/* ============================================================
   站点结构：顶栏 / 侧栏 / 页脚 / 命令面板
   ============================================================ */

/* ---------- 顶栏 ---------- */
.hdr {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg-elev) 82%, transparent);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--border);
}
.hdr-in { display: flex; align-items: center; gap: 16px; height: var(--header-h); }

.logo { display: flex; align-items: center; gap: 10px; flex: none; }
.logo-mark {
  width: 32px; height: 32px; border-radius: 9px; flex: none;
  background: linear-gradient(145deg, var(--brand-400) 0%, var(--brand-500) 40%, var(--violet-600) 72%, var(--teal-500) 110%);
  display: grid; place-items: center;
  box-shadow:
    0 3px 10px rgba(77, 107, 254, .35),
    0 0 0 1px rgba(255, 255, 255, .12) inset,
    inset 0 1.5px 0 rgba(255, 255, 255, .28);
  position: relative; overflow: hidden;
}
.logo-mark::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,.22) 0%, rgba(255,255,255,0) 55%);
  pointer-events: none;
}
.logo-mark svg { width: 18px; height: 18px; color: #fff; position: relative; z-index: 1; }
.logo-txt { font-size: 15.5px; font-weight: 760; letter-spacing: -.03em; }
.logo-txt em { font-style: normal; color: var(--accent); font-weight: 700; }
.logo-sub {
  font-size: 9.5px; font-weight: 620; letter-spacing: .1em; text-transform: uppercase;
  color: var(--text-4); display: block; margin-top: -3px;
}

.nav { display: flex; align-items: center; gap: 2px; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a {
  padding: 6px 11px; border-radius: var(--r-sm);
  font-size: var(--fs-sm); font-weight: 550; color: var(--text-3);
  white-space: nowrap; transition: color var(--t-fast), background var(--t-fast);
}
.nav a:hover { color: var(--text); background: var(--surface-3); }
.nav a.on { color: var(--accent); background: var(--accent-soft); font-weight: 620; }

/* 搜索触发器 */
.search-trigger {
  display: flex; align-items: center; gap: 8px;
  height: 32px; min-width: 190px; padding: 0 10px;
  border: 1px solid var(--border); border-radius: var(--r-md);
  background: var(--surface-2); color: var(--text-4);
  font-size: var(--fs-sm); cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast);
}
.search-trigger:hover { border-color: var(--border-2); background: var(--surface); }
.search-trigger svg { width: 14px; height: 14px; flex: none; }
.search-trigger .kbd-hint { margin-left: auto; }

.kbd {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 18px; height: 18px; padding: 0 4px;
  border: 1px solid var(--border-2); border-bottom-width: 2px;
  border-radius: var(--r-xs);
  background: var(--surface);
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  color: var(--text-3);
}

/* ---------- 页脚 ---------- */
.ftr {
  margin-top: 72px; padding: 44px 0 32px;
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
}
.ftr-grid {
  display: grid; grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 36px; margin-bottom: 32px;
}
.ftr h4 {
  font-size: var(--fs-xs); font-weight: 700; letter-spacing: .09em;
  text-transform: uppercase; color: var(--text-4); margin-bottom: 12px;
}
.ftr-links { display: flex; flex-direction: column; gap: 8px; }
.ftr-links a { font-size: var(--fs-sm); color: var(--text-3); transition: color var(--t-fast); }
.ftr-links a:hover { color: var(--accent); }
.ftr-bot {
  padding-top: 22px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  gap: 14px; flex-wrap: wrap;
  font-size: var(--fs-xs); color: var(--text-4);
}

/* ---------- 命令面板 ---------- */
.cmdk {
  position: fixed; inset: 0; z-index: 300;
  display: none; align-items: flex-start; justify-content: center;
  padding: 10vh 20px 20px;
}
.cmdk.open { display: flex; }
.cmdk-veil {
  position: absolute; inset: 0;
  background: rgba(10, 12, 17, .5);
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
  animation: fadeIn var(--t-fast) both;
}
.cmdk-box {
  position: relative; width: 100%; max-width: 660px;
  background: var(--bg-elev);
  border: 1px solid var(--border-2);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  animation: popIn var(--t-base) both;
}
.cmdk-head {
  display: flex; align-items: center; gap: 11px;
  padding: 14px 18px; border-bottom: 1px solid var(--border);
}
.cmdk-head svg { width: 17px; height: 17px; color: var(--text-4); flex: none; }
.cmdk-input {
  flex: 1; border: 0; background: none; outline: none;
  font-size: var(--fs-lg); font-weight: 500;
}
.cmdk-input::placeholder { color: var(--text-4); font-weight: 400; }
.cmdk-count { font-size: var(--fs-xs); color: var(--text-4); font-variant-numeric: tabular-nums; }

.cmdk-list { max-height: 54vh; overflow-y: auto; padding: 7px; }
.cmdk-group {
  padding: 9px 11px 5px;
  font-size: 10px; font-weight: 700; letter-spacing: .09em;
  text-transform: uppercase; color: var(--text-4);
}
.cmdk-item {
  display: flex; align-items: center; gap: 11px;
  padding: 8px 11px; border-radius: var(--r-md);
  cursor: pointer; transition: background var(--t-fast);
}
.cmdk-item:hover, .cmdk-item.sel { background: var(--surface-3); }
.cmdk-item.sel { box-shadow: inset 0 0 0 1px var(--border-2); }
.cmdk-ico {
  width: 26px; height: 26px; border-radius: var(--r-sm); flex: none;
  display: grid; place-items: center;
  background: var(--surface-3); font-size: 13px;
}
.cmdk-item img.cmdk-ico { object-fit: cover; }
.cmdk-main { flex: 1; min-width: 0; }
.cmdk-title { font-size: var(--fs-sm); font-weight: 600; }
.cmdk-title mark { background: rgba(251,191,36,.4); color: inherit; border-radius: 2px; padding: 0 1px; }
html[data-theme="dark"] .cmdk-title mark { background: rgba(251,191,36,.28); }
.cmdk-desc { font-size: var(--fs-xs); color: var(--text-3); }
.cmdk-meta { display: flex; align-items: center; gap: 8px; flex: none; }
.cmdk-foot {
  display: flex; align-items: center; gap: 16px;
  padding: 9px 16px; border-top: 1px solid var(--border);
  background: var(--surface-2);
  font-size: var(--fs-xs); color: var(--text-4);
}
.cmdk-empty { padding: 40px 20px; text-align: center; color: var(--text-4); font-size: var(--fs-sm); }

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--surface); border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  display: grid; place-items: center;
  opacity: 0; pointer-events: none;
  transition: opacity var(--t-base), transform var(--t-base), background var(--t-fast);
  transform: translateY(8px);
}
.to-top.show { opacity: 1; pointer-events: auto; transform: none; }
.to-top:hover { background: var(--surface-3); }
.to-top svg { width: 17px; height: 17px; color: var(--text-2); }

/* ---------- 提示条 ---------- */
.toast {
  position: fixed; left: 50%; bottom: 28px; z-index: 400;
  transform: translate(-50%, 18px);
  padding: 9px 17px; border-radius: var(--r-full);
  background: var(--text); color: var(--bg);
  font-size: var(--fs-sm); font-weight: 550;
  box-shadow: var(--shadow-lg);
  opacity: 0; pointer-events: none;
  transition: opacity var(--t-base), transform var(--t-base);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 面包屑 ---------- */
.crumbs {
  display: flex; align-items: center; gap: 7px; flex-wrap: wrap;
  font-size: var(--fs-sm); color: var(--text-4); padding: 18px 0 0;
}
.crumbs a { color: var(--text-3); transition: color var(--t-fast); }
.crumbs a:hover { color: var(--accent); }
.crumbs .sep { opacity: .5; }
.crumbs .cur { color: var(--text-2); font-weight: 550; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .ftr-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 820px) {
  .wrap { padding: 0 16px; }
  .nav { display: none; }
  .search-trigger { min-width: 0; }
  .search-trigger .st-label, .search-trigger .kbd-hint { display: none; }
  .search-trigger { width: 32px; justify-content: center; padding: 0; }
  h1 { font-size: var(--fs-3xl); }
  .logo-sub { display: none; }
}
@media (max-width: 560px) {
  .ftr-grid { grid-template-columns: 1fr; gap: 22px; }
}