.app-container {
    display: grid;
    grid-template-columns: 80px 1fr;
    grid-template-rows: 64px 1fr;
    height: 100dvh;
    overflow: hidden;
    background-color: var(--color-bg);
}

/* Sidebar */
.sidebar {
    grid-column: 1;
    grid-row: 1 / 3;
    background-color: var(--color-surface);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    z-index: 20;
    transition: width var(--transition-normal);
}

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

.logo {
    font-size: 1.1rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    display: flex;
    align-items: center;
}
.logo span {
    display: none; /* Hide 'Control' in slim mode */
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-4) 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-2);
}

.nav-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
    position: relative;
}
.nav-item .icon {
    display: flex;
}

.nav-item span:not(.icon) {
    display: none; /* Hide text in slim mode */
}

.nav-item:hover {
    color: var(--color-text);
    background-color: var(--color-surface-soft);
}

.nav-item.active {
    color: var(--color-primary);
    background-color: rgba(239, 68, 68, 0.1);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: -16px;
    top: 12px;
    bottom: 12px;
    width: 3px;
    background-color: var(--color-primary);
    border-radius: 0 4px 4px 0;
}

.sidebar-footer {
    padding: var(--spacing-4) 0;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-4);
}

.game-selector-sidebar {
    display: none; /* Hide in slim mode, move to topbar or footer icon */
}

.user-profile {
    display: flex;
    justify-content: center;
    align-items: center;
}
.user-profile .avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background-color: var(--color-surface-bright);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
}
.user-profile .info {
    display: none;
}

/* Topbar */
.topbar {
    grid-column: 2;
    grid-row: 1;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-6);
    z-index: 10;
}

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

.logo-text {
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-primary); /* 'Grid' takes accent color */
    margin-left: 0;
    text-transform: uppercase;
}

.logo-text span {
    color: var(--color-text); /* 'Control' takes main text color */
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.mobile-only {
    display: none !important;
}

/* Main Content */
.main-content {
    grid-column: 2;
    grid-row: 2;
    overflow-y: auto;
    padding: var(--spacing-6);
    background-color: var(--color-bg);
}


/* Responsive Mobile */
@media (max-width: 768px) {
    .app-container {
        grid-template-columns: 1fr;
        grid-template-rows: 60px 1fr 65px;
    }
    
    .sidebar {
        display: flex;
        position: fixed;
        top: 0;
        left: 0;
        height: 100dvh; /* Use dynamic viewport height */
        width: 250px;
        max-width: 80%;
        z-index: 100;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        box-shadow: var(--shadow-md);
    }
    
    .sidebar .nav-item.active::before {
        left: 0;
        top: 8px;
        bottom: 8px;
        width: 4px;
        border-radius: 0 4px 4px 0;
    }
    .sidebar-footer {
        /* Add extra padding for mobile browser navigation bars and safe areas */
        padding-bottom: calc(var(--spacing-4) + env(safe-area-inset-bottom, 20px));
    }
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar .sidebar-nav {
        align-items: stretch;
        padding: var(--spacing-4);
    }
    
    .sidebar .nav-item {
        width: 100%;
        justify-content: flex-start;
        gap: var(--spacing-4);
        padding: 0 var(--spacing-4);
    }
    
    .sidebar .nav-item span:not(.icon) {
        display: block !important;
        font-size: 0.9rem;
        font-weight: 500;
    }
    
    .sidebar .sidebar-header {
        justify-content: flex-start;
        padding-left: var(--spacing-6);
    }
    
    .sidebar .user-profile {
        width: 100%;
        justify-content: flex-start;
        padding-left: var(--spacing-6);
    }
    
    .sidebar .user-info {
        display: flex !important;
    }
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 90;
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-normal), visibility var(--transition-normal);
    }
    .sidebar-overlay.open {
        opacity: 1;
        visibility: visible;
    }
    
    .topbar {
        grid-column: 1;
        grid-row: 1;
        justify-content: space-between;
        padding: 0 var(--spacing-4);
    }
    
    .topbar-left {
        display: flex;
        align-items: center;
        gap: var(--spacing-3);
    }
    
    .logo-mobile {
        font-size: 1.1rem;
        font-weight: 700;
        display: flex;
    }
    .logo-mobile span { color: var(--color-primary); font-weight: 400; }
    
    .mobile-only { display: flex !important; }
    .desktop-only { display: none !important; }
    
    .main-content {
        grid-column: 1;
        grid-row: 2;
        padding: var(--spacing-4);
        padding-bottom: var(--spacing-8);
    }
    
    .bottom-nav {
        grid-column: 1;
        grid-row: 3;
        background-color: var(--color-surface);
        border-top: 1px solid var(--color-border);
        display: flex;
        justify-content: space-around;
        align-items: center;
        z-index: 20;
    }
    
    .bottom-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        color: var(--color-text-muted);
        font-size: 0.7rem;
        gap: 4px;
        padding: var(--spacing-2);
        flex: 1;
        text-align: center;
        transition: color var(--transition-fast);
    }
    
    .bottom-nav-item.active {
        color: var(--color-primary);
    }

    /* Grid Stacking */
    .responsive-grid {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-4) !important;
    }
    .responsive-grid > [class*="grid-span-"] {
        grid-column: span 12 !important;
    }

    /* Detail Grid (2-column to 1-column) */
    .detail-grid, .card-inner-grid {
        grid-template-columns: 1fr !important;
        gap: var(--spacing-4) !important;
    }

    /* Sidebar Layout (250px 1fr to 1fr) */
    .sidebar-layout {
        grid-template-columns: 1fr !important;
    }
    .sidebar-layout > .card {
        position: static !important; /* Remove sticky on mobile */
    }
    
    /* Hero Header Stacking */
    .hero-header {
        height: auto !important;
        min-height: 200px;
    }
    .hero-header-content {
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: var(--spacing-4) !important;
        height: auto !important;
    }
    .hero-header-actions {
        width: 100% !important;
        flex-direction: column !important;
        gap: var(--spacing-4) !important;
    }
    .hero-header-actions > div {
        width: 100% !important;
        height: 100px !important;
    }
    .hero-header-actions > button {
        width: 100% !important;
    }

    /* Round Item Stacking */
    .round-item {
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: var(--spacing-3) !important;
    }
    .round-item-main {
        width: 100% !important;
    }
    .round-item-layout {
        display: none !important; /* Hide track layout on mobile to save space */
    }
    .round-item-status {
        width: 100% !important;
        text-align: left !important;
    }

    /* Analytics Mini Cards */
    .stats-mini-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
    .stats-mini-grid > .grid-span-3,
    .stats-mini-grid > div {
        grid-column: span 1 !important;
    }
}

/* Generic Grid System */
.responsive-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-6);
}

.grid-span-12 { grid-column: span 12; }
.grid-span-8 { grid-column: span 8; }
.grid-span-6 { grid-column: span 6; }
.grid-span-4 { grid-column: span 4; }
.grid-span-3 { grid-column: span 3; }

/* Dashboard Compatibility */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-6);
}
.dash-span-12 { grid-column: span 12; }
.dash-span-8 { grid-column: span 8; }
.dash-span-4 { grid-column: span 4; }
@media (max-width: 768px) {
    .dashboard-grid { grid-template-columns: 1fr !important; }
    .dashboard-grid > [class*="dash-span-"] { grid-column: span 12 !important; }
}