/* ============================================
   ENHANCED FORM SYSTEM - Kids Learning Platform
   ============================================ */

/* Form Container */
.form {
    width: 100%;
}

/* Form Group */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group-sm {
    margin-bottom: 1rem;
}

.form-group-lg {
    margin-bottom: 2rem;
}

/* Labels */
.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-ink-light);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.form-label-required::after {
    content: ' *';
    color: var(--color-error);
}

/* Input Fields */
.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    font-family: inherit;
    color: var(--color-ink);
    background: white;
    border: 1.5px solid #cbd5e1;
    border-radius: var(--border-radius-input);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: var(--touch-target-min);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--color-ink-muted);
    opacity: 0.6;
}

/* Focus States (using :focus-visible for accessibility) */
.form-input:focus-visible,
.form-textarea:focus-visible,
.form-select:focus-visible {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(107, 151, 196, 0.15);
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* Hover State */
.form-input:hover:not(:disabled):not(:focus),
.form-textarea:hover:not(:disabled):not(:focus),
.form-select:hover:not(:disabled):not(:focus) {
    border-color: #94a3b8;
}

/* Error State */
.form-input.error,
.form-textarea.error,
.form-select.error {
    border-color: var(--color-error);
    background: rgba(239, 68, 68, 0.02);
}

.form-input.error:focus-visible,
.form-textarea.error:focus-visible,
.form-select.error:focus-visible {
    border-color: var(--color-error);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
    outline-color: var(--color-error);
}

/* Success State */
.form-input.success,
.form-textarea.success,
.form-select.success {
    border-color: var(--color-success);
    background: rgba(16, 185, 129, 0.02);
    padding-left: calc(1rem + 1.5rem + 0.5rem);
}

.form-group.success {
    position: relative;
}

.form-group.success::after {
    content: '✓';
    position: absolute;
    left: 1rem;
    top: calc(0.875rem + 1.5rem);
    color: var(--color-success);
    font-weight: 700;
    font-size: 1.25rem;
}

/* Disabled State */
.form-input:disabled,
.form-textarea:disabled,
.form-select:disabled {
    background: #f1f5f9;
    border-color: #e2e8f0;
    color: #94a3b8;
    cursor: not-allowed;
    opacity: 0.7;
}

/* Textarea */
.form-textarea {
    min-height: 120px;
    resize: vertical;
    line-height: 1.6;
}

/* Select */
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: left 1rem center;
    padding-left: 2.5rem;
    cursor: pointer;
}

/* Helper Text */
.form-helper {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-ink-muted);
    margin-top: 0.5rem;
    line-height: 1.4;
}

/* Error Message */
.form-error {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    color: var(--color-error);
    margin-top: 0.5rem;
    font-weight: 500;
    animation: shake 0.3s ease-in-out;
}

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

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
    20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* Success Message */
.form-success {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    color: var(--color-success);
    margin-top: 0.5rem;
    font-weight: 500;
}

.form-success::before {
    content: '✓';
    font-size: 1rem;
    font-weight: 700;
}

/* Checkbox & Radio */
.form-checkbox,
.form-radio {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
    min-height: 44px;
}

.form-checkbox input[type="checkbox"],
.form-radio input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 1.5rem;
    height: 1.5rem;
    cursor: pointer;
}

.form-checkbox-box,
.form-radio-box {
    position: relative;
    width: 1.5rem;
    height: 1.5rem;
    border: 2px solid #cbd5e1;
    background: white;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.form-checkbox-box {
    border-radius: 0.375rem;
}

.form-radio-box {
    border-radius: 50%;
}

/* Checkbox/Radio Checked State */
.form-checkbox input[type="checkbox"]:checked + .form-checkbox-box,
.form-radio input[type="radio"]:checked + .form-radio-box {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    border-color: var(--color-primary);
}

/* Checkmark */
.form-checkbox-box::after {
    content: '';
    position: absolute;
    display: none;
    left: 0.4rem;
    top: 0.15rem;
    width: 0.375rem;
    height: 0.625rem;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.form-checkbox input[type="checkbox"]:checked + .form-checkbox-box::after {
    display: block;
    animation: check-bounce 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes check-bounce {
    0% { transform: rotate(45deg) scale(0); }
    50% { transform: rotate(45deg) scale(1.2); }
    100% { transform: rotate(45deg) scale(1); }
}

/* Radio Dot */
.form-radio-box::after {
    content: '';
    position: absolute;
    display: none;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: white;
}

.form-radio input[type="radio"]:checked + .form-radio-box::after {
    display: block;
    animation: radio-pop 0.2s ease;
}

@keyframes radio-pop {
    0% { transform: translate(-50%, -50%) scale(0); }
    50% { transform: translate(-50%, -50%) scale(1.2); }
    100% { transform: translate(-50%, -50%) scale(1); }
}

/* Focus State for Checkbox/Radio */
.form-checkbox input[type="checkbox"]:focus-visible + .form-checkbox-box,
.form-radio input[type="radio"]:focus-visible + .form-radio-box {
    box-shadow: 0 0 0 4px rgba(107, 151, 196, 0.15);
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Checkbox/Radio Label */
.form-checkbox-label,
.form-radio-label {
    font-size: 0.9375rem;
    color: var(--color-ink);
    line-height: 1.5;
}

/* Toggle Switch */
.form-toggle {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    user-select: none;
}

.form-toggle input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 3rem;
    height: 1.75rem;
    cursor: pointer;
}

.form-toggle-track {
    position: relative;
    width: 3rem;
    height: 1.75rem;
    background: #cbd5e1;
    border-radius: 9999px;
    transition: background 0.25s ease;
}

.form-toggle-knob {
    position: absolute;
    top: 0.25rem;
    left: 0.25rem;
    width: 1.25rem;
    height: 1.25rem;
    background: white;
    border-radius: 50%;
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.form-toggle input[type="checkbox"]:checked + .form-toggle-track {
    background: var(--color-primary);
}

.form-toggle input[type="checkbox"]:checked + .form-toggle-track .form-toggle-knob {
    transform: translateX(1.25rem);
}

.form-toggle input[type="checkbox"]:focus-visible + .form-toggle-track {
    box-shadow: 0 0 0 4px rgba(107, 151, 196, 0.15);
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Input Group (with icons/buttons) */
.form-input-group {
    position: relative;
    display: flex;
}

.form-input-group .form-input {
    flex: 1;
}

.form-input-icon-left {
    padding-right: calc(1rem + 1.5rem + 0.5rem);
}

.form-input-icon-right {
    padding-left: calc(1rem + 1.5rem + 0.5rem);
}

.form-input-group-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-ink-muted);
    pointer-events: none;
    font-size: 1.25rem;
}

.form-input-group-icon-left {
    right: 1rem;
}

.form-input-group-icon-right {
    left: 1rem;
}

/* Password Visibility Toggle */
.form-password-toggle {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-ink-muted);
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease;
}

.form-password-toggle:hover {
    color: var(--color-ink);
}

/* Search Input with Icon */
.form-search {
    position: relative;
    display: flex;
    align-items: center;
}

.form-search .form-input {
    padding-right: 3rem;
}

.form-search-icon {
    position: absolute;
    right: 1rem;
    color: var(--color-ink-muted);
    pointer-events: none;
    font-size: 1rem;
}

/* Quantity Stepper */
.form-quantity {
    display: inline-flex;
    align-items: center;
    border: 1.5px solid #cbd5e1;
    border-radius: var(--border-radius-input);
    overflow: hidden;
}

.form-quantity-btn {
    width: 2.75rem;
    height: 2.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border: none;
    color: var(--color-ink);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1.25rem;
    font-weight: 600;
}

.form-quantity-btn:hover:not(:disabled) {
    background: rgba(107, 151, 196, 0.05);
    color: var(--color-primary);
}

.form-quantity-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.form-quantity-input {
    width: 4rem;
    height: 2.75rem;
    border: none;
    border-right: 1.5px solid #cbd5e1;
    border-left: 1.5px solid #cbd5e1;
    text-align: center;
    font-weight: 600;
    color: var(--color-ink);
    font-size: 1rem;
}

/* Search Input */
.form-search {
    position: relative;
}

.form-search .form-input {
    padding-right: 3rem;
}

.form-search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-ink-muted);
    pointer-events: none;
}

/* Form Layout - Two Columns */
.form-row {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: 1fr 1fr;
}

.form-row-3 {
    grid-template-columns: 1fr 1fr 1fr;
}

/* Fieldset */
.form-fieldset {
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius-card);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-legend {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-ink);
    padding: 0 0.5rem;
}

/* Quantity Stepper */
.form-stepper {
    display: inline-flex;
    align-items: center;
    border-radius: var(--border-radius-round);
    border: 1px solid #d8e3f0;
    background: white;
    overflow: hidden;
}

.form-stepper-btn {
    padding: 0.5rem 0.875rem;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-ink);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.form-stepper-btn:hover:not(:disabled) {
    background: var(--color-primary-light) / 0.1);
}

.form-stepper-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.form-stepper-value {
    min-width: 2rem;
    text-align: center;
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-ink);
    padding: 0 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .form-row,
    .form-row-3 {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .form-input,
    .form-textarea,
    .form-select {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .form-input,
    .form-textarea,
    .form-select,
    .form-checkbox-box,
    .form-radio-box,
    .form-toggle-track,
    .form-toggle-knob,
    .form-error {
        transition: none;
        animation: none;
    }
}