/**
 * Responsive & Accessibility Improvements
 * Optimized for mobile devices and WCAG compliance
 */

/* ========== Root Variables for Accessibility ========== */
:root {
    /* High contrast color palette */
    --primary-color: #0056b3;
    --secondary-color: #6c757d;
    --success-color: #155724;
    --danger-color: #721c24;
    --warning-color: #856404;
    --info-color: #004085;
    
    /* Text colors with proper contrast ratios */
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-light: #6c757d;
    --text-on-primary: #ffffff;
    
    /* Background colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    
    /* Focus indicators */
    --focus-color: #0056b3;
    --focus-shadow: 0 0 0 3px rgba(0, 86, 179, 0.25);
    
    /* Spacing for touch targets */
    --min-touch-target: 44px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Typography */
    --font-size-base: 16px;
    --line-height-base: 1.5;
}

/* ========== Global Accessibility Improvements ========== */

/* Focus Styles */
*:focus {
    outline: 3px solid var(--focus-color);
    outline-offset: 2px;
    box-shadow: var(--focus-shadow);
}

/* Skip to main content link */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: var(--text-on-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 10000;
    text-decoration: none;
    border-radius: 0 0 4px 0;
}

.skip-to-content:focus {
    top: 0;
}

/* Ensure all interactive elements meet minimum touch target size */
button,
a,
input,
textarea,
select,
[role="button"],
[tabindex]:not([tabindex="-1"]) {
    min-height: var(--min-touch-target);
    min-width: var(--min-touch-target);
}

/* Improve form field accessibility */
label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
}

input,
textarea,
select {
    font-size: var(--font-size-base);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid #ced4da;
    border-radius: 4px;
    width: 100%;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

/* ARIA live regions for screen readers */
[aria-live="polite"],
[aria-live="assertive"] {
    position: relative;
}

/* ========== Mobile Responsiveness ========== */

/* Mobile First Approach */
@media screen and (max-width: 576px) {
    /* Typography adjustments */
    body {
        font-size: 14px;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    h3 {
        font-size: 1.25rem;
    }
    
    /* Form improvements */
    .form-group {
        margin-bottom: var(--spacing-lg);
    }
    
    /* Stack form elements on mobile */
    .row > [class*="col-"] {
        margin-bottom: var(--spacing-md);
    }
    
    /* Full-width buttons on mobile */
    .btn {
        width: 100%;
        margin-bottom: var(--spacing-sm);
        padding: var(--spacing-md);
    }
    
    /* Card adjustments */
    .card {
        border-radius: 8px;
        margin-bottom: var(--spacing-md);
    }
    
    .card-body {
        padding: var(--spacing-md);
    }
    
    /* Navigation improvements */
    .navbar {
        padding: var(--spacing-sm);
    }
    
    .navbar-nav {
        text-align: center;
    }
    
    .navbar-nav .nav-link {
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--bg-tertiary);
    }
    
    /* Modal adjustments */
    .modal-dialog {
        margin: var(--spacing-sm);
        max-width: calc(100% - var(--spacing-md));
    }
    
    /* Table responsiveness */
    table {
        font-size: 0.875rem;
    }
    
    /* Hide non-essential columns on mobile */
    .d-none-mobile {
        display: none !important;
    }
    
    /* Account type cards stack on mobile */
    .account-type-card {
        margin-bottom: var(--spacing-md);
    }
    
    /* Profile form sections */
    .form-section {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }
    
    .section-icon {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.1rem;
    }
    
    /* Steps indicator mobile */
    .step-indicator {
        font-size: 0.875rem;
    }
    
    .step {
        width: 30px;
        height: 30px;
        font-size: 0.75rem;
    }
    
    .step-line {
        width: 50px;
    }
}

/* Tablet Responsiveness */
@media screen and (min-width: 577px) and (max-width: 768px) {
    .container {
        max-width: 100%;
        padding: 0 var(--spacing-md);
    }
    
    .col-md-6 {
        width: 100%;
    }
    
    .btn {
        min-width: 120px;
    }
}

/* Desktop Enhancements */
@media screen and (min-width: 769px) {
    /* Hover states only on desktop */
    @media (hover: hover) {
        button:hover,
        a:hover,
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
        }
        
        .card:hover {
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
            transition: box-shadow 0.3s ease;
        }
    }
}

/* ========== High Contrast Mode Support ========== */
@media (prefers-contrast: high) {
    * {
        border-color: currentColor !important;
    }
    
    button,
    .btn {
        border: 2px solid currentColor;
    }
    
    input,
    textarea,
    select {
        border-width: 3px;
    }
}

/* ========== 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;
        scroll-behavior: auto !important;
    }
}

/* ========== Dark Mode Support ========== */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f8f9fa;
        --text-secondary: #adb5bd;
        --bg-primary: #212529;
        --bg-secondary: #343a40;
        --bg-tertiary: #495057;
        --focus-color: #6ea8fe;
    }
    
    body {
        background-color: var(--bg-primary);
        color: var(--text-primary);
    }
    
    .card {
        background-color: var(--bg-secondary);
        border-color: var(--bg-tertiary);
    }
    
    input,
    textarea,
    select {
        background-color: var(--bg-secondary);
        color: var(--text-primary);
        border-color: var(--bg-tertiary);
    }
    
    .btn-primary {
        background-color: #0d6efd;
        border-color: #0d6efd;
    }
    
    .btn-secondary {
        background-color: var(--bg-tertiary);
        border-color: var(--bg-tertiary);
        color: var(--text-primary);
    }
}

/* ========== Form Validation Styles ========== */
.form-control.is-valid {
    border-color: var(--success-color);
    padding-right: calc(1.5em + 0.75rem);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%23155724' d='M2.3 6.73.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-control.is-invalid {
    border-color: var(--danger-color);
    padding-right: calc(1.5em + 0.75rem);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23721c24'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23721c24' stroke='none'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

/* ========== Loading States ========== */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.6;
}

.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-color);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ========== Touch-friendly Improvements ========== */
@media (pointer: coarse) {
    /* Increase tap target size on touch devices */
    button,
    a,
    input[type="checkbox"],
    input[type="radio"] {
        min-height: 48px;
        min-width: 48px;
    }
    
    /* Increase spacing between interactive elements */
    .btn + .btn {
        margin-left: var(--spacing-md);
    }
    
    /* Larger form controls on touch */
    input,
    textarea,
    select {
        padding: var(--spacing-md);
        font-size: 16px; /* Prevent zoom on iOS */
    }
}

/* ========== Print Styles ========== */
@media print {
    /* Hide non-essential elements */
    nav,
    .navbar,
    .sidebar,
    .footer,
    button,
    .btn,
    .no-print {
        display: none !important;
    }
    
    /* Optimize for printing */
    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
        background: #fff;
    }
    
    a {
        text-decoration: underline;
        color: #000;
    }
    
    /* Show URLs for links */
    a[href]:after {
        content: " (" attr(href) ")";
    }
}

/* ========== Utility Classes ========== */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.text-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.touch-friendly {
    padding: var(--spacing-md);
    margin: var(--spacing-sm) 0;
}

/* Ensure sufficient color contrast */
.high-contrast {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid currentColor;
}

/* Keyboard navigation indicator */
.keyboard-focus:focus {
    outline: 3px dashed var(--focus-color);
    outline-offset: 4px;
}