/* App Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

/* Sidebar */
.app-sidebar {
    display: flex;
    flex-direction: column;
    width: 240px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 64px;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.logo {
    height: 32px;
    width: auto;
}

/* Sidebar Navigation */
.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}

.nav-item {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background-color 0.2s, color 0.2s;
}

.nav-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-item.active {
    color: var(--accent);
    background: var(--nav-active-bg);
    border-right: 3px solid var(--accent);
}

/* Navigation Group (Submenu with details/summary) */
.nav-group {
    margin-top: 0.5rem;
}

.nav-group-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    list-style: none;
    transition: background-color 0.2s, color 0.2s;
}

.nav-group-label::-webkit-details-marker {
    display: none;
}

.nav-group-label::after {
    content: "▶";
    display: inline-block;
    margin-left: 0.5rem;
    font-size: 0.625rem;
    transition: transform 0.2s;
}

.nav-group[open] > .nav-group-label::after {
    transform: rotate(90deg);
}

.nav-group-label:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.nav-subitem {
    padding-left: 2.5rem;
}

/* Sidebar Footer */
.sidebar-footer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    border-top: 1px solid var(--border);
}

/* Main Content */
.app-content {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
}

.app-content h1 {
    margin: 0 0 1.5rem;
}

/* Buttons */
.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-logout {
    flex: 1;
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.btn-logout:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-logout:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Required field indicator */
.required {
    color: var(--danger-color, #dc3545);
}