/* ============================================================================
   FORM VALIDATION STYLES - ROBOTICS & CONTROL LTD
   
   Professional form validation styling system providing visual feedback for
   user input validation. Includes error states, success indicators, loading
   states, and accessibility-compliant styling.
   
   Features:
   - Real-time validation feedback styling
   - Error and success state indicators
   - Professional color-coded validation states
   - Accessibility-compliant contrast ratios
   - Smooth animations for state transitions
   - Cross-browser compatible styling
   
   Usage: Applied automatically by validation-client.js
   Dependencies: Works with FormValidator JavaScript class
   Browser Support: Modern browsers (Chrome 60+, Firefox 55+, Safari 12+)
   ============================================================================ */

/* ==================== FIELD VALIDATION STATES ==================== */

/* Invalid field styling */
.form-input.invalid,
.form-textarea.invalid,
.form-select.invalid,
input.invalid,
textarea.invalid,
select.invalid {
    border-color: #dc2626 !important;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1) !important;
    background-color: rgba(254, 242, 242, 0.5);
}

/* Valid field styling */
.form-input.valid,
.form-textarea.valid,
.form-select.valid,
input.valid,
textarea.valid,
select.valid {
    border-color: #16a34a !important;
    box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.1) !important;
    background-color: rgba(240, 253, 244, 0.5);
}

/* Focus states for validation */
.form-input.invalid:focus,
.form-textarea.invalid:focus,
input.invalid:focus,
textarea.invalid:focus {
    border-color: #dc2626 !important;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.2) !important;
    outline: none;
}

.form-input.valid:focus,
.form-textarea.valid:focus,
input.valid:focus,
textarea.valid:focus {
    border-color: #16a34a !important;
    box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.2) !important;
    outline: none;
}

/* ==================== ERROR MESSAGES ==================== */

/* Field error messages */
.field-error {
    display: block;
    color: #dc2626;
    font-size: 0.875rem;
    font-weight: 500;
    margin-top: 0.375rem;
    line-height: 1.25;
    -webkit-animation: slideInError 0.2s ease-out;
    -moz-animation: slideInError 0.2s ease-out;
    -ms-animation: slideInError 0.2s ease-out;
    animation: slideInError 0.2s ease-out;
}

@-webkit-keyframes slideInError {
    from {
        opacity: 0;
        -webkit-transform: translateY(-0.25rem);
        transform: translateY(-0.25rem);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
}
@-moz-keyframes slideInError {
    from {
        opacity: 0;
        -moz-transform: translateY(-0.25rem);
        transform: translateY(-0.25rem);
    }
    to {
        opacity: 1;
        -moz-transform: translateY(0);
        transform: translateY(0);
    }
}
@-ms-keyframes slideInError {
    from {
        opacity: 0;
        -ms-transform: translateY(-0.25rem);
        transform: translateY(-0.25rem);
    }
    to {
        opacity: 1;
        -ms-transform: translateY(0);
        transform: translateY(0);
    }
}
@keyframes slideInError {
    from {
        opacity: 0;
        -webkit-transform: translateY(-0.25rem);
        -moz-transform: translateY(-0.25rem);
        -ms-transform: translateY(-0.25rem);
        transform: translateY(-0.25rem);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
        -moz-transform: translateY(0);
        -ms-transform: translateY(0);
        transform: translateY(0);
    }
}

/* Icon indicators for validation states */
.form-input.invalid,
.form-textarea.invalid,
input.invalid,
textarea.invalid {
    padding-right: 2.5rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23dc2626'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M6 18L18 6M6 6l12 12'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1rem 1rem;
}

.form-input.valid,
.form-textarea.valid,
input.valid,
textarea.valid {
    padding-right: 2.5rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2316a34a'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M5 13l4 4L19 7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1rem 1rem;
}

/* ==================== FORM VALIDATION SUMMARY ==================== */

/* Form-level error summary */
.form-errors {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
    animation: slideInError 0.3s ease-out;
}

.form-errors-title {
    color: #dc2626;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-errors-title::before {
    content: '⚠️';
    font-size: 1rem;
}

.form-errors-list {
    color: #dc2626;
    font-size: 0.875rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.form-errors-list li {
    margin-bottom: 0.25rem;
    padding-left: 1rem;
    position: relative;
}

.form-errors-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #dc2626;
    font-weight: bold;
}

/* ==================== SUCCESS INDICATORS ==================== */

/* Form success message */
.form-success {
    background-color: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
    color: #15803d;
    -webkit-animation: slideInSuccess 0.3s ease-out;
    -moz-animation: slideInSuccess 0.3s ease-out;
    -ms-animation: slideInSuccess 0.3s ease-out;
    animation: slideInSuccess 0.3s ease-out;
}

@-webkit-keyframes slideInSuccess {
    from {
        opacity: 0;
        -webkit-transform: translateY(-0.25rem) scale(0.95);
        transform: translateY(-0.25rem) scale(0.95);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0) scale(1);
        transform: translateY(0) scale(1);
    }
}
@-moz-keyframes slideInSuccess {
    from {
        opacity: 0;
        -moz-transform: translateY(-0.25rem) scale(0.95);
        transform: translateY(-0.25rem) scale(0.95);
    }
    to {
        opacity: 1;
        -moz-transform: translateY(0) scale(1);
        transform: translateY(0) scale(1);
    }
}
@-ms-keyframes slideInSuccess {
    from {
        opacity: 0;
        -ms-transform: translateY(-0.25rem) scale(0.95);
        transform: translateY(-0.25rem) scale(0.95);
    }
    to {
        opacity: 1;
        -ms-transform: translateY(0) scale(1);
        transform: translateY(0) scale(1);
    }
}
@keyframes slideInSuccess {
    from {
        opacity: 0;
        -webkit-transform: translateY(-0.25rem) scale(0.95);
        -moz-transform: translateY(-0.25rem) scale(0.95);
        -ms-transform: translateY(-0.25rem) scale(0.95);
        transform: translateY(-0.25rem) scale(0.95);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0) scale(1);
        -moz-transform: translateY(0) scale(1);
        -ms-transform: translateY(0) scale(1);
        transform: translateY(0) scale(1);
    }
}

.form-success-title {
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-success-title::before {
    content: '✅';
    font-size: 1rem;
}

/* ==================== LOADING STATES ==================== */

/* Form submission loading state */
.form-submitting {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.form-submitting::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 2rem;
    height: 2rem;
    margin: -1rem 0 0 -1rem;
    background: #0891b2;
    clip-path: polygon(
        50% 0%, 60% 10%, 90% 10%, 100% 50%, 90% 90%, 60% 90%, 50% 100%,
        40% 90%, 10% 90%, 0% 50%, 10% 10%, 40% 10%
    );
    -webkit-animation: spin 1s linear infinite;
    -moz-animation: spin 1s linear infinite;
    -ms-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
}

@-webkit-keyframes spin {
    0% { -webkit-transform: rotate(0deg); transform: rotate(0deg); }
    100% { -webkit-transform: rotate(360deg); transform: rotate(360deg); }
}
@-moz-keyframes spin {
    0% { -moz-transform: rotate(0deg); transform: rotate(0deg); }
    100% { -moz-transform: rotate(360deg); transform: rotate(360deg); }
}
@-ms-keyframes spin {
    0% { -ms-transform: rotate(0deg); transform: rotate(0deg); }
    100% { -ms-transform: rotate(360deg); transform: rotate(360deg); }
}
@keyframes spin {
    0% { -webkit-transform: rotate(0deg); -moz-transform: rotate(0deg); -ms-transform: rotate(0deg); transform: rotate(0deg); }
    100% { -webkit-transform: rotate(360deg); -moz-transform: rotate(360deg); -ms-transform: rotate(360deg); transform: rotate(360deg); }
}

/* Submit button loading state */
.btn-submitting {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-submitting::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 1rem;
    height: 1rem;
    margin: -0.5rem 0 0 -0.5rem;
    background: currentColor;
    clip-path: polygon(
        50% 0%, 60% 10%, 90% 10%, 100% 50%, 90% 90%, 60% 90%, 50% 100%,
        40% 90%, 10% 90%, 0% 50%, 10% 10%, 40% 10%
    );
    -webkit-animation: spin 1s linear infinite;
    -moz-animation: spin 1s linear infinite;
    -ms-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
}

/* ==================== ACCESSIBILITY ==================== */

/* Screen reader only content */
.sr-only {
    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;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .form-input.invalid,
    .form-textarea.invalid,
    input.invalid,
    textarea.invalid {
        border-width: 2px;
        outline: 2px solid #dc2626;
        outline-offset: 1px;
    }
    
    .form-input.valid,
    .form-textarea.valid,
    input.valid,
    textarea.valid {
        border-width: 2px;
        outline: 2px solid #16a34a;
        outline-offset: 1px;
    }
    
    .field-error {
        font-weight: bold;
        text-decoration: underline;
    }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    .field-error,
    .form-errors,
    .form-success {
        animation: none;
    }
    
    .form-submitting::after,
    .btn-submitting::after {
        animation: none;
    }
}

/* ==================== RESPONSIVE VALIDATION ==================== */

/* Mobile-specific validation styles */
@media (max-width: 768px) {
    .field-error {
        font-size: 0.8125rem;
        margin-top: 0.25rem;
    }
    
    .form-errors,
    .form-success {
        padding: 0.75rem;
        margin-bottom: 1rem;
        font-size: 0.875rem;
    }
    
    /* Adjust icon positioning for mobile */
    .form-input.invalid,
    .form-input.valid,
    input.invalid,
    input.valid {
        padding-right: 2rem;
        background-size: 0.875rem 0.875rem;
        background-position: right 0.5rem center;
    }
}

/* ==================== DARK MODE SUPPORT ==================== */

@media (prefers-color-scheme: dark) {
    .form-input.invalid,
    .form-textarea.invalid,
    input.invalid,
    textarea.invalid {
        background-color: rgba(127, 29, 29, 0.2);
        border-color: #f87171;
    }
    
    .form-input.valid,
    .form-textarea.valid,
    input.valid,
    textarea.valid {
        background-color: rgba(21, 128, 61, 0.2);
        border-color: #4ade80;
    }
    
    .field-error {
        color: #f87171;
    }
    
    .form-errors {
        background-color: rgba(127, 29, 29, 0.1);
        border-color: #7f1d1d;
        color: #f87171;
    }
    
    .form-success {
        background-color: rgba(21, 128, 61, 0.1);
        border-color: #15803d;
        color: #4ade80;
    }
}

/* ==================== TOOLTIP VALIDATION ==================== */

/* Validation tooltip for enhanced feedback */
.validation-tooltip {
    position: absolute;
    z-index: 1000;
    background-color: #1f2937;
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    max-width: 200px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    animation: fadeInTooltip 0.2s ease-out;
}

.validation-tooltip::before {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #1f2937 transparent transparent transparent;
}

@keyframes fadeInTooltip {
    from {
        opacity: 0;
        transform: translateY(-0.5rem);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== REAL-TIME VALIDATION FEEDBACK ==================== */

/* Password strength indicator */
.password-strength {
    margin-top: 0.5rem;
    padding: 0.5rem;
    border-radius: 0.375rem;
    background-color: #f9fafb;
    border: 1px solid #e5e7eb;
}

.password-strength-bar {
    height: 0.25rem;
    background-color: #e5e7eb;
    border-radius: 0.125rem;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.password-strength-fill {
    height: 100%;
    transition: width 0.3s ease, background-color 0.3s ease;
    border-radius: 0.125rem;
}

.password-strength-fill.weak {
    background-color: #dc2626;
    width: 25%;
}

.password-strength-fill.fair {
    background-color: #f59e0b;
    width: 50%;
}

.password-strength-fill.good {
    background-color: #10b981;
    width: 75%;
}

.password-strength-fill.strong {
    background-color: #059669;
    width: 100%;
}

.password-strength-text {
    font-size: 0.75rem;
    color: #6b7280;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Character count indicator */
.character-count {
    font-size: 0.75rem;
    color: #6b7280;
    margin-top: 0.25rem;
    text-align: right;
}

.character-count.warning {
    color: #f59e0b;
}

.character-count.error {
    color: #dc2626;
}