/* ===========================================================
   layout.css — app shell: sidebar, topbar, mobile bottom nav
   PRD section 56: Desktop sidebar / Mobile bottom nav + "More"
   =========================================================== */

.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ---------- Sidebar (desktop) ---------- */

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
}

.sidebar__brand {
  padding: 14px 14px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar__brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.sidebar__brand-link:hover {
  text-decoration: none;
}

.sidebar__brand-logo {
  width: 54px;
  height: 54px;
  object-fit: contain;
  flex: 0 0 54px;
}

.sidebar__brand-text {
  min-width: 0;
}

.sidebar__brand-name {
  font-weight: 700;
  font-size: 15px;
}

.sidebar__brand-sub {
  font-size: 11px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

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

.sidebar__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-weight: 500;
  margin-bottom: 2px;
}

.sidebar__link:hover {
  background: var(--color-bg);
  text-decoration: none;
}

.sidebar__link.is-active {
  background: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.sidebar__link-icon {
  width: 18px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar__group-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  padding: var(--space-4) 12px var(--space-1);
}

/* ---------- Main area ---------- */

.main {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar__title {
  font-weight: 600;
  font-size: 16px;
}

.topbar__menu-btn {
  display: none;
}

.content {
  padding: var(--space-5);
  flex: 1;
  padding-bottom: calc(var(--bottomnav-height) + var(--space-5));
}

/* ---------- Mobile bottom nav ---------- */

.bottom-nav {
  display: none;
}

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

@media (max-width: 880px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    z-index: 40;
    box-shadow: var(--shadow-md);
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

  .main {
    margin-left: 0;
  }

  .topbar__menu-btn {
    display: inline-flex;
  }

  .content {
    padding: var(--space-4);
  }

  .bottom-nav {
    display: flex;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: var(--bottomnav-height);
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    z-index: 30;
  }

  .bottom-nav__item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    font-size: 11px;
    color: var(--color-text-muted);
  }

  .bottom-nav__item.is-active {
    color: var(--color-primary);
  }

  .bottom-nav__item-icon {
    font-size: 18px;
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 20, 25, 0.4);
    z-index: 35;
  }

  .sidebar-overlay.is-open {
    display: block;
  }
}

/* ---------- Grid helpers ---------- */

.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--summary {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.grid--two {
  grid-template-columns: 1fr 1fr;
}

@media (max-width: 720px) {
  .grid--two {
    grid-template-columns: 1fr;
  }
}