/* ============================================================
   LAYOUT — esqueleto da página: sidebar, topbar, filtros e grades
   ============================================================ */
.app { display: flex; min-height: 100vh; }

/* ---------- Sidebar ---------- */
.sidebar {
  width: var(--sidebar-w);
  height: 100vh;
  position: sticky;
  top: 0;
  flex-shrink: 0;
  background: var(--bg-1);
  border-right: 1px solid var(--border-s);
  display: flex;
  flex-direction: column;
  transition: width 0.3s var(--ease-out), transform 0.3s var(--ease-out);
  z-index: 100;
}
.sidebar.collapsed { width: var(--sidebar-w-collapsed); }

.sidebar-header { padding: 24px; display: flex; flex-direction: column; gap: 16px; overflow: hidden; }
.logo-text { font-family: var(--font-head); font-size: 1.35rem; color: var(--heading); white-space: nowrap; }
.logo-short { display: none; }
.sidebar.collapsed .logo-full { display: none; }
.sidebar.collapsed .logo-short { display: inline; }
.sidebar.collapsed .sidebar-header { padding: 24px 0; align-items: center; }

.collapse-btn {
  background: none; border: none; color: var(--muted); cursor: pointer;
  display: flex; align-items: center; gap: 8px; padding: 4px 0;
  font-size: 0.8rem; width: max-content; transition: color 0.2s;
}
.collapse-btn:hover { color: var(--heading); }
.collapse-btn i { transition: transform 0.3s; }
.sidebar.collapsed .collapse-btn i { transform: rotate(180deg); }
.sidebar.collapsed .collapse-btn span { display: none; }

.sidebar-nav { flex: 1; display: flex; flex-direction: column; gap: 4px; padding: 0 12px; }

.nav-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; color: var(--muted);
  background: none; border: none; border-radius: 6px; cursor: pointer;
  text-align: left; white-space: nowrap; position: relative; transition: all 0.2s;
}
.nav-item i { width: 16px; text-align: center; font-size: 1rem; }
.nav-item:hover { color: var(--heading); background: var(--glass); }
.nav-item.active { background: rgba(20, 184, 166, 0.08); color: var(--accent-light); }
.nav-item.active::before {
  content: ""; position: absolute; left: -12px; top: 10%; height: 80%; width: 2px;
  background: var(--accent); border-radius: 0 4px 4px 0;
}
.sidebar.collapsed .nav-item { justify-content: center; padding: 10px 0; }
.sidebar.collapsed .nav-item span { display: none; }
.sidebar.collapsed .nav-item.active::before { left: 0; }

.nav-tip {
  position: absolute; left: 100%; top: 50%; transform: translate(8px, -50%);
  background: var(--bg-2); color: var(--heading); border: 1px solid var(--border-s);
  padding: 6px 12px; border-radius: 4px; font-size: 0.8rem;
  opacity: 0; pointer-events: none; transition: opacity 0.2s; white-space: nowrap; z-index: 200;
}
.sidebar.collapsed .nav-item:hover .nav-tip { opacity: 1; }
.sidebar:not(.collapsed) .nav-tip { display: none; }

.sidebar-footer {
  padding: 20px 24px; border-top: 1px solid var(--border-s);
  display: flex; align-items: center; gap: 12px; overflow: hidden;
}
.file-icon {
  width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 0.8rem;
}
.file-info { display: flex; flex-direction: column; min-width: 0; }
.file-name { font-size: 0.8rem; color: var(--heading); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-date { font-size: 0.72rem; color: var(--accent); }
.sidebar.collapsed .sidebar-footer { padding: 20px 0; justify-content: center; }
.sidebar.collapsed .file-info { display: none; }

.backdrop { display: none; }

/* ---------- Área principal ---------- */
.content { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  min-height: 80px; padding: 16px 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  border-bottom: 1px solid var(--border-s);
  background: rgba(6, 6, 16, 0.85); backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 90;
}
.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar h1 { font-size: 1.5rem; }
.topbar-right { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.topbar .menu-btn { display: none; }

.filters {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
  padding: 16px 32px 0;
}

.dashboard { padding: 16px 32px 32px; display: flex; flex-direction: column; gap: var(--gap); }

/* ---------- Grades ---------- */
.row-grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--gap); }
.row-split-2-1 { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: var(--gap); }
.row-split-1-1 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gap); }

/* ---------- Responsivo ---------- */
@media (max-width: 1200px) {
  .row-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .row-split-2-1 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 768px) {
  .sidebar, .sidebar.collapsed {
    position: fixed; left: 0; top: 0; width: var(--sidebar-w);
    transform: translateX(-100%);
  }
  .sidebar.collapsed .logo-full, .sidebar.collapsed .nav-item span { display: inline; }
  .sidebar.collapsed .file-info { display: flex; }
  .sidebar.collapsed .sidebar-header { padding: 24px; align-items: flex-start; }
  .sidebar.collapsed .sidebar-footer { padding: 20px 24px; justify-content: flex-start; }
  .sidebar.collapsed .logo-short { display: none; }
  .sidebar.collapsed .nav-item { justify-content: flex-start; padding: 10px 12px; }
  .sidebar.open { transform: translateX(0); }
  .collapse-btn { display: none; }
  .backdrop.show { display: block; position: fixed; inset: 0; background: rgba(0, 0, 0, 0.55); z-index: 95; }

  .topbar .menu-btn { display: inline-flex; }
  .topbar { padding: 12px 16px; min-height: 64px; }
  .topbar h1 { font-size: 1.2rem; }
  .filters { padding: 12px 16px 0; }
  .dashboard { padding: 12px 16px 24px; }
  .row-split-1-1 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 480px) {
  .row-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
}