/* ===================================
   Layout Styles - Liquid Glass
   Mobile-First Responsive Design
   =================================== */

.page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Sidebar - Glass Effect */
.sidebar {
    width: 280px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-md)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--blur-md)) saturate(180%);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    overflow-y: auto;
    z-index: 1020;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.sidebar-header {
    padding: var(--spacing-xl) var(--spacing-lg);
    border-bottom: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.5);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.sidebar-logo:hover {
    color: var(--color-primary);
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-lg) 0;
    overflow-y: auto;
}

.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.5);
}

/* Main Content */
main {
    flex: 1;
    margin-left: 280px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.content {
    flex: 1;
    padding: var(--spacing-xl);
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

/* Page Header */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--glass-border);
    gap: var(--spacing-md);
}

.page-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin: 0;
    color: var(--color-text-primary);
}

.page-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(4px);
    z-index: 1010;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-xl);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--blur-md));
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
}

.empty-state-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.empty-state-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(var(--blur-lg));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1050;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(0, 122, 255, 0.2);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}

/* ===================================
   RESPONSIVE BREAKPOINTS
   =================================== */

/* Mobile (max-width: 768px) */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: none;
    }
    
    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-xl);
    }
    
    .sidebar-overlay.open {
        display: block;
    }
    
    main {
        margin-left: 0;
    }
    
    .content {
        padding: var(--spacing-md);
        padding-top: 80px;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: var(--spacing-md);
        padding-bottom: var(--spacing-sm);
    }
    
    .page-title {
        font-size: var(--font-size-xl);
    }
    
    .page-actions {
        display: none;
    }
    
    .empty-state {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .empty-state-title {
        font-size: var(--font-size-lg);
    }
}

/* Tablet (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }
    
    main {
        margin-left: 240px;
    }
    
    .content {
        padding: var(--spacing-lg);
    }
}