/* ── App shell ── */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--header-height) 1fr;
  grid-template-areas:
    "header header"
    "sidebar main";
  min-height: 100vh;
}

/* ── Header ── */
.app-header {
  grid-area: header;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
}

.app-header .logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-header .logo:hover { text-decoration: none; }

.header-spacer { flex: 1; }

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── Sidebar ── */
.app-sidebar {
  grid-area: sidebar;
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  overflow-y: auto;
  padding: 16px 12px;
  border-right: 1px solid var(--border);
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-section {
  margin-bottom: 8px;
}

.sidebar-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding: 0 8px;
  margin-bottom: 4px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.875rem;
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}

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

.sidebar-link.active {
  background: var(--accent-subtle);
  color: var(--accent);
  font-weight: 500;
}

.sidebar-link .icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.7;
}

.sidebar-link.active .icon { opacity: 1; }

/* ── Main ── */
.app-main {
  grid-area: main;
  padding: 32px;
  overflow-x: hidden;
  max-width: 1000px;
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.page-header h1 { flex: 1; }

/* ── Auth layout (no sidebar) ── */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--bg-secondary);
}

.auth-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-md);
}

.auth-card h1 {
  font-size: 1.375rem;
  margin-bottom: 6px;
}

.auth-card .auth-subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 28px;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "main";
  }
  .app-sidebar { display: none; }
  .app-main { padding: 16px; }
}