/**
 * File: responsive.css
 * Purpose: Responsive media queries controlling layout density, grids, typography scaling, spacing, navigation
 *          visibility and accessibility adjustments across breakpoints.
 * Breakpoints: 480px (mobile), 768px (tablet), 1024px (tablet large), 1200px (desktop baseline).
 */

@media (max-width: 480px) {
    .container {
        width: calc(100% - (2 * var(--spacing-sm)));
        padding-top: var(--spacing-sm);
        padding-bottom: var(--spacing-sm);
    }
    
    .mobile-menu-toggle {
        width: 26px !important;
        height: 26px !important;
        --hamburger-size: 26px;
        --hamburger-line-height: 2.5px;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px) !important;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px) !important;
    }
}

.grid {
    display: grid;
    gap: var(--gap-medium);
    grid-template-columns: 1fr;
}

@media (min-width: 481px) {
    .grid-2-cols {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 769px) {
    .grid-3-cols {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .grid-4-cols {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1025px) {
    .grid-4-cols {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 480px) {
    h1, .h1 {
        line-height: 1.1;
        margin-bottom: var(--spacing-md);
    }
    
    h2, .h2 {
        line-height: 1.15;
        margin-bottom: var(--spacing-sm);
    }
    
    h3, .h3 {
        line-height: 1.2;
        margin-bottom: var(--spacing-sm);
    }
    
    p {
        line-height: 1.6;
        margin-bottom: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .card {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .section {
        padding: var(--spacing-xxl) 0;
    }
    
    .card {
        padding: var(--spacing-lg);
        margin-bottom: var(--spacing-xl);
    }
    
    .mobile-menu-toggle {
        width: 30px !important;
        height: 30px !important;
        --hamburger-size: 30px;
        --hamburger-line-height: 3px;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-button);
        width: 100%;
        text-align: center;
    }

    .btn i.fas,
    .btn i.far,
    .btn i.fab,
    .btn .fas,
    .btn .far,
    .btn .fab {
        margin-right: 8px;
    }
    
    .btn-group {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .btn-group .btn {
        width: 100%;
    }
}

@media (min-width: 481px) {
    .btn {
        width: auto;
        min-width: 120px;
    }
}

.icon {
    font-size: var(--icon-size-md);
    transition: var(--transition-normal);
}

.icon-xs { font-size: var(--icon-size-xs); }
.icon-sm { font-size: var(--icon-size-sm); }
.icon-md { font-size: var(--icon-size-md); }
.icon-lg { font-size: var(--icon-size-lg); }
.icon-xl { font-size: var(--icon-size-xl); }
.icon-xxl { font-size: var(--icon-size-xxl); }

@media (max-width: 480px) {
    .icon-lg { font-size: var(--icon-size-md); }
    .icon-xl { font-size: var(--icon-size-lg); }
    .icon-xxl { font-size: var(--icon-size-xl); }
}

@media (max-width: 480px) {
    .form-group {
        margin-bottom: var(--spacing-md);
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .form-row .form-group {
        width: 100%;
        margin-right: 0;
    }
    
    input, textarea, select {
        font-size: 16px;
    }
}

@media (max-width: 1024px) {
    .desktop-nav {
        display: none;
    }
    
    .mobile-nav {
        display: block;
    }
}

@media (min-width: 1025px) {
    .mobile-nav {
        display: none;
    }
    
    .desktop-nav {
        display: flex;
    }
}

@media (max-width: 480px) {
    header .logo img,
    .footer-column .footer-logo img {
        transition: all 0.3s ease;
    }
    .footer-column .footer-logo img {
        margin: 0 auto;
    }
    .footer-column .footer-logo {
        text-align: center;
        width: 100%;
    }
    .mobile-menu-toggle {
        transition: none !important;
    }
    .mobile-menu-toggle span {
        transition: var(--transition-normal) !important;
    }
    footer::before {
        height: 180px;
        transition: height 0.3s ease;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    header .logo img,
    .footer-column .footer-logo img {
        transition: all 0.3s ease;
    }
    
    .footer-column .footer-logo img {
        margin-bottom: var(--spacing-md);
    }
    .footer-column .footer-logo {
        text-align: center;
        width: 100%;
    }
}

@media (min-width: 769px) {
    header .logo img,
    .footer-column .footer-logo img {
        transition: all 0.3s ease;
    }
}

@media (max-width: 480px) {
    .cards-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
}

@media (min-width: 769px) {
    .cards-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xl);
    }
}

/* Utility alignment */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

@media (max-width: 768px) {
    .text-center-mobile { text-align: center; }
    .text-left-mobile { text-align: left; }
    .text-right-mobile { text-align: right; }
}

.hide-mobile { display: block; }
.show-mobile { display: none; }

@media (max-width: 768px) {
    .hide-mobile { display: none !important; }
    .show-mobile { display: block !important; }
}

.hide-tablet { display: block; }
.show-tablet { display: none; }

@media (min-width: 481px) and (max-width: 1024px) {
    .hide-tablet { display: none !important; }
    .show-tablet { display: block !important; }
}

.hide-desktop { display: block; }
.show-desktop { display: none; }

@media (min-width: 1025px) {
    .hide-desktop { display: none !important; }
    .show-desktop { display: block !important; }
}

.spacing-mobile-only { display: none; }
@media (max-width: 768px) {
    .spacing-mobile-only { display: block; height: var(--spacing-md); }
}

.spacing-desktop-only { display: block; height: var(--spacing-lg); }
@media (max-width: 768px) {
    .spacing-desktop-only { display: none; }
}

.w-full { width: 100%; }
.w-auto { width: auto; }

@media (max-width: 768px) {
    .w-full-mobile { width: 100% !important; }
    .w-auto-mobile { width: auto !important; }
}

.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }

@media (max-width: 768px) {
    .flex-col-mobile { flex-direction: column !important; }
    .flex-row-mobile { flex-direction: row !important; }
}

@media (max-width: 480px) {
    button:not(.mobile-menu-toggle), .btn, a {
        min-height: 44px;
        min-width: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    
    .mobile-menu-toggle {
        min-height: unset !important;
        min-width: unset !important;
        width: 26px !important;
        height: 26px !important;
        justify-content: space-evenly !important;
        --hamburger-size: 26px;
        --hamburger-line-height: 2.5px;
    }
    
    .mobile-menu-toggle span {
        height: var(--hamburger-line-height) !important;
        transform-origin: center center !important;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px) !important;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px) !important;
    }
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */
@media (max-width: 768px) {
    * {
        animation-duration: 0.1s !important;
        animation-delay: 0s !important;
    }
    .no-touch-hover:hover {
        transform: none !important;
        box-shadow: var(--shadow-card) !important;
    }
}