/* Additional Modern Enhancements for Renal Dosing Calculator */

/* Enhanced Radio Button Styles */
.radio-group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.radio-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
    transition: color var(--transition-fast);
    position: relative;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.radio-label:hover {
    background: rgba(37, 99, 235, 0.05);
    color: var(--primary-color);
}

.radio-label input[type="radio"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.radio-custom {
    position: relative;
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-300);
    border-radius: 50%;
    margin-right: var(--space-sm);
    transition: all var(--transition-normal);
    background: var(--bg-primary);
}

.radio-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary-color);
    transform: translate(-50%, -50%) scale(0);
    transition: transform var(--transition-normal);
}

.radio-label input[type="radio"]:checked + .radio-custom {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.radio-label input[type="radio"]:checked + .radio-custom::after {
    transform: translate(-50%, -50%) scale(1);
}

.radio-label input[type="radio"]:focus + .radio-custom {
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Enhanced Fieldset and Legend */
fieldset {
    border: none;
    padding: 0;
    margin: 0;
    min-width: 0;
}

legend {
    display: block;
    width: 100%;
    margin-bottom: var(--space-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0;
}

.required {
    color: var(--error-color);
    font-weight: bold;
    margin-left: 2px;
}

/* Enhanced Select Styles */
select.form-control {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="none"><path d="M7 7l3 3 3-3" stroke="%236b7280" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>');
    background-repeat: no-repeat;
    background-position: right var(--space-md) center;
    background-size: 20px;
    padding-right: var(--space-3xl);
    appearance: none;
    cursor: pointer;
}

select.form-control:focus {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="none"><path d="M7 7l3 3 3-3" stroke="%232563eb" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/></svg>');
}

/* Enhanced Header Styles */
.header-icon {
    display: inline-block;
    margin-right: var(--space-md);
    font-size: 1.2em;
    animation: bounce 2s infinite;
}

.header-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.badge {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-inverse);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.3);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.badge:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Enhanced Focus States for Accessibility */
.form-control:focus,
.btn:focus,
.tab-button:focus,
.radio-label input:focus + .radio-custom,
select.form-control:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Enhanced Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: var(--text-inverse);
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-md);
    z-index: 1000;
}

.skip-link:focus {
    top: 6px;
}

/* Enhanced Form Validation States */
.form-control:invalid {
    border-color: var(--error-color);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.form-control:valid {
    border-color: var(--success-color);
}

.form-group.error .form-control {
    border-color: var(--error-color);
    background-color: rgba(220, 38, 38, 0.05);
}

.form-group.success .form-control {
    border-color: var(--success-color);
    background-color: rgba(5, 150, 105, 0.05);
}

.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.error-message::before {
    content: '⚠';
    font-size: 1rem;
}

.success-message {
    color: var(--success-color);
    font-size: 0.875rem;
    margin-top: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.success-message::before {
    content: '✓';
    font-size: 1rem;
}

/* Enhanced Loading States */
.pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: .5;
    }
}

/* Enhanced High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --gray-200: #000000;
        --gray-300: #000000;
        --primary-color: #0000ff;
        --text-primary: #000000;
        --bg-primary: #ffffff;
    }
}

/* Enhanced 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;
    }
}

/* Enhanced Dark Mode Support (Future Implementation) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1e293b;
        --bg-secondary: #0f172a;
        --bg-tertiary: #334155;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-tertiary: #94a3b8;
        --text-inverse: #0f172a;
        --gray-200: #475569;
        --gray-300: #64748b;
        --primary-light: rgba(37, 99, 235, 0.2);
    }
    
    .header {
        background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    }
    
    .medication-card,
    .profile-card,
    .chart-container {
        background: var(--bg-primary);
        border-color: var(--gray-200);
    }
}

/* Enhanced Responsive Typography */
@media screen and (max-width: 480px) {
    html {
        font-size: 14px;
    }
}

@media screen and (min-width: 1200px) {
    html {
        font-size: 18px;
    }
}

/* Enhanced Touch Target Sizes for Mobile */
@media (hover: none) and (pointer: coarse) {
    .btn,
    .tab-button,
    .radio-label,
    .medication-option {
        min-height: 44px;
        min-width: 44px;
    }
    
    .form-control {
        min-height: 44px;
    }
}

/* Enhanced Performance Optimizations */
.medication-card,
.profile-card,
.chart-container {
    contain: layout style paint;
    will-change: transform;
}

.loading-screen {
    contain: strict;
}

/* Enhanced CSS Grid Fallbacks */
@supports not (display: grid) {
    .profile-grid,
    .form-grid,
    .medication-grid {
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-lg);
    }
    
    .profile-card {
        flex: 1 1 300px;
    }
}

/* Mobile Touch Enhancements */
@media (max-width: 768px) {
    /* Improved touch targets */
    .form-control,
    .btn,
    .tab-button,
    .medication-option {
        min-height: 44px;
        min-width: 44px;
    }

    /* Better mobile form experience */
    .form-control:focus {
        transform: none;
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
        border-color: var(--primary-color);
    }

    /* Mobile-optimized button hover states */
    .btn:active {
        transform: scale(0.98);
    }

    /* Better mobile dropdown experience */
    .medication-dropdown {
        max-height: 40vh;
        overflow-y: auto;
    }

    /* Improved mobile tab interaction */
    .tab-button:active {
        background: var(--primary-light);
    }

    /* Better mobile medication card interaction */
    .medication-card {
        transition: all var(--transition-normal);
    }

    .medication-card:active {
        transform: scale(0.99);
        box-shadow: var(--shadow-md);
    }

    /* Mobile-friendly form groups */
    .input-section {
        background: var(--bg-secondary);
        border-radius: var(--radius-md);
        padding: var(--space-md);
        margin-bottom: var(--space-md);
    }

    /* Better mobile spacing for selected medications */
    .selected-medications {
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-xs);
        max-height: 120px;
        overflow-y: auto;
    }

    /* Mobile-optimized alerts */
    .warning-message,
    .error {
        position: relative;
        border-left: 4px solid var(--warning-color);
    }

    /* Better mobile scrolling */
    .sidebar,
    .main-content {
        scroll-behavior: smooth;
    }

    /* Mobile keyboard optimization */
    .form-control[inputmode="numeric"] {
        font-variant-numeric: tabular-nums;
    }

    /* Improved mobile accessibility */
    .sr-only {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
    }
}

/* Very small screen optimizations */
@media (max-width: 360px) {
    /* Compact layout for very small screens */
    .sidebar-content h2 {
        font-size: 1rem;
        margin-bottom: var(--space-sm);
    }

    .form-group label {
        font-size: 0.75rem;
        font-weight: 600;
    }

    .help-text {
        font-size: 0.65rem;
        line-height: 1.3;
    }

    /* Tighter spacing */
    .input-section {
        padding: var(--space-sm);
        margin-bottom: var(--space-sm);
    }

    /* Compact buttons */
    .btn {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.8rem;
        min-height: 40px;
    }

    /* Smaller metric displays */
    .metric-value {
        font-size: 1.25rem;
    }

    .metric-label {
        font-size: 0.7rem;
    }
}