/* ==========================================================================
   BASE — reset, typography, layout khung sườn (sidebar + topbar + main)
   ========================================================================== */

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  color: var(--text-primary);
  background: var(--bg-app);
  -webkit-font-smoothing: antialiased;
}
body { overflow: hidden; height: 100vh; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; font-size: inherit; color: inherit; }
ul { margin: 0; padding: 0; list-style: none; }
h1,h2,h3,h4,p { margin: 0; }
svg.lucide { width: 16px; height: 16px; stroke-width: 2; vertical-align: middle; flex-shrink: 0; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ---------------- APP SHELL ---------------- */
.app-shell {
  display: grid;
  grid-template-columns: 232px 1fr;
  grid-template-rows: 56px 1fr;
  grid-template-areas: "sidebar topbar" "sidebar main";
  height: 100vh;
  width: 100vw;
}

.sidebar {
  grid-area: sidebar;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px 12px;
  overflow-y: auto;
}

.topbar {
  grid-area: topbar;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
}

.main-content {
  grid-area: main;
  overflow-y: auto;
  padding: 22px 28px 60px;
  position: relative;
}

.brand {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 8px 18px;
  font-weight: 700; font-size: var(--fs-md);
}
.brand .logo-dot {
  width: 26px; height: 26px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #7C3AED);
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 13px; font-weight: 800;
}

.nav-section-title {
  font-size: var(--fs-xs); font-weight: 600; letter-spacing: .04em;
  color: var(--text-tertiary); text-transform: uppercase;
  padding: 14px 10px 6px;
}

.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: var(--radius-sm);
  color: var(--text-secondary); font-size: var(--fs-base); font-weight: 500;
  transition: background var(--transition), color var(--transition);
  margin-bottom: 2px;
}
.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.nav-item.active { background: var(--accent); color: #fff; }
.nav-item.active svg { stroke: #fff; }
.nav-item .kbd-hint {
  margin-left: auto; font-size: 10px; color: var(--text-tertiary);
  border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px;
}
.nav-item.active .kbd-hint { border-color: rgba(255,255,255,.4); color: rgba(255,255,255,.85); }

.sidebar-footer {
  margin-top: auto; padding-top: 12px; border-top: 1px solid var(--border);
}
.user-chip {
  display: flex; align-items: center; gap: 8px; padding: 8px; border-radius: var(--radius-sm);
  cursor: pointer; transition: background var(--transition);
}
.user-chip:hover { background: var(--bg-hover); }
.user-chip .name { font-size: var(--fs-sm); font-weight: 600; }
.user-chip .role { font-size: var(--fs-xs); color: var(--text-tertiary); }

.avatar {
  width: 30px; height: 30px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 12px; font-weight: 700; flex-shrink: 0;
  background: var(--accent);
}
.avatar.sm { width: 22px; height: 22px; font-size: 10px; }
.avatar.lg { width: 44px; height: 44px; font-size: 16px; }

/* ---------------- TOPBAR CONTENTS ---------------- */
.topbar-title { font-size: var(--fs-md); font-weight: 700; margin-right: auto; white-space: nowrap; }
.topbar-search {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg-surface-2); border: 1px solid transparent;
  border-radius: var(--radius-md); padding: 7px 12px; width: 340px;
  color: var(--text-tertiary); transition: border-color var(--transition);
}
.topbar-search:focus-within { border-color: var(--accent); background: var(--bg-surface); }
.topbar-search input { flex: 1; background: transparent; border: none; outline: none; color: var(--text-primary); font-size: var(--fs-sm); }
.topbar-search .kbd { font-size: 10px; border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px; color: var(--text-tertiary); }

.icon-btn {
  width: 34px; height: 34px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  background: transparent; border: 1px solid transparent; color: var(--text-secondary);
  transition: background var(--transition), color var(--transition); position: relative;
}
.icon-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

.badge-dot {
  position: absolute; top: 4px; right: 4px; width: 8px; height: 8px;
  border-radius: 50%; background: var(--danger); border: 2px solid var(--bg-surface);
}

@media (max-width: 900px) {
  .app-shell { grid-template-columns: 0 1fr; }
  .sidebar { position: fixed; left: -260px; top: 0; bottom: 0; width: 232px; z-index: 60; transition: left var(--transition); box-shadow: var(--shadow-lg); }
  .sidebar.open { left: 0; }
  .topbar-search { width: 200px; }
  .main-content { padding: 16px; }
}