/* ============================================
   DentaCare v4 — Layout
   ============================================ */

.dc-app {
  display: grid;
  grid-template-columns: var(--dc-sidebar-width) 1fr;
  grid-template-rows: var(--dc-topbar-height) 1fr;
  height: 100vh;
  background: var(--dc-bg-app);
}

/* === SIDEBAR === */
.dc-sidebar {
  grid-row: 1 / -1;
  background: var(--dc-bg-sidebar);
  border-right: 1px solid var(--dc-border-subtle);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: var(--dc-z-sidebar);
}

.dc-sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: var(--dc-space-4) var(--dc-space-4);
  border-bottom: 1px solid var(--dc-border-subtle);
  height: var(--dc-topbar-height);
}

.dc-sidebar-logo {
  width: 32px;
  height: 32px;
  background: var(--dc-brand-600);
  border-radius: var(--dc-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dc-text-inverse);
  flex-shrink: 0;
}

.dc-sidebar-brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.dc-sidebar-brand-name {
  font-size: var(--dc-text-md);
  font-weight: var(--dc-weight-semibold);
  color: var(--dc-text-primary);
  line-height: 1.2;
}

.dc-sidebar-brand-sub {
  font-size: var(--dc-text-xs);
  color: var(--dc-text-tertiary);
  line-height: 1.2;
}

.dc-sidebar-nav {
  flex: 1;
  padding: var(--dc-space-3) var(--dc-space-2);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.dc-sidebar-section {
  padding: var(--dc-space-3) var(--dc-space-3) var(--dc-space-1);
  font-size: var(--dc-text-xs);
  font-weight: var(--dc-weight-semibold);
  color: var(--dc-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.dc-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--dc-radius-md);
  font-size: var(--dc-text-base);
  font-weight: var(--dc-weight-medium);
  color: var(--dc-text-secondary);
  cursor: pointer;
  transition: background var(--dc-transition-fast), color var(--dc-transition-fast);
  user-select: none;
}

.dc-nav-item:hover {
  background: var(--dc-bg-hover);
  color: var(--dc-text-primary);
}

.dc-nav-item.is-active {
  background: var(--dc-bg-active);
  color: var(--dc-brand-700);
}

.dc-nav-item.is-active .dc-nav-icon {
  color: var(--dc-brand-600);
}

.dc-nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--dc-text-tertiary);
  transition: color var(--dc-transition-fast);
}

.dc-nav-item:hover .dc-nav-icon {
  color: var(--dc-text-secondary);
}

.dc-nav-label {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dc-nav-badge {
  margin-left: auto;
  flex-shrink: 0;
}

.dc-sidebar-footer {
  padding: var(--dc-space-3);
  border-top: 1px solid var(--dc-border-subtle);
}

.dc-user-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: var(--dc-radius-md);
  cursor: pointer;
  transition: background var(--dc-transition-fast);
}

.dc-user-card:hover {
  background: var(--dc-bg-hover);
}

.dc-user-info {
  flex: 1;
  min-width: 0;
}

.dc-user-name {
  font-size: var(--dc-text-base);
  font-weight: var(--dc-weight-medium);
  color: var(--dc-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dc-user-role {
  font-size: var(--dc-text-xs);
  color: var(--dc-text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* === TOPBAR === */
.dc-topbar {
  grid-column: 2;
  background: var(--dc-bg-surface);
  border-bottom: 1px solid var(--dc-border-subtle);
  display: flex;
  align-items: center;
  padding: 0 var(--dc-space-5);
  gap: var(--dc-space-4);
  z-index: var(--dc-z-topbar);
}

.dc-topbar-title {
  font-size: var(--dc-text-lg);
  font-weight: var(--dc-weight-semibold);
  color: var(--dc-text-primary);
}

.dc-topbar-search {
  flex: 1;
  max-width: 400px;
  position: relative;
}

.dc-topbar-search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--dc-text-tertiary);
  pointer-events: none;
}

.dc-topbar-search input {
  width: 100%;
  padding: 7px 12px 7px 32px;
  font-size: var(--dc-text-base);
  background: var(--dc-bg-muted);
  border: 1px solid transparent;
  border-radius: var(--dc-radius-md);
  transition: background var(--dc-transition-fast), border-color var(--dc-transition-fast);
}

.dc-topbar-search input:hover {
  background: var(--dc-bg-hover);
}

.dc-topbar-search input:focus {
  outline: none;
  background: var(--dc-bg-surface);
  border-color: var(--dc-border-focus);
  box-shadow: var(--dc-focus-ring);
}

.dc-topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--dc-space-3);
}

.dc-topbar-status {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-size: var(--dc-text-sm);
  color: var(--dc-text-secondary);
  background: var(--dc-bg-muted);
  border-radius: var(--dc-radius-full);
}

.dc-topbar-time {
  font-size: var(--dc-text-sm);
  color: var(--dc-text-secondary);
  font-variant-numeric: tabular-nums;
}

.dc-topbar-iconbtn {
  width: 34px;
  height: 34px;
  border-radius: var(--dc-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dc-text-secondary);
  background: transparent;
  border: none;
  cursor: pointer;
  position: relative;
  transition: background var(--dc-transition-fast), color var(--dc-transition-fast);
}

.dc-topbar-iconbtn:hover {
  background: var(--dc-bg-hover);
  color: var(--dc-text-primary);
}

.dc-topbar-iconbtn-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  background: var(--dc-danger-500);
  border-radius: 50%;
  border: 2px solid var(--dc-bg-surface);
}

/* === MAIN CONTENT === */
.dc-main {
  grid-column: 2;
  grid-row: 2;
  overflow-y: auto;
  padding: var(--dc-space-5) var(--dc-space-6);
}

.dc-page-header {
  margin-bottom: var(--dc-space-5);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--dc-space-4);
  flex-wrap: wrap;
}

.dc-page-title {
  font-size: var(--dc-text-2xl);
  font-weight: var(--dc-weight-semibold);
  color: var(--dc-text-primary);
  line-height: 1.2;
}

.dc-page-subtitle {
  font-size: var(--dc-text-md);
  color: var(--dc-text-secondary);
  margin-top: 4px;
}

.dc-page-actions {
  display: flex;
  align-items: center;
  gap: var(--dc-space-2);
}

/* Responsive (1024px breakpoint) */
@media (max-width: 1024px) {
  .dc-app {
    grid-template-columns: 64px 1fr;
  }
  .dc-sidebar-brand-text,
  .dc-nav-label,
  .dc-nav-badge,
  .dc-user-info,
  .dc-sidebar-section {
    display: none;
  }
  .dc-nav-item {
    justify-content: center;
    padding: 10px;
  }
  .dc-sidebar-brand {
    justify-content: center;
    padding: var(--dc-space-3);
  }
  .dc-user-card {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .dc-app {
    grid-template-columns: 1fr;
    grid-template-rows: var(--dc-topbar-height) 1fr;
  }
  .dc-sidebar {
    display: none;
  }
  .dc-topbar {
    grid-column: 1;
  }
  .dc-main {
    grid-column: 1;
    padding: var(--dc-space-4);
  }
}