/* ==========================================================================
   core.css — Design system base + shell layout
   Loaded after bootstrap.min.css. Only overrides / extends what Bootstrap
   does not provide. All custom classes are prefixed with "core-".
   ========================================================================== */

/* ==========================================================================
   SECTION A — CSS Variables (design tokens)
   ========================================================================== */

:root {
  /* Layout dimensions */
  --core-header-height: 52px;
  --core-sidebar-width: 240px;
  --core-sidebar-collapsed-width: 64px;
  --core-content-max-width: 1200px;
  --core-footer-height: 40px;

  /* Spacing scale */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Brand colours — only shell-specific; do not duplicate Bootstrap palette */
  --core-brand-primary: #2563eb;
  --core-sidebar-bg: #ffffff;
  --core-sidebar-active-bg: rgba(37, 99, 235, 0.08);
  --core-sidebar-active-color: #2563eb;
  --core-header-bg: #ffffff;
  --core-header-border: #e5e7eb;
  --core-content-bg: #f8f9fa;
  --core-footer-bg: #ffffff;

  /* Density — normal (default) */
  --density-nav-padding-y: 8px;
  --density-nav-padding-x: 12px;
  --density-nav-font-size: 13px;
  --density-table-cell-padding-y: 8px;
  --density-page-padding-y: 24px;
  --density-page-padding-x: 32px;
  --density-section-gap: 24px;
}

/* Density — compact */
.density-compact {
  --density-nav-padding-y: 5px;
  --density-nav-padding-x: 10px;
  --density-nav-font-size: 12px;
  --density-table-cell-padding-y: 4px;
  --density-page-padding-y: 16px;
  --density-page-padding-x: 24px;
  --density-section-gap: 16px;
  font-size: 13px;
}

/* Density — comfortable */
.density-comfortable {
  --density-nav-padding-y: 11px;
  --density-nav-padding-x: 14px;
  --density-nav-font-size: 14px;
  --density-table-cell-padding-y: 12px;
  --density-page-padding-y: 32px;
  --density-page-padding-x: 40px;
  --density-section-gap: 32px;
}

/* Dark mode — base variable overrides only (no full dark theme yet) */
@media (prefers-color-scheme: dark) {
  :root {
    --core-sidebar-bg: #1e2130;
    --core-sidebar-active-bg: rgba(37, 99, 235, 0.18);
    --core-header-bg: #1e2130;
    --core-header-border: #2d3148;
    --core-content-bg: #151722;
    --core-footer-bg: #1e2130;
  }
}


/* ==========================================================================
   SECTION B — Shell layout
   ========================================================================== */

#core-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Fixed top header */
#core-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--core-header-height);
  background: var(--core-header-bg);
  border-bottom: 1px solid var(--core-header-border);
  z-index: 1000;
  padding: 0 var(--spacing-md);
}

/* Body row: sits below fixed header */
.core-body {
  display: flex;
  flex-direction: row;
  flex: 1;
  padding-top: var(--core-header-height);
}

/* Fixed left sidebar */
#core-sidebar {
  position: fixed;
  top: var(--core-header-height);
  left: 0;
  bottom: 0;
  width: var(--core-sidebar-width);
  background: var(--core-sidebar-bg);
  border-right: 1px solid var(--core-header-border);
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-sm) 0;
  z-index: 900;
  transition: left 0.25s ease, width 0.25s ease;
}

/* Main content area */
#core-main {
  margin-left: var(--core-sidebar-width);
  flex: 1;
  padding: var(--density-page-padding-y) var(--density-page-padding-x);
  min-width: 0;
}

/* Content inner container */
#core-content {
  max-width: var(--core-content-max-width);
}

/* Footer — margin-left matches #core-main so the fixed sidebar doesn't overlap it */
#core-footer {
  background: var(--core-footer-bg);
  border-top: 1px solid var(--core-header-border);
  padding: 8px 20px;
  height: var(--core-footer-height);
  margin-left: var(--core-sidebar-width);
}


/* ==========================================================================
   SECTION C — Header styling
   ========================================================================== */

.core-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--spacing-md);
}

/* Brand / logo area */
.core-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.core-brand-logo {
  max-height: calc(96px * var(--core-logo-scale, 100) / 100);
  width: auto;
  display: block;
}

/* Tenant switcher */
.core-tenant-switcher {
  border: 1px solid var(--core-header-border);
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
  flex-shrink: 0;
  min-width: 0;
  max-width: 220px;
}

.core-tenant-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: inherit;
  max-width: 100%;
}

.core-tenant-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Right-side actions cluster */
.core-header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-shrink: 0;
  margin-left: auto;
}

/* Icon button — square, circular hover */
.core-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
  color: inherit;
  padding: 0;
  transition: background-color 0.15s ease;
}

.core-icon-btn:hover {
  background-color: rgba(0, 0, 0, 0.06);
}

.core-icon-btn:focus-visible {
  outline: 2px solid var(--core-brand-primary);
  outline-offset: 2px;
}

/* Notification badge */
.core-badge {
  position: absolute;
  top: -4px;
  right: -6px;
  background-color: var(--bs-danger, #dc3545);
  color: #fff;
  font-size: 9px;
  font-weight: 600;
  min-width: 14px;
  height: 14px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 3px;
  line-height: 1;
}

/* User menu */
.core-user-menu {
  display: flex;
  align-items: center;
}

.core-user-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  width: auto;
  border-radius: 20px;
  padding: 0 8px;
}

.core-user-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--bs-info, #0dcaf0);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  flex-shrink: 0;
  line-height: 1;
}

.core-user-name {
  font-size: 13px;
  font-weight: 500;
}


/* ==========================================================================
   SECTION D — Sidebar styling
   ========================================================================== */

.core-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  padding: 0 var(--spacing-sm);
}

.core-nav-item {
  margin: 2px 0;
}

.core-nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--density-nav-padding-y) var(--density-nav-padding-x);
  border-radius: 6px;
  color: var(--bs-secondary, #6c757d);
  text-decoration: none;
  font-size: var(--density-nav-font-size);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.core-nav-link:hover {
  background-color: rgba(0, 0, 0, 0.04);
  color: var(--bs-body-color, #212529);
}

.core-nav-link.active {
  background-color: var(--core-sidebar-active-bg);
  color: var(--core-sidebar-active-color);
  font-weight: 500;
}

.core-nav-link.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.core-nav-link .bi {
  font-size: 16px;
  flex-shrink: 0;
  width: 18px;
  text-align: center;
}

.core-nav-divider {
  border: none;
  border-top: 1px solid var(--core-header-border);
  margin: 8px 12px;
}

.core-nav-section-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--bs-secondary, #6c757d);
  padding: 0 var(--density-nav-padding-x);
  margin: var(--spacing-xs) 0 var(--spacing-sm);
  display: block;
}

/* Push bottom links to end of sidebar */
.core-nav-bottom {
  margin-top: auto;
}


/* ---------- Chat-mode sidebar ---------- */

#chat-sidebar-panel {
  display: none;
}

body.chat-mode #core-sidebar .core-nav-list:not(.core-nav-bottom),
body.chat-mode #core-sidebar .core-nav-divider:not(.core-nav-divider--bottom),
body.chat-mode #core-sidebar .core-nav-section-label {
  display: none;
}

body.chat-mode #chat-sidebar-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  padding: 0 var(--spacing-sm);
}

body.chat-mode #chat-sidebar-panel[hidden] {
  display: flex;
}


/* ---------- Module-specific sidebar (registry-driven) ---------- */

/* Container injected by base.html when UI_REGISTRY has a sidebar_template
   for the current module.  The standard nav lists are NOT rendered when
   this panel is active — server-side switch, not CSS toggle. */

.core-module-sidebar-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  padding: 0 var(--spacing-sm);
}

.core-module-sidebar-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-sm) var(--spacing-sm);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary, #212529);
}

.core-module-sidebar-header i {
  font-size: 1.1rem;
}

.core-module-sidebar-back {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm, 4px);
  color: var(--text-secondary, #6c757d);
  text-decoration: none;
  font-size: 0.875rem;
}

.core-module-sidebar-back:hover {
  background-color: var(--surface-hover, #f8f9fa);
  color: var(--text-primary, #212529);
}

.core-module-sidebar-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.core-module-sidebar-list .core-nav-link.disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.core-module-sidebar-divider {
  margin: var(--spacing-sm) 0;
  border: 0;
  border-top: 1px solid var(--border-color, #dee2e6);
}

.core-module-sidebar-section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary, #6c757d);
  padding: var(--spacing-sm) var(--spacing-sm) 4px;
  margin: 0;
}


/* ==========================================================================
   SECTION E — Content area patterns
   ========================================================================== */

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--density-section-gap);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.page-header h1,
.page-header .page-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

/* KPI grid — 3 columns */
.core-kpi-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--density-section-gap);
}

/* Placeholder patterns — minimal styles, detailed theming per-page */
.core-list-view {}
.core-detail-view {}
.core-settings-view {}
.core-form-view {}
.core-wizard-view {}

.core-empty-state {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  color: var(--bs-secondary, #6c757d);
}

.core-empty-state .core-empty-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  opacity: 0.4;
}


/* ==========================================================================
   SECTION F — Footer
   ========================================================================== */

.core-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.core-footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: var(--spacing-lg);
}

.core-footer-links a {
  font-size: 11px;
  color: var(--bs-secondary, #6c757d);
  text-decoration: none;
}

.core-footer-links a:hover {
  color: var(--bs-body-color, #212529);
}

.core-footer-version {
  font-size: 11px;
  color: var(--bs-secondary, #6c757d);
}


/* ==========================================================================
   SECTION G — Auth pages
   ========================================================================== */

.core-auth-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--core-content-bg);
  padding: var(--spacing-lg) var(--spacing-md);
}

.core-auth-wrapper {
  width: 100%;
  max-width: 480px;
  padding: var(--spacing-lg);
}

.core-auth-brand {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.core-auth-brand a {
  display: inline-block;
}


/* ---- Sidebar collapsed state (desktop toggle) ---- */
body.sidebar-collapsed #core-sidebar {
  width: var(--core-sidebar-collapsed-width);
}

body.sidebar-collapsed #core-sidebar .core-nav-link span,
body.sidebar-collapsed #core-sidebar .core-nav-section-label,
body.sidebar-collapsed #core-sidebar .core-tenant-name {
  display: none;
}

body.sidebar-collapsed #core-sidebar .core-nav-link {
  justify-content: center;
  padding: var(--density-nav-padding-y) 0;
}

body.sidebar-collapsed #core-sidebar .core-nav-divider {
  margin: 8px 8px;
}

body.sidebar-collapsed #core-main,
body.sidebar-collapsed #core-footer {
  margin-left: var(--core-sidebar-collapsed-width);
}

body.sidebar-collapsed [data-action="collapse-sidebar"] .bi-chevron-bar-left::before {
  content: "\F285";
}

/* Smooth transition */
#core-sidebar {
  transition: width 0.2s ease;
}

#core-main,
#core-footer {
  transition: margin-left 0.2s ease;
}

/* ==========================================================================
   SECTION H — Responsive breakpoints
   ========================================================================== */

/* ---- Tablet (≤ 991px): sidebar collapses to icon-only 64px ---- */
@media (max-width: 991px) {
  #core-sidebar {
    width: var(--core-sidebar-collapsed-width);
  }

  /* Hide text labels, keep icons */
  #core-sidebar .core-nav-link span,
  #core-sidebar .core-nav-section-label,
  #core-sidebar .core-tenant-name {
    display: none;
  }

  #core-sidebar .core-nav-link {
    justify-content: center;
    padding: var(--density-nav-padding-y) 0;
  }

  #core-sidebar .core-nav-divider {
    margin: 8px 8px;
  }

  #core-main,
  #core-footer {
    margin-left: var(--core-sidebar-collapsed-width);
  }

  /* Hide user name text in header */
  .core-user-name {
    display: none;
  }

  /* Chat-mode: keep sidebar expanded at full width on tablet */
  body.chat-mode #core-sidebar {
    width: var(--core-sidebar-width);
  }

  body.chat-mode #core-sidebar #chat-sidebar-panel span,
  body.chat-mode #core-sidebar .core-nav-bottom .core-nav-link span {
    display: revert;
  }

  body.chat-mode #core-sidebar .core-nav-bottom .core-nav-link {
    justify-content: flex-start;
    padding: var(--density-nav-padding-y) var(--density-nav-padding-x);
  }

  body.chat-mode #core-main,
  body.chat-mode #core-footer {
    margin-left: var(--core-sidebar-width);
  }
}

/* ---- Mobile (≤ 767px): sidebar off-screen, toggled by JS ---- */
@media (max-width: 767px) {
  #core-sidebar {
    width: var(--core-sidebar-width);
    left: calc(-1 * var(--core-sidebar-width));

    /* Restore text labels hidden at tablet breakpoint */
    .core-nav-link span,
    .core-nav-section-label {
      display: revert;
    }

    .core-nav-link {
      justify-content: flex-start;
      padding: var(--density-nav-padding-y) var(--density-nav-padding-x);
    }

    .core-nav-divider {
      margin: 8px 12px;
    }
  }

  /* Sidebar visible when toggled */
  body.core-sidebar-open #core-sidebar {
    left: 0;
  }

  /* Semi-transparent overlay behind open sidebar */
  body.core-sidebar-open::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 850;
  }

  #core-main,
  #core-footer {
    margin-left: 0;
  }

  body.chat-mode #core-main,
  body.chat-mode #core-footer {
    margin-left: 0;
  }

  #core-main {
    padding: var(--spacing-md);
  }

  /* KPI grid: single column on mobile */
  .core-kpi-grid {
    grid-template-columns: 1fr;
  }

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


/* ==========================================================================
   SECTION I — Utility classes
   ========================================================================== */

/* Visible only on desktop (≥ 768px), hidden below */
.d-desktop-only {
  display: revert;
}

@media (max-width: 767px) {
  .d-desktop-only {
    display: none !important;
  }
}

/* Visible only on mobile (< 768px), hidden on desktop */
.d-mobile-only {
  display: none;
}

@media (max-width: 767px) {
  .d-mobile-only {
    display: revert !important;
  }
}