/* ============================================================
   BILHON OS Design System v2.0 — Layout
   App shell, sidebar rail, sidebar panel, main content,
   page layout, responsive breakpoints.
   Prefix: .bl-
   Author: Homer (Romulo Henricco)
   ============================================================ */

/* ── App Shell ── */

.bl-app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bl-bg-primary);
  color: var(--bl-text-primary);
  font-family: var(--bl-font-sans);
  position: relative;
  overflow-x: hidden;
}

.bl-has-topbar {
  padding-top: var(--bl-topbar-h);
}

/* ── Sidebar Rail ── */

.bl-sidebar-rail {
  position: fixed;
  top: var(--bl-topbar-h);
  left: 0;
  bottom: 0;
  width: var(--bl-sidebar-rail-w);
  background: var(--bl-bg-1);
  border-right: 1px solid var(--bl-border-1);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--bl-space-3) 0;
  gap: var(--bl-space-1);
  z-index: var(--bl-z-sidebar);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.bl-sidebar-rail::-webkit-scrollbar {
  display: none;
}

/* ── Sidebar Rail Items ── */

.bl-sidebar-rail__item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  border-radius: var(--bl-radius-md);
  color: var(--bl-text-dim);
  cursor: pointer;
  transition: color var(--bl-duration-fast) var(--bl-ease),
              background var(--bl-duration-fast) var(--bl-ease);
  text-decoration: none;
  font-size: 13px;
  gap: 3px;
  user-select: none;
}

.bl-sidebar-rail__item:hover {
  color: var(--bl-text-secondary);
  background: rgba(255, 255, 255, 0.04);
}

.bl-sidebar-rail__item--active {
  color: var(--bl-text-primary);
  background: rgba(var(--bl-accent-rgb), 0.08);
}

/* Left accent bar for active state */
.bl-sidebar-rail__item--active::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: rgba(var(--bl-accent-rgb), 0.9);
  border-radius: 0 var(--bl-radius-xs) var(--bl-radius-xs) 0;
  box-shadow: 0 0 8px rgba(var(--bl-accent-rgb), 0.4);
}

.bl-sidebar-rail__item-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.bl-sidebar-rail__item-label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 68px;
  text-align: center;
}

/* ── Sidebar Rail Separator ── */

.bl-sidebar-rail__separator {
  width: 32px;
  height: 1px;
  background: var(--bl-border-1);
  margin: var(--bl-space-2) 0;
  flex-shrink: 0;
}

/* ── Sidebar Panel (sliding overlay) ── */

.bl-sidebar-panel {
  position: fixed;
  top: var(--bl-topbar-h);
  left: var(--bl-sidebar-rail-w);
  bottom: 0;
  width: var(--bl-sidebar-panel-w);
  background: var(--bl-glass-bg-heavy);
  backdrop-filter: blur(var(--bl-glass-blur)) saturate(var(--bl-glass-saturate));
  -webkit-backdrop-filter: blur(var(--bl-glass-blur)) saturate(var(--bl-glass-saturate));
  border-right: 1px solid var(--bl-border-2);
  z-index: calc(var(--bl-z-sidebar) - 1);
  transform: translateX(-100%);
  transition: transform var(--bl-duration-slow) var(--bl-ease),
              opacity var(--bl-duration-slow) var(--bl-ease);
  opacity: 0;
  overflow-y: auto;
  padding: var(--bl-space-4);
}

.bl-sidebar-panel--open {
  transform: translateX(0);
  opacity: 1;
}

.bl-sidebar-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--bl-space-3);
  border-bottom: 1px solid var(--bl-border-1);
  margin-bottom: var(--bl-space-3);
}

.bl-sidebar-panel__title {
  font-size: var(--bl-text-sm);
  font-weight: 600;
  color: var(--bl-text-primary);
  letter-spacing: var(--bl-tracking-wide);
  text-transform: uppercase;
}

.bl-sidebar-panel__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--bl-radius-sm);
  border: none;
  background: transparent;
  color: var(--bl-text-dim);
  cursor: pointer;
  transition: color var(--bl-duration-fast) var(--bl-ease),
              background var(--bl-duration-fast) var(--bl-ease);
}

.bl-sidebar-panel__close:hover {
  color: var(--bl-text-primary);
  background: rgba(255, 255, 255, 0.06);
}

/* ── Main Content ── */

.bl-content {
  margin-left: var(--bl-sidebar-rail-w);
  min-height: calc(100vh - var(--bl-topbar-h));
  padding: var(--bl-space-6);
  flex: 1;
}

/* ── Page Dashboard (legacy layout) ── */

.bl-page-dashboard {
  max-width: 1560px;
  margin: 0 auto;
  padding: 60px 80px;
}

/* ── Content Variants ── */

.bl-content--full {
  max-width: none;
  padding: var(--bl-space-6);
}

.bl-content--centered {
  max-width: var(--bl-content-max-w);
  margin-left: auto;
  margin-right: auto;
  padding: var(--bl-space-6);
}

/* ── Page Header ── */

.bl-page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--bl-space-8);
  gap: var(--bl-space-4);
}

.bl-page-header__left {
  display: flex;
  flex-direction: column;
  gap: var(--bl-space-1);
}

.bl-page-header__title {
  font-size: var(--bl-text-xl);
  font-weight: 700;
  color: var(--bl-text-primary);
  letter-spacing: var(--bl-tracking-tight);
  line-height: var(--bl-leading-tight);
}

.bl-page-header__subtitle {
  font-size: var(--bl-text-sm);
  color: var(--bl-text-secondary);
  line-height: var(--bl-leading-normal);
}

.bl-page-header__breadcrumb {
  font-size: var(--bl-text-xs);
  color: var(--bl-text-dim);
  text-transform: uppercase;
  letter-spacing: var(--bl-tracking-wider);
  font-weight: 500;
  margin-bottom: var(--bl-space-1);
}

.bl-page-header__actions {
  display: flex;
  align-items: center;
  gap: var(--bl-space-2);
  flex-shrink: 0;
}

/* ── Responsive (< 768px) ── */

@media (max-width: 767px) {
  .bl-sidebar-rail {
    display: none;
  }

  .bl-sidebar-panel {
    left: 0;
    width: 100%;
  }

  .bl-content {
    margin-left: 0;
    padding: var(--bl-space-4);
  }

  .bl-page-dashboard {
    padding: 30px 20px;
  }

  .bl-page-header {
    flex-direction: column;
    gap: var(--bl-space-3);
  }

  .bl-page-header__actions {
    width: 100%;
    justify-content: flex-start;
  }
}