/* ════════════════════════════════════════════════════════════
   公共 Masthead 样式 — 强制 4 页 (index/admin/dashboard/ai-dashboard)
   顶部 UI 严格一致,消除切换页时的"跳动"

   策略:
   1) `body .masthead*` 提升特异性 (0,1,1) 击败页面内联 `.masthead*` (0,1,0)
   2) 关键视觉属性追加 !important,彻底覆盖各页面残留差异
   ════════════════════════════════════════════════════════════ */

body .masthead {
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  padding: 0 24px !important;
  height: 56px !important;
  background: var(--bg-1, #141310) !important;
  border-bottom: 1px solid var(--line, rgba(244,238,221,0.06)) !important;
  position: fixed !important;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  font-family: 'Inter', 'Noto Sans SC', 'PingFang SC', system-ui, sans-serif;
}

body .masthead-logo {
  font-family: 'Instrument Serif', serif !important;
  font-size: 1.25rem !important;
  color: var(--ink-hi, var(--text-0, var(--t1, #F4EEDD))) !important;
  letter-spacing: -0.02em !important;
  display: flex !important;
  align-items: center !important;
  gap: 2px !important;
}
/* 把句点字符替换成一个真正垂直居中的小圆点 */
body .masthead-logo .dot {
  font-size: 0 !important;            /* 隐藏 "." 字符 */
  width: 4px !important;
  height: 4px !important;
  border-radius: 50% !important;
  background: var(--accent, var(--accent-serif, #D4845A)) !important;
  display: inline-block !important;
  align-self: center !important;
  margin: 0 5px !important;
  line-height: 1 !important;
  flex-shrink: 0 !important;
}

body .masthead-nav {
  display: flex !important;
  gap: 4px !important;
  align-items: center !important;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
body .masthead-nav::-webkit-scrollbar { display: none; }

body .masthead-nav a {
  font-size: 0.82rem !important;
  color: var(--ink-lo, var(--text-2, var(--t2, #8A8269))) !important;
  text-decoration: none !important;
  padding: 6px 14px !important;
  border-radius: 8px !important;
  transition: all .2s !important;
  white-space: nowrap !important;
  flex-shrink: 0 !important;
  font-weight: 400 !important;
  line-height: 1.4 !important;
  background: transparent;
}
body .masthead-nav a:hover {
  color: var(--ink-hi, var(--text-0, var(--t1, #F4EEDD))) !important;
  background: var(--bg-2, #1C1A15) !important;
}
body .masthead-nav a.active {
  color: var(--accent, var(--accent-serif, #D4845A)) !important;
  background: var(--accent-dim, var(--accent-soft, var(--accent-lo, rgba(212,132,90,0.12)))) !important;
  font-weight: 500 !important;
}

body .masthead-right {
  display: flex !important;
  align-items: center !important;
  gap: 12px !important;
}

body .masthead-right .user-info,
body .masthead .user-info {
  display: flex !important;
  align-items: center !important;
  gap: 8px !important;
  font-size: 0.8rem !important;
  color: var(--ink-lo, var(--text-2, var(--t2, #8A8269))) !important;
}
body .masthead-right .user-info span:first-child,
body .masthead .user-info span:first-child {
  color: var(--ink-hi, var(--text-0, var(--t1, #F4EEDD))) !important;
  font-weight: 500 !important;
}

body .level-badge {
  font-family: 'JetBrains Mono', monospace !important;
  font-size: 10px !important;
  font-weight: 500 !important;
  padding: 2px 8px !important;
  border: 1px solid var(--accent, #D4845A) !important;
  color: var(--accent, #D4845A) !important;
  border-radius: 4px !important;
  margin-left: 0 !important;
  background: transparent !important;
}

body .btn-logout {
  padding: 5px 12px !important;
  font-size: 0.75rem !important;
  background: transparent !important;
  border: 1px solid var(--line-hi, var(--line, rgba(244,238,221,0.18))) !important;
  border-radius: 6px !important;
  color: var(--ink-lo, var(--text-2, var(--t2, #8A8269))) !important;
  cursor: pointer;
  transition: all .2s;
  font-family: inherit;
}
body .btn-logout:hover {
  background: var(--err-dim, rgba(226,119,113,0.1)) !important;
  border-color: var(--err, #E27771) !important;
  color: var(--err, #E27771) !important;
}

/* notif-bell — admin masthead 中的铃铛是侧边栏"通知"入口的冗余快捷方式,
   为保 4 页顶部视觉一致,在 masthead 内统一隐藏(不影响侧边栏入口) */
body .masthead .notif-bell { display: none !important; }

/* ── Logo dot pulse(全站统一品牌动效) ── */
body .masthead-logo .dot {
  animation: mastheadDotPulse 3.6s cubic-bezier(.4,0,.2,1) infinite;
}
@keyframes mastheadDotPulse {
  0%, 100% { transform: scale(1);    background-color: var(--accent, var(--accent-serif, #D4845A)); }
  50%      { transform: scale(1.25); background-color: var(--flow, #7AA8FF); }
}

/* ── 响应式: 平板(<=960px) ── */
@media (max-width: 960px) {
  body .masthead { padding: 0 18px !important; }
}

/* ── 响应式: 手机(<=640px) ── 统一为换行第 3 行 + 横向滚动 */
@media (max-width: 640px) {
  body .masthead {
    height: auto !important;
    flex-wrap: wrap !important;
    padding: 10px 12px !important;
    gap: 8px !important;
  }
  body .masthead-logo { font-size: 1.05rem !important; }
  body .masthead-nav {
    order: 3 !important;
    width: 100% !important;
    overflow-x: auto !important;
    white-space: nowrap !important;
    -webkit-overflow-scrolling: touch;
    gap: 6px !important;
    padding-top: 8px !important;
    border-top: 1px solid var(--line, rgba(244,238,221,0.06)) !important;
    display: flex !important;
  }
  body .masthead-nav a { font-size: 0.8rem !important; padding: 6px 10px !important; }
  body .masthead-right { gap: 8px !important; }
  body .masthead-right .user-info { font-size: 0.75rem !important; }
  body .masthead-right .user-info span:first-child {
    max-width: 80px !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    white-space: nowrap !important;
    display: inline-block !important;
    vertical-align: bottom;
  }
}

/* ════════════════════════════════════════════════════════════
   H5 通用兜底: fixed masthead 在 ≤640px 时换行撑到 ~130px+,
   给含 masthead 的页面 body 加 padding-top, 避免首屏内容被遮.
   用 :has() 精准定位 (Chrome 105+ / Safari 15.4+ 主流支持).
   ════════════════════════════════════════════════════════════ */
@media (max-width: 640px) {
  body:has(> .masthead),
  body:has(header.masthead) {
    padding-top: 130px;
  }
}
@media (max-width: 360px) {
  body:has(> .masthead),
  body:has(header.masthead) {
    padding-top: 150px;
  }
}