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

/* Mobile: 320px - 767px */
@media (max-width: 767px) {
    :root {
        --spacing-xs: 0.375rem;
        --spacing-sm: 0.75rem;
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    /* Navigation */
    .nav-container {
        flex-wrap: wrap;
    }
    
    .nav-menu {
        flex-direction: column;
        width: 100%;
        gap: var(--spacing-sm);
        padding-top: var(--spacing-md);
        display: none;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: block;
        background: none;
        border: none;
        font-size: 1.5rem;
        color: var(--primary-blue);
        cursor: pointer;
    }
    
    /* Hero */
    .hero {
        padding: var(--spacing-xl) 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    /* Cards */
    .account-card {
        padding: var(--spacing-md);
    }
    
    .account-card-compact {
        padding: var(--spacing-sm);
    }
    
    .account-card-compact > div:first-of-type {
        height: 120px !important;
        margin-bottom: var(--spacing-sm) !important;
    }
    
    .account-card-compact img {
        padding: var(--spacing-xs) !important;
    }
    
    .account-rate {
        font-size: 2rem;
    }
    
    /* Buttons */
    .btn {
        width: 100%;
        padding: 1rem 1.5rem;
    }
    
    .btn-cta {
        font-size: 1rem;
    }
    
    /* Forms */
    .form-input,
    .form-textarea,
    .form-select {
        padding: 0.75rem;
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* Tablet: 768px - 1023px */
@media (min-width: 768px) and (max-width: 1023px) {
    .nav-toggle {
        display: none;
    }
    
    .nav-menu {
        display: flex;
    }
    
    .account-card {
        padding: var(--spacing-lg);
    }
    
    .btn {
        width: auto;
    }
}

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
    .nav-toggle {
        display: none;
    }
    
    .nav-menu {
        display: flex;
    }
    
    /* Grid layouts */
    .grid-2 {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
    
    .grid-3 {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-lg);
    }
    
    .grid-4 {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-lg);
    }
}

/* Large Desktop: 1440px+ */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
}

/* Touch-friendly elements for mobile */
@media (hover: none) and (pointer: coarse) {
    .btn,
    .card,
    .account-card,
    .review-card {
        min-height: 44px;
    }
    
    .nav-link {
        padding: 0.75rem 0;
    }
    
    .form-input,
    .form-textarea,
    .form-select {
        min-height: 44px;
    }
}

/* Print styles */
@media print {
    .nav,
    .footer,
    .btn,
    .nav-toggle {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .card,
    .account-card {
        box-shadow: none;
        border: 1px solid #ccc;
        page-break-inside: avoid;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-light: #000000;
        --text-gray: #000000;
    }
    
    .card,
    .account-card {
        border: 2px solid #000000;
    }
}

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

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    /* Can be implemented if needed */
}