.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: var(--z-sidebar);
    transition: transform var(--transition-normal);
}

.sidebar-brand {
    padding: 1.2rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-brand .brand-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--glow-blue);
}

.sidebar-brand .brand-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-bright);
    line-height: 1.2;
}

.sidebar-brand .brand-sub {
    font-size: 0.65rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.sidebar-nav {
    flex: 1;
    padding: 0.75rem 0;
    overflow-y: auto;
}

.nav-section {
    padding: 0.5rem 1rem 0.25rem;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-dim);
    font-weight: 600;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 1rem;
    margin: 2px 0.5rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-item:hover {
    background: rgba(0, 212, 255, 0.05);
    color: var(--text-primary);
}

.nav-item.active {
    background: rgba(0, 102, 255, 0.12);
    color: var(--accent-cyan);
    box-shadow: inset 3px 0 0 var(--accent-cyan);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 60%;
    background: var(--accent-cyan);
    border-radius: 0 2px 2px 0;
    box-shadow: var(--glow-cyan);
}

.nav-item .nav-icon {
    width: 20px;
    text-align: center;
    font-size: 1rem;
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-info:hover {
    background: rgba(0, 212, 255, 0.05);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
    color: white;
}

.user-name {
    font-size: 0.8rem;
    color: var(--text-primary);
}

.user-role {
    font-size: 0.65rem;
    color: var(--text-secondary);
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

.page-header {
    padding: 1.2rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: var(--z-header);
}

.page-header h1 {
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.page-header .header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.page-body {
    padding: 1.5rem 2rem;
}

.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

.dashboard-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(12, 1fr);
    grid-auto-rows: minmax(80px, auto);
}

.col-span-2 { grid-column: span 2; }
.col-span-3 { grid-column: span 3; }
.col-span-4 { grid-column: span 4; }
.col-span-5 { grid-column: span 5; }
.col-span-6 { grid-column: span 6; }
.col-span-8 { grid-column: span 8; }
.col-span-12 { grid-column: span 12; }
.row-span-2 { grid-row: span 2; }
.row-span-3 { grid-row: span 3; }
.row-span-4 { grid-row: span 4; }

.fullscreen-layout {
    margin-left: 0;
    padding: 0;
}

.fullscreen-layout .sidebar { display: none; }

@media (max-width: 1200px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-5 { grid-template-columns: repeat(3, 1fr); }
    .grid-6 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .page-body {
        padding: 1rem;
    }

    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .col-span-2, .col-span-3, .col-span-4,
    .col-span-5, .col-span-6, .col-span-8, .col-span-12 {
        grid-column: span 1;
    }
}