/* ============================================================
   APPLICATION SHELL LAYOUT
   ============================================================ */

.pf-app {
  display: grid;
  grid-template-columns: var(--pf-sidebar-width) 1fr;
  grid-template-rows: var(--pf-topbar-height) 1fr;
  grid-template-areas:
    "sidebar topbar"
    "sidebar main";
  height: 100vh;
  transition: grid-template-columns var(--pf-duration-base) var(--pf-ease);
}

.pf-app[data-sidebar="collapsed"] {
  grid-template-columns: var(--pf-sidebar-width-collapsed) 1fr;
}

/* ---------------- SIDEBAR ---------------- */

.pf-sidebar {
  grid-area: sidebar;
  background: var(--pf-structure-900);
  color: var(--pf-text-inverse);
  display: flex;
  flex-direction: column;
  min-width: 0;
  z-index: var(--pf-z-sidebar);
  border-right: 1px solid var(--pf-structure-border);
}

.pf-sidebar__brand {
  height: var(--pf-topbar-height);
  display: flex;
  align-items: center;
  gap: var(--pf-space-3);
  padding: 0 var(--pf-space-5);
  border-bottom: 1px solid var(--pf-structure-border);
  flex-shrink: 0;
}

.pf-sidebar__brand-mark {
  width: 26px;
  height: 26px;
  border-radius: var(--pf-radius-sm);
  background: var(--pf-action-600);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: var(--pf-fw-bold);
  font-size: var(--pf-fs-sm);
  flex-shrink: 0;
}

.pf-sidebar__brand-name {
  font-weight: var(--pf-fw-semibold);
  font-size: var(--pf-fs-md);
  white-space: nowrap;
  overflow: hidden;
}

.pf-app[data-sidebar="collapsed"] .pf-sidebar__brand-name,
.pf-app[data-sidebar="collapsed"] .pf-nav__label,
.pf-app[data-sidebar="collapsed"] .pf-sidebar__section-title,
.pf-app[data-sidebar="collapsed"] .pf-sidebar__footer-text {
  display: none;
}

.pf-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--pf-space-4) var(--pf-space-3);
}

.pf-nav__section-title {
  font-size: var(--pf-fs-xs);
  font-weight: var(--pf-fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--pf-text-inverse-muted);
  padding: var(--pf-space-2) var(--pf-space-3);
  margin-top: var(--pf-space-2);
}

.pf-nav__item {
  display: flex;
  align-items: center;
  gap: var(--pf-space-3);
  padding: var(--pf-space-2) var(--pf-space-3);
  border-radius: var(--pf-radius-md);
  color: var(--pf-text-inverse-muted);
  font-size: var(--pf-fs-sm);
  font-weight: var(--pf-fw-medium);
  cursor: pointer;
  transition: background var(--pf-duration-fast) var(--pf-ease), color var(--pf-duration-fast) var(--pf-ease);
  margin-bottom: 2px;
  white-space: nowrap;
  position: relative;
}

.pf-nav__item:hover {
  background: var(--pf-structure-700);
  color: var(--pf-text-inverse);
}

.pf-nav__item[aria-current="page"] {
  background: var(--pf-structure-600);
  color: #fff;
}

.pf-nav__item[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--pf-action-600);
}

.pf-nav__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.pf-nav__icon svg { width: 100%; height: 100%; }

.pf-nav__badge {
  margin-left: auto;
  font-size: 11px;
  font-weight: var(--pf-fw-semibold);
  background: var(--pf-status-danger);
  color: #fff;
  border-radius: 10px;
  padding: 1px 6px;
  min-width: 18px;
  text-align: center;
}

.pf-sidebar__footer {
  border-top: 1px solid var(--pf-structure-border);
  padding: var(--pf-space-3);
  flex-shrink: 0;
}

.pf-sidebar__collapse-btn {
  display: flex;
  align-items: center;
  gap: var(--pf-space-3);
  width: 100%;
  padding: var(--pf-space-2) var(--pf-space-3);
  border-radius: var(--pf-radius-md);
  color: var(--pf-text-inverse-muted);
  font-size: var(--pf-fs-sm);
}
.pf-sidebar__collapse-btn:hover {
  background: var(--pf-structure-700);
  color: var(--pf-text-inverse);
}
.pf-sidebar__collapse-btn svg {
  width: 16px; height: 16px;
  transition: transform var(--pf-duration-base) var(--pf-ease);
}
.pf-app[data-sidebar="collapsed"] .pf-sidebar__collapse-btn svg {
  transform: rotate(180deg);
}

/* ---------------- TOP BAR ---------------- */

.pf-topbar {
  grid-area: topbar;
  background: var(--pf-surface);
  border-bottom: 1px solid var(--pf-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--pf-space-6);
  gap: var(--pf-space-5);
  z-index: var(--pf-z-topbar);
  min-width: 0;
}

.pf-topbar__left {
  display: flex;
  align-items: center;
  gap: var(--pf-space-4);
  min-width: 0;
}

.pf-topbar__title {
  font-size: var(--pf-fs-lg);
  font-weight: var(--pf-fw-semibold);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pf-project-selector {
  display: flex;
  align-items: center;
  gap: var(--pf-space-2);
  padding: 6px var(--pf-space-3);
  border: 1px solid var(--pf-border);
  border-radius: var(--pf-radius-md);
  font-size: var(--pf-fs-sm);
  font-weight: var(--pf-fw-medium);
  color: var(--pf-text-primary);
  background: var(--pf-surface);
  max-width: 320px;
  cursor: pointer;
  transition: border-color var(--pf-duration-fast) var(--pf-ease);
}
.pf-project-selector:hover { border-color: var(--pf-border-strong); }
.pf-project-selector__label {
  color: var(--pf-text-tertiary);
  font-weight: var(--pf-fw-regular);
}
.pf-project-selector__value {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.pf-project-selector svg { width: 14px; height: 14px; flex-shrink: 0; color: var(--pf-text-tertiary); }

.pf-topbar__right {
  display: flex;
  align-items: center;
  gap: var(--pf-space-4);
  flex-shrink: 0;
}

.pf-search {
  display: flex;
  align-items: center;
  gap: var(--pf-space-2);
  background: var(--pf-surface-sunken);
  border: 1px solid transparent;
  border-radius: var(--pf-radius-md);
  padding: 7px var(--pf-space-3);
  width: 260px;
  transition: border-color var(--pf-duration-fast) var(--pf-ease), background var(--pf-duration-fast) var(--pf-ease);
}
.pf-search:focus-within {
  border-color: var(--pf-action-600);
  background: var(--pf-surface);
}
.pf-search svg { width: 15px; height: 15px; color: var(--pf-text-tertiary); flex-shrink: 0; }
.pf-search input {
  border: none;
  background: transparent;
  outline: none;
  width: 100%;
  font-size: var(--pf-fs-sm);
}
.pf-search input::placeholder { color: var(--pf-text-tertiary); }

.pf-icon-btn {
  position: relative;
  width: 34px;
  height: 34px;
  border-radius: var(--pf-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--pf-text-secondary);
  transition: background var(--pf-duration-fast) var(--pf-ease);
}
.pf-icon-btn:hover { background: var(--pf-surface-sunken); color: var(--pf-text-primary); }
.pf-icon-btn svg { width: 18px; height: 18px; }

.pf-icon-btn__dot {
  position: absolute;
  top: 7px;
  right: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--pf-status-danger);
  border: 2px solid var(--pf-surface);
}

.pf-user-menu {
  display: flex;
  align-items: center;
  gap: var(--pf-space-2);
  padding: 4px 6px 4px 4px;
  border-radius: var(--pf-radius-md);
  cursor: pointer;
  transition: background var(--pf-duration-fast) var(--pf-ease);
}
.pf-user-menu:hover { background: var(--pf-surface-sunken); }

.pf-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--pf-action-600);
  color: #fff;
  font-size: 12px;
  font-weight: var(--pf-fw-semibold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.pf-user-menu__meta {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.pf-user-menu__name { font-size: var(--pf-fs-sm); font-weight: var(--pf-fw-medium); }
.pf-user-menu__role { font-size: 11px; color: var(--pf-text-tertiary); }

/* ---------------- MAIN CONTENT ---------------- */

.pf-main {
  grid-area: main;
  overflow-y: auto;
  background: var(--pf-bg);
}

.pf-content {
  padding: var(--pf-space-6);
  max-width: 1600px;
  margin: 0 auto;
}

/* ---------------- RESPONSIVE ---------------- */

@media (max-width: 1080px) {
  .pf-app {
    grid-template-columns: var(--pf-sidebar-width-collapsed) 1fr;
  }
  .pf-app .pf-sidebar__brand-name,
  .pf-app .pf-nav__label,
  .pf-app .pf-sidebar__section-title {
    display: none;
  }
  .pf-search { width: 180px; }
}

@media (max-width: 760px) {
  .pf-app {
    grid-template-columns: 0 1fr;
  }
  .pf-sidebar { display: none; }
  .pf-app[data-sidebar="mobile-open"] {
    grid-template-columns: var(--pf-sidebar-width) 1fr;
  }
  .pf-app[data-sidebar="mobile-open"] .pf-sidebar {
    display: flex;
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--pf-sidebar-width);
  }
  .pf-app[data-sidebar="mobile-open"] .pf-sidebar .pf-sidebar__brand-name,
  .pf-app[data-sidebar="mobile-open"] .pf-sidebar .pf-nav__label,
  .pf-app[data-sidebar="mobile-open"] .pf-sidebar .pf-sidebar__section-title {
    display: block;
  }
  .pf-search { display: none; }
  .pf-content { padding: var(--pf-space-4); }
}