/* ============================================
   CSS Forms Styles
   Author: Thomas Butler
   ============================================ */

/* Forms Grid Layout */
.forms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.form-card {
    background: var(--colour-surface);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    border: 1px solid var(--colour-border);
}

.form-card.wide {
    grid-column: span 2;
}

.form-card h3 {
    margin-bottom: var(--space-6);
    color: var(--colour-text);
    font-size: var(--text-xl);
}

/* Demo Form Styles */
.demo-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.form-group {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

/* Labels */
.form-group label {
    font-weight: var(--font-medium);
    color: var(--colour-text);
    font-size: var(--text-sm);
}

/* Base Input Styles */
.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-3);
    background: var(--colour-background);
    border: 2px solid var(--colour-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--text-base);
    color: var(--colour-text);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--colour-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--colour-text-muted);
}

/* Floating Labels */
.form-floating {
    position: relative;
}

.form-floating label {
    position: absolute;
    top: 50%;
    left: var(--space-3);
    transform: translateY(-50%);
    font-size: var(--text-base);
    color: var(--colour-text-muted);
    pointer-events: none;
    transition: all var(--transition-fast);
    background: var(--colour-background);
    padding: 0 var(--space-1);
}

.form-floating .form-input {
    padding-top: var(--space-4);
    padding-bottom: var(--space-2);
}

.form-floating .form-input:focus ~ label,
.form-floating .form-input:not(:placeholder-shown) ~ label {
    top: 0;
    transform: translateY(-50%);
    font-size: var(--text-xs);
    color: var(--colour-primary);
}

/* Underline Style */
.form-underline {
    position: relative;
    padding-top: var(--space-4);
}

.form-underline label {
    position: absolute;
    top: 0;
    left: 0;
    font-size: var(--text-xs);
    color: var(--colour-text-muted);
}

.form-underline .form-input {
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--colour-border);
    border-radius: 0;
    padding-left: 0;
    padding-right: 0;
}

.form-underline-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--colour-primary);
    transition: width var(--transition-base);
}

.form-underline .form-input:focus ~ .form-underline-bar {
    width: 100%;
}

.form-underline .form-input:focus {
    box-shadow: none;
}

/* Icon Inputs */
.form-icon {
    position: relative;
}

.form-icon .form-input {
    padding-left: var(--space-10);
}

.form-icon-left,
.form-icon-right {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--text-lg);
    pointer-events: none;
}

.form-icon-left {
    left: var(--space-3);
}

.form-icon-right {
    right: var(--space-3);
    pointer-events: auto;
}

.password-toggle {
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.password-toggle:hover {
    opacity: 1;
}

/* Textareas */
.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.auto-expand {
    overflow: hidden;
    resize: none;
}

.char-count {
    display: block;
    text-align: right;
    font-size: var(--text-xs);
    color: var(--colour-text-muted);
    margin-top: var(--space-1);
}

/* Select Dropdowns */
.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    background-size: 20px;
    padding-right: var(--space-10);
}

.form-select-wrapper {
    position: relative;
}

.custom-select {
    font-weight: var(--font-medium);
}

/* Validation States */
.form-message {
    font-size: var(--text-sm);
    margin-top: var(--space-1);
    display: none;
}

/* Success State */
.form-group.success .form-input,
.form-group.success .form-textarea {
    border-color: var(--colour-success);
}

.form-group.success .form-message {
    color: var(--colour-success);
    display: block;
}

/* Error State */
.form-group.error .form-input,
.form-group.error .form-textarea {
    border-color: var(--colour-error);
}

.form-group.error .form-message {
    color: var(--colour-error);
    display: block;
}

/* Real-time Validation */
.form-input:valid:not(:placeholder-shown) {
    border-color: var(--colour-success);
}

.form-input:invalid:not(:placeholder-shown):not(:focus) {
    border-color: var(--colour-error);
}

.form-input:valid:not(:placeholder-shown) ~ .form-message::before {
    content: '✓ ';
    color: var(--colour-success);
}

.form-input:invalid:not(:placeholder-shown):not(:focus) ~ .form-message::before {
    content: '✗ ';
    color: var(--colour-error);
}

/* Password Strength Indicator */
.password-strength {
    margin-top: var(--space-2);
    height: 4px;
    background: var(--colour-border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.strength-bar {
    height: 100%;
    width: 0;
    background: var(--colour-error);
    transition: all var(--transition-base);
}

.strength-bar.weak {
    width: 33%;
    background: var(--colour-error);
}

.strength-bar.medium {
    width: 66%;
    background: var(--colour-warning);
}

.strength-bar.strong {
    width: 100%;
    background: var(--colour-success);
}

/* Password Requirements */
.password-requirements {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-2);
}

.requirement {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-2);
    background: var(--colour-surface-alt);
    border-radius: var(--radius-md);
    color: var(--colour-text-muted);
    transition: all var(--transition-fast);
}

.requirement.met {
    background: var(--colour-success);
    color: white;
}

/* Checkboxes */
.checkbox-wrapper {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.form-checkbox {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkbox-mark {
    width: 20px;
    height: 20px;
    background: var(--colour-background);
    border: 2px solid var(--colour-border);
    border-radius: var(--radius-sm);
    margin-right: var(--space-3);
    position: relative;
    transition: all var(--transition-fast);
}

.checkbox-mark::after {
    content: '';
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.form-checkbox:checked ~ .checkbox-mark {
    background: var(--colour-primary);
    border-color: var(--colour-primary);
}

.form-checkbox:checked ~ .checkbox-mark::after {
    display: block;
}

.checkbox-wrapper:hover .checkbox-mark {
    border-color: var(--colour-primary);
}

.checkbox-label {
    color: var(--colour-text);
}

/* Fancy Checkbox Animation */
.checkbox-fancy .checkbox-mark {
    border-radius: 50%;
}

.checkbox-fancy .form-checkbox:checked ~ .checkbox-mark {
    animation: checkbox-pop 0.3s ease-out;
}

@keyframes checkbox-pop {
    0% { transform: scale(1); }
    50% { transform: scale(1.3); }
    100% { transform: scale(1); }
}

/* Radio Buttons */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.radio-wrapper {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.form-radio {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.radio-mark {
    width: 20px;
    height: 20px;
    background: var(--colour-background);
    border: 2px solid var(--colour-border);
    border-radius: 50%;
    margin-right: var(--space-3);
    position: relative;
    transition: all var(--transition-fast);
}

.radio-mark::after {
    content: '';
    position: absolute;
    display: none;
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.form-radio:checked ~ .radio-mark {
    background: var(--colour-primary);
    border-color: var(--colour-primary);
}

.form-radio:checked ~ .radio-mark::after {
    display: block;
}

.radio-wrapper:hover .radio-mark {
    border-color: var(--colour-primary);
}

.radio-label {
    color: var(--colour-text);
}

/* Toggle Switches */
.toggle-wrapper {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.form-toggle {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.toggle-slider {
    width: 48px;
    height: 24px;
    background: var(--colour-border);
    border-radius: var(--radius-full);
    margin-right: var(--space-3);
    position: relative;
    transition: all var(--transition-fast);
}

.toggle-slider::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: all var(--transition-fast);
}

.form-toggle:checked ~ .toggle-slider {
    background: var(--colour-primary);
}

.form-toggle:checked ~ .toggle-slider::after {
    transform: translateX(24px);
}

.toggle-label {
    color: var(--colour-text);
}

/* Fancy Toggle */
.toggle-fancy .toggle-slider {
    width: 60px;
    height: 30px;
}

.toggle-fancy .toggle-slider::after {
    width: 24px;
    height: 24px;
}

.toggle-fancy .form-toggle:checked ~ .toggle-slider::after {
    transform: translateX(30px);
}

.toggle-fancy .toggle-slider::before {
    content: '☀️';
    position: absolute;
    left: 5px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
}

.toggle-fancy .form-toggle:checked ~ .toggle-slider::before {
    content: '🌙';
    left: auto;
    right: 5px;
}

/* Range Sliders */
.form-range {
    width: 100%;
    height: 6px;
    background: var(--colour-border);
    border-radius: var(--radius-full);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--colour-primary);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.form-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--colour-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
}

.form-range:hover::-webkit-slider-thumb {
    transform: scale(1.2);
    box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.1);
}

.form-range:hover::-moz-range-thumb {
    transform: scale(1.2);
    box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.1);
}

.range-value {
    display: inline-block;
    margin-left: var(--space-3);
    font-weight: var(--font-medium);
    color: var(--colour-primary);
}

/* Custom Range Styles */
.range-custom {
    background: linear-gradient(to right, var(--colour-primary) 0%, var(--colour-border) 0%);
}

.range-gradient {
    background: linear-gradient(to right, 
        #3b82f6 0%, 
        #8b5cf6 25%, 
        #ec4899 50%, 
        #ef4444 75%, 
        #f59e0b 100%
    );
}

/* File Upload */
.file-upload {
    display: block;
    cursor: pointer;
}

.form-file {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.file-button {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--colour-primary);
    color: white;
    border-radius: var(--radius-md);
    font-weight: var(--font-medium);
    transition: all var(--transition-fast);
}

.file-button:hover {
    background: var(--colour-primary-dark);
    transform: translateY(-2px);
}

.file-icon {
    font-size: var(--text-xl);
}

.file-name {
    display: block;
    margin-top: var(--space-2);
    font-size: var(--text-sm);
    color: var(--colour-text-muted);
}

/* File Drop Area */
.file-drop {
    width: 100%;
}

.file-drop-area {
    padding: var(--space-8);
    background: var(--colour-background);
    border: 2px dashed var(--colour-border);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-fast);
}

.file-drop-area:hover {
    border-color: var(--colour-primary);
    background: var(--colour-surface-alt);
}

.file-drop.drag-over .file-drop-area {
    border-color: var(--colour-primary);
    background: rgba(37, 99, 235, 0.05);
}

.file-drop-icon {
    display: block;
    font-size: 3rem;
    margin-bottom: var(--space-3);
}

.file-drop-text {
    display: block;
    font-weight: var(--font-medium);
    color: var(--colour-text);
    margin-bottom: var(--space-2);
}

.file-drop-hint {
    display: block;
    font-size: var(--text-sm);
    color: var(--colour-text-muted);
}

/* Date & Time Inputs */
input[type="date"],
input[type="time"],
input[type="datetime-local"] {
    cursor: pointer;
}

input[type="date"]::-webkit-calendar-picker-indicator,
input[type="time"]::-webkit-calendar-picker-indicator,
input[type="datetime-local"]::-webkit-calendar-picker-indicator {
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

input[type="date"]:hover::-webkit-calendar-picker-indicator,
input[type="time"]:hover::-webkit-calendar-picker-indicator,
input[type="datetime-local"]:hover::-webkit-calendar-picker-indicator {
    opacity: 1;
}

/* Complete Form Styles */
.form-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.form-header h4 {
    margin-bottom: var(--space-2);
    color: var(--colour-text);
}

.form-header p {
    color: var(--colour-text-muted);
}

.form-footer {
    text-align: center;
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--colour-border);
}

.form-footer p {
    color: var(--colour-text-muted);
}

.form-footer a {
    color: var(--colour-primary);
    text-decoration: none;
    font-weight: var(--font-medium);
}

.form-footer a:hover {
    text-decoration: underline;
}

/* Button Styles */
.btn-block {
    width: 100%;
}

/* Dark Theme Adjustments */
[data-theme="dark"] .form-card {
    background: var(--colour-surface);
}

[data-theme="dark"] .form-input,
[data-theme="dark"] .form-textarea,
[data-theme="dark"] .form-select {
    background: var(--colour-surface-alt);
}

[data-theme="dark"] .form-floating label {
    background: var(--colour-surface-alt);
}

[data-theme="dark"] .checkbox-mark,
[data-theme="dark"] .radio-mark {
    background: var(--colour-surface-alt);
}

/* Responsive */
@media (max-width: 768px) {
    .forms-grid {
        grid-template-columns: 1fr;
    }
    
    .form-card.wide {
        grid-column: span 1;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .password-requirements {
        flex-direction: column;
    }
    
    .requirement {
        width: 100%;
        text-align: center;
    }
}