/* Modern Layout Structure */
body {
    background-color: var(--color-bg-body);
    color: var(--color-text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden; /* Prevent window scroll */
}

.app-shell {
    display: grid;
    grid-template-columns: 250px 1fr;
    grid-template-rows: auto 1fr;
    height: 100vh; /* Force full height */
    overflow: hidden; /* Contain children */
    transition: grid-template-columns var(--transition-normal);
}

.app-shell.collapsed {
    grid-template-columns: 60px 1fr;
}

.app-shell.app-shell--no-sidebar {
    grid-template-columns: 1fr;
}

.app-shell.app-shell--no-sidebar .app-sidebar {
    display: none;
}

.app-shell.app-shell--no-sidebar .app-main {
    grid-column: 1 / -1;
}

/* Header / Navbar */
.app-header {
    grid-column: 1 / -1;
    /* Visual styles handled by navbar-modern */
    display: flex;
    align-items: center;
    padding: 0; /* Remove padding to let navbar fill */
    z-index: 1000;
    overflow: visible;
    width: 100%;
}

.app-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Sidebar */
.app-sidebar {
    grid-row: 2;
    background-color: var(--color-bg-surface);
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
    padding: var(--spacing-md) 0;
}

/* Sidebar navigation items - scoped to avoid navbar conflicts */
.app-sidebar .nav-item {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-muted);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.app-sidebar .nav-item:hover {
    background-color: var(--color-bg-surface-alt);
    color: var(--color-primary);
}

.app-sidebar .nav-item.active {
    background-color: var(--color-primary-alpha);
    color: var(--color-primary);
    border-left-color: var(--color-primary);
}

/* Main Content */
.app-main {
    grid-column: 2;
    grid-row: 2;
    padding: 0; /* Remove padding from main container to allow full-width footer */
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    overflow-x: hidden; /* Prevent horizontal scroll */
}

.content-container {
    max-width: 90%;
    margin: 0 auto;
    width: 100%;
    padding: var(--spacing-lg);
    flex: 1; /* Pushes footer to bottom */
    display: flex;
    flex-direction: column;
}

/* Cards */
.card {
    background-color: var(--color-bg-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

/* Buttons */
.btn-primary {
    background-color: var(--color-primary);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
}

/* Footer */
.app-footer {
    margin-top: auto;
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    background-color: var(--color-bg-surface);
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.app-footer i {
    font-size: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .app-shell {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto 1fr;
    }
    
    .app-sidebar {
        grid-row: 2;
        grid-column: 1;
        display: none; /* Or implement a mobile menu toggle */
    }
    
    .app-sidebar.mobile-open {
        display: block;
    }

    .app-main {
        grid-row: 3;
        grid-column: 1;
    }
}