/**
 * ===============================================================================
 * BALAM AI - Form Utilities CSS
 * ===============================================================================
 *
 * Comprehensive form validation, loading states, and password strength styling.
 * Works with form-utils.js for real-time validation feedback.
 *
 * Features:
 *   - Form validation states (.is-valid, .is-invalid)
 *   - Error/success message styling
 *   - Loading button state with spinner
 *   - Password strength indicator
 *   - Enhanced input focus/hover/active states
 *   - Disabled state styling
 *
 * @requires variables.css
 * @version 1.0.0
 * ===============================================================================
 */

/* =============================================================================
   ANIMATIONS
   ============================================================================= */

@keyframes formSpinner {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@keyframes formShake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-4px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(4px);
    }
}

@keyframes formFadeIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes formPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

@keyframes strengthBarFill {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

/* =============================================================================
   FORM VALIDATION STATES
   ============================================================================= */

/* -----------------------------------------------------------------------------
   Valid Input State
   ----------------------------------------------------------------------------- */

.form-control.is-valid,
.auth-form .form-control.is-valid {
    border-color: var(--balam-success) !important;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%2310b981'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.25rem;
    padding-right: 3rem;
}

.form-control.is-valid:focus,
.auth-form .form-control.is-valid:focus {
    border-color: var(--balam-success) !important;
    box-shadow: 0 0 0 4px rgba(var(--balam-success-rgb), 0.15) !important;
}

/* Valid state for input groups */
.input-group .form-control.is-valid {
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

.input-group:has(.form-control.is-valid) .input-group-text {
    border-color: var(--balam-success) !important;
}

/* -----------------------------------------------------------------------------
   Invalid Input State
   ----------------------------------------------------------------------------- */

.form-control.is-invalid,
.auth-form .form-control.is-invalid {
    border-color: var(--balam-danger) !important;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23ef4444'%3E%3Cpath d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm1 15h-2v-2h2v2zm0-4h-2V7h2v6z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.25rem;
    padding-right: 3rem;
    animation: formShake 0.4s ease-in-out;
}

.form-control.is-invalid:focus,
.auth-form .form-control.is-invalid:focus {
    border-color: var(--balam-danger) !important;
    box-shadow: 0 0 0 4px rgba(var(--balam-danger-rgb), 0.15) !important;
}

/* Invalid state for input groups */
.input-group .form-control.is-invalid {
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

.input-group:has(.form-control.is-invalid) .input-group-text {
    border-color: var(--balam-danger) !important;
}

/* =============================================================================
   FEEDBACK MESSAGES
   ============================================================================= */

/* -----------------------------------------------------------------------------
   Base Feedback Styles
   ----------------------------------------------------------------------------- */

.form-feedback,
.invalid-feedback,
.valid-feedback {
    display: none;
    font-size: 0.8125rem;
    margin-top: 0.5rem;
    padding: 0.375rem 0.75rem;
    border-radius: 8px;
    animation: formFadeIn 0.2s ease-out;
}

/* Show feedback when sibling input has validation class */
.form-control.is-invalid ~ .invalid-feedback,
.form-control.is-invalid + .input-group-text + .invalid-feedback,
.input-group:has(.form-control.is-invalid) ~ .invalid-feedback,
.is-invalid ~ .invalid-feedback {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-control.is-valid ~ .valid-feedback,
.form-control.is-valid + .input-group-text + .valid-feedback,
.input-group:has(.form-control.is-valid) ~ .valid-feedback,
.is-valid ~ .valid-feedback {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Force show with .show class */
.invalid-feedback.show,
.valid-feedback.show {
    display: flex !important;
    align-items: center;
    gap: 0.5rem;
}

/* -----------------------------------------------------------------------------
   Invalid Feedback (Error Messages)
   ----------------------------------------------------------------------------- */

.invalid-feedback {
    color: #f87171;
    background: rgba(var(--balam-danger-rgb), 0.1);
    border: 1px solid rgba(var(--balam-danger-rgb), 0.2);
}

.invalid-feedback::before {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23f87171'%3E%3Cpath d='M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm1 15h-2v-2h2v2zm0-4h-2V7h2v6z'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
}

/* -----------------------------------------------------------------------------
   Valid Feedback (Success Messages)
   ----------------------------------------------------------------------------- */

.valid-feedback {
    color: #34d399;
    background: rgba(var(--balam-success-rgb), 0.1);
    border: 1px solid rgba(var(--balam-success-rgb), 0.2);
}

.valid-feedback::before {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%2334d399'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
}

/* =============================================================================
   LOADING BUTTON STATE
   ============================================================================= */

.btn-loading,
.btn.is-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
    cursor: not-allowed;
}

.btn-loading::after,
.btn.is-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: formSpinner 0.8s linear infinite;
}

/* Dark spinner for light buttons */
.btn-outline-primary.btn-loading::after,
.btn-outline-secondary.btn-loading::after,
.btn-light.btn-loading::after {
    border: 2px solid rgba(67, 97, 238, 0.3);
    border-top-color: var(--balam-primary);
}

/* Loading button text wrapper (for preserving button width) */
.btn-loading .btn-text,
.btn.is-loading .btn-text {
    visibility: hidden;
}

/* Spinner inside button (alternative approach) */
.btn .spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: formSpinner 0.8s linear infinite;
}

.btn.is-loading .spinner {
    display: inline-block;
}

.btn.is-loading .btn-label {
    display: none;
}

/* =============================================================================
   PASSWORD STRENGTH INDICATOR
   ============================================================================= */

.password-strength {
    margin-top: 0.75rem;
}

.password-strength-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.75rem;
    color: var(--balam-dark-text-muted);
}

.password-strength-text {
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: color 0.3s ease;
}

/* Strength Bars Container */
.password-strength-bars {
    display: flex;
    gap: 4px;
    height: 4px;
}

.password-strength-bar {
    flex: 1;
    height: 100%;
    background: var(--balam-dark-border-light);
    border-radius: 2px;
    overflow: hidden;
    transition: background-color 0.3s ease;
}

.password-strength-bar .bar-fill {
    width: 0;
    height: 100%;
    border-radius: 2px;
    transition: width 0.3s ease, background-color 0.3s ease;
}

/* Strength Levels */

/* Empty/None */
.password-strength[data-strength="none"] .password-strength-text {
    color: var(--balam-dark-text-muted);
}

/* Weak (1 bar - red) */
.password-strength[data-strength="weak"] .password-strength-text {
    color: var(--balam-danger);
}

.password-strength[data-strength="weak"] .password-strength-bar:nth-child(1) .bar-fill {
    width: 100%;
    background: var(--balam-danger);
}

/* Fair (2 bars - orange) */
.password-strength[data-strength="fair"] .password-strength-text {
    color: var(--balam-warning);
}

.password-strength[data-strength="fair"] .password-strength-bar:nth-child(-n+2) .bar-fill {
    width: 100%;
    background: var(--balam-warning);
}

/* Good (3 bars - yellow-green) */
.password-strength[data-strength="good"] .password-strength-text {
    color: #84cc16;
}

.password-strength[data-strength="good"] .password-strength-bar:nth-child(-n+3) .bar-fill {
    width: 100%;
    background: #84cc16;
}

/* Strong (4 bars - green) */
.password-strength[data-strength="strong"] .password-strength-text {
    color: var(--balam-success);
}

.password-strength[data-strength="strong"] .password-strength-bar .bar-fill {
    width: 100%;
    background: var(--balam-success);
}

/* Password Requirements List */
.password-requirements {
    margin-top: 0.75rem;
    padding: 0.75rem;
    background: var(--balam-dark-bg-tertiary);
    border-radius: 8px;
    font-size: 0.75rem;
}

.password-requirements-title {
    color: var(--balam-dark-text-secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.password-requirements-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 0.25rem;
}

.password-requirement {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--balam-dark-text-muted);
    transition: color 0.2s ease;
}

.password-requirement-icon {
    width: 14px;
    height: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.password-requirement-icon::before {
    content: '';
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid var(--balam-dark-border-light);
    background: transparent;
    transition: all 0.2s ease;
}

/* Met requirement - show check mark with green circle */
.password-requirement.is-met {
    color: var(--balam-success);
}

.password-requirement.is-met .password-requirement-icon::before {
    border-color: var(--balam-success);
    background: var(--balam-success);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
    background-size: 8px 8px;
    background-position: center;
    background-repeat: no-repeat;
    transform: scale(1.05);
}

/* =============================================================================
   INPUT STATES
   ============================================================================= */

/* -----------------------------------------------------------------------------
   Focus State Enhancement
   ----------------------------------------------------------------------------- */

/* General form control focus - enhanced accessibility */
.form-control:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(var(--balam-primary-rgb), 0.25);
    border-color: var(--balam-primary);
}

/* Focus-visible for keyboard navigation */
.form-control:focus-visible {
    outline: 2px solid var(--balam-primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 3px rgba(var(--balam-primary-rgb), 0.25);
}

/* Auth-specific focus */
.auth-form .form-control:focus {
    outline: none;
}

/* -----------------------------------------------------------------------------
   Hover State Enhancement
   ----------------------------------------------------------------------------- */

.auth-form .form-control:not(:focus):not(.is-invalid):not(.is-valid):hover {
    border-color: var(--balam-dark-border-hover);
    background: var(--balam-dark-bg-tertiary);
}

/* -----------------------------------------------------------------------------
   Active State (Being Typed In)
   ----------------------------------------------------------------------------- */

.auth-form .form-control:active:not(:focus) {
    border-color: var(--balam-primary);
}

/* =============================================================================
   DISABLED STATE
   ============================================================================= */

.form-control:disabled,
.form-control.is-disabled,
.auth-form .form-control:disabled,
.auth-form .form-control.is-disabled {
    background: var(--balam-dark-bg-primary) !important;
    border-color: var(--balam-dark-border) !important;
    color: var(--balam-dark-text-faint) !important;
    cursor: not-allowed;
    opacity: 0.6;
}

.form-control:disabled::placeholder,
.form-control.is-disabled::placeholder {
    color: var(--balam-dark-text-faint) !important;
}

/* Disabled input group */
.input-group:has(.form-control:disabled) .input-group-text,
.input-group:has(.form-control.is-disabled) .input-group-text {
    background: var(--balam-dark-bg-primary) !important;
    border-color: var(--balam-dark-border) !important;
    color: var(--balam-dark-text-faint) !important;
    cursor: not-allowed;
    opacity: 0.6;
}

/* Disabled button */
.btn:disabled,
.btn.is-disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* =============================================================================
   FORM FIELD WRAPPER
   ============================================================================= */

.form-field {
    margin-bottom: 1rem;
}

.form-field:last-child {
    margin-bottom: 0;
}

.form-field-hint {
    font-size: 0.75rem;
    color: var(--balam-dark-text-muted);
    margin-top: 0.375rem;
}

/* =============================================================================
   CHARACTER COUNTER
   ============================================================================= */

.char-counter {
    display: flex;
    justify-content: flex-end;
    font-size: 0.75rem;
    color: var(--balam-dark-text-muted);
    margin-top: 0.375rem;
}

.char-counter.is-warning {
    color: var(--balam-warning);
}

.char-counter.is-error {
    color: var(--balam-danger);
}

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

.form-validation-summary {
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: 12px;
    background: rgba(var(--balam-danger-rgb), 0.1);
    border: 1px solid rgba(var(--balam-danger-rgb), 0.2);
    animation: formFadeIn 0.3s ease-out;
}

.form-validation-summary-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: #f87171;
    margin-bottom: 0.5rem;
}

.form-validation-summary-title i {
    font-size: 1rem;
}

.form-validation-summary-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.form-validation-summary-list li {
    font-size: 0.8125rem;
    color: #fca5a5;
    padding: 0.25rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.form-validation-summary-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #f87171;
}

/* =============================================================================
   RESPONSIVE ADJUSTMENTS
   ============================================================================= */

@media (max-width: 575.98px) {
    .password-strength-bars {
        height: 3px;
    }

    .password-requirements {
        padding: 0.5rem;
    }

    .form-feedback,
    .invalid-feedback,
    .valid-feedback {
        font-size: 0.75rem;
        padding: 0.25rem 0.5rem;
    }
}