/* ============================================================================
   W.H. Academy — Layout System
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
@media (min-width: 640px) { .container { padding-inline: var(--space-5); } }
@media (min-width: 1024px) { .container { padding-inline: var(--space-6); } }

/* ---- App shell ---- */
.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-main {
  flex: 1;
  width: 100%;
  padding-bottom: calc(var(--space-9) + env(safe-area-inset-bottom, 0px));
}
@media (min-width: 1024px) {
  .app-main { padding-bottom: var(--space-8); }
}

/* ---- Top bar (all breakpoints) ---- */
.top-bar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border);
}
.top-bar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--color-brand-ink);
  letter-spacing: 0.02em;
}
[data-theme="dark"] .top-bar__brand { color: var(--color-interactive); }
.top-bar__actions { display: flex; align-items: center; gap: var(--space-2); }

/* ---- Bottom navigation (mobile-primary, per IA §7 — 5 items) ---- */
.bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: var(--z-sticky);
  display: flex;
  justify-content: space-around;
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.bottom-nav__item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-2) var(--space-1);
  min-height: var(--touch-target-min);
  color: var(--color-text-secondary);
  font: var(--type-caption);
  text-transform: none;
  letter-spacing: normal;
}
.bottom-nav__item svg { width: 22px; height: 22px; stroke: currentColor; fill: none; }
.bottom-nav__item[aria-current="page"] { color: var(--color-brand-ink); font-weight: 700; }
[data-theme="dark"] .bottom-nav__item[aria-current="page"] { color: var(--color-interactive); }

@media (min-width: 1024px) {
  .bottom-nav { display: none; }
}

/* ---- Sidebar (desktop) ---- */
.sidebar { display: none; }
@media (min-width: 1024px) {
  .app-shell--with-sidebar { flex-direction: row; }
  .sidebar {
    display: flex;
    flex-direction: column;
    width: 240px;
    flex-shrink: 0;
    min-height: 100vh;
    position: sticky;
    top: 0;
    border-right: 1px solid var(--color-border);
    background: var(--color-bg-surface);
    padding: var(--space-5) var(--space-4);
    gap: var(--space-6);
  }
  .sidebar__nav { display: flex; flex-direction: column; gap: var(--space-1); }
  .sidebar__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font: var(--type-body-md);
  }
  .sidebar__item svg { width: 20px; height: 20px; stroke: currentColor; fill: none; }
  .sidebar__item:hover { background: var(--neutral-100); }
  [data-theme="dark"] .sidebar__item:hover { background: var(--color-bg-app); }
  .sidebar__item[aria-current="page"] { background: var(--color-brand-ink-tint); color: var(--color-brand-ink); font-weight: 700; }
  [data-theme="dark"] .sidebar__item[aria-current="page"] { background: var(--color-info-surface); color: var(--color-interactive); }
  .app-main--with-sidebar { max-width: calc(var(--container-max) + 240px); margin-inline: auto; }
}

/* ---- Breadcrumb ---- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font: var(--type-body-sm);
  color: var(--color-text-secondary);
  padding: var(--space-3) var(--space-4);
  overflow-x: auto;
}
.breadcrumb__sep { color: var(--color-border-strong); }
.breadcrumb__current { color: var(--color-text-primary); font-weight: 700; }
@media (max-width: 1023px) { .breadcrumb__full { display: none; } }

/* ---- Grids ---- */
.grid { display: grid; gap: var(--space-4); grid-template-columns: repeat(4, 1fr); }
@media (min-width: 640px) { .grid { grid-template-columns: repeat(8, 1fr); gap: var(--space-4); } }
@media (min-width: 1024px) { .grid { grid-template-columns: repeat(12, 1fr); gap: var(--space-5); } }

.card-grid { display: grid; gap: var(--space-4); grid-template-columns: 1fr; }
@media (min-width: 640px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .card-grid { grid-template-columns: repeat(3, 1fr); } }

.stack { display: flex; flex-direction: column; }
.stack > * + * { margin-top: var(--space-4); }
.stack-sm > * + * { margin-top: var(--space-2); }
.stack-lg > * + * { margin-top: var(--space-6); }

.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3); }

.section { padding-block: var(--space-6); }
@media (min-width: 1024px) { .section { padding-block: var(--space-8); } }

.reading-column { max-width: 680px; }

/* ---- Mobile bottom-nav: brand gradient bar (adapts to the chosen theme) --- */
.bottom-nav {
  background: linear-gradient(90deg, var(--brand-primary), var(--brand-primary-mid));
  border-top: none;
  box-shadow: 0 -6px 20px var(--brand-glow, rgba(79, 70, 229, 0.25));
}
.bottom-nav__item { color: rgba(255, 255, 255, 0.82); }
.bottom-nav__item[aria-current="page"] { color: #ffffff; font-weight: 700; }
[data-theme="dark"] .bottom-nav__item[aria-current="page"] { color: #ffffff; }