/* ==========================================================================
   App shell — topbar, sidebar, main region, and the chrome (public) screens.
   ========================================================================== */

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--ground-0);
  color: var(--fg);
}

/* -------------------------------- Topbar --------------------------------- */

.topbar {
  display: flex;
  align-items: center;
  gap: var(--sp-9);
  height: 58px;
  padding-inline: var(--sp-9);
  background: var(--ground-1);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  min-width: 210px;
}

.topbar__name {
  font-weight: 800;
  font-size: 16px;
  letter-spacing: 0.2px;
  line-height: 1.15;
}

.topbar__tagline {
  font-size: 10.5px;
  font-weight: 500;
  color: var(--fg-mute);
}

.topbar__burger {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-1);
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-control);
  cursor: pointer;
}

.topbar__burger span {
  width: 16px;
  height: 2px;
  background: var(--fg);
  border-radius: 2px;
}

/* -------------------------------- Shell ---------------------------------- */

.shell {
  flex: 1;
  display: flex;
  min-height: 0;
}

.sidebar {
  width: 236px;
  flex-shrink: 0;
  background: var(--ground-1);
  border-inline-end: 1px solid var(--line);
  padding: var(--sp-7) var(--sp-5);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.sidebar__group {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--fg-mute);
  padding: var(--sp-2) var(--sp-4) var(--sp-1);
}

.sidebar__group + .nav-item {
  margin-block-start: 0;
}

.sidebar__group:not(:first-child) {
  padding-block-start: var(--sp-6);
}

.sidebar__note {
  margin-block-start: auto;
  padding: var(--sp-5) var(--sp-4) var(--sp-1);
  font-size: 10px;
  line-height: 1.5;
  color: var(--fg-mute);
  border-top: 1px solid var(--line);
}

.nav-scrim {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 45;
  background: rgba(4, 12, 14, 0.5);
  border: 0;
}

.main {
  flex: 1;
  min-width: 0;
  overflow-y: auto;
  background: var(--ground-0);
}

.screen {
  padding: var(--sp-9) var(--sp-10);
}

.screen--flush {
  padding: 0;
}

/* ------------------------------ Screen head ------------------------------ */

.screen-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-7);
  flex-wrap: wrap;
  margin-block-end: var(--sp-8);
}

.screen-head__title {
  font-size: var(--fs-h1);
  font-weight: 800;
}

.screen-head__sub {
  font-size: 12.5px;
  color: var(--fg-mute);
  margin-block-start: 5px;
}

/* -------------------------------- Grids ---------------------------------- */

.grid {
  display: grid;
  gap: var(--sp-7);
  align-items: start;
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--main-aside { grid-template-columns: 1fr 300px; }
.grid--main-wide { grid-template-columns: 1fr 320px; }
.grid--split { grid-template-columns: 1.4fr 1fr; }

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}

/* -------------------------- Chrome (public) pages ------------------------ */

.chrome {
  min-height: 100vh;
  background: var(--ground-0);
  color: var(--fg);
}

.chrome__controls {
  position: fixed;
  top: var(--sp-7);
  inset-inline-end: var(--sp-7);
  z-index: 40;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

/* ------------------------------ Responsive ------------------------------- */

@media (max-width: 1100px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .topbar {
    height: auto;
    flex-wrap: wrap;
    padding: var(--sp-4) var(--sp-6);
    gap: var(--sp-4);
    position: static;
  }

  .topbar__burger { display: flex; }

  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    inset-inline-start: 0;
    width: 250px;
    z-index: 50;
    transform: translateX(-110%);
    transition: transform var(--dur-base) ease;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.45);
  }

  [dir='rtl'] .sidebar { transform: translateX(110%); }
  .sidebar[data-open='true'] { transform: none; }
  .nav-scrim[data-open='true'] { display: block; }

  .grid--2,
  .grid--3,
  .grid--4,
  .grid--main-aside,
  .grid--main-wide,
  .grid--split {
    grid-template-columns: 1fr;
  }

  .screen { padding: var(--sp-7); }
}