/* 龙崽工具箱 v1 · layout.css —— 应用外壳：侧栏 / 顶栏 / 内容区 / 移动抽屉 / 底部 Tab */
#app { height: 100vh;
 height: 100dvh; display: grid; grid-template-columns: var(--sidebar-w) 1fr; grid-template-rows: 1fr; }

/* 侧栏 */
.sidebar { display: flex; flex-direction: column; gap: 6px; padding: 16px 12px;
  background: var(--surface); -webkit-backdrop-filter: var(--glass-blur);
 backdrop-filter: var(--glass-blur); border-right: 1px solid var(--border);
  overflow-y: auto; z-index: 40; }
.brand { display: flex; align-items: center; gap: 11px; padding: 6px 8px 16px; }
.brand img { width: 40px; height: 40px; border-radius: 11px; box-shadow: var(--shadow-gold); }
.brand b { font-size: 16.5px; letter-spacing: .5px;
  background: linear-gradient(120deg, var(--gold-2), var(--gold)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.brand small { display: block; color: var(--text-faint); font-size: 11px; letter-spacing: 1px; }
.nav-group-label { font-size: 11px; color: var(--text-faint); padding: 12px 10px 4px; letter-spacing: 1px; }
.nav-item { display: flex; align-items: center; gap: 11px; padding: 10px 12px; border-radius: 10px; cursor: pointer;
  color: var(--text-dim); font-weight: 550; border: 1px solid transparent; transition: .15s; position: relative; }
.nav-item:hover { background: var(--hover); color: var(--text); }
.nav-item.active { background: var(--active-grad); color: var(--gold-2); border-color: var(--border); }
.nav-item.active::before { content: ""; position: absolute; left: -12px; top: 20%; bottom: 20%; width: 3px; border-radius: 3px;
  background: linear-gradient(var(--gold-2), var(--gold-deep)); }
.nav-item .ic { opacity: .85; }
.nav-item .nav-tag { margin-left: auto; font-size: 10.5px; color: var(--gold-2); }

/* 主区域 */
.main { display: flex; flex-direction: column; min-width: 0; height: 100vh;
 height: 100dvh; }
.topbar { height: var(--topbar-h); flex: none; display: flex; align-items: center; gap: 12px; padding: 0 20px;
  background: var(--head-bg); -webkit-backdrop-filter: var(--glass-blur);
 backdrop-filter: var(--glass-blur); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 30; }
.icon-menu { display: none; }
.topbar-title { font-weight: 650; font-size: 16px; }
.unit-select { min-width: 180px; max-width: 320px; padding: 7px 30px 7px 12px; font-size: 13.5px; }
.net-dot { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--text-dim); }
.net-dot i { width: 8px; height: 8px; border-radius: 50%; background: var(--exact); box-shadow: 0 0 8px var(--exact); }
.net-dot.offline i { background: var(--unknown); box-shadow: none; }
.content { flex: 1; overflow-y: auto; padding: 22px 24px 40px; scroll-behavior: smooth; }
.view { max-width: 1500px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; animation: view-in .28s var(--ease); }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 14px; flex-wrap: wrap; }
.page-head h2 { font-size: 21px; } .page-head p { color: var(--text-dim); font-size: 13px; margin-top: 3px; }
.page-head-actions { display: flex; gap: 9px; flex-wrap: wrap; }

/* 移动抽屉 */
.drawer-mask { position: fixed; top:0;right:0;bottom:0;left:0;
 inset:0; background: var(--scrim); z-index: 45; display: none; }
.drawer-mask.open { display: block; }
.sidebar.drawer { position: fixed; left: 0; top: 0; bottom: 0; width: min(82vw, 300px); transform: translateX(-105%);
  transition: transform .28s var(--ease); z-index: 50; background: var(--surface-solid); }
.sidebar.drawer.open { transform: translateX(0); }
/* 底部 Tab（手机） */
.tabbar { display: none; }

/* 超宽屏（2K/4K）居中限宽，字号微增 */
@media (min-width: 2200px) { :root { font-size: 16px; } .view { max-width: 1760px; } }
/* 平板/手机 */
@media (max-width: 900px) {
  #app { grid-template-columns: 1fr; }
  .sidebar.desktop { display: none; }
  .icon-menu { display: inline-grid; }
  .content { padding: 16px 14px 84px; }
  :root { --topbar-h: 54px; }
  .topbar { padding: 0 12px; gap: 8px; }
  .unit-select { min-width: 0; flex: 1; }
  .tabbar { display: flex; position: fixed; left: 0; right: 0; bottom: 0; height: 60px; z-index: 35;
    background: var(--head-bg); -webkit-backdrop-filter: var(--glass-blur);
 backdrop-filter: var(--glass-blur); border-top: 1px solid var(--border);
    padding-bottom: env(safe-area-inset-bottom); }
  .tabbar .tab { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
    color: var(--text-faint); font-size: 10.5px; cursor: pointer; border: 0; background: none; }
  .tabbar .tab.active { color: var(--gold-2); }
}
@media (max-width: 400px) { .page-head h2 { font-size: 18px; } .btn { padding: 8px 12px; } }