/* ==========================================================================
   DS-G4RGO Environment Inspection — Layout
   CSS Grid layout: sidebar (280px fixed), header (60px), main content, footer
   Responsive: sidebar collapses to hamburger menu below 768px
   ========================================================================== */

/* --------------------------------------------------------------------------
   App shell — CSS Grid
   -------------------------------------------------------------------------- */
.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  grid-template-rows: 60px 1fr auto;
  grid-template-areas:
    "sidebar header"
    "sidebar main"
    "sidebar footer";
  min-height: 100vh;
  width: 100%;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-6);
  height: 60px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  z-index: var(--z-header);
  position: sticky;
  top: 0;
}

.header__left {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.header__right {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.header__title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
}

.header__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 0.75rem;
  color: var(--muted);
}

.header__breadcrumb-sep {
  color: var(--border);
  user-select: none;
}

.header__breadcrumb a {
  color: var(--muted);
}

.header__breadcrumb a:hover {
  color: var(--accent);
}

/* Hamburger toggle — hidden on desktop */
.header__hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  transition: background var(--transition-fast);
}

.header__hamburger:hover {
  background: var(--panel-hover);
}

.header__hamburger-icon,
.header__hamburger-icon::before,
.header__hamburger-icon::after {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  position: relative;
}

.header__hamburger-icon::before,
.header__hamburger-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 18px;
}

.header__hamburger-icon::before {
  top: -6px;
}

.header__hamburger-icon::after {
  top: 6px;
}

/* Hamburger active state (X) */
.header__hamburger.is-active .header__hamburger-icon {
  background: transparent;
}

.header__hamburger.is-active .header__hamburger-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.header__hamburger.is-active .header__hamburger-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* --------------------------------------------------------------------------
   Sidebar
   -------------------------------------------------------------------------- */
.sidebar {
  grid-area: sidebar;
  display: flex;
  flex-direction: column;
  width: 280px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  z-index: var(--z-sidebar);
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  overflow-y: auto;
  overflow-x: hidden;
  transition: transform var(--transition-base);
}

.sidebar__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: 0 var(--sp-5);
  height: 60px;
  min-height: 60px;
  border-bottom: 1px solid var(--border);
}

.sidebar__brand-logo {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.sidebar__brand-name {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.sidebar__brand-version {
  font-size: 0.625rem;
  color: var(--muted);
  margin-left: auto;
  font-family: var(--font-mono);
}

/* Navigation */
.sidebar__nav {
  flex: 1;
  padding: var(--sp-4) 0;
  overflow-y: auto;
}

.sidebar__section {
  margin-bottom: var(--sp-4);
}

.sidebar__section-title {
  padding: var(--sp-2) var(--sp-5);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  user-select: none;
}

.sidebar__link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-5);
  font-size: 0.8125rem;
  color: var(--muted);
  border-left: 2px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast);
}

.sidebar__link:hover {
  background: var(--panel-hover);
  color: var(--text);
}

.sidebar__link.is-active {
  color: var(--accent);
  background: var(--panel-hover);
  border-left-color: var(--accent);
}

.sidebar__link-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.7;
}

.sidebar__link.is-active .sidebar__link-icon {
  opacity: 1;
}

.sidebar__link-badge {
  margin-left: auto;
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--bg);
  line-height: 1.4;
}

/* Sidebar footer area */
.sidebar__footer {
  padding: var(--sp-4) var(--sp-5);
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--muted);
}

/* Overlay for mobile sidebar */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: calc(var(--z-sidebar) - 1);
}

/* --------------------------------------------------------------------------
   Main content area
   -------------------------------------------------------------------------- */
.main {
  grid-area: main;
  padding: var(--sp-6);
  min-width: 0;
  overflow-x: hidden;
}

.main__content {
  max-width: 1400px;
  width: 100%;
}

/* Page header within content */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-6);
  gap: var(--sp-4);
  flex-wrap: wrap;
}

.page-header__title {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--text);
}

.page-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

/* --------------------------------------------------------------------------
   Panels / Cards
   -------------------------------------------------------------------------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: var(--sp-6);
}

.panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-4) var(--sp-5);
  border-bottom: 1px solid var(--border);
}

.panel__title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.panel__body {
  padding: var(--sp-5);
}

.panel__footer {
  padding: var(--sp-4) var(--sp-5);
  border-top: 1px solid var(--border);
}

/* --------------------------------------------------------------------------
   Content grid helpers
   -------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--sp-6);
}

.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

.grid--30-70 {
  grid-template-columns: 30% 70%;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  grid-area: footer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-3) var(--sp-6);
  border-top: 1px solid var(--border);
  font-size: 0.6875rem;
  color: var(--muted);
}

.footer__left,
.footer__right {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

/* --------------------------------------------------------------------------
   Tables
   -------------------------------------------------------------------------- */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table {
  width: 100%;
  font-size: 0.8125rem;
}

.table th,
.table td {
  padding: var(--sp-3) var(--sp-4);
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.table th {
  font-weight: 600;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: var(--panel);
  position: sticky;
  top: 0;
}

.table tbody tr {
  transition: background var(--transition-fast);
}

.table tbody tr:hover {
  background: var(--panel-hover);
}

/* --------------------------------------------------------------------------
   Responsive — below 1200px: tighten grid
   -------------------------------------------------------------------------- */
@media (max-width: 1200px) {
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --------------------------------------------------------------------------
   Responsive — below 992px
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
  .grid--30-70 {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Responsive — below 768px: sidebar collapses
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "main"
      "footer";
  }

  /* Show hamburger */
  .header__hamburger {
    display: flex;
  }

  /* Sidebar becomes an off-canvas drawer */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    transform: translateX(-100%);
    z-index: var(--z-sidebar);
    box-shadow: var(--shadow-lg);
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

  .sidebar-overlay.is-visible {
    display: block;
  }

  /* Adjust main padding */
  .main {
    padding: var(--sp-4);
  }

  /* Stack grids */
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--30-70 {
    grid-template-columns: 1fr;
  }

  /* Page header stacks vertically */
  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Footer stacks */
  .footer {
    flex-direction: column;
    gap: var(--sp-2);
    text-align: center;
  }
}

/* --------------------------------------------------------------------------
   Responsive — below 480px
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .main {
    padding: var(--sp-3);
  }

  .panel__body {
    padding: var(--sp-3);
  }

  .panel__header {
    padding: var(--sp-3) var(--sp-4);
  }

  .header {
    padding: 0 var(--sp-4);
  }
}