:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-color: #1f2937;
    --light-color: #f9fafb;
    --gray-color: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --radius: 8px;
}

* {
    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: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    min-height: calc(100vh - 40px);
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo-container h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 5px;
}

.tagline {
    font-size: 14px;
    opacity: 0.9;
}

.controls {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

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

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

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

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* Toolbar */
.toolbar {
    background: var(--light-color);
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.toolbar-group {
    display: flex;
    gap: 5px;
    padding-right: 15px;
    border-right: 1px solid var(--border-color);
}

.toolbar-group:last-child {
    border-right: none;
}

.toolbar-btn {
    padding: 8px 12px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.toolbar-select, .toolbar-color {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: white;
    cursor: pointer;
}

/* Editor Container */
.editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin: 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

.editor-tabs {
    display: flex;
    background: var(--light-color);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    padding: 12px 24px;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 600;
    color: var(--gray-color);
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: white;
}

.tab-btn:hover:not(.active) {
    color: var(--dark-color);
}

.tab-content {
    flex: 1;
    position: relative;
}

.tab-pane {
    display: none;
    height: 100%;
}

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

/* WYSIWYG Editor */
.wysiwyg-editor {
    min-height: 500px;
    padding: 25px;
    line-height: 1.6;
    font-size: 16px;
    outline: none;
    overflow-y: auto;
}

.wysiwyg-editor:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

.wysiwyg-editor h1, .wysiwyg-editor h2, .wysiwyg-editor h3 {
    margin: 20px 0 10px 0;
    color: var(--dark-color);
}

.wysiwyg-editor p {
    margin-bottom: 15px;
}

.wysiwyg-editor ul, .wysiwyg-editor ol {
    margin-left: 30px;
    margin-bottom: 15px;
}

.wysiwyg-editor blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 20px;
    margin: 20px 0;
    font-style: italic;
    color: var(--gray-color);
}

.wysiwyg-editor pre {
    background: var(--light-color);
    padding: 15px;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 15px 0;
}

.wysiwyg-editor table {
    border-collapse: collapse;
    width: 100%;
    margin: 15px 0;
}

.wysiwyg-editor table, .wysiwyg-editor th, .wysiwyg-editor td {
    border: 1px solid var(--border-color);
}

.wysiwyg-editor th, .wysiwyg-editor td {
    padding: 10px;
    text-align: left;
}

/* Preview Area */
.preview-area {
    min-height: 500px;
    padding: 25px;
    overflow-y: auto;
    background: var(--light-color);
}

/* Output Areas */
.output-area {
    width: 100%;
    height: 500px;
    padding: 20px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    border: none;
    resize: none;
    background: #1e1e1e;
    color: #d4d4d4;
    line-height: 1.5;
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 8px 16px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    z-index: 10;
}

/* Export Panel */
.export-panel {
    margin: 20px;
    padding: 25px;
    background: var(--light-color);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.export-panel h3 {
    margin-bottom: 20px;
    color: var(--dark-color);
}

.export-options {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 25px;
}

.export-btn {
    padding: 12px 24px;
    background: white;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

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

.export-advanced {
    background: white;
    padding: 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-group label {
    min-width: 150px;
    font-weight: 600;
}

.form-group input[type="text"] {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

/* Footer */
.footer {
    background: var(--dark-color);
    color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.stats {
    display: flex;
    gap: 20px;
    font-size: 14px;
}

.footer-info {
    text-align: right;
}

.btn-install {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    padding: 30px;
    border-radius: var(--radius);
    width: 90%;
    max-width: 500px;
    position: relative;
}

.close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 24px;
    cursor: pointer;
    color: var(--gray-color);
}

.modal-body {
    margin-top: 20px;
}

.modal-input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.file-upload {
    margin-bottom: 15px;
}

/* Responsive */
@media (max-width: 1024px) {
    .toolbar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .toolbar-group {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 10px;
        margin-bottom: 10px;
        width: 100%;
    }
    
    .editor-tabs {
        flex-wrap: wrap;
    }
    
    .export-options {
        flex-direction: column;
    }
    
    .footer {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .footer-info {
        text-align: center;
    }
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .controls {
        width: 100%;
        justify-content: center;
    }
    
    .wysiwyg-editor, .preview-area, .output-area {
        min-height: 400px;
    }
}