/* ==========================================================================
   HTMS App Shell — Sidebar, Header, Layout Grid
   ========================================================================== */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
  transition: grid-template-columns var(--dur-base) var(--ease);
}
.app-shell.sidebar-collapsed {
  grid-template-columns: var(--sidebar-w-collapsed) 1fr;
}

/* ==========================================================================
   SIDEBAR
   ========================================================================== */
.sidebar {
  background: linear-gradient(180deg, var(--navy-900) 0%, var(--navy-950) 100%);
  color: var(--navy-text);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: var(--shadow-navy);
  overflow: hidden;
  transition: width var(--dur-base) var(--ease);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 var(--sp-5);
  height: var(--header-h);
  border-bottom: 1px solid var(--navy-border);
  flex-shrink: 0;
}
.sidebar-brand .brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(145deg, var(--accent-400), var(--accent-700));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(0,0,0,0.35);
}
.sidebar-brand .brand-text {
  overflow: hidden;
  white-space: nowrap;
  transition: opacity var(--dur-fast) var(--ease), width var(--dur-base) var(--ease);
}
.sidebar-brand .brand-title {
  font-family: var(--font-display);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--navy-text-bright);
  letter-spacing: 0.01em;
  line-height: 1.2;
}
.sidebar-brand .brand-sub {
  font-size: 10.5px;
  color: var(--navy-text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 1px;
}

.app-shell.sidebar-collapsed .sidebar-brand .brand-text,
.app-shell.sidebar-collapsed .nav-label,
.app-shell.sidebar-collapsed .nav-section-label,
.app-shell.sidebar-collapsed .sidebar-user .user-text,
.app-shell.sidebar-collapsed .sidebar-footer-collapse span {
  opacity: 0;
  width: 0;
  pointer-events: none;
}
.app-shell.sidebar-collapsed .sidebar-brand { justify-content: center; padding: 0; }
.app-shell.sidebar-collapsed .sidebar-nav a,
.app-shell.sidebar-collapsed .sidebar-nav button.nav-link { justify-content: center; padding: 10px; }
.app-shell.sidebar-collapsed .nav-item-badge { display: none; }
.app-shell.sidebar-collapsed .sidebar-user { justify-content: center; padding: var(--sp-3); }
.app-shell.sidebar-collapsed .sidebar-footer-collapse { justify-content: center; }

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-4) var(--sp-3);
}
.nav-section + .nav-section { margin-top: var(--sp-5); }
.nav-section-label {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--navy-text-dim);
  padding: 0 var(--sp-3);
  margin-bottom: var(--sp-2);
  white-space: nowrap;
  transition: opacity var(--dur-fast) var(--ease);
}

.sidebar-nav a, .sidebar-nav button.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--navy-text);
  font-size: 13.5px;
  font-weight: 500;
  margin-bottom: 2px;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
  position: relative;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
}
.sidebar-nav a i, .sidebar-nav button.nav-link i {
  font-size: 15px;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
  color: var(--navy-text-dim);
  transition: color var(--dur-fast) var(--ease);
}
.sidebar-nav a:hover, .sidebar-nav button.nav-link:hover {
  background: rgba(255,255,255,0.06);
  color: var(--navy-text-bright);
}
.sidebar-nav a:hover i, .sidebar-nav button.nav-link:hover i { color: var(--accent-400); }

.sidebar-nav a.active {
  background: linear-gradient(90deg, rgba(74,126,196,0.22), rgba(74,126,196,0.06));
  color: var(--navy-text-bright);
  font-weight: 600;
}
.sidebar-nav a.active i { color: #6ba3e8; }
.sidebar-nav a.active::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 6px; bottom: 6px;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--accent-400);
}

.nav-label { flex: 1; white-space: nowrap; overflow: hidden; }
.nav-item-badge {
  font-size: 10.5px;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.1);
  color: var(--navy-text-bright);
  white-space: nowrap;
}
.nav-item-badge.count-new { background: var(--emerald-500); color: #fff; }

.sidebar-divider {
  height: 1px;
  background: var(--navy-border);
  margin: var(--sp-4) var(--sp-2);
}

.sidebar-footer {
  border-top: 1px solid var(--navy-border);
  padding: var(--sp-3);
  flex-shrink: 0;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: var(--sp-2) var(--sp-2);
  border-radius: var(--radius-md);
  transition: background var(--dur-fast) var(--ease);
  cursor: pointer;
}
.sidebar-user:hover { background: rgba(255,255,255,0.06); }
.sidebar-user .avatar-circle {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent-500), var(--navy-700));
  display: flex; align-items: center; justify-content: center;
  font-size: 12.5px; font-weight: 700; color: #fff;
  flex-shrink: 0;
  border: 1.5px solid rgba(255,255,255,0.15);
}
.sidebar-user .user-text { overflow: hidden; white-space: nowrap; flex: 1; }
.sidebar-user .user-name { font-size: 13px; font-weight: 600; color: var(--navy-text-bright); }
.sidebar-user .user-role { font-size: 11px; color: var(--navy-text-dim); margin-top: 1px; }

.sidebar-footer-collapse {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  margin-top: var(--sp-2);
  padding: 8px 10px;
  border-radius: var(--radius-md);
  color: var(--navy-text-dim);
  font-size: 12.5px;
  font-weight: 600;
  background: transparent;
  border: 1px solid var(--navy-border);
  transition: all var(--dur-fast) var(--ease);
}
.sidebar-footer-collapse:hover { background: rgba(255,255,255,0.06); color: var(--navy-text-bright); }
.sidebar-footer-collapse i { transition: transform var(--dur-base) var(--ease); }
.app-shell.sidebar-collapsed .sidebar-footer-collapse i { transform: rotate(180deg); }

/* Mobile sidebar overlay */
.sidebar-overlay {
  position: fixed; inset: 0;
  background: rgba(10,15,26,0.5);
  z-index: 39;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease);
}
.sidebar-overlay.open { opacity: 1; pointer-events: auto; }

/* ==========================================================================
   MAIN COLUMN + HEADER
   ========================================================================== */
.main-col {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-width: 0;
}

.app-header {
  height: var(--header-h);
  background: var(--surface-card);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-6);
  gap: var(--sp-4);
  position: sticky;
  top: 0;
  z-index: 30;
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  min-width: 0;
}

.sidebar-toggle-btn, .mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: var(--surface-card);
  color: var(--text-secondary);
  flex-shrink: 0;
  transition: all var(--dur-fast) var(--ease);
}
.sidebar-toggle-btn:hover, .mobile-menu-btn:hover { background: var(--surface-hover); color: var(--text-primary); }
.mobile-menu-btn { display: none; }

.breadcrumb-block { min-width: 0; }
.breadcrumb-trail {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  color: var(--text-tertiary);
  font-weight: 500;
  margin-bottom: 2px;
}
.breadcrumb-trail i { font-size: 8px; color: var(--border-strong); }
.page-title-header {
  font-size: 16.5px;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-search {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface-muted);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  width: 320px;
  color: var(--text-tertiary);
  transition: all var(--dur-fast) var(--ease);
  cursor: pointer;
}
.header-search:hover { border-color: var(--border-strong); background: var(--surface-card); }
.header-search i.fa-magnifying-glass { font-size: 13px; }
.header-search span.search-placeholder { font-size: 13px; flex: 1; }
.kbd-hint {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  background: var(--surface-card);
  border: 1px solid var(--border-default);
  border-radius: 5px;
  padding: 2px 6px;
  font-family: monospace;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
}

.header-filter-group { display: flex; align-items: center; gap: var(--sp-2); }

.icon-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  border: 1px solid transparent;
  transition: all var(--dur-fast) var(--ease);
}
.icon-btn:hover { background: var(--surface-hover); border-color: var(--border-subtle); color: var(--text-primary); }
.icon-btn .dot-badge {
  position: absolute;
  top: 6px; right: 7px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--red-500);
  border: 1.5px solid var(--surface-card);
}

.header-divider {
  width: 1px;
  height: 26px;
  background: var(--border-subtle);
}

.header-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 8px 4px 4px;
  border-radius: var(--radius-md);
  transition: background var(--dur-fast) var(--ease);
}
.header-user:hover { background: var(--surface-hover); }
.header-user .avatar-circle {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent-500), var(--accent-ink));
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: #fff;
  flex-shrink: 0;
}
.header-user .user-meta { display: none; }
@media (min-width: 1220px) {
  .header-user .user-meta { display: block; }
}
.header-user .user-name-sm { font-size: 12.5px; font-weight: 600; color: var(--text-primary); line-height: 1.3; }
.header-user .user-role-sm { font-size: 11px; color: var(--text-tertiary); line-height: 1.3; }
.header-user i.fa-chevron-down { font-size: 10px; color: var(--text-tertiary); margin-left: 2px; }

/* ==========================================================================
   MAIN CONTENT AREA
   ========================================================================== */
.main-content {
  flex: 1;
  padding: var(--sp-6);
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1180px) {
  .header-search { width: 220px; }
}

@media (max-width: 1024px) {
  .app-shell, .app-shell.sidebar-collapsed {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: fixed;
    left: 0; top: 0;
    width: var(--sidebar-w);
    transform: translateX(-100%);
    transition: transform var(--dur-base) var(--ease);
  }
  .app-shell.mobile-nav-open .sidebar {
    transform: translateX(0);
  }
  .sidebar-toggle-btn { display: none; }
  .mobile-menu-btn { display: flex; }
  .header-search { width: 180px; }
  .header-search span.search-placeholder { display: none; }
  .kbd-hint { display: none; }
}

@media (max-width: 860px) {
  .header-filter-group { display: none; }
  .header-search { width: 40px; padding: 8px; justify-content: center; }
}

@media (max-width: 640px) {
  .app-header { padding: 0 var(--sp-4); gap: var(--sp-2); }
  .main-content { padding: var(--sp-4); }
  .breadcrumb-trail { display: none; }
  .header-divider { display: none; }
}

/* ==========================================================================
   ENTERPRISE SHELL REFINEMENT — visual-only, shared-safe
   ========================================================================== */
.sidebar {
  background: linear-gradient(180deg, var(--navy-900) 0%, var(--navy-950) 72%, #07101f 100%);
  box-shadow: 12px 0 30px rgba(7, 16, 31, 0.12), var(--shadow-navy);
}
.sidebar-brand {
  padding-inline: 20px;
  border-bottom-color: rgba(148, 181, 220, 0.16);
}
.sidebar-brand .brand-mark {
  box-shadow: 0 0 0 4px rgba(93, 155, 226, 0.08), 0 6px 14px rgba(0, 0, 0, 0.28);
}
.sidebar-nav { padding: 18px 12px; }
.nav-section + .nav-section { margin-top: 22px; }
.nav-section-label { color: rgba(193, 211, 235, 0.52); font-size: 10px; letter-spacing: 0.12em; }
.sidebar-nav a, .sidebar-nav button.nav-link {
  min-height: 40px;
  border: 1px solid transparent;
  color: rgba(226, 237, 251, 0.78);
}
.sidebar-nav a:hover, .sidebar-nav button.nav-link:hover {
  background: rgba(118, 169, 224, 0.10);
  border-color: rgba(139, 183, 230, 0.10);
}
.sidebar-nav a.active {
  background: linear-gradient(90deg, rgba(83, 143, 211, 0.28), rgba(83, 143, 211, 0.08));
  border-color: rgba(132, 184, 239, 0.16);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}
.sidebar-nav a.active::before { left: -12px; width: 3px; box-shadow: 0 0 12px rgba(108, 169, 235, 0.72); }
.sidebar-user { padding: 9px 10px; border: 1px solid transparent; }
.sidebar-user:hover { background: rgba(118, 169, 224, 0.10); border-color: rgba(139, 183, 230, 0.10); }
.sidebar-footer { border-top-color: rgba(148, 181, 220, 0.16); padding: 12px; }
.sidebar-footer-collapse { border-color: rgba(148, 181, 220, 0.16); }

.app-header {
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 1px 0 rgba(16, 35, 63, 0.02), 0 8px 24px rgba(16, 35, 63, 0.04);
  backdrop-filter: blur(14px);
}
.header-left { gap: 14px; }
.sidebar-toggle-btn, .mobile-menu-btn {
  border-color: var(--border-subtle);
  box-shadow: 0 2px 6px rgba(16, 35, 63, 0.04);
}
.sidebar-toggle-btn:hover, .mobile-menu-btn:hover { border-color: var(--accent-300); box-shadow: 0 4px 12px rgba(49, 105, 174, 0.12); }
.breadcrumb-trail { letter-spacing: 0.02em; }
.page-title-header { letter-spacing: -0.01em; }
.header-search { box-shadow: inset 0 1px 0 rgba(255,255,255,0.7); }
.header-search:focus-within { border-color: var(--accent-300); box-shadow: 0 0 0 3px rgba(62, 125, 194, 0.10); }
.header-user { border: 1px solid transparent; }
.header-user:hover { border-color: var(--border-subtle); box-shadow: 0 4px 12px rgba(16, 35, 63, 0.06); }
.icon-btn:focus-visible, .sidebar-toggle-btn:focus-visible, .mobile-menu-btn:focus-visible,
.sidebar-nav a:focus-visible, .sidebar-nav button.nav-link:focus-visible { outline: 3px solid rgba(75, 137, 204, 0.28); outline-offset: 2px; }
.main-content { padding-top: 26px; }

/* Shared module header refinement; module-specific CSS may override safely. */
.page-hero {
  align-items: flex-start;
  gap: 24px;
  padding: 2px 0 22px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--border-subtle);
}
.page-hero-text { min-width: 0; }
.page-hero .eyebrow { display: inline-flex; align-items: center; gap: 7px; margin-bottom: 8px; color: var(--accent-700); letter-spacing: 0.12em; }
.page-hero .eyebrow i { font-size: 11px; }
.page-hero h1 { letter-spacing: -0.035em; }
.page-hero .hero-support { max-width: 760px; color: var(--text-secondary); }
.page-hero-actions { flex-shrink: 0; padding-top: 22px; }
.page-hero-actions .btn { box-shadow: 0 4px 12px rgba(16, 35, 63, 0.08); }

@media (max-width: 1024px) {
  .main-content { padding-top: 22px; }
  .sidebar { box-shadow: 14px 0 34px rgba(7, 16, 31, 0.24); }
  .page-hero { gap: 16px; }
}

@media (max-width: 640px) {
  .main-content { padding-top: 18px; }
  .page-hero { gap: 14px; padding-bottom: 16px; margin-bottom: 16px; }
  .page-hero-actions { width: 100%; padding-top: 0; }
  .page-hero-actions .btn { width: 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  .sidebar, .app-shell, .sidebar-overlay, .sidebar-brand .brand-text,
  .sidebar-nav a, .sidebar-nav button.nav-link, .header-search, .header-user { transition: none; }
}