/* App shell: sidebar, topbar, content, bottom navigation */

.app {
  min-height: 100dvh;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  transition: grid-template-columns var(--dur-slow) var(--ease);
}
body[data-sidebar='collapsed'] .app { grid-template-columns: var(--sidebar-rail) minmax(0, 1fr); }

/* ---------- Sidebar ---------- */
.sidebar {
  position: sticky; top: 0;
  height: 100dvh;
  display: flex; flex-direction: column;
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: var(--sp-4) var(--sp-3) var(--sp-3);
  padding-left: calc(var(--sp-3) + var(--safe-left));
  z-index: 40;
  overflow: hidden;
}

.sidebar__brand {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-2);
  padding: 2px var(--sp-1) var(--sp-4) var(--sp-2);
  min-height: 48px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); min-width: 0; }
.brand:hover { text-decoration: none; }
.brand__mark { width: 34px; height: 34px; flex: none; }
.brand__word {
  font-family: var(--font-display); font-weight: 800; font-size: 20px;
  letter-spacing: -0.03em; color: var(--navy-800); white-space: nowrap;
}
.brand__word span { color: var(--indigo-600); }
[data-theme='dark'] .brand__word { color: #fff; }
[data-theme='dark'] .brand__word span { color: var(--indigo-300); }

.sidebar__school {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface-2);
  margin-bottom: var(--sp-4);
  min-width: 0;
}
.school-badge {
  width: 34px; height: 34px; border-radius: var(--r-sm); flex: none;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--teal-500), var(--teal-700));
  color: #fff; font-family: var(--font-display); font-weight: 800; font-size: 13px;
}
.sidebar__school-name { font-weight: 600; font-size: var(--fs-sm); line-height: 1.25; }
.sidebar__school-meta { font-size: var(--fs-xs); color: var(--text-3); }

.sidebar__nav {
  flex: 1 1 auto;
  overflow-y: auto; overflow-x: hidden;
  margin: 0 calc(var(--sp-2) * -1);
  padding: 0 var(--sp-2);
}
.nav-label {
  font-size: var(--fs-2xs); font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-3); padding: var(--sp-3) 10px var(--sp-2);
  white-space: nowrap;
}
.nav-item {
  position: relative;
  display: flex; align-items: center; gap: 12px;
  height: 40px; padding: 0 10px;
  border-radius: var(--r-sm);
  color: var(--text-2); font-weight: 500;
  white-space: nowrap;
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.nav-item:hover { background: var(--surface-hover); color: var(--text); text-decoration: none; }
.nav-item .icon { color: var(--text-3); transition: color var(--dur-fast) var(--ease); }
.nav-item:hover .icon { color: var(--text-2); }
.nav-item.is-active { background: var(--primary-soft); color: var(--primary-text); font-weight: 600; }
.nav-item.is-active .icon { color: var(--primary); }
.nav-item.is-active::before {
  content: ''; position: absolute; left: -8px; top: 9px; bottom: 9px; width: 3px;
  border-radius: 0 3px 3px 0; background: var(--primary);
}
.nav-item__label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; }
.nav-badge {
  min-width: 20px; height: 20px; padding: 0 6px; border-radius: var(--r-full);
  display: inline-grid; place-items: center;
  background: var(--primary); color: #fff; font-size: 11px; font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.nav-item.is-active .nav-badge { background: var(--primary); }

.sidebar__footer {
  border-top: 1px solid var(--border);
  padding-top: var(--sp-3);
  margin-top: var(--sp-2);
}
.user-chip {
  display: flex; align-items: center; gap: 10px; padding: 8px; border-radius: var(--r-md);
  min-width: 0; width: 100%; text-align: left;
}
.user-chip:hover { background: var(--surface-hover); }
.user-chip__name { font-weight: 600; font-size: var(--fs-sm); line-height: 1.2; }
.user-chip__role { font-size: var(--fs-xs); color: var(--text-3); }

/* Collapsed rail (desktop) */
body[data-sidebar='collapsed'] .sidebar { padding-left: var(--sp-3); padding-right: var(--sp-3); }
body[data-sidebar='collapsed'] .brand__word,
body[data-sidebar='collapsed'] .sidebar__school > :not(.school-badge),
body[data-sidebar='collapsed'] .nav-item__label,
body[data-sidebar='collapsed'] .nav-label,
body[data-sidebar='collapsed'] .user-chip > :not(.avatar) { display: none; }
body[data-sidebar='collapsed'] .sidebar__brand { flex-direction: column; padding-left: 0; padding-right: 0; gap: var(--sp-3); }
body[data-sidebar='collapsed'] .sidebar__school { justify-content: center; padding: 8px 0; border-color: transparent; background: none; }
body[data-sidebar='collapsed'] .nav-item { justify-content: center; padding: 0; }
body[data-sidebar='collapsed'] .sidebar .nav-badge {
  position: absolute; top: 3px; right: 6px; min-width: 16px; height: 16px; font-size: 10px; padding: 0 4px;
}
body[data-sidebar='collapsed'] .nav-label { height: 1px; padding: 0; margin: 10px 8px; background: var(--border); display: block; font-size: 0; }
body[data-sidebar='collapsed'] .user-chip { justify-content: center; }

/* ---------- Main column ---------- */
.main { min-width: 0; display: flex; flex-direction: column; }

.topbar {
  position: sticky; top: 0; z-index: 30;
  height: calc(var(--topbar-h) + var(--safe-top));
  padding: var(--safe-top) calc(var(--sp-8) + var(--safe-right)) 0 var(--sp-8);
  display: flex; align-items: center; gap: var(--sp-4);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  -webkit-backdrop-filter: saturate(1.6) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.topbar.is-scrolled { border-bottom-color: var(--border); background: color-mix(in srgb, var(--surface) 90%, transparent); }
.topbar__title { min-width: 0; display: flex; flex-direction: column; }
.topbar__crumbs { display: flex; align-items: center; gap: 6px; font-size: var(--fs-xs); color: var(--text-3); white-space: nowrap; }
.topbar__crumbs a { color: var(--text-3); }
.topbar__crumbs a:hover { color: var(--text); }
.topbar__heading {
  font-family: var(--font-display); font-weight: 700; font-size: var(--fs-lg);
  letter-spacing: -0.02em; line-height: 1.25;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.topbar__mobile-brand { display: none; }
.topbar__actions { margin-left: auto; display: flex; align-items: center; gap: var(--sp-2); }
.topbar__search { position: relative; width: min(340px, 30vw); }
.topbar .topbar__menu-btn { display: none; }

.content {
  flex: 1;
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--sp-6) calc(var(--sp-8) + var(--safe-right)) var(--sp-12) var(--sp-8);
}
.content:focus { outline: none; }

.view { animation: view-in var(--dur-slow) var(--ease) both; }
@keyframes view-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

/* Page header */
.page-head {
  display: flex; align-items: flex-end; justify-content: space-between; gap: var(--sp-4);
  flex-wrap: wrap;
  margin-bottom: var(--sp-6);
}
.page-head__title { font-size: var(--fs-2xl); letter-spacing: -0.025em; }
.page-head__sub { color: var(--text-3); margin-top: 4px; max-width: 64ch; }
.page-head__actions { display: flex; gap: var(--sp-2); flex-wrap: wrap; }

/* Grids */
.grid { display: grid; gap: var(--sp-5); }
.grid-2 { display: grid; gap: var(--sp-5); grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { display: grid; gap: var(--sp-5); grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { display: grid; gap: var(--sp-4); grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-auto { display: grid; gap: var(--sp-5); grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.split { display: grid; gap: var(--sp-5); grid-template-columns: minmax(0, 1fr) 360px; align-items: start; }
.split--wide { grid-template-columns: minmax(0, 1fr) 400px; }

/* ---------- Bottom navigation (mobile) ---------- */
.bottom-nav {
  display: none;
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 35;
  height: calc(var(--bottomnav-h) + var(--safe-bottom));
  padding: 0 calc(var(--sp-2) + var(--safe-right)) var(--safe-bottom) calc(var(--sp-2) + var(--safe-left));
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  -webkit-backdrop-filter: saturate(1.6) blur(14px);
  border-top: 1px solid var(--border);
}
.bottom-nav__list { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; height: var(--bottomnav-h); }
.bottom-nav__item {
  position: relative;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  color: var(--text-3); font-size: 11px; font-weight: 600;
  min-height: 48px;
  border-radius: var(--r-md);
}
.bottom-nav__item:hover { text-decoration: none; color: var(--text); }
.bottom-nav__item .icon-wrap {
  display: grid; place-items: center; width: 52px; height: 28px; border-radius: var(--r-full);
  transition: background var(--dur) var(--ease);
}
.bottom-nav__item.is-active { color: var(--primary-text); }
.bottom-nav__item.is-active .icon-wrap { background: var(--primary-soft); color: var(--primary); }
.bottom-nav__item:active .icon-wrap { transform: scale(0.94); }
.bottom-nav__dot {
  position: absolute; top: 6px; left: calc(50% + 8px);
  width: 8px; height: 8px; border-radius: 50%; background: var(--error);
  box-shadow: 0 0 0 2px var(--surface);
}

.scrim {
  position: fixed; inset: 0; z-index: 39; background: var(--scrim);
  opacity: 0; pointer-events: none; transition: opacity var(--dur) var(--ease);
}
body.nav-open .scrim { opacity: 1; pointer-events: auto; }

/* ---------- Banners ---------- */
.app-banner {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: 10px var(--sp-8);
  font-size: var(--fs-sm); font-weight: 500;
}
.app-banner--offline { background: var(--navy-800); color: #fff; }
.app-banner--update { background: var(--primary-soft); color: var(--primary-text); }
.app-banner--archive { background: var(--warning-soft); color: var(--warning-text); }
.app-banner .btn { margin-left: auto; }