/* ============================================
   INTELFORM - Main Styles
   Modern AI-inspired form design system
   ============================================ */

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg);
}

@media (max-width: 768px) {
    .container {
        padding: var(--space-xl) var(--space-md);
    }
}

/* ============================================
   THEME TOGGLE
   ============================================ */

.theme-toggle {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: var(--z-sticky);
}

.toggle-btn {
    width: 56px;
    height: 32px;
    border-radius: var(--radius-full);
    border: 2px solid var(--border-primary);
    background: var(--surface-primary);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.toggle-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.toggle-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 16px;
    transition: all var(--transition-base);
}

.toggle-icon.sun {
    left: 6px;
    opacity: 1;
}

.toggle-icon.moon {
    right: 6px;
    opacity: 0;
}

[data-theme="dark"] .toggle-icon.sun {
    opacity: 0;
}

[data-theme="dark"] .toggle-icon.moon {
    opacity: 1;
}

/* ============================================
   HEADER
   ============================================ */

.header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.logo svg {
    color: var(--accent-primary);
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ============================================
   PROGRESS BAR
   ============================================ */

.progress-container {
    margin-bottom: var(--space-2xl);
}

.progress-bar {
    height: 8px;
    background: var(--surface-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-md);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-full);
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    width: 0%;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}

.progress-text {
    color: var(--text-secondary);
    font-weight: 500;
}

.progress-percent {
    color: var(--accent-primary);
    font-weight: 600;
}

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

.form-wrapper {
    position: relative;
}

/* ============================================
   FORM STAGES
   ============================================ */

.form-stage {
    display: none;
    opacity: 0;
    transform: translateY(20px);
}

.form-stage.active {
    display: block;
    animation: slideIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.form-stage.exiting {
    animation: slideOut 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

/* Stage Header */
.stage-header {
    margin-bottom: var(--space-2xl);
}

.stage-number {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-primary);
    background: var(--surface-secondary);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.stage-title {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.stage-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   FORM FIELDS
   ============================================ */

.form-fields {
    margin-bottom: var(--space-2xl);
}

.form-group {
    margin-bottom: var(--space-xl);
}

.form-group label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.form-group label .required {
    color: var(--color-error);
}

/* Text Inputs */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
textarea,
select {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 0.9375rem;
    font-family: var(--font-family);
    color: var(--text-primary);
    background: var(--surface-primary);
    border: 1.5px solid var(--border-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    outline: none;
}

input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="tel"]::placeholder,
input[type="url"]::placeholder,
textarea::placeholder {
    color: var(--text-tertiary);
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--border-focus);
    background: var(--bg-elevated);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

input:hover,
textarea:hover,
select:hover {
    border-color: var(--border-secondary);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

/* Field Hints */
.field-hint {
    display: block;
    margin-top: var(--space-sm);
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* Character Counter */
.char-counter {
    margin-top: var(--space-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.char-counter #charCount {
    font-weight: 600;
    color: var(--accent-primary);
}

.char-counter .recommended {
    color: var(--text-tertiary);
}

/* ============================================
   RADIO GROUPS
   ============================================ */

.radio-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.radio-option {
    cursor: pointer;
}

.radio-option input[type="radio"] {
    display: none;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--surface-primary);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.radio-label:hover {
    border-color: var(--border-secondary);
    background: var(--surface-hover);
}

.radio-option input[type="radio"]:checked + .radio-label {
    border-color: var(--accent-primary);
    background: var(--surface-hover);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.radio-icon {
    font-size: 1.5rem;
}

.radio-text {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* ============================================
   CHECKBOX GROUPS
   ============================================ */

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.checkbox-option {
    cursor: pointer;
}

.checkbox-option input[type="checkbox"] {
    display: none;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--surface-primary);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.checkbox-label::before {
    content: '';
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-secondary);
    border-radius: var(--radius-sm);
    background: var(--surface-primary);
    transition: all var(--transition-base);
}

.checkbox-option input[type="checkbox"]:checked + .checkbox-label::before {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 16 16' fill='white' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M12.207 4.793a1 1 0 010 1.414l-5 5a1 1 0 01-1.414 0l-2-2a1 1 0 011.414-1.414L6.5 9.086l4.293-4.293a1 1 0 011.414 0z'/%3e%3c/svg%3e");
}

.checkbox-label:hover {
    border-color: var(--border-secondary);
    background: var(--surface-hover);
}

.checkbox-option input[type="checkbox"]:checked + .checkbox-label {
    border-color: var(--accent-primary);
    background: var(--surface-hover);
}

.checkbox-label strong {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.checkbox-label small {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.875rem 1.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    font-family: var(--font-family);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    outline: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--surface-primary);
    color: var(--text-primary);
    border: 2px solid var(--border-primary);
}

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

/* AI Help Button */
.ai-help-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    margin-top: var(--space-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent-primary);
    background: transparent;
    border: 1.5px solid var(--accent-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.ai-help-btn:hover:not(:disabled) {
    background: var(--accent-primary);
    color: var(--text-inverse);
    transform: translateY(-1px);
}

.ai-help-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   STAGE NAVIGATION
   ============================================ */

.stage-navigation {
    display: flex;
    justify-content: space-between;
    gap: var(--space-md);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-primary);
}

.stage-navigation .btn {
    min-width: 140px;
}

@media (max-width: 480px) {
    .stage-navigation {
        flex-direction: column-reverse;
    }
    
    .stage-navigation .btn {
        width: 100%;
    }
}

/* ============================================
   INFO BOX
   ============================================ */

.info-box {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-lg);
    margin-top: var(--space-md);
    background: var(--color-info-bg);
    border-left: 3px solid var(--color-info);
    border-radius: var(--radius-md);
}

.info-box svg {
    flex-shrink: 0;
    color: var(--color-info);
}

.info-box strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.info-box p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

/* ============================================
   URL INPUT GROUP
   ============================================ */

.url-input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

/* ============================================
   SUCCESS MESSAGE
   ============================================ */

.success-message {
    text-align: center;
    padding: var(--space-3xl) 0;
}

.success-content {
    max-width: 600px;
    margin: 0 auto;
}

.success-icon {
    margin-bottom: var(--space-xl);
}

.success-icon svg {
    color: var(--color-success);
}

.success-message h2 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.success-message > p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    line-height: 1.7;
}

.success-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
    text-align: left;
}

.detail-item {
    display: flex;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--surface-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
}

.detail-item svg {
    flex-shrink: 0;
    color: var(--accent-primary);
}

.detail-item strong {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.detail-item p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin: 0;
}

.success-footer {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    font-style: italic;
}

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

@media (max-width: 768px) {
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .stage-title {
        font-size: 1.5rem;
    }
    
    .radio-group {
        grid-template-columns: 1fr;
    }
}