/* ToolsOS — app shell layout */

.app {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

/* ---------- Sidebar ---------- */
.sidebar {
  grid-row: 1;
  background: var(--bg-1);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow-y: auto;
  z-index: 40;
}
.sidebar__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-5) var(--sp-5) var(--sp-4);
  border-bottom: 1px solid var(--border-soft);
}
.sidebar .btn.sidebar__close { display: none; margin-left: auto; }
.brand-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(145deg, var(--accent), var(--accent-2));
  color: var(--accent-contrast);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.12);
  flex: 0 0 auto;
}
.brand-mark .icon { width: 22px; height: 22px; stroke-width: 2; }
.brand-name { font-weight: 700; font-size: var(--fs-md); letter-spacing: -0.02em; }
.brand-name b { color: var(--accent); font-weight: 700; }
.brand-sub { font-size: var(--fs-xs); color: var(--text-dim); }

.sidebar__nav {
  padding: var(--sp-4) var(--sp-3);
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
  flex: 1;
}
.nav-group-label {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  padding: var(--sp-4) var(--sp-3) var(--sp-2);
}
.nav-item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: 10px var(--sp-3);
  border-radius: var(--r-sm);
  color: var(--text-muted);
  font-size: var(--fs-base);
  font-weight: 500;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
  position: relative;
}
.nav-item:hover { background: var(--bg-3); color: var(--text); text-decoration: none; }
.nav-item.is-active { background: var(--accent-ghost); color: var(--text); }
.nav-item.is-active::before {
  content: "";
  position: absolute;
  left: -4px; top: 50%;
  transform: translateY(-50%);
  width: 3px; height: 20px;
  border-radius: 999px;
  background: var(--accent);
}
.nav-item__icon { display: grid; place-items: center; color: inherit; }
.nav-item.is-active .nav-item__icon { color: var(--accent); }
.nav-item__label { flex: 1; }
.nav-item__badge {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 7px;
  border-radius: var(--r-pill);
  background: var(--warning-bg);
  color: var(--warning);
}
.nav-item__badge--beta { background: var(--info-bg); color: var(--info); }

.sidebar__footer {
  padding: var(--sp-4);
  border-top: 1px solid var(--border-soft);
  font-size: var(--fs-xs);
  color: var(--text-dim);
}

/* ---------- Main column ---------- */
.main {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: 0 var(--sp-6);
  background: color-mix(in srgb, var(--bg-0) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
/* Higher specificity than `.btn` (components.css loads later) so the
   hamburger stays hidden whenever the persistent sidebar is on screen. */
.topbar .btn.topbar__menu-btn { display: none; }
.topbar__search { flex: 1; max-width: 560px; }
.topbar__spacer { flex: 1; }
.topbar__actions { display: flex; align-items: center; gap: var(--sp-2); }

.content {
  flex: 1;
  width: 100%;
  max-width: var(--content-max);
  margin: 0;
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}

.page-head { display: flex; flex-direction: column; gap: var(--sp-2); }
.page-head__row { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--sp-4); flex-wrap: wrap; }
.page-title { font-size: var(--fs-2xl); }
.page-subtitle { color: var(--text-muted); }

/* Breadcrumbs */
.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  padding: 0;
  font-size: var(--fs-sm);
  color: var(--text-dim);
}
.breadcrumbs li { display: flex; align-items: center; gap: var(--sp-2); }
.breadcrumbs li + li::before { content: "/"; color: var(--border-strong); }
.breadcrumbs a { color: var(--text-muted); }
.breadcrumbs li[aria-current="page"] { color: var(--text); }

/* ---------- Footer (shared partial) ---------- */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  background: var(--bg-1);
}
.site-footer__inner {
  max-width: var(--content-max);
  margin: 0;
  padding: var(--sp-5) var(--sp-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  flex-wrap: wrap;
}
.site-footer__copy { color: var(--text-muted); font-size: var(--fs-sm); }
.site-footer__copy a { color: var(--text); font-weight: 600; }
.site-footer__copy a:hover { color: var(--accent); }
.site-footer__meta { color: var(--text-dim); font-size: var(--fs-xs); display: flex; gap: var(--sp-4); align-items: center; flex-wrap: wrap; }

/* Sidebar backdrop (mobile) */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(2, 4, 10, 0.55);
  z-index: 35;
  backdrop-filter: blur(2px);
}