/* ====== App Shell ====== */
.app { display: flex; min-height: 100vh; overflow: hidden; }

/* ====== Sidebar ====== */
.sidebar {
  width: var(--sidebar-width); min-width: var(--sidebar-width); max-width: var(--sidebar-width);
  background: var(--color-sidebar); display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh;
  z-index: 100; transition: transform var(--transition-normal);
  overflow-y: auto; overflow-x: hidden;
}
.sidebar__brand {
  display: flex; align-items: center; gap: 8px;
  padding: 20px var(--space-lg); color: white;
  font-size: 15px; font-weight: 700;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.sidebar__brand-logo {
  width: 32px; height: 32px; border-radius: var(--radius-md);
  background: var(--color-primary); display: flex;
  align-items: center; justify-content: center;
  font-size: 16px; flex-shrink: 0;
}
.sidebar__nav { flex: 1; overflow-y: auto; padding: var(--space-sm); }
.sidebar__section {
  font-size: 10px; color: rgba(255,255,255,0.3);
  text-transform: uppercase; letter-spacing: 0.1em;
  padding: 16px 12px 4px; margin-top: 4px;
}
.sidebar__user {
  padding: 14px var(--space-lg); border-top: 1px solid rgba(255,255,255,0.08);
  display: flex; align-items: center; gap: 8px;
}

.nav-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px; border-radius: var(--radius-md);
  color: var(--color-sidebar-text); font-size: var(--font-size-base);
  cursor: pointer; transition: all var(--transition-fast);
  margin-bottom: 1px; text-decoration: none;
}
.nav-item:hover { background: rgba(255,255,255,0.08); color: white; text-decoration: none; }
.nav-item--active { background: var(--color-sidebar-active); color: white; }
.nav-item__icon { width: 20px; height: 20px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.nav-item__icon svg { width: 20px; height: 20px; }

.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 99; }
.sidebar-overlay--visible { display: block; }

/* ====== Main Content ====== */
.main {
  flex: 1; min-width: 0; overflow-x: hidden; overflow-y: auto;
  display: flex; flex-direction: column;
}

.hamburger {
  display: none; width: 36px; height: 36px; border: none; background: transparent;
  cursor: pointer; padding: 6px; font-size: 22px; line-height: 1;
  align-items: center; justify-content: center;
  color: var(--color-text-primary); border-radius: var(--radius-sm);
}
.hamburger:hover { background: var(--color-surface-hover); }

/* ====== Topbar ====== */
.topbar {
  height: var(--topbar-height); display: flex; align-items: center;
  justify-content: space-between; padding: 0 var(--space-xl);
  background: var(--color-surface); border-bottom: 1px solid var(--color-border);
  position: sticky; top: 0; z-index: 50; flex-shrink: 0;
}
.topbar__left { display: flex; align-items: center; gap: 14px; min-width: 0; }
.topbar__title { font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar__center { display: flex; align-items: center; gap: var(--space-md); }
.topbar__right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.topbar__date-range {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 12px; border: 1px solid var(--color-border);
  border-radius: var(--radius-md); font-size: var(--font-size-sm);
  color: var(--color-text-secondary); cursor: pointer;
  background: var(--color-surface); transition: border-color var(--transition-fast);
}
.topbar__date-range:hover { border-color: var(--color-border-focus); }
.topbar__user-btn {
  display: flex; align-items: center; gap: 6px; padding: 4px 8px;
  border: none; background: transparent; border-radius: var(--radius-md);
  color: var(--color-text-primary); font-size: var(--font-size-sm);
  cursor: pointer; transition: background var(--transition-fast);
}
.topbar__user-btn:hover { background: var(--color-surface-hover); }
.topbar__avatar {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--color-primary); color: white;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: var(--font-weight-semibold);
}

/* ====== Content Area ====== */
.content { padding: var(--space-xl); max-width: 1440px; margin: 0 auto; width: 100%; min-width: 0; }

.chart-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); margin-bottom: var(--space-lg); min-width: 0; }
.chart-grid > * { min-width: 0; overflow: hidden; }

/* ====== Login Page ====== */
.login-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--color-bg);
}
.login-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-xl); box-shadow: var(--shadow-lg);
  padding: 48px; width: 420px; max-width: 92vw;
}
.login-card__title { font-size: 24px; font-weight: 700; text-align: center; margin-bottom: 4px; }
.login-card__subtitle { font-size: var(--font-size-md); color: var(--color-text-secondary); text-align: center; margin-bottom: 32px; }

/* ====== Responsive ====== */
@media (min-width: 1280px) {
  .sidebar { transform: translateX(0) !important; }
  .sidebar-overlay { display: none !important; }
  .metric-grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 1279px) {
  .sidebar { position: fixed; transform: translateX(-100%); }
  .sidebar--open { transform: translateX(0); box-shadow: var(--shadow-xl); }
  .sidebar-overlay--visible { display: block; }
  .chart-grid { grid-template-columns: 1fr; }
  .content { padding: var(--space-md); }
  .hamburger { display: inline-flex; }
  .topbar { padding: 0 var(--space-md); }
  /* auto-fit keeps 3-card layouts from orphan-singleton; 4-card KPIs become 2+2 naturally */
  .metric-grid { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
}

@media (max-width: 1023px) {
  .filter-bar { flex-direction: column; align-items: stretch; }
  .table-toolbar { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 767px) {
  .metric-grid { grid-template-columns: 1fr; }
  .brandhub-quick-actions { grid-template-columns: 1fr !important; }
  .topbar { padding: 0 var(--space-sm); }
  .content { padding: var(--space-sm); }
  .topbar__title { font-size: var(--font-size-md); max-width: 180px; }
  .login-card { width: 100%; padding: 32px 24px; }
  .topbar__date-range { display: none; }
}