/* ── Layout variables ── */
:root {
  --header-height: 48px;
  --sidebar-width: 220px;
  --sidebar-collapsed-width: 56px;
  --sidebar-bg: #1e2330;
  --sidebar-active: #2e3650;
  --header-bg: #111827;
  --transition: 0.22s ease;
}

/* ── Header ── */
.epica-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--header-bg);
  z-index: 1000;
}

.epica-header__brand {
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

/* ── Shell ── */
.epica-layout {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

/* ── Sidebar ── */
.epica-sidebar {
  position: fixed;
  top: var(--header-height);
  bottom: 0;
  left: 0;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  overflow-x: hidden;
  overflow-y: auto;
  transition: width var(--transition);
  z-index: 900;
}

.epica-sidebar .nav-link {
  color: rgba(255, 255, 255, 0.72);
  padding: 0.6rem 1rem;
  white-space: nowrap;
  display: flex;
  align-items: center;
  font-size: 0.875rem;
  border-radius: 0;
  transition: background var(--transition), color var(--transition);
}

.epica-sidebar .nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.epica-sidebar .nav-link.active {
  color: #fff;
  background: var(--sidebar-active);
}

.epica-sidebar .nav-label {
  opacity: 1;
  transition: opacity var(--transition);
}

/* ── Main content ── */
.epica-main {
  margin-left: var(--sidebar-width);
  flex: 1;
  transition: margin-left var(--transition);
  min-height: 100%;
}

/* ── Collapsed state ── */
body.sidebar-collapsed .epica-sidebar {
  width: var(--sidebar-collapsed-width);
}

body.sidebar-collapsed .epica-sidebar .nav-label {
  opacity: 0;
  pointer-events: none;
}

body.sidebar-collapsed .epica-main {
  margin-left: var(--sidebar-collapsed-width);
}

/* ── Login page ── */
.epica-login-bg {
  background: #f1f3f7;
}