/* ===========================
   Design System & Variables
   =========================== */
:root {
    /* Colors */
    --color-bg: #ffffff;
    --color-surface: #f8f9fa;
    --color-surface-hover: #f1f3f5;
    --color-border: #e9ecef;
    --color-border-light: #f1f3f5;

    --color-text-primary: #212529;
    --color-text-secondary: #6c757d;
    --color-text-tertiary: #adb5bd;

    --color-primary: #000000;
    --color-primary-hover: #1a1a1a;
    --color-primary-light: #f5f5f5;

    --color-success: #10b981;
    --color-error: #ef4444;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-heading: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background: var(--color-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    transition: all var(--transition-base);
}

input,
textarea,
select {
    font-family: inherit;
    font-size: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-family-heading);
}

/* ===========================
   Layout
   =========================== */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ===========================
   Chat Panel (Left Side)
   =========================== */
.chat-panel {
    width: 400px;
    min-width: 300px;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    position: relative;
}

.resize-handle {
    position: absolute;
    top: 0;
    right: 0;
    width: 5px;
    height: 100%;
    cursor: col-resize;
    background: transparent;
    z-index: 100;
    transition: background var(--transition-fast);
}

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

.resize-handle.resizing {
    background: var(--color-primary);
}

.chat-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.app-logo {
    height: 32px;
    width: auto;
    object-fit: contain;
}

.beta-tag {
    font-family: var(--font-family-heading);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: 3px 8px;
    background: var(--color-primary);
    color: white;
    border-radius: 12px;
    text-transform: uppercase;
}

.header-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.icon-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.icon-btn:hover {
    background: var(--color-surface);
    color: var(--color-text-primary);
    transform: scale(1.05);
}

/* History Sidebar */
.history-sidebar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-bg);
    z-index: 10;
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    transition: transform var(--transition-base);
}

.history-sidebar.active {
    transform: translateX(0);
}

.history-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.history-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

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

.history-list::-webkit-scrollbar {
    width: 6px;
}

.history-list::-webkit-scrollbar-track {
    background: transparent;
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.empty-history {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-tertiary);
}

.history-item {
    padding: var(--spacing-md);
    border-radius: 12px;
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    border: 1px solid transparent;
    position: relative;
}

.history-item:hover {
    background: var(--color-surface);
    border-color: var(--color-border);
    transform: translateX(4px);
}

.history-item.active {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
}

.history-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
}

.history-item-title {
    font-weight: 500;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item-delete {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-tertiary);
    opacity: 0;
    transition: all var(--transition-base);
}

.history-item:hover .history-item-delete {
    opacity: 1;
}

.history-item-delete:hover {
    background: var(--color-error);
    color: white;
    transform: scale(1.1);
}

.history-item-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}

.welcome-message {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-md);
}

.welcome-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-lg);
    background: var(--color-primary-light);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
}

.welcome-logo {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.welcome-message h2 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.welcome-message p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.welcome-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-2xl);
}

.content-section {
    margin: var(--spacing-2xl) 0;
    text-align: left;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.content-section h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.content-section p {
    font-size: var(--font-size-base);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-2xl) 0;
    text-align: left;
}

.feature-card {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.feature-card h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.steps-list {
    list-style: none;
    counter-reset: step-counter;
    padding-left: 0;
}

.steps-list li {
    counter-increment: step-counter;
    position: relative;
    padding-left: 3.5rem;
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.steps-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0;
    width: 2.5rem;
    height: 2.5rem;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.use-cases {
    display: grid;
    gap: var(--spacing-md);
}

.use-case {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
    line-height: 1.7;
    transition: all var(--transition-base);
}

.use-case:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.use-case strong {
    color: var(--color-primary);
    font-weight: 600;
}

.tips-list {
    list-style: none;
    padding-left: 0;
}

.tips-list li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.tips-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.tips-list strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.cta-section {
    margin: var(--spacing-2xl) 0;
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-surface) 100%);
    border-radius: var(--radius-xl);
    text-align: center;
}

.cta-section h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.cta-section p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.example-prompts {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 600px;
    margin: 0 auto;
}

.prompt-example {
    background: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
    cursor: pointer;
}

.prompt-example:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}


.message {
    display: flex;
    gap: var(--spacing-md);
    animation: messageSlideIn var(--transition-base);
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.message.user .message-avatar {
    background: var(--color-primary);
    color: white;
}

.message.assistant .message-avatar {
    background: var(--color-surface);
    color: var(--color-text-secondary);
}

.message-content {
    flex: 1;
    padding-top: var(--spacing-xs);
}

.message-text {
    color: var(--color-text-primary);
    line-height: 1.6;
    word-wrap: break-word;
}

.message-images {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
}

.message-image {
    max-width: 200px;
    max-height: 200px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform var(--transition-base);
}

.message-image:hover {
    transform: scale(1.02);
}

.message-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--spacing-xs);
}

.message.assistant .message-text {
    background: var(--color-surface);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 16px;
}

.loading-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-md) var(--spacing-lg);
}

.loading-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-text-tertiary);
    animation: loadingBounce 1.4s infinite ease-in-out both;
}

.loading-dot:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dot:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes loadingBounce {

    0%,
    80%,
    100% {
        transform: scale(0.8);
        opacity: 0.5;
    }

    40% {
        transform: scale(1);
        opacity: 1;
    }
}

.chat-input-container {
    padding: var(--spacing-lg) var(--spacing-xl);
}

.image-preview-container {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

.image-preview-container:empty {
    display: none;
}

.image-preview {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: 12px;
    overflow: hidden;
    border: 2px solid var(--color-border);
    transition: all var(--transition-base);
}

.image-preview:hover {
    border-color: var(--color-primary);
    transform: scale(1.05);
}

.image-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-preview-remove {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-error);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.image-preview:hover .image-preview-remove {
    opacity: 1;
}

.chat-input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 24px;
    padding: var(--spacing-sm) var(--spacing-md);
    transition: all var(--transition-base);
}

.chat-input-wrapper:focus-within {
    border-color: var(--color-primary);
    background: var(--color-bg);
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.05);
}

.icon-btn-small {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    flex-shrink: 0;
    transition: all var(--transition-base);
}

.icon-btn-small:hover {
    background: var(--color-surface-hover);
    color: var(--color-primary);
    transform: scale(1.05);
}

#chatInput {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    outline: none;
    padding: var(--spacing-sm);
    max-height: 120px;
    min-height: 24px;
    color: var(--color-text-primary);
}

#chatInput::placeholder {
    color: var(--color-text-tertiary);
}

.send-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-base);
}

.send-btn:hover {
    background: var(--color-primary-hover);
    transform: scale(1.05);
}

.send-btn:active {
    transform: scale(0.95);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* ===========================
   Preview Panel (Right Side)
   =========================== */
.preview-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
}

.preview-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--color-bg);
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.preview-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.device-selector {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--color-surface);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
}

.device-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.device-btn:hover {
    background: var(--color-surface-hover);
    color: var(--color-text-primary);
    transform: scale(1.05);
}

.device-btn.active {
    background: var(--color-bg);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.preview-actions {
    margin-left: auto;
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.version-navigation {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-surface);
    border-radius: var(--radius-md);
}

.version-nav-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    background: transparent;
    transition: all var(--transition-base);
}

.version-nav-btn:hover:not(:disabled) {
    background: var(--color-bg);
    color: var(--color-primary);
    transform: scale(1.1);
}

.version-nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.version-indicator {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-primary);
    min-width: 100px;
    text-align: center;
}

.action-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    color: var(--color-text-primary);
    font-weight: 500;
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
}

.action-btn:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    transform: translateY(-1px);
}

.preview-container {
    flex: 1;
    padding: var(--spacing-2xl);
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-frame {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-slow);
    overflow: auto;
    min-height: 400px;
}

.preview-frame.desktop {
    width: 100%;
    max-width: 1200px;
    height: 100%;
}

.preview-frame.tablet {
    width: 768px;
    max-width: 90%;
    height: 100%;
    max-height: 90vh;
}

.preview-frame.mobile {
    width: 375px;
    max-width: 90%;
    height: 100%;
    max-height: 90vh;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--color-text-tertiary);
    padding: var(--spacing-2xl);
}

.empty-state svg {
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.empty-state p {
    font-size: var(--font-size-sm);
}

/* ===========================
   Modal
   =========================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn var(--transition-base);
}

.modal.active {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--color-bg);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-xl);
    animation: slideUp var(--transition-base);
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.close-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.close-btn:hover {
    background: var(--color-surface);
    color: var(--color-text-primary);
    transform: scale(1.05);
}

.modal-body {
    padding: var(--spacing-xl);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

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

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

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    color: var(--color-text-primary);
    transition: all var(--transition-base);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-group small {
    display: block;
    margin-top: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
}

.modal-footer {
    padding: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

.btn-primary,
.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 20px;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
}

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

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-surface-hover);
    transform: translateY(-1px);
}

/* ===========================
   Versions Sidebar
   =========================== */
.versions-sidebar {
    position: absolute;
    top: 0;
    right: 0;
    width: 320px;
    height: 100%;
    background: var(--color-bg);
    border-left: 1px solid var(--color-border);
    z-index: 10;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-lg);
}

.versions-sidebar.active {
    transform: translateX(0);
}

.versions-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.versions-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

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

.versions-list::-webkit-scrollbar {
    width: 6px;
}

.versions-list::-webkit-scrollbar-track {
    background: transparent;
}

.versions-list::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.empty-versions {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-tertiary);
}

.version-item {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.version-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.version-item.active {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.version-thumbnail {
    width: 100%;
    height: 216px;
    background: white;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    position: relative;
}

.version-thumbnail iframe {
    width: 640px;
    height: 480px;
    transform: scale(0.45);
    transform-origin: top left;
    pointer-events: none;
    border: none;
}

.version-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
}

.version-label {
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

.version-badge {
    background: var(--color-primary);
    color: white;
    font-size: var(--font-size-xs);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.version-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.version-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.version-action-btn {
    flex: 1;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.version-action-btn:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.version-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    background: var(--color-primary);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: 10px;
    padding: 0 6px;
    margin-left: var(--spacing-xs);
}

.preview-panel {
    position: relative;
}


/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .chat-panel {
        width: 100%;
        height: 50vh;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
    }

    .preview-panel {
        height: 50vh;
    }

    .preview-container {
        padding: var(--spacing-md);
    }

    .preview-frame.tablet,
    .preview-frame.mobile {
        transform: scale(0.8);
    }
}

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

.error-message {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    padding: var(--spacing-md);
    background: #fee;
    border-radius: var(--radius-md);
    margin-top: var(--spacing-sm);
}

/* ===========================
   Google AdSense Components
   =========================== */

/* Sidebar Ad Container */
.ad-sidebar-container {
    padding: 0 var(--spacing-xl) var(--spacing-md);
    animation: fadeIn 0.5s ease-out;
    min-height: 100px;
}

.ad-google-wrapper {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 90px;
}

/* Preview Banner Ad Container */
.ad-banner-container {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) var(--spacing-xl);
    animation: slideDown 0.5s ease-out;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* AdSense responsive container */
.adsbygoogle {
    display: block;
    min-width: 100%;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .ad-sidebar-container {
        padding: 0 var(--spacing-md) var(--spacing-sm);
    }

    .ad-banner-container {
        padding: var(--spacing-xs) var(--spacing-md);
    }
}