* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
    color: #333;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

header {
    background: linear-gradient(90deg, #2c3e50, #4a6491);
    color: white;
    padding: 25px;
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

.content {
    display: flex;
    flex-wrap: wrap;
    padding: 20px;
}

.preview-section {
    flex: 1;
    min-width: 300px;
    padding: 20px;
    border-right: 1px solid #eee;
}

.editor-section {
    flex: 1;
    min-width: 300px;
    padding: 20px;
}

h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #3498db;
}

.svg-container {
    width: 100%;
    height: 400px;
    border: 2px dashed #3498db;
    border-radius: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f8f9fa;
    overflow: hidden;
    position: relative;
}

.svg-preview {
    max-width: 100%;
    max-height: 100%;
}

.file-input-container {
    margin-bottom: 20px;
    text-align: center;
}

.file-input-label {
    display: inline-block;
    padding: 12px 25px;
    background: linear-gradient(90deg, #3498db, #2980b9);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

.file-input-label:hover {
    background: linear-gradient(90deg, #2980b9, #1f618d);
    transform: translateY(-2px);
}

.file-input {
    display: none;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
}

input[type="text"] {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input[type="text"]:focus {
    border-color: #3498db;
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.color-input-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.color-preview {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 2px solid #ddd;
    background-color: #8b4513;
}

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

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

.quick-color-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
}

.quick-btn {
    padding: 12px;
    border: 2px solid #3498db;
    background-color: #ecf0f1;
    color: #2c3e50;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.quick-btn:hover {
    background-color: #3498db;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
}

button {
    /* flex: 1; */
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.update-btn {
    background: linear-gradient(90deg, #27ae60, #2ecc71);
    color: white;
}

.update-btn:hover {
    background: linear-gradient(90deg, #219653, #27ae60);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(39, 174, 96, 0.4);
}

.reset-btn {
    background: linear-gradient(90deg, #e74c3c, #e67e22);
    color: white;
}

.reset-btn:hover {
    background: linear-gradient(90deg, #c0392b, #d35400);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
}

.instructions {
    background-color: #e8f4fc;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 25px;
    border-left: 5px solid #3498db;
}

.instructions h3 {
    color: #2c3e50;
    margin-bottom: 10px;
}

.instructions ul {
    padding-left: 20px;
}

.instructions li {
    margin-bottom: 8px;
    line-height: 1.5;
}

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.spinner {
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

.current-file {
    text-align: center;
    margin-top: 10px;
    font-style: italic;
    color: #7f8c8d;
}

.editor-tabs {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 2px solid #eee;
}

.tab {
    padding: 12px 20px;
    cursor: pointer;
    font-weight: 600;
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
}

.tab.active {
    color: #3498db;
    border-bottom: 3px solid #3498db;
}

.tab-content {
    display: none;
}

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

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 768px) {
    .content {
        flex-direction: column;
    }
    
    .preview-section {
        border-right: none;
        border-bottom: 1px solid #eee;
    }
    
    .button-group {
        flex-direction: column;
    }
}