/* Layout - Professional structure */

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Login Page Layout */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    background: var(--color-bg-primary);
    padding: var(--spacing-8);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 400px;
    margin: var(--spacing-4);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-6);
}

.login-header h1 {
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-2);
}

.login-header p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.login-footer {
    text-align: center;
    margin-top: var(--spacing-6);
}

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

/* Header */
.app-header {
    grid-area: header;
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-6);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-sticky);
}

.header-left .header-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin: 0;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.user-info {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

/* Sidebar */
.app-sidebar {
    grid-area: sidebar;
    background: var(--color-bg-primary);
    border-right: 1px solid var(--color-border-light);
    overflow-y: auto;
}

.sidebar-nav {
    padding: var(--spacing-4) 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-6);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
    border-right: 3px solid transparent;
}

.nav-item:hover {
    background-color: var(--color-gray-50);
    color: var(--color-text-primary);
}

.nav-item.active {
    background-color: var(--color-primary-light);
    background-opacity: 0.1;
    color: var(--color-primary);
    border-right-color: var(--color-primary);
    font-weight: var(--font-weight-medium);
}

.nav-icon {
    font-size: var(--font-size-base);
    width: 20px;
    text-align: center;
}

.nav-text {
    font-size: var(--font-size-sm);
}

/* Hide admin-only items based on user role */
.nav-item.admin-only {
    display: none;
}

body[data-user-role="admin"] .nav-item.admin-only {
    display: flex;
}

/* Main Content */
.main-content {
    grid-area: main;
    background: var(--color-bg-secondary);
    overflow-y: auto;
    padding: var(--spacing-6);
}

/* Page Loading */
.page-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    color: var(--color-text-muted);
    gap: var(--spacing-4);
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-layout {
        grid-template-areas:
            "header"
            "main";
        grid-template-rows: var(--header-height) 1fr;
        grid-template-columns: 1fr;
    }

    .app-sidebar {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: var(--sidebar-width);
        height: calc(100vh - var(--header-height));
        z-index: var(--z-modal);
        transition: left var(--transition-base);
    }

    .app-sidebar.open {
        left: 0;
    }

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

    .login-container {
        padding: var(--spacing-6);
        margin: var(--spacing-2);
    }
}