/* ===== layout.css · 顶部横向导航 + 面包屑 + 内容区 + 响应式 ===== */

/* ---- 应用壳 grid 布局：顶栏(含菜单) + 内容区 ---- */
.app-shell {
  display: grid;
  grid-template-rows: var(--topbar-h) 1fr;
  grid-template-areas: "topbar" "main";
  min-height: 100vh;
}

/* ---- 顶部品牌栏 + 横向菜单 ---- */
#topbar {
  grid-area: topbar;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 60;
}
.topbar-inner {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 16px;
}
.brand { font-weight: 700; font-size: 1.02rem; display: flex; align-items: center; gap: 8px; white-space: nowrap; }
.brand .ver { font-size: .6rem; padding: 2px 7px; border-radius: 10px; background: var(--primary); color: #fff; font-weight: 600; }
.topbar-right { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.hamburger { display: none; background: none; border: none; font-size: 1.4rem; cursor: pointer; color: var(--text); padding: 4px 8px; line-height: 1; }

/* ---- 顶部横向导航 ---- */
.topnav {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0 6px;
  min-width: 0;
}

.topnav-group { position: relative; }
.topnav-trigger {
  display: flex; align-items: center; gap: 6px;
  background: none; border: none; cursor: pointer;
  padding: 8px 14px; border-radius: 10px;
  font-size: .88rem; color: var(--text); white-space: nowrap;
  font-family: inherit;
}
.topnav-trigger:hover { background: var(--sidebar-item-hover-bg); }
.topnav-group.active > .topnav-trigger { color: var(--primary); font-weight: 600; background: var(--sidebar-item-active-bg); }
.topnav-group.disabled > .topnav-trigger { opacity: .45; cursor: not-allowed; }
.caret { font-size: .7rem; opacity: .7; margin-left: 1px; }

.topnav-dropdown {
  display: none;
  position: absolute; top: calc(100% + 6px); left: 0;
  min-width: 208px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-float);
  padding: 6px;
  z-index: 70;
}
/* 透明桥接：填补 trigger 与下拉之间的 6px 缝隙，避免鼠标下移时 hover 中断导致下拉消失 */
.topnav-dropdown::before {
  content: '';
  position: absolute;
  left: 0; right: 0; top: -8px;
  height: 8px;
}
.topnav-group:hover .topnav-dropdown,
.topnav-group.open .topnav-dropdown { display: block; }

.topnav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: 8px;
  font-size: .85rem; color: var(--text); cursor: pointer; white-space: nowrap;
}
.topnav-item .icon { font-size: .95rem; width: 18px; text-align: center; }
.topnav-item:hover { background: var(--sidebar-item-hover-bg); }
.topnav-item.active { background: var(--sidebar-item-active-bg); color: var(--primary); font-weight: 600; }
.topnav-item.disabled { opacity: .45; cursor: not-allowed; }
.topnav-item.disabled:hover { background: none; }

.topnav-link {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 14px; border-radius: 10px; cursor: pointer; white-space: nowrap;
  font-size: .88rem; color: var(--text);
}
.topnav-link:hover { background: var(--sidebar-item-hover-bg); }
.topnav-link.active { color: var(--primary); font-weight: 600; background: var(--sidebar-item-active-bg); }
.topnav-link.disabled { opacity: .45; cursor: not-allowed; }

.topnav-overlay { display: none; position: fixed; inset: var(--topbar-h) 0 0 0; background: rgba(0,0,0,.3); z-index: 55; }
.topnav-overlay.show { display: block; }

/* ---- 面包屑 ---- */
#breadcrumb {
  padding: 12px 0; font-size: .82rem; color: var(--text2);
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}
.crumb.active { color: var(--text); font-weight: 600; }
.crumb-sep { color: var(--text2); opacity: .6; }

/* ---- 内容区 ---- */
#main-area {
  grid-area: main;
  padding: 0 var(--content-padding);
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
#app-content { flex: 1; padding-bottom: 20px; min-width: 0; }
#app-footer {
  text-align: center; font-size: .75rem; color: var(--text2);
  padding: 20px 0; border-top: 1px solid var(--border); margin-top: auto;
}

/* ---- 响应式：窄屏将横向菜单收进抽屉 ---- */
@media (max-width: 767px) {
  .topnav {
    display: none;
    position: absolute; top: var(--topbar-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--card); border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-float);
    max-height: calc(100vh - var(--topbar-h)); overflow-y: auto;
    margin: 0; padding: 8px; z-index: 65;
  }
  .topnav.open { display: flex; }
  .topnav-group { position: static; }
  .topnav-trigger { width: 100%; justify-content: flex-start; }
  .topnav-dropdown {
    position: static; display: block; box-shadow: none;
    border: none; padding-left: 14px; min-width: 0;
  }
  .topnav-group:hover .topnav-dropdown { display: block; }
  .caret { display: none; }
  .hamburger { display: block; }
}

/* 平板（768-960）：紧凑间距，确保 5 个分组塞得下 */
@media (min-width: 768px) and (max-width: 960px) {
  .topnav { gap: 0; }
  .topnav-trigger { padding: 8px 10px; font-size: .84rem; }
  .topbar-inner { gap: 6px; padding: 0 10px; }
}