/* =================================
   Responsive Styles
   Mobile-First Approach
   ================================= */

/* ===== Tablet (768px and below) ===== */
@media (max-width: 768px) {
    /* Container */
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    /* Navigation */
    .nav-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    /* Hero */
    .hero {
        padding: calc(var(--navbar-height) + var(--spacing-3xl)) 0 var(--spacing-3xl);
    }
    
    .hero-title {
        font-size: clamp(2rem, 8vw, 3rem);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    /* Features */
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    /* Products */
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    /* Use Cases */
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
    
    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    /* Section padding */
    .features,
    .products,
    .use-cases,
    .cta-section {
        padding: var(--spacing-3xl) 0;
    }
    
    /* Section headers */
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-subtitle {
        font-size: var(--font-size-base);
    }
    
    .cta-title {
        font-size: var(--font-size-3xl);
    }
    
    .cta-description {
        font-size: var(--font-size-base);
    }
}

/* ===== Mobile (480px and below) ===== */
@media (max-width: 480px) {
    /* Container */
    .container {
        padding: 0 var(--spacing-md);
    }
    
    /* Navigation */
    .nav-brand {
        font-size: var(--font-size-lg);
    }
    
    .nav-actions {
        gap: var(--spacing-sm);
    }
    
    /* Hero */
    .hero-title {
        font-size: clamp(1.75rem, 7vw, 2.5rem);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    /* Product Cards */
    .product-card {
        padding: var(--spacing-xl);
    }
    
    /* Buttons */
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }
    
    /* CTA Buttons */
    .cta-buttons {
        flex-direction: column;
    }
    
    .cta-buttons .btn {
        width: 100%;
    }
}

/* ===== Desktop Large (1400px and above) ===== */
@media (min-width: 1400px) {
    :root {
        --container-width: 1320px;
    }
    
    .hero-title {
        font-size: 4.5rem;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-2xl);
    }
}

/* ===== Print Styles ===== */
@media print {
    .navbar,
    .hero-cta,
    .cta-section,
    .footer {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ===== High Contrast Mode ===== */
@media (prefers-contrast: high) {
    :root {
        --color-border: #000000;
        --color-text-secondary: #1a1a1a;
    }
}