:root {
    /* UI Light Mode Variables */
    --ui-bg: #f3f4f6;
    --ui-surface: #ffffff;
    --ui-border: #e5e7eb;
    --ui-text-main: #111827;
    --ui-text-muted: #6b7280;
    --ui-primary: #2563eb;
    --ui-primary-hover: #1d4ed8;
    --ui-accent: #3b82f6;
    --ui-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --ui-radius: 12px;
}

[data-theme="dark"] {
    --ui-bg: #0f1115;
    --ui-surface: #1a1d24;
    --ui-border: #2d313a;
    --ui-text-main: #f9fafb;
    --ui-text-muted: #9ca3af;
    --ui-primary: #3b82f6;
    --ui-primary-hover: #60a5fa;
    --ui-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--ui-bg);
    color: var(--ui-text-main);
    overflow: hidden;
    height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

/* App Layout */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

.sidebar {
    width: 320px;
    background-color: var(--ui-surface);
    border-right: 1px solid var(--ui-border);
    display: flex;
    flex-direction: column;
    height: 100%;
    z-index: 10;
    transition: all 0.3s ease;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--ui-border);
}

.sidebar-header h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
    background: linear-gradient(135deg, var(--ui-primary), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar-header p {
    font-size: 0.85rem;
    color: var(--ui-text-muted);
}

.control-group {
    padding: 20px 24px;
    border-bottom: 1px solid var(--ui-border);
    overflow-y: auto;
}

.sidebar > .control-group:nth-child(2) {
    overflow-y: visible; /* Select elements */
}

/* Scrollbar for sidebar */
.sidebar::-webkit-scrollbar {
    width: 6px;
}
.sidebar::-webkit-scrollbar-track {
    background: transparent;
}
.sidebar::-webkit-scrollbar-thumb {
    background: var(--ui-border);
    border-radius: 4px;
}

.control-header {
    margin-bottom: 16px;
}

.control-header h3 {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--ui-text-muted);
}

.input-row {
    margin-bottom: 16px;
}

.input-row label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--ui-text-main);
}

.input-row input[type="text"],
.input-row select {
    width: 100%;
    padding: 10px 12px;
    border-radius: 6px;
    border: 1px solid var(--ui-border);
    background-color: var(--ui-bg);
    color: var(--ui-text-main);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.input-row input[type="text"]:focus,
.input-row select:focus {
    outline: none;
    border-color: var(--ui-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* File Upload */
.file-upload {
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    border: 1px dashed var(--ui-border);
    background-color: var(--ui-bg);
    border-radius: 6px;
    padding: 10px 12px;
    cursor: pointer;
    transition: border-color 0.2s;
}

.file-upload:hover {
    border-color: var(--ui-primary);
}

.file-upload input[type="file"] {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
}

.file-label {
    font-size: 0.85rem;
    color: var(--ui-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    pointer-events: none;
}

/* Colors Grid */
.color-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.color-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.color-item label {
    font-size: 0.8rem;
    font-weight: 500;
}

.color-input-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--ui-bg);
    border: 1px solid var(--ui-border);
    border-radius: 6px;
    padding: 4px;
    transition: border-color 0.2s;
}
.color-input-wrap:focus-within {
    border-color: var(--ui-primary);
}

.color-input-wrap input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 4px;
    cursor: pointer;
    padding: 0;
    background: transparent;
}
.color-input-wrap input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}
.color-input-wrap input[type="color"]::-webkit-color-swatch {
    border: 1px solid rgba(128,128,128,0.2);
    border-radius: 4px;
}

.hex-input {
    background: transparent;
    border: none;
    color: var(--ui-text-main);
    font-family: inherit;
    font-size: 0.8rem;
    width: 100%;
    outline: none;
    text-transform: uppercase;
}

/* Toggles */
.toggle-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.toggle-row span {
    font-size: 0.85rem;
    font-weight: 500;
}

.toggle {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--ui-border);
    transition: .3s;
    border-radius: 22px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border: none;
    border-radius: 6px;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.btn-secondary {
    background-color: var(--ui-border);
    color: var(--ui-text-main);
}

.btn-secondary:hover {
    background-color: var(--ui-border);
    filter: brightness(0.9);
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.btn-full {
    width: 100%;
    padding: 12px;
    font-size: 0.95rem;
}

.btn-icon {
    padding: 8px;
    border-radius: 8px;
    background: transparent;
    color: var(--ui-text-muted);
}
.btn-icon:hover {
    background: var(--ui-border);
    color: var(--ui-text-main);
}

.action-buttons-inline {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.sidebar-footer {
    padding: 24px;
    border-top: 1px solid var(--ui-border);
    background-color: var(--ui-surface);
    margin-top: auto;
}

/* Main Content Area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    background-color: var(--ui-surface);
    border-bottom: 1px solid var(--ui-border);
    z-index: 5;
}

.header-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--ui-text-muted);
}

.indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #ef4444;
}

.indicator.active {
    background-color: #10b981;
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.4);
}

.preview-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 40px;
    background-image: 
        linear-gradient(rgba(128, 128, 128, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(128, 128, 128, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Ad Grid Layout */
.ad-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    align-items: flex-start;
    max-width: 1400px;
    margin: 0 auto;
}

.ad-wrapper {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ad-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ad-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ui-text-muted);
    font-family: 'Outfit', sans-serif;
    letter-spacing: 0.02em;
}

.ad-actions {
    display: flex;
    gap: 6px;
    opacity: 0;
    transition: opacity 0.2s;
}

.ad-wrapper:hover .ad-actions {
    opacity: 1;
}

.action-btn {
    background: var(--ui-surface);
    border: 1px solid var(--ui-border);
    color: var(--ui-text-muted);
    border-radius: 4px;
    padding: 4px 8px;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}
.action-btn:hover {
    background: var(--ui-primary);
    color: white;
    border-color: var(--ui-primary);
}

.ad-canvas-container {
    background: transparent;
    border-radius: 0;
    box-shadow: var(--ui-shadow);
    transition: transform 0.2s;
}
.ad-wrapper:hover .ad-canvas-container {
    transform: translateY(-2px);
}

/* Modal */
.export-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.export-modal.open {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: var(--ui-surface);
    width: 800px;
    max-width: 90%;
    max-height: 90vh;
    border-radius: var(--ui-radius);
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--ui-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.25rem;
}

.close-modal {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--ui-text-muted);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.code-block-wrapper {
    position: relative;
}

.code-block-wrapper h3 {
    font-size: 0.9rem;
    color: var(--ui-text-muted);
    margin-bottom: 8px;
}

.code-block-wrapper pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    font-family: monospace;
    font-size: 0.85rem;
    line-height: 1.4;
}

.copy-btn {
    position: absolute;
    top: 32px;
    right: 12px;
}

/* Animations */
@keyframes copyFeedback {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}
.copied-anim {
    animation: copyFeedback 0.3s ease;
    background-color: #10b981 !important;
    color: white !important;
    border-color: #10b981 !important;
}