/**
 * VirtualNutri+ - Form Styles
 * Estilos modernos e elegantes para formulários
 * Author: Claude Code 2025
 */

/* ========================================
   FORM CONTAINER & LAYOUT
   ======================================== */

.form-container {
    background: var(--brand-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    margin-bottom: 2rem;
}

.form-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--surface-border);
}

.form-header h3 {
    color: var(--brand-primary);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.form-header .form-description {
    color: var(--text-secondary);
    font-size: 0.925rem;
}

.form-section {
    margin-bottom: 2rem;
}

.form-section-title {
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--surface-border);
}

/* ========================================
   FORM GROUPS
   ======================================== */

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.925rem;
}

.form-label .required {
    color: var(--danger);
    margin-left: 0.25rem;
}

.form-label .optional {
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 0.875rem;
    margin-left: 0.5rem;
}

.form-help {
    display: block;
    margin-top: 0.375rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ========================================
   FORM CONTROLS
   ======================================== */

.form-control,
.form-select,
textarea.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--brand-surface);
    border: 2px solid var(--surface-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-control:focus,
.form-select:focus,
textarea.form-control:focus {
    outline: none;
    border-color: var(--brand-secondary);
    box-shadow: 0 0 0 3px rgba(0, 168, 98, 0.15);
}

.form-control:disabled,
.form-select:disabled {
    background-color: var(--surface-hover);
    color: var(--text-disabled);
    cursor: not-allowed;
}

.form-control.is-invalid,
.form-select.is-invalid {
    border-color: var(--danger);
}

.form-control.is-invalid:focus,
.form-select.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(214, 43, 31, 0.15);
}

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

.form-control.is-valid:focus,
.form-select.is-valid:focus {
    box-shadow: 0 0 0 3px rgba(0, 168, 98, 0.15);
}

/* ========================================
   INPUT GROUPS & ADDONS
   ======================================== */

.input-group {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    width: 100%;
}

.input-group .form-control,
.input-group .form-select {
    position: relative;
    flex: 1 1 auto;
    width: 1%;
    min-width: 0;
}

.input-group-text {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-secondary);
    text-align: center;
    white-space: nowrap;
    background-color: var(--surface-hover);
    border: 2px solid var(--surface-border);
    border-radius: var(--radius-md);
}

.input-group > .form-control:not(:last-child),
.input-group > .input-group-text:not(:last-child) {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.input-group > .form-control:not(:first-child),
.input-group > .input-group-text:not(:first-child) {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    margin-left: -2px;
}

/* ========================================
   CHECKBOXES & RADIOS
   ======================================== */

.form-check {
    display: flex;
    align-items: center;
    padding-left: 0;
    margin-bottom: 0.75rem;
}

.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 0.75rem;
    vertical-align: top;
    background-color: var(--brand-surface);
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    border: 2px solid var(--surface-border);
    appearance: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.form-check-input[type="checkbox"] {
    border-radius: var(--radius-sm);
}

.form-check-input[type="radio"] {
    border-radius: 50%;
}

.form-check-input:checked {
    background-color: var(--brand-secondary);
    border-color: var(--brand-secondary);
}

.form-check-input[type="checkbox"]:checked {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='M6 10l3 3l6-6'/%3e%3c/svg%3e");
}

.form-check-input[type="radio"]:checked {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='2' fill='%23fff'/%3e%3c/svg%3e");
}

.form-check-label {
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
}

/* ========================================
   FORM VALIDATION FEEDBACK
   ======================================== */

.invalid-feedback {
    display: none;
    margin-top: 0.375rem;
    font-size: 0.875rem;
    color: var(--danger);
}

.form-control.is-invalid ~ .invalid-feedback,
.form-select.is-invalid ~ .invalid-feedback {
    display: block;
}

.valid-feedback {
    display: none;
    margin-top: 0.375rem;
    font-size: 0.875rem;
    color: var(--success);
}

.form-control.is-valid ~ .valid-feedback,
.form-select.is-valid ~ .valid-feedback {
    display: block;
}

/* ========================================
   FORM BUTTONS & ACTIONS
   ======================================== */

.form-actions {
    display: flex;
    gap: 1rem;
    padding-top: 1.5rem;
    margin-top: 2rem;
    border-top: 1px solid var(--surface-border);
}

.form-actions.centered {
    justify-content: center;
}

.form-actions.right {
    justify-content: flex-end;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    color: #fff;
    background-color: var(--brand-primary);
    border-color: var(--brand-primary);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--brand-accent);
    border-color: var(--brand-accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(29, 209, 161, 0.3);
}

.btn-secondary {
    color: var(--text-primary);
    background-color: var(--surface-hover);
    border-color: var(--surface-border);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--surface-border);
}

.btn-danger {
    color: #fff;
    background-color: var(--danger);
    border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
    background-color: #a03c3c;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-warning {
    color: #fff;
    background-color: var(--warning);
    border-color: var(--warning);
}

.btn-warning:hover:not(:disabled) {
    background-color: #e08d48;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-info {
    color: #fff;
    background-color: var(--info);
    border-color: var(--info);
}

.btn-outline-primary {
    color: var(--brand-secondary);
    background-color: transparent;
    border-color: var(--brand-secondary);
}

.btn-outline-primary:hover:not(:disabled) {
    color: #fff;
    background-color: var(--brand-secondary);
}

.btn-outline-secondary {
    color: var(--text-secondary);
    background-color: transparent;
    border-color: var(--surface-border);
}

.btn-outline-secondary:hover:not(:disabled) {
    color: var(--text-primary);
    background-color: var(--surface-hover);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ========================================
   RESPONSIVE GRID LAYOUT
   ======================================== */

.row {
    display: flex;
    flex-wrap: wrap;
    margin-right: -0.75rem;
    margin-left: -0.75rem;
}

.row.g-3 > * {
    padding-right: 0.75rem;
    padding-left: 0.75rem;
    margin-bottom: 1rem;
}

.col-12 { flex: 0 0 100%; max-width: 100%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }

@media (min-width: 768px) {
    .col-md-12 { flex: 0 0 100%; max-width: 100%; }
    .col-md-6 { flex: 0 0 50%; max-width: 50%; }
    .col-md-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
    .col-md-3 { flex: 0 0 25%; max-width: 25%; }
}

@media (max-width: 767px) {
    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }
}

/* ========================================
   SELECT2 & ADVANCED INPUTS
   ======================================== */

.select2-container {
    width: 100% !important;
}

.select2-container .select2-selection--single {
    height: calc(2.75rem + 4px);
    padding: 0.75rem 1rem;
    border: 2px solid var(--surface-border);
    border-radius: var(--radius-md);
}

.select2-container--default .select2-selection--single .select2-selection__rendered {
    line-height: calc(2.75rem);
    color: var(--text-primary);
}

.select2-container--default.select2-container--focus .select2-selection--single {
    border-color: var(--brand-secondary);
    box-shadow: 0 0 0 3px rgba(0, 168, 98, 0.15);
}

/* ========================================
   FLOATING LABELS
   ======================================== */

.form-floating {
    position: relative;
}

.form-floating > .form-control,
.form-floating > .form-select {
    height: calc(3.5rem + 4px);
    padding: 1rem;
}

.form-floating > label {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    padding: 1rem;
    pointer-events: none;
    border: 2px solid transparent;
    transform-origin: 0 0;
    transition: opacity 0.1s ease-in-out, transform 0.1s ease-in-out;
    color: var(--text-secondary);
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label,
.form-floating > .form-select ~ label {
    opacity: 0.65;
    transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
}

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

.btn.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn.loading::after {
    content: "";
    position: absolute;
    width: 1rem;
    height: 1rem;
    top: 50%;
    left: 50%;
    margin-left: -0.5rem;
    margin-top: -0.5rem;
    border: 2px solid transparent;
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ========================================
   FORM CARDS
   ======================================== */

.card.form-card {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.card.form-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-header {
    background: var(--brand-surface);
    color: var(--text-primary);
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    border-bottom: 1px solid var(--surface-border);
}

.card-header h5,
.card-header h4,
.card-header h3 {
    color: var(--text-primary);
    margin-bottom: 0;
    font-weight: 700;
}

.card-body {
    padding: 1.5rem;
    background-color: var(--brand-surface);
}