/* =============================================================================
   RESPONSIVE DESIGN - Tablet (768px and below)
   ============================================================================= */

@media (max-width: 768px) {
    :root {
        --sidebar-width: var(--sidebar-width-collapsed);
    }

    /* Sidebar Collapse */
    .sidebar {
        transform: translateX(-100%);
        width: 100%;
        max-width: 280px;
    }

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

    /* Show Hamburger */
    .hamburger {
        display: flex;
    }

    /* Sidebar Close Button */
    .sidebar-close {
        display: flex;
    }

    /* Hide nav text on mobile sidebar */
    .sidebar.collapsed .nav-text,
    .sidebar.collapsed .user-email {
        display: none;
    }

    /* Logo text hidden when sidebar collapsed */
    .sidebar.collapsed .logo-text {
        display: none;
    }

    /* Main content adjustment */
    .main-content {
        margin-left: 0;
    }

    /* Header adjustment */
    .header {
        padding: var(--space-xl) var(--space-lg);
    }

    .header-title {
        font-size: 24px;
    }

    .header-subtitle {
        font-size: 12px;
    }

    /* Stock grid - 2 columns */
    .stocks-container {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-lg);
        padding: 0 var(--space-lg) var(--space-lg) var(--space-lg);
    }

    /* Overlay when sidebar is open */
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .sidebar-overlay.open {
        display: block;
    }
}

/* =============================================================================
   RESPONSIVE DESIGN - Mobile (480px and below)
   ============================================================================= */

@media (max-width: 480px) {
    :root {
        --space-xl: 16px;
        --space-2xl: 20px;
    }

    /* Stock grid - 1 column */
    .stocks-container {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
        padding: 0 var(--space-lg) var(--space-lg) var(--space-lg);
    }

    /* Header */
    .header {
        padding: var(--space-lg);
        margin-bottom: var(--space-lg);
    }

    .header-title {
        font-size: 20px;
    }

    /* Hamburger position adjustment */
    .hamburger {
        top: 12px;
        left: 12px;
        width: 36px;
        height: 36px;
    }

    /* Stock card */
    .stock-card {
        padding: var(--space-lg);
    }

    .card-price {
        font-size: 24px;
    }

    .card-stats {
        gap: var(--space-md);
    }

    /* Page padding */
    .page {
        padding: 0 var(--space-lg) var(--space-lg) var(--space-lg);
    }

    /* Sidebar width */
    .sidebar {
        max-width: 100vw;
    }

    /* Page content */
    .page-content {
        padding: var(--space-lg);
    }

    .page-content h2 {
        font-size: 18px;
    }

    /* User section stack on mobile */
    .user-section {
        flex-direction: column;
    }

    .user-avatar {
        width: 40px;
        height: 40px;
    }

    .btn-logout {
        width: 100%;
    }
}

/* =============================================================================
   LARGE SCREENS (1200px and above)
   ============================================================================= */

@media (min-width: 1200px) {
    .stocks-container {
        grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    }
}

/* =============================================================================
   EXTRA LARGE SCREENS (1600px and above)
   ============================================================================= */

@media (min-width: 1600px) {
    .stocks-container {
        grid-template-columns: repeat(4, 1fr);
    }
}