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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --border: #30363d;
    --accent: #238636;
    --accent-hover: #2ea043;
    --danger: #da3633;
    --warning: #fb8500;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 30px;
    padding: 40px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.title {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.subtitle {
    font-size: 16px;
    color: var(--text-secondary);
}

.seo-text {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 12px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.4;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.language-selector select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
}

.action-buttons {
    display: flex;
    gap: 12px;
}

.btn {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

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

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

.editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    height: 600px;
}

.editor-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border);
}

.panel-header h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.stats {
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    gap: 16px;
}

#inputCode, #outputCode {
    flex: 1;
    width: 100%;
    background: var(--bg-primary);
    border: none;
    color: var(--text-primary);
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.45;
    padding: 16px;
    resize: none;
    outline: none;
    overflow: auto;
}

#inputCode::placeholder {
    color: var(--text-secondary);
}

.file-upload input[type="file"] {
    display: none;
}

.file-upload label {
    padding: 6px 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    color: var(--text-secondary);
}

.file-upload label:hover {
    background: var(--bg-tertiary);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.feature {
    padding: 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.feature h4 {
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.feature p {
    font-size: 14px;
    color: var(--text-secondary);
}

.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 40px;
    padding: 20px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
    position: relative;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links {
    display: flex;
    gap: 16px;
}

.footer-link {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 12px;
    cursor: pointer;
    text-decoration: underline;
    padding: 0;
}

.footer-link:hover {
    color: var(--accent);
}

.github-links {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 13px;
    background: var(--bg-secondary);
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.github-links a {
    color: var(--text-primary);
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 6px;
    transition: all 0.15s ease;
    font-weight: 500;
}

.github-links a:hover {
    color: var(--accent);
    background: var(--bg-tertiary);
}

.footer::after {
    content: 'Made with ❤️ by viktorexe';
    font-size: 12px;
    color: var(--text-secondary);
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(4px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    width: 60%;
    max-width: 800px;
    max-height: 80vh;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.modal-close:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.modal-content {
    padding: 20px;
    max-height: 60vh;
    overflow-y: auto;
    color: var(--text-primary);
    line-height: 1.6;
}

.modal-content h4 {
    margin-top: 20px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.modal-content p {
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(13, 17, 23, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 1000;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border);
    border-top: 2px solid var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

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

@media (max-width: 768px) {
    .container {
        padding: 16px;
    }
    
    .controls {
        flex-direction: column;
        gap: 16px;
    }
    
    .editor-container {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    #inputCode, #outputCode {
        height: 300px;
    }
}