/* ============================================================
   shell.css — 顶栏 / 导航 / 页脚（所有页面共用）
   ============================================================ */

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(15, 17, 19, 0.86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.topbar__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 16px;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-shrink: 0;
}

.brand__mark {
  width: 26px;
  height: 26px;
  border-radius: 5px;
  display: grid;
  place-items: center;
  background: #e6e8ea;
  color: #101214;
  flex-shrink: 0;
}

.brand__name {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* 导航 */
.nav {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}

.nav__link {
  padding: 5px 10px;
  border-radius: var(--r-sm);
  font-size: 13px;
  color: var(--text-2);
  transition: color var(--fast) var(--ease), background var(--fast) var(--ease);
}
.nav__link:hover { color: var(--text); background: rgba(255, 255, 255, 0.05); }
.nav__link[aria-current="page"] { color: var(--text); background: rgba(255, 255, 255, 0.08); }

/* 右侧搜索 */
.topsearch {
  position: relative;
  margin-left: auto;
  flex: 0 1 260px;
  min-width: 0;
}
.topsearch .field {
  padding-left: 32px;
  padding-right: 26px;
  min-width: 0;
  background: rgba(255, 255, 255, 0.05);
  border-color: transparent;
}
.topsearch .field:focus { background: var(--surface-2); border-color: var(--accent); }
.topsearch__icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  pointer-events: none;
}
.topsearch__key {
  position: absolute;
  right: 7px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--text-3);
  border: 1px solid var(--line-2);
  border-radius: 3px;
  padding: 0 4px;
  pointer-events: none;
}

.topstat {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--text-3);
  white-space: nowrap;
}
@media (max-width: 720px) { .topstat { display: none; } }
@media (max-width: 640px) { .topsearch__key { display: none; } }
@media (max-width: 520px) {
  .topbar__inner { gap: 10px; padding: 0 12px; }
  .nav__link { padding: 5px 7px; }
  .topsearch { flex-basis: 90px; }
  .topsearch .field { padding-left: 28px; font-size: 12px; }
  .topsearch__icon { left: 8px; }
}

/* 页脚 */
.foot {
  margin-top: 56px;
  border-top: 1px solid var(--line);
  padding: 22px 0 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 12px;
  color: var(--text-3);
}
.foot a { color: var(--text-2); }
.foot a:hover { color: var(--accent); }