/* CSS Variables for theming */
:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --secondary-color: #6B7280;
    --secondary-hover: #4B5563;
    --success-color: #10B981;
    --success-hover: #059669;
    --danger-color: #EF4444;
    --danger-hover: #DC2626;
    --warning-color: #F59E0B;

    --bg-primary: #F9FAFB;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F3F4F6;

    --text-primary: #111827;
    --text-secondary: #4B5563;
    --text-muted: #9CA3AF;

    --border-color: #E5E7EB;
    --border-radius: 8px;
    --border-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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --transition: all 0.2s ease;

    --header-height: 64px;
    --sidebar-width: 320px;
    --footer-height: 60px;
}

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

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

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

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 1.5rem;
    max-width: 1920px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    height: 36px;
    width: auto;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-actions {
    display: flex;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

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

.btn .icon {
    font-size: 1rem;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-large {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

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

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

.btn-success:hover:not(:disabled) {
    background: var(--success-hover);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--danger-hover);
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1rem;
    font-weight: 600;
}

.steps-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
}

.empty-state {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
}

.empty-state .hint {
    font-size: 0.8125rem;
    margin-top: 0.5rem;
}

.step-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.875rem;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.step-item:hover {
    background: var(--border-color);
}

.step-item.active {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.05);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 0.8125rem;
    font-weight: 600;
    flex-shrink: 0;
}

.step-info {
    flex: 1;
    min-width: 0;
}

.step-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.step-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.step-actions {
    display: flex;
    gap: 0.25rem;
    opacity: 0;
    transition: var(--transition);
}

.step-item:hover .step-actions {
    opacity: 1;
}

.step-action-btn {
    padding: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    border-radius: 4px;
    transition: var(--transition);
}

.step-action-btn:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.sidebar-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Editor Panel */
.editor-panel {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    background: var(--bg-primary);
}

.welcome-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100%;
}

.welcome-content {
    max-width: 640px;
    text-align: center;
    padding: 2rem;
}

.welcome-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.welcome-content > p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.feature-list {
    text-align: left;
    margin-bottom: 2rem;
}

.feature-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    margin-bottom: 0.75rem;
    border: 1px solid var(--border-color);
}

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

.feature-item h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.feature-item p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* Editor Screen */
.editor-screen {
    max-width: 800px;
    margin: 0 auto;
}

.editor-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.editor-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.section-header h3 {
    margin-bottom: 0;
}

/* Form Elements */
.form-group {
    margin-bottom: 1rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group input[type="color"] {
    width: 60px;
    height: 36px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
}

.form-group .hint {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 120px;
    gap: 1rem;
}

.interaction-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.radio-option,
.checkbox-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    cursor: pointer;
}

.radio-option input,
.checkbox-option input {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color);
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.empty-editor {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    color: var(--text-muted);
}

/* Preview Panel */
.preview-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.preview-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.preview-container {
    flex: 1;
    padding: 1rem;
    overflow: auto;
}

.preview-frame {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    min-height: 400px;
    position: relative;
    overflow: hidden;
}

/* Demo App (for preview) */
.demo-app {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.demo-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    background: #1F2937;
    color: white;
}

.demo-logo {
    font-weight: 600;
    font-size: 1.125rem;
}

.demo-nav {
    display: flex;
    gap: 0.5rem;
}

.demo-nav-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    color: #D1D5DB;
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition);
}

.demo-nav-btn:hover {
    background: #374151;
    color: white;
}

.demo-menu-btn {
    background: #374151;
}

.demo-content {
    padding: 2rem;
}

.demo-content h2 {
    margin-bottom: 0.75rem;
}

.demo-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.demo-form {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.demo-input {
    flex: 1;
    max-width: 300px;
    padding: 0.625rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

.demo-btn {
    padding: 0.625rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
}

.demo-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.demo-card {
    padding: 1.5rem;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.demo-card:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.demo-card h4 {
    margin-bottom: 0.5rem;
}

.demo-card p {
    font-size: 0.875rem;
    margin-bottom: 0;
}

/* Preview Progress */
.preview-progress {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.progress-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Tutorial Overlay */
.tutorial-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    pointer-events: none;
}

.overlay-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    pointer-events: auto;
}

.highlight-box {
    position: absolute;
    border-radius: 4px;
    pointer-events: none;
    z-index: 10000;
    transition: all 0.3s ease;
}

.highlight-box.spotlight {
    box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.5);
    background: transparent;
}

.highlight-box.outline {
    border: 3px solid var(--primary-color);
    box-shadow: 0 0 20px rgba(79, 70, 229, 0.5);
}

.highlight-box.pulse {
    border: 3px solid var(--primary-color);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(79, 70, 229, 0.4);
    }
    50% {
        box-shadow: 0 0 0 15px rgba(79, 70, 229, 0);
    }
}

.highlight-box.arrow::after {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    border-left: 15px solid transparent;
    border-right: 15px solid transparent;
    border-top: 20px solid var(--primary-color);
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
}

/* Tutorial Tooltip */
.tutorial-tooltip {
    position: absolute;
    width: 320px;
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 10001;
    pointer-events: auto;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tooltip-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.step-indicator {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

.tooltip-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.tooltip-close:hover {
    color: var(--text-primary);
}

.tooltip-title {
    font-size: 1rem;
    font-weight: 600;
    padding: 1rem 1rem 0.5rem;
}

.tooltip-content {
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 0 1rem 1rem;
    line-height: 1.6;
}

.tooltip-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 560px;
    max-height: 90vh;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    animation: modalSlide 0.2s ease;
}

@keyframes modalSlide {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

.export-preview {
    margin-top: 1rem;
}

.export-preview label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.code-preview {
    background: #1F2937;
    color: #E5E7EB;
    padding: 1rem;
    border-radius: var(--border-radius);
    font-size: 0.75rem;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    max-height: 200px;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: white;
    padding: 0.875rem 1.5rem;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    box-shadow: var(--shadow-lg);
    z-index: 10002;
    animation: toastSlide 0.3s ease;
}

@keyframes toastSlide {
    from {
        opacity: 0;
        transform: translate(-50%, 20px);
    }
    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--danger-color);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-content {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        max-height: 300px;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .preview-panel {
        border-left: none;
        border-top: 1px solid var(--border-color);
    }

    .demo-cards {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }

    .header-content {
        padding: 0 1rem;
    }

    .logo h1 {
        font-size: 1rem;
    }

    .nav-actions {
        gap: 0.5rem;
    }

    .btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.8125rem;
    }

    .btn .icon + span {
        display: none;
    }

    .sidebar-header {
        padding: 0.75rem 1rem;
    }

    .steps-list {
        padding: 0.5rem;
    }

    .editor-panel {
        padding: 1rem;
    }

    .editor-section {
        padding: 1rem;
    }

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

    .demo-cards {
        grid-template-columns: 1fr;
    }

    .demo-form {
        flex-direction: column;
    }

    .demo-input {
        max-width: 100%;
    }

    .tutorial-tooltip {
        width: 90%;
        max-width: 320px;
    }

    .feature-item {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .welcome-content {
        padding: 1rem;
    }

    .welcome-content h2 {
        font-size: 1.5rem;
    }

    .modal-content {
        width: 95%;
        margin: 1rem;
    }

    .modal-body {
        padding: 1rem;
    }
}

/* Dark mode support (optional - follows system preference) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #111827;
        --bg-secondary: #1F2937;
        --bg-tertiary: #374151;

        --text-primary: #F9FAFB;
        --text-secondary: #D1D5DB;
        --text-muted: #9CA3AF;

        --border-color: #374151;
    }

    .form-group input[type="text"],
    .form-group input[type="email"],
    .form-group textarea,
    .form-group select {
        background: var(--bg-tertiary);
        border-color: #4B5563;
    }

    .demo-input {
        background: var(--bg-tertiary);
        border-color: #4B5563;
        color: var(--text-primary);
    }

    .tutorial-tooltip {
        background: var(--bg-secondary);
    }

    .code-preview {
        background: #0F172A;
    }
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}