/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #374151;
    background-color: #ffffff;
    min-height: 100vh;
} */

.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
.header {
    text-align: center;
     background: linear-gradient(135deg, #9CA1E2 0%, #4b85e6 50%, #9CA1E2 100%);
    color: white !important;
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(30, 58, 138, 0.2);
}




header h1 {
    font-size: 45px !important;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.header p {
    font-size: 1.1rem;
    color: white !important;
}

/* Main content layout */
.main-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 30px;
    align-items: start;
}

/* Controls panel */
.controls-panel {
    background: #ffffff;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border:2px solid #1e40af;
}

.control-section {
    margin-bottom: 25px;
}

.control-section h3 {
    color: #1e40af;
    font-size: 1.3rem;
    margin-bottom: 15px;
    font-weight: 600;
    border-bottom: 2px solid #d97706;
    padding-bottom: 5px;
}

.control-section h4 {
    color: #1e40af;
    font-size: 1.1rem;
    margin-bottom: 10px;
    font-weight: 600;
}

/* Input styles */
.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #374151;
}

.input-group input,
.input-group textarea,
.input-group select {
    width: 100%;
    padding: 10px 12px !important;
    border:2px solid #1e40af!important;
    border-radius: 8px !important;
    font-size: 14px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background-color: #ffffff !important;
}

.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
    outline: none !important;
    border-color: #1e40af !important;
    box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.checkbox-group {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: 8px;
    transform: scale(1.2);
}

.checkbox-group label {
    color: #374151;
    font-weight: 600;
    cursor: pointer;
}

/* Color controls */
.color-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.color-input-group {
    display: flex;
    flex-direction: column;
}

.color-input-group label {
    margin-bottom: 5px;
    font-size: 0.9rem;
    font-weight: 600;
    color: #374151 !important;
}

.color-input-group input[type="color"] {
    width: 100%;
    height: 40px;
    border: 2px solid #d97706 !important;
    border-radius: 8px !important;
    cursor: pointer;
    padding: 0px !important;
}

/* Buttons */
.generate-btn {
    width: 100%;
    padding: 15px !important;
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%) !important;
    color: white !important;
    border: none !important;
    border-radius: 10px !important;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer !important;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-bottom: 20px;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(30, 64, 175, 0.3);
}

.generate-btn:active {
    transform: translateY(0);
}

.download-buttons {
    display: flex;
    gap: 10px;
}

.download-btn {
    padding: 10px 15px !important;
    background: linear-gradient(135deg, #d97706 0%, #f59e0b 100%);
    color: white !important;
    border: none !important;
    border-radius: 8px !important;
    font-weight: 600;
    cursor: pointer !important;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    font-size: 12px !important;
}

.download-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(217, 119, 6, 0.3);
}

.download-btn:disabled {
    background: #9ca3af;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Preview panel */
.preview-panel {
    background: linear-gradient(135deg, #dbeafe 0%, #e0f2fe 100%);
    border-radius: 12px !important;
    padding: 25px !important;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border: 2px solid #1e40af;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.preview-header h3 {
    color: #1e40af;
    font-size: 1.3rem;
    margin-bottom: 0;
    font-weight: 600;
}

.download-section {
    display: flex;
    align-items: center;
}

.chart-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    background: white;
    border-radius: 8px;
    border: 2px solid #d1d5db;
    padding: 20px;
}

#histogramCanvas {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

/* Responsive design */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .controls-panel {
        order: 2;
    }
    
    .preview-panel {
        order: 1;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0px !important;
    }
    
    .header h1 {
        font-size: 35px !important;
/*         margin-bottom: 5px; */
    }
    
    .header p {
        font-size: 1rem;
    }
    
    .header {
        margin-bottom: 20px;
        padding: 15px 0;
    }
    
    .color-controls {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .preview-header {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
        gap: 10px;
    }
    
    .controls-panel {
        padding: 15px;
    }
    
    .preview-panel {
        padding: 15px;
    }
    
    .chart-container {
        min-height: 250px;
        padding: 10px;
    }
    
    #histogramCanvas {
        width: 100%;
        max-width: 100%;
        height: auto;
    }
    
    .control-section {
        margin-bottom: 20px;
    }
    
    .input-group {
        margin-bottom: 12px;
    }
    
    .input-group input,
    .input-group textarea,
    .input-group select {
        padding: 8px 10px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 8px;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .header p {
        font-size: 0.9rem;
    }
    
    .header {
        margin-bottom: 15px;
        padding: 10px 0;
    }
    
    .control-section h3 {
        font-size: 1.1rem;
        margin-bottom: 12px;
    }
    
    .controls-panel {
        padding: 12px;
    }
    
    .preview-panel {
        padding: 12px;
    }
    
    .chart-container {
        min-height: 200px;
        padding: 8px;
    }
    
    .control-section {
        margin-bottom: 15px;
    }
    
    .input-group {
        margin-bottom: 10px;
    }
    
    .input-group input,
    .input-group textarea,
    .input-group select {
        padding: 6px 8px;
        font-size: 13px;
    }
    
    .generate-btn {
        padding: 10px;
        font-size: 0.95rem;
    }
    
    .download-btn {
        padding: 8px 12px;
        font-size: 11px;
    }
    
    .color-input-group input[type="color"] {
        height: 35px;
    }
    
    .preview-header h3 {
        font-size: 1.1rem;
        margin-bottom: 8px;
    }
    
    .download-buttons {
        gap: 8px;
        justify-content: center;
    }
}

@media (max-width: 360px) {
    .container {
        padding: 5px;
    }
    
    .header h1 {
        font-size: 1.3rem;
    }
    
    .controls-panel,
    .preview-panel {
        padding: 10px;
    }
    
    .chart-container {
        min-height: 180px;
        padding: 5px;
    }
    
    .input-group input,
    .input-group textarea,
    .input-group select {
        padding: 5px 6px;
        font-size: 12px;
    }
    
    .generate-btn {
        padding: 8px;
        font-size: 0.9rem;
    }
    
    .download-btn {
        padding: 6px 10px;
        font-size: 10px;
    }
}

/* Animation for smooth transitions */
.chart-container {
    transition: all 0.3s ease;
}

.input-group input,
.input-group textarea,
.input-group select {
    transition: all 0.2s ease;
}

/* Loading state */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* Success message */
.success-message {
    position: fixed;
    top: 20px;
    right: 20px;
    background: #10b981;
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    z-index: 1000;
    opacity: 0;
    transform: translateX(100px);
    transition: all 0.3s ease;
}

.success-message.show {
    opacity: 1;
    transform: translateX(0);
}