidden;
  opacity: 0;
  background: var(--mh-command-backdrop);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  transition: opacity 0.35s var(--mh-ease-out), visibility 0.35s;
}

html.mh-menu-open .mh-mobile-backdrop {
  pointer-events: auto;
  visibility: visible;
  opacity: 1;
}

/* 1200-1399px：标准桌面自适应 */
@media (max-width: 1399px) and (min-width: 1200px) {
  :root {
    --mh-header-h: 120px;
  }

  .modern-header {
    --mh-header-h: 120px;
  }

  .mh-header-container {
    padding: 0 36px;
  }

  .modern-header.is-compact .mh-header-container {
    padding: 0 32px;
  }

  .mh-logo-img {
    height: 46px;
  }

  .mh-header-nav {
    margin: 0 36px;
  }

  .mh-nav-menu {
    padding: 5px;
    border-radius: 46px;
  }

  .mh-nav-link {
    min-height: 50px;
    padding: 12px 18px;
    font-size: 20px;
    border-radius: 40px;
  }

  .mh-action-btn {
    height: 48px;
    padding: 0 16px;
    font-size: 17px;
    border-radius: 30px;
  }

  .mh-action-btn.is-icon-only {
    padding: 0 12px;
  }

  .mh-action-btn svg {
    width: 23px;
    height: 23px;
  }

  .mh-mega-menu {
    width: 460px;
    max-width: min(460px, calc(100vw - 60px));
  }

  .mh-mega-inner {
    padding: 10px;
    border-radius: 26px;
  }

  .mh-mega-card {
    gap: 12px;
    padding: 12px 14px;
    border-radius: 18px;
  }

  .mh-mega-card-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
  }

  .mh-mega-card-title {
    font-size: 14px;
  }

  .mh-mega-card-desc {
    font-size: 12px;
  }

  .mh-mega-footer {
    padding: 8px 14px 5px;
  }

  .mh-mega-footer-link {
    font-size: 13px;
  }
}

/* 1000-1199px：小桌面/平板横屏自适应 */
@media (max-width: 1199px) and (min-width: 1000px) {
  :root {
    --mh-header-h: 100px;
  }

  .modern-header {
    --mh-header-h: 100px;
  }

  .mh-header-container {
    padding: 0 24px;
  }

  .modern-header.is-compact .mh-header-container {
    padding: 0 20px;
  }

  .mh-logo-img {
    height: 40px;
  }

  .mh-header-nav {
    margin: 0 24px;
  }

  .mh-nav-menu {
    padding: 4px;
    border-radius: 38px;
  }

  .mh-nav-link {
    min-height: 42px;
    padding: 10px 14px;
    font-size: 17px;
    border-radius: 34px;
  }

  .mh-action-btn {
    height: 40px;
    padding: 0 12px;
    font-size: 15px;
    border-radius: 24px;
  }

  .mh-action-btn.is-icon-only {
    padding: 0 10px;
  }

  .mh-action-btn svg {
    width: 20px;
    height: 20px;
  }

  .mh-kbd-hint {
    display: none;
  }

  .mh-phone-text {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .mh-search-text {
    display: none;
  }

  .mh-mega-menu {
    width: 400px;
    max-width: min(400px, calc(100vw - 48px));
  }

  .mh-mega-inner {
    padding: 8px;
    border-radius: 22px;
  }

  .mh-mega-grid {
    gap: 3px;
  }

  .mh-mega-card {
    gap: 10px;
    padding: 10px 12px;
    border-radius: 15px;
  }

  .mh-mega-card-icon {
    width: 32px;
    height: 32px;
    border-radius: 9px;
  }

  .mh-mega-card-title {
    font-size: 13px;
  }

  .mh-mega-card-desc {
    font-size: 11px;
  }

  .mh-mega-footer {
    padding: 6px 12px 4px;
    margin-top: 3px;
  }

  .mh-mega-footer-link {
    font-size: 11px;
  }
}

/* ===== 834-999px：iPad Pro 等横排菜单栏 ===== */
@media (max-width: 999px) and (min-width: 834px) {
  :root {
    --mh-header-h: 80px;
  }

  .modern-header {
    --mh-header-h: 80px;
  }

  .mh-header-container {
    padding: 0 16px;
  }

  .modern-header.is-compact .mh-header-container {
    padding: 0 14px;
  }

  .mh-logo-img {
    height: 34px;
  }

  .mh-header-nav {
    display: flex;
    position: static;
    flex: 1 1 auto;
    justify-content: center;
    width: auto;
    margin: 0 16px;
    pointer-events: auto;
    visibility: visible;
    transform: none;
  }

  .mh-nav-menu {
    flex-direction: row;
    align-items: center;
    max-width: 100%;
    height: auto;
    padding: 3px;
    overflow: visible;
    border-radius: 30px;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.03);
  }

  .mh-nav-link {
    min-height: 34px;
    padding: 8px 10px;
    font-size: 15px;
    border-radius: 26px;
    white-space: nowrap;
  }

  .mh-action-btn {
    height: 34px;
    padding: 0 10px;
    font-size: 13px;
    border-radius: 20px;
    width: auto;
  }

  .mh-action-btn svg {
    width: 18px;
    height: 18px;
  }

  .mh-kbd-hint {
    display: none;
  }

  .mh-phone-text {
    display: none;
  }

  .mh-phone-btn {
    width: 34px;
    padding: 0;
    gap: 0;
    justify-content: center;
  }

  .mh-search-text {
    display: none;
  }

  .mh-mega-menu {
    position: absolute;
    width: 340px;
    max-width: min(340px, calc(100vw - 32px));
  }

  .mh-scroll-progress {
    height: 3px;
  }
}

/* 1000-1199px：平板横屏，电话仅图标 */
@media (max-width: 1199px) and (min-width: 1000px) {
  .mh-phone-text {
    display: none;
  }

  .mh-phone-btn {
    width: 40px;
    padding: 0;
    gap: 0;
    justify-content: center;
  }
}

/* ===== 断点：≤833px（手机端顶栏与抽屉） ===== */
@media (max-width: 833px) {
  :root {
    --mh-header-h: 56px;
    --mob-head-hd-offset: 56px;
  }

  .modern-header {
    --mh-header-h: 56px;
    --mh-pill-mt: 0;
    left: 0;
    width: 100%;
    max-width: none;
    margin-top: 0;
    border: none;
    border-radius: 0;
    transform: none;
    box-shadow: var(--mh-shadow);
  }

  .modern-header.is-compact {
    left: 0;
    width: 100%;
    max-width: none;
    margin-top: 0;
    border: none;
    border-radius: 0;
    transform: none;
  }

  .mh-header-container {
    justify-content: space-between;
    gap: 0;
    padding: 0 12px;
    min-width: auto;
  }

  .mh-header-logo {
    flex: 0 0 auto;
    min-width: 0;
    max-width: none;
  }

  .mh-logo-link {
    display: block;
    width: auto;
    max-width: none;
  }

  .mh-logo-img {
    width: auto;
    max-width: none;
    height: 47px;
    max-height: none;
  }

  .mh-header-nav {
    position: fixed;
    top: calc(env(safe-area-inset-top, 0px) + var(--mh-header-h));
    right: 0;
    bottom: 0;
    left: auto;
    z-index: var(--dm-z-dropdown, 10030);
    flex: none;
    width: min(100%, 320px);
    margin: 0;
    pointer-events: none;
    visibility: hidden;
    transform: translateX(100%);
    transition:
      transform 0.4s var(--mh-ease-out),
      visibility 0.4s;
  }

  html.mh-menu-open .mh-header-nav {
    pointer-events: auto;
    visibility: visible;
    transform: translateX(0);
  }

  .mh-nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    max-width: none;
    height: 100%;
    padding: 12px 10px calc(24px + env(safe-area-inset-bottom, 0px));
    overflow-x: hidden;
    overflow-y: auto;
    border-radius: 0;
    background: var(--mh-bg);
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.12);
    -webkit-overflow-scrolling: touch;
  }

  .mh-nav-item {
    width: 100%;
  }

  .mh-nav-item.has-mega {
    padding-bottom: 0;
    margin-bottom: 0;
  }

  .mh-nav-link {
    justify-content: space-between;
    min-height: 48px;
    padding: 12px 14px;
    font-size: 17px;
    font-weight: 500;
    border-radius: 12px;
    white-space: normal;
  }

  .mh-nav-link:hover {
    transform: none;
  }

  .mh-chevron {
    opacity: 0.7;
    transition: transform 0.3s var(--mh-ease-spring);
  }

  .mh-nav-item.is-expanded .mh-chevron {
    transform: rotate(180deg);
    opacity: 1;
  }

  .mh-mega-menu {
    position: static;
    left: auto;
    width: 100%;
    max-width: none;
    pointer-events: auto;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: none;
    transition:
      max-height 0.35s var(--mh-ease-out),
      opacity 0.25s ease,
      visibility 0.25s;
  }

  .mh-nav-item.is-expanded .mh-mega-menu {
    visibility: visible;
    max-height: 520px;
    opacity: 1;
  }

  .mh-mega-inner {
    padding: 4px 0 8px;
    border: none;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .mh-mega-inner::after {
    display: none;
  }

  .mh-mega-grid {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .mh-mega-card {
    gap: 10px;
    padding: 10px 12px 10px 20px;
    border-left: none;
    border-radius: 10px;
    opacity: 1;
    transform: none;
    transition: background 0.2s ease;
  }

  .mh-mega-card-desc {
    display: none;
  }

  .mh-mega-footer {
    padding: 6px 12px 2px 20px;
    margin-top: 0;
    border-top: none;
  }

  .mh-mega-footer-link {
    opacity: 1;
    transform: none;
    font-size: 14px;
  }

  .mh-header-actions {
    gap: 4px;
  }

  /* 手机端保留完整站点菜单；底部导航只承担五个高频入口。 */
  .mh-menu-toggle {
    display: inline-flex !important;
  }

  .mh-action-btn {
    width: auto;
    min-width: 44px;
    height: 44px;
    padding: 0 12px;
    gap: 8px;
    justify-content: center;
    border-radius: 12px;
  }

  .mh-action-btn svg {
    width: 20px;
    height: 20px;
  }

  .mh-search-text,
  .mh-phone-text,
  .mh-kbd-hint {
    display: none;
  }

  /* 电话入口复用桌面 DOM，手机端收口为与搜索一致的纯图标触控区。 */
  .mh-phone-btn {
    width: 44px;
    padding: 0;
    gap: 0;
  }

  html.mh-menu-open,
  html.mh-menu-open body {
    overflow: hidden;
  }
}

/* ===== 断点：小屏手机 ≤480px ===== */
@media (max-width: 480px) {
  :root {
    --mh-header-h: 52px;
    --mob-head-hd-offset: 52px;
  }

  .modern-header {
    --mh-header-h: 52px;
  }

  .mh-header-container {
    padding: 0 10px;
  }

  .mh-logo-img {
    height: 32px;
  }

  .mh-header-nav {
    width: 100%;
  }

  .mh-nav-link {
    min-height: 44px;
    padding: 10px 12px;
    font-size: 16px;
  }

  .mh-mega-card-title {
    font-size: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .modern-header,
  .mh-scroll-progress,
  .mh-nav-link,
  .mh-chevron,
  .mh-mega-menu,
  .mh-mega-card,
  .mh-mega-footer-link,
  .mh-action-btn,
  .mh-logo-link {
    animation: none !important;
    transition: none !important;
  }
}

/* ============================================================
   无障碍跳转链接（WCAG 2.4.1 跳转到主内容）
   默认移出视口不可见，键盘 Tab 聚焦时回到顶部显现
   配色引用 --dm-accent（亮暗自适应，由 dark-mode-core.css 统一定义）
   ============================================================ */
.mh-skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--dm-z-tooltip, 10600);
  /* 背景与文字共同使用全局强调色令牌，亮暗模式自动保证对比度。 */
  background: var(--dm-accent, #c63f00);
  color: var(--dm-on-accent, #ffffff);
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  border-radius: 0 0 12px 0;
  /* 默认移出视口，避免被屏幕阅读器误读为可见内容 */
  transform: translateY(-150%);
  transition: transform 0.18s ease-out;
}

.mh-skip-link:focus,
.mh-skip-link:focus-visible {
  transform: translateY(0);
  outline: 3px solid #fff;
  outline-offset: 2px;
}

/* 减少动效偏好：跳转链接位移改为瞬时 */
@media (prefers-reduced-motion: reduce) {
  .mh-skip-link {
    transition: none;
  }
}