/* ============================================================
   LAYOUT — Sidebar, Header, Content Grid
   ============================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background: var(--color-bg-page);
  -webkit-font-smoothing: antialiased;
}

/* ── App Shell ── */
#app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ── Login Shell (full-screen) ── */
#app.login-mode {
  display: block;
}
#app.login-mode #sidebar,
#app.login-mode #header {
  display: none;
}
#app.login-mode #main {
  height: 100vh;
}
#app.login-mode #content {
  padding: 0;
  overflow: auto;
}

/* ── Sidebar ── */
#sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--color-bg-sidebar);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: relative;
  z-index: 200;
  transition: width var(--transition-slow), min-width var(--transition-slow);
  overflow: hidden;
}

#sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
  min-width: var(--sidebar-collapsed-width);
}

/* ── Nav ── */
.sidebar-nav {
  flex: 1;
  padding: var(--space-4) 0;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-nav::-webkit-scrollbar {
  width: 4px;
}
.sidebar-nav::-webkit-scrollbar-track {
  background: transparent;
}
.sidebar-nav::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.15);
  border-radius: var(--radius-full);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  margin: 2px var(--space-2);
  border-radius: var(--radius-lg);
  color: var(--color-text-sidebar);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition-base), color var(--transition-base);
  white-space: nowrap;
  overflow: hidden;
  position: relative;
  border: none;
  background: none;
  width: calc(100% - var(--space-4));
  font-size: var(--font-size-base);
  font-family: var(--font-family);
}

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

.nav-item.active {
  background: var(--color-bg-sidebar-active);
  color: var(--color-text-inverse);
}

.nav-item.active .nav-icon {
  color: var(--color-accent);
}

/* Sub-item — indented, smaller, visually subordinate */
.nav-item-sub {
  padding-left: calc(var(--space-3) + 20px + var(--space-3) + var(--space-2));
  font-size: var(--font-size-xs);
  opacity: 0.8;
}
.nav-item-sub .nav-icon {
  width: 16px;
  height: 16px;
}
.nav-item-sub.active { opacity: 1; }

/* Chevron for collapsible groups */
.nav-chevron {
  margin-left: auto;
  display: flex;
  align-items: center;
  opacity: 0.5;
  transition: transform 200ms ease, opacity 200ms;
  flex-shrink: 0;
}
.nav-chevron.open {
  transform: rotate(180deg);
  opacity: 0.8;
}
.nav-item:hover .nav-chevron { opacity: 0.8; }

.nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-icon svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.nav-label {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  transition: opacity var(--transition-slow);
}

#sidebar.collapsed .nav-label {
  opacity: 0;
  width: 0;
  overflow: hidden;
}

.nav-badge {
  margin-left: auto;
  background: var(--color-accent);
  color: white;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  min-width: 18px;
  text-align: center;
  transition: opacity var(--transition-slow);
}

#sidebar.collapsed .nav-badge {
  opacity: 0;
}

.sidebar-footer {
  padding: var(--space-3) var(--space-2);
  border-top: 1px solid rgba(255,255,255,0.08);
  flex-shrink: 0;
}

.sidebar-collapse-btn {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: none;
  background: none;
  color: var(--color-text-sidebar);
  cursor: pointer;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-family: var(--font-family);
  transition: background var(--transition-base), color var(--transition-base);
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-collapse-btn:hover {
  background: var(--color-bg-sidebar-hover);
  color: var(--color-text-inverse);
}

.sidebar-collapse-btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform var(--transition-slow);
}

#sidebar.collapsed .sidebar-collapse-btn svg {
  transform: rotate(180deg);
}

.sidebar-collapse-btn span {
  transition: opacity var(--transition-slow);
}

#sidebar.collapsed .sidebar-collapse-btn span {
  opacity: 0;
  width: 0;
  overflow: hidden;
}

/* ── Main Area ── */
#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: 100vh;
  overflow: hidden;
}

/* ── Header ── */
#header {
  height: var(--header-height);
  background: var(--color-bg-content);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  gap: var(--space-4);
  flex-shrink: 0;
  z-index: 100;
}

/* ── Header Logo ── */
.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
  margin-left: var(--space-1);
}

.header-logo-img {
  height: 45px;
  width: auto;
  display: block;
}

.header-logo-sub {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  letter-spacing: 0.4px;
  text-transform: uppercase;
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-3);
  line-height: 1.3;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .header-logo-sub {
    display: none;
  }
  .logout-label {
    display: none;
  }
  .header-logout-btn {
    padding: var(--space-2);
    border-color: transparent;
  }
}

/* Hidden on desktop, shown via media query on mobile */
.header-menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--color-text-secondary);
  border-radius: var(--radius-lg);
  transition: background var(--transition-base);
  flex-shrink: 0;
}

.header-menu-btn:hover {
  background: var(--color-bg-panel);
  color: var(--color-text-primary);
}

.header-menu-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}


.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-icon-btn {
  position: relative;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--color-text-secondary);
  border-radius: var(--radius-lg);
  transition: background var(--transition-base), color var(--transition-base);
}

.header-icon-btn:hover {
  background: var(--color-bg-panel);
  color: var(--color-text-primary);
}

.header-icon-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.header-notif-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  border: 2px solid white;
}

.header-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-primary-dark);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

.header-user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-lg);
  border: none;
  background: none;
  font-family: var(--font-family);
  transition: background var(--transition-base);
}

.header-user:hover {
  background: var(--color-bg-panel);
}

.header-user-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
}

.header-username {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  line-height: 1.2;
}

.header-company {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  line-height: 1.2;
}

.header-user-caret {
  opacity: 0.4;
  flex-shrink: 0;
  transition: transform 200ms ease;
}

.header-user[aria-expanded="true"] .header-user-caret {
  transform: rotate(180deg);
}

/* Avatar dropdown */
.header-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--color-bg-content);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  min-width: 180px;
  z-index: 200;
  padding: var(--space-1) 0;
}

.header-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: none;
  background: none;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  cursor: pointer;
  text-align: left;
  transition: background var(--transition-base);
}

.header-dropdown-item:hover {
  background: var(--color-bg-panel);
}

.header-dropdown-item-muted {
  color: var(--color-text-secondary);
}

.header-dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-1) 0;
}

.header-logout-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  background: none;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-family: var(--font-family);
  cursor: pointer;
  transition: all var(--transition-base);
}

.header-logout-btn:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-panel);
  color: var(--color-text-primary);
}

/* ── Content Area ── */
#content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-6);
  background: var(--color-bg-page);
}

#content::-webkit-scrollbar {
  width: 6px;
}
#content::-webkit-scrollbar-track {
  background: transparent;
}
#content::-webkit-scrollbar-thumb {
  background: var(--color-border-hover);
  border-radius: var(--radius-full);
}

.view-container {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

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

.page-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.page-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-top: 2px;
}

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

/* ── Toast Container ── */
#toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  #sidebar {
    width: var(--sidebar-collapsed-width);
    min-width: var(--sidebar-collapsed-width);
  }
  #sidebar .nav-label,
  #sidebar .nav-badge,
  #sidebar .sidebar-collapse-btn span {
    opacity: 0;
    width: 0;
    overflow: hidden;
  }
  #sidebar .sidebar-collapse-btn svg {
    transform: rotate(180deg);
  }
}

/* ── Mobile Sidebar Drawer ── */
#sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 199;
  backdrop-filter: blur(2px);
  animation: fadeIn var(--transition-base);
}

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

.sidebar-mobile-close {
  display: none;
}

@media (max-width: 768px) {
  #app {
    flex-direction: column;
  }

  /* Sidebar becomes fixed off-canvas drawer */
  #sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--sidebar-width) !important;
    min-width: var(--sidebar-width) !important;
    z-index: 300;
    transform: translateX(-100%);
    transition: transform var(--transition-slow);
    /* Override tablet icon-only collapse */
  }

  #sidebar .nav-label,
  #sidebar .nav-badge,
  #sidebar .sidebar-collapse-btn span {
    opacity: 1 !important;
    width: auto !important;
    overflow: visible !important;
  }

  #sidebar .sidebar-collapse-btn svg {
    transform: none !important;
  }

  /* Open state */
  #sidebar.mobile-open {
    transform: translateX(0);
  }

  /* Hide the collapse toggle — not relevant on mobile */
  .sidebar-footer {
    display: none;
  }

  /* Show close button inside sidebar on mobile */
  .sidebar-mobile-close {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    flex-shrink: 0;
  }

  .sidebar-mobile-close button {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    color: rgba(255,255,255,0.7);
    cursor: pointer;
  }

  .sidebar-mobile-close button svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  /* Show hamburger in header */
  .header-menu-btn {
    display: flex !important;
  }

  #content {
    padding: var(--space-4);
  }
  #header {
    padding: 0 var(--space-4);
  }
  .header-username,
  .header-company,
  .header-user-caret {
    display: none;
  }
  #toast-container {
    bottom: var(--space-4);
    right: var(--space-4);
    left: var(--space-4);
  }
}