/* CSS Variables */
:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-secondary: #64748b;
    --color-secondary-hover: #475569;
    --color-background: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-error: #dc2626;
    --color-success: #16a34a;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

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

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--color-secondary-hover);
}

.btn-text {
    background: transparent;
    color: var(--color-text-muted);
}

.btn-text:hover {
    color: var(--color-text);
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.btn-icon:hover {
    background-color: var(--color-border);
    color: var(--color-text);
}

/* Form */
.vcard-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

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

.form-group input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

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

.form-group input.error {
    border-color: var(--color-error);
}

.form-group .error-message {
    color: var(--color-error);
    font-size: 0.75rem;
    margin-top: var(--spacing-xs);
}

/* Actions */
.actions {
    margin-top: var(--spacing-lg);
}

.actions .btn {
    width: 100%;
}

/* Character Counter */
.char-counter {
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--color-background);
    border-radius: var(--radius-sm);
}

.char-counter .size-warning {
    color: var(--color-error);
    font-weight: 500;
    margin-left: var(--spacing-sm);
}

/* QR Section */
.qr-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.qr-info {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-align: center;
}

.qr-code {
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--radius-md);
}

.qr-code img {
    display: block;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    padding: var(--spacing-md);
    z-index: 100;
}

.modal-content {
    width: 100%;
    max-width: 400px;
    max-height: 80vh;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

.field-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.field-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    background: var(--color-background);
    border-radius: var(--radius-md);
    flex-wrap: wrap;
}

.field-item .drag-handle {
    cursor: grab;
    color: var(--color-text-muted);
}

.field-item .field-info {
    flex: 1;
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    min-width: 150px;
}

.field-item .field-label-input {
    flex: 1;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    min-width: 80px;
}

.field-item .field-label-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.field-item .field-type-select {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    background: white;
}

.field-item .field-required-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    cursor: pointer;
    white-space: nowrap;
}

.field-item .field-required-toggle input {
    width: 14px;
    height: 14px;
    cursor: pointer;
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.modal-actions .btn {
    flex: 1;
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Responsive */
@media (min-width: 640px) {
    .container {
        padding: var(--spacing-xl);
    }

    header h1 {
        font-size: 1.75rem;
    }
}