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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1800px;
    margin: 0 auto;
}

header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2em;
    opacity: 0.9;
}

.main-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 20px;
}

/* Controls Panel */
.controls-panel {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    max-height: 90vh;
    overflow-y: auto;
}

.control-section {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 2px solid #f0f0f0;
}

.control-section:last-child {
    border-bottom: none;
}

.control-section h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.1em;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    padding: 5px 0;
}

.section-header:hover {
    opacity: 0.8;
}

.section-header h3 {
    margin-bottom: 0;
    flex-grow: 1;
}

.section-toggle {
    font-size: 0.8em;
    color: #667eea;
    transition: transform 0.3s ease;
    margin-left: 10px;
}

.section-toggle.collapsed {
    transform: rotate(-90deg);
}

.section-content {
    max-height: 2000px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.section-content.collapsed {
    max-height: 0;
}

#textInput {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    font-family: 'Arial', sans-serif;
    resize: vertical;
    direction: rtl;
}

#textInput:focus {
    outline: none;
    border-color: #667eea;
}

.control-group {
    margin-bottom: 15px;
}

.control-group label {
    display: block;
    margin-bottom: 5px;
    color: #333;
    font-weight: 500;
}

.control-group input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #e0e0e0;
    outline: none;
    -webkit-appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
}

.control-group input[type="color"] {
    width: 60px;
    height: 40px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
}

.color-value {
    margin-left: 10px;
    color: #666;
    font-family: monospace;
}

.download-btn, .reset-btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.download-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-bottom: 10px;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.reset-btn {
    background: #f0f0f0;
    color: #333;
}

.reset-btn:hover {
    background: #e0e0e0;
}

/* Preview Panel */
.preview-panel {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.preview-panel h3 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.1em;
}

.preview-container {
    background: repeating-conic-gradient(#f0f0f0 0% 25%, white 0% 50%) 50% / 20px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.loading {
    color: #667eea;
    font-size: 1.2em;
    font-weight: 600;
}

#previewImage {
    max-width: 100%;
    height: auto;
    display: block;
}

.preview-info {
    margin-top: 15px;
    text-align: center;
    color: #666;
    font-size: 14px;
}

/* Scrollbar Styling */
.controls-panel::-webkit-scrollbar {
    width: 8px;
}

.controls-panel::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.controls-panel::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 10px;
}

.controls-panel::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}

/* Responsive */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        max-height: none;
    }
}

/* Brush Mode Tabs */
.brush-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    border-bottom: 2px solid #e0e0e0;
}

.tab-button {
    flex: 1;
    padding: 10px 15px;
    background: #f5f5f5;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 500;
    color: #666;
    transition: all 0.3s ease;
}

.tab-button:hover {
    background: #e8e8e8;
    color: #333;
}

.tab-button.active {
    background: white;
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Toast notifications */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: #333;
    color: #fff;
    padding: 15px 20px;
    border-radius: 4px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    z-index: 10000;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s, transform 0.3s;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    background: #28a745;
}

.toast.error {
    background: #dc3545;
}

.toast.info {
    background: #17a2b8;
}