/* =====================================================================
   Layout: Sidebar + Topbar + Content
   ===================================================================== */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
  transition: grid-template-columns var(--transition);
}
.app.collapsed { grid-template-columns: var(--sidebar-w-collapsed) 1fr; }

/* ---------- Sidebar ---------- */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 40;
  overflow: hidden;
}
.sidebar__brand {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 18px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.sidebar__logo {
  width: 38px; height: 38px; flex-shrink: 0;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--brand-500), var(--accent-2));
  display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 18px;
  box-shadow: var(--shadow-glow);
}
.sidebar__title { display: flex; flex-direction: column; line-height: 1.2; white-space: nowrap; }
.sidebar__title b { font-size: 15px; letter-spacing: -0.2px; }
.sidebar__title span { font-size: 11px; color: var(--text-3); }
.app.collapsed .sidebar__title { display: none; }

.sidebar__nav { flex: 1; overflow-y: auto; padding: 12px 10px; }
.sidebar__nav::-webkit-scrollbar { width: 6px; }

.nav-group { margin-bottom: 4px; }
.nav-group__header {
  display: flex; align-items: center; gap: 11px;
  padding: 11px 12px;
  border-radius: var(--r);
  color: var(--text-2);
  font-weight: 600; font-size: 13.5px;
  cursor: pointer;
  user-select: none;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.nav-group__header:hover { background: var(--surface-2); color: var(--text); }
.nav-group__header .nav-ico { flex-shrink: 0; width: 20px; height: 20px; color: var(--text-3); }
.nav-group__header:hover .nav-ico { color: var(--brand-500); }
.nav-group__label { flex: 1; }
.nav-group__chev { transition: transform var(--transition); width: 16px; height: 16px; color: var(--text-3); }
.nav-group.open .nav-group__chev { transform: rotate(90deg); }
.app.collapsed .nav-group__label,
.app.collapsed .nav-group__chev { display: none; }

.nav-group__items {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--transition);
}
.nav-group.open .nav-group__items { grid-template-rows: 1fr; }
.nav-group__items > div { overflow: hidden; }

.nav-item {
  display: flex; align-items: center; gap: 10px;
  margin: 2px 0 2px 0;
  padding: 9px 12px 9px 43px;
  border-radius: var(--r);
  color: var(--text-2);
  font-size: 13.5px;
  cursor: pointer;
  position: relative;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.nav-item:hover { background: var(--surface-2); color: var(--text); }
.nav-item.active {
  background: linear-gradient(90deg, var(--brand-50), transparent);
  color: var(--brand-600);
  font-weight: 600;
}
[data-theme="dark"] .nav-item.active { background: linear-gradient(90deg, rgba(59,99,240,0.18), transparent); color: var(--brand-300); }
.nav-item.active::before {
  content: ''; position: absolute; left: 22px; top: 50%; transform: translateY(-50%);
  width: 6px; height: 6px; border-radius: 50%; background: var(--brand-500);
  box-shadow: 0 0 8px var(--brand-400);
}
.app.collapsed .sidebar__nav { display: none; }

.sidebar__footer {
  padding: 12px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* ---------- Topbar ---------- */
.main { display: flex; flex-direction: column; min-width: 0; }
.topbar {
  height: var(--topbar-h);
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 14px;
  padding: 0 22px;
  background: var(--surface-glass);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.icon-btn {
  width: 38px; height: 38px; flex-shrink: 0;
  border: 1px solid transparent;
  border-radius: var(--r);
  background: transparent;
  color: var(--text-2);
  display: grid; place-items: center;
  transition: all var(--transition);
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); border-color: var(--border); }
.icon-btn svg { width: 19px; height: 19px; }

.breadcrumb { display: flex; align-items: center; gap: 7px; font-size: 13px; color: var(--text-3); min-width: 0; }
.breadcrumb b { color: var(--text); font-size: 15px; font-weight: 700; letter-spacing: -0.3px; }
.breadcrumb .sep { color: var(--border-strong); }

.topbar__spacer { flex: 1; }

.topbar__search {
  display: flex; align-items: center; gap: 8px;
  width: 280px; max-width: 32vw;
  height: 38px; padding: 0 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  color: var(--text-3);
  transition: all var(--transition);
}
.topbar__search:focus-within { border-color: var(--brand-400); box-shadow: 0 0 0 3px var(--brand-50); }
[data-theme="dark"] .topbar__search:focus-within { box-shadow: 0 0 0 3px rgba(59,99,240,0.2); }
.topbar__search input { border: none; background: transparent; outline: none; flex: 1; color: var(--text); }
.topbar__search svg { width: 17px; height: 17px; }

.avatar {
  width: 38px; height: 38px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--brand-500));
  color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 14px;
  cursor: pointer; flex-shrink: 0;
}

/* ---------- Content ---------- */
.content { padding: 24px; flex: 1; max-width: 1640px; width: 100%; margin: 0 auto; }
.page-enter { animation: pageIn 320ms cubic-bezier(0.16, 1, 0.3, 1); }
@keyframes pageIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---------- Mobile ---------- */
.scrim { display: none; }
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; left: 0; top: 0; width: var(--sidebar-w);
    transform: translateX(-100%); transition: transform var(--transition);
    box-shadow: var(--shadow-lg);
  }
  .app.mobile-open .sidebar { transform: none; }
  .app.collapsed { grid-template-columns: 1fr; }
  .app.collapsed .sidebar__nav { display: block; }
  .app.collapsed .sidebar__title { display: flex; }
  .scrim.show { display: block; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 39; }
  .topbar__search { display: none; }
  .content { padding: 16px; }
}