/* Reset and Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-primary: #333333;
    --color-secondary: #666666;
    --color-accent: #0066CC;
    --color-background: #f5f5f5;
    --color-surface: #ffffff;
    --color-border: #e0e0e0;
    --color-success: #28a745;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --border-radius: 8px;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-background);
    color: var(--color-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

header h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    color: var(--color-secondary);
    font-size: 1rem;
}

/* Main Content - Two Column Layout */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* Sections */
.form-section,
.preview-section {
    background: var(--color-surface);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.form-section h2,
.preview-section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group input[type="url"] {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-group input:disabled {
    background-color: #f9f9f9;
    color: var(--color-secondary);
    cursor: not-allowed;
}

.required {
    color: #dc3545;
}

/* Optional Section */
.optional-section {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.optional-section h3 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.optional-field .toggle-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.optional-field .toggle-row label:last-child {
    margin-bottom: 0;
}

/* Toggle Switch */
.toggle {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
    flex-shrink: 0;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border);
    transition: 0.2s;
    border-radius: 22px;
}

.toggle-slider::before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.2s;
    border-radius: 50%;
}

.toggle input:checked+.toggle-slider {
    background-color: var(--color-accent);
}

.toggle input:checked+.toggle-slider::before {
    transform: translateX(18px);
}

/* Locked Section */
.locked-section {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.locked-section .form-group {
    position: relative;
}

.locked-input {
    padding-right: 40px !important;
}

.lock-icon {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.875rem;
}

/* Info Note */
.info-note {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: #f0f7ff;
    border: 1px solid #c6e0ff;
    border-radius: var(--border-radius);
}

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

/* Preview Section */
.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.preview-header h2 {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

/* Preview Container */
.preview-container {
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    min-height: 200px;
    background-color: #ffffff;
    color: #333333;
}

/* Actions */
.actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.copy-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    background-color: var(--color-accent);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s;
}

.copy-btn:hover {
    background-color: #0055aa;
}

.copy-btn:active {
    transform: scale(0.98);
}

.copy-status {
    font-size: 0.875rem;
    color: var(--color-success);
    opacity: 0;
    transition: opacity 0.3s;
}

.copy-status.show {
    opacity: 1;
}

/* Instructions */
.instructions {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.instructions h3 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.instructions ol {
    padding-left: var(--spacing-lg);
    font-size: 0.875rem;
    color: var(--color-secondary);
}

.instructions li {
    margin-bottom: var(--spacing-xs);
}

.instructions ul {
    margin-top: var(--spacing-xs);
    margin-left: var(--spacing-md);
    padding-left: var(--spacing-md);
    list-style-type: disc;
}

.instructions ul li {
    margin-bottom: 4px;
}

.instructions .tip {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: #f0f7ff;
    border-left: 3px solid var(--color-accent);
    font-size: 0.875rem;
    color: var(--color-secondary);
    border-radius: 4px;
}

/* Signature Styles (for preview) */
#signature-preview {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

.signature-table {
    border-collapse: collapse;
    border-spacing: 0;
}

.signature-logo-cell {
    vertical-align: top;
    padding-right: 16px;
}

.signature-info-cell {
    vertical-align: top;
}

.signature-name {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
    line-height: 1.3;
}

.signature-title {
    font-size: 14px;
    margin: 2px 0 0 0;
    line-height: 1.3;
}

.signature-contact {
    margin-top: 12px;
    font-size: 13px;
    line-height: 1.6;
}

.signature-contact-row {
    margin: 0;
}

.signature-label {
    display: inline;
}

.signature-link {
    text-decoration: none;
    color: #0066CC;
}

/* Empty State */
.empty-state {
    text-align: center;
    color: var(--color-secondary);
    padding: var(--spacing-xl);
}

.empty-state p {
    font-size: 0.875rem;
}