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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #e8e8e8;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 30px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 3px solid #3498db;
}

header h1 {
    color: #3498db;
    font-size: 2.5em;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 1.1em;
}

.toolbar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    padding: 15px;
    background: #f5f5f5;
    border-radius: 8px;
    align-items: center;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(52, 152, 219, 0.3);
}

.btn-secondary {
    background: #e74c3c;
    color: white;
}

.btn-secondary:hover {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(231, 76, 60, 0.3);
}

.btn-save {
    background: #9b59b6;
    color: white;
}

.btn-save:hover {
    background: #8e44ad;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(155, 89, 182, 0.3);
}

.btn-load {
    background: #f39c12;
    color: white;
}

.btn-load:hover {
    background: #e67e22;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(243, 156, 18, 0.3);
}

.btn-upload {
    background: #27ae60;
    color: white;
}

.btn-upload:hover {
    background: #229954;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(39, 174, 96, 0.3);
}

/* Hover zones for adding cells */
.cell-hover-zone {
    height: 30px;
    margin: 0;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.cell-hover-zone:hover {
    opacity: 1;
}

.cell-hover-zone-end {
    height: 50px;
    margin-top: 10px;
}

.add-cell-button {
    padding: 6px 16px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.add-cell-button:hover {
    background: #2980b9;
    transform: scale(1.05);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
}

.add-cell-button:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

.file-name {
    color: #27ae60;
    font-weight: bold;
    margin-left: 10px;
}

.notebook {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.cell {
    border: 2px solid #ddd;
    border-radius: 8px;
    padding: 15px;
    background: #ffffff;
    transition: all 0.3s ease;
}

.cell:hover {
    border-color: #667eea;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.1);
}

.cell-header {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
}

.cell-type-selector {
    padding: 8px 12px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 0.9em;
    background: white;
    cursor: pointer;
}

.cell-type-selector:focus {
    outline: none;
    border-color: #667eea;
}

.btn-run {
    padding: 8px 15px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.3s ease;
}

.btn-run:hover {
    background: #2980b9;
    transform: scale(1.05);
}

.btn-run:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

.btn-stop {
    padding: 8px 15px;
    background: #e74c3c;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.3s ease;
}

.btn-stop:hover {
    background: #c0392b;
    transform: scale(1.05);
}

.btn-stop:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

.btn-toggle {
    padding: 8px 12px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.3s ease;
}

.btn-toggle:hover {
    background: #2980b9;
    transform: scale(1.05);
}

.btn-toggle:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

.btn-delete {
    padding: 8px 12px;
    background: #e74c3c;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    margin-left: auto;
    transition: all 0.3s ease;
}

.btn-delete:hover {
    background: #c0392b;
    transform: scale(1.05);
}

.btn-delete:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

.cell-input {
    width: 100%;
    min-height: 120px;
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.95em;
    resize: vertical;
    background: #f5f5f5;
    color: #333;
    transition: all 0.3s ease;
}

.cell-input.collapsed {
    min-height: 0;
    max-height: 0;
    padding: 0;
    border: none;
    overflow: hidden;
    opacity: 0;
}

.cell-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: #fafafa;
}

.cell-input.view-mode {
    background: #f9f9f9;
    border-color: #ccc;
    cursor: default;
}

.cell-input.view-mode:focus {
    border-color: #999;
    box-shadow: 0 0 0 2px rgba(153, 153, 153, 0.2);
    background: #f9f9f9;
}

.cell-output {
    margin-top: 10px;
    padding: 15px;
    background: white;
    border-radius: 5px;
    min-height: 40px;
}

.text-output {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    background: #f8f9fa;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    border-left: 4px solid #667eea;
}

.plot-output {
    max-width: 100%;
    height: auto;
    border-radius: 5px;
    margin: 10px 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.error {
    color: #e74c3c;
    background: #fadbd8;
    padding: 15px;
    border-radius: 5px;
    border-left: 4px solid #e74c3c;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

.info {
    color: #3498db;
    background: #d6eaf8;
    padding: 15px;
    border-radius: 5px;
    border-left: 4px solid #3498db;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* Blockquote styling for markdown */
.markdown-output blockquote {
    background: #f4f4f4;
    border-left: 4px solid #ccc;
    margin: 10px 0;
    padding: 10px 15px;
    font-style: italic;
    color: #555;
}

/* List styling for markdown */
.markdown-output ul,
.markdown-output ol {
    margin: 10px 0;
    padding-left: 25px;
}

.markdown-output li {
    margin: 5px 0;
}

/* Table styling for markdown */
.markdown-output table {
    border-collapse: collapse;
    width: 100%;
    margin: 15px 0;
    border: 1px solid #ddd;
}

.markdown-output th,
.markdown-output td {
    border: 1px solid #ddd;
    padding: 8px 12px;
    text-align: left;
}

.markdown-output th {
    background-color: #f2f2f2;
    font-weight: bold;
}

.markdown-output tr:nth-child(even) {
    background-color: #f9f9f9;
}

.loading {
    color: #667eea;
    font-style: italic;
    padding: 10px;
}

.no-output {
    color: #999;
    font-style: italic;
    padding: 10px;
}

.markdown-output {
    padding: 15px;
    line-height: 1.6;
}

.markdown-output h1 {
    color: #333;
    margin: 20px 0 10px 0;
    font-size: 2em;
}

.markdown-output h2 {
    color: #444;
    margin: 15px 0 8px 0;
    font-size: 1.6em;
}

.markdown-output h3 {
    color: #555;
    margin: 12px 0 6px 0;
    font-size: 1.3em;
}

.markdown-output code {
    background: #f4f4f4;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

.markdown-output pre {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    border-left: 4px solid #667eea;
}

.markdown-output ul {
    margin-left: 20px;
    list-style-type: disc;
}

.markdown-output li {
    margin: 5px 0;
}

.markdown-output strong {
    font-weight: bold;
    color: #333;
}

.markdown-output em {
    font-style: italic;
    color: #555;
}

/* Hide PyScript traceback pane completely */
/* Hide PyScript error terminals completely */
py-terminal,
py-repl,
.py-terminal,
.py-repl,
[data-pyscript-terminal],
#pyscript-terminal,
py-script-error,
.py-error {
    display: none !important;
    visibility: hidden !important;
    height: 0 !important;
    max-height: 0 !important;
    overflow: hidden !important;
    opacity: 0 !important;
    position: absolute !important;
    bottom: -9999px !important;
}

/* Markdown spacing adjustments */
.markdown-output p {
    margin: 0.5em 0;
}

.markdown-output h1,
.markdown-output h2,
.markdown-output h3,
.markdown-output h4,
.markdown-output h5,
.markdown-output h6 {
    margin: 0.8em 0 0.4em 0;
}

.markdown-output ul,
.markdown-output ol {
    margin: 0.5em 0;
    padding-left: 1.5em;
}

.markdown-output li {
    margin: 0.2em 0;
}

.markdown-output blockquote {
    margin: 0.5em 0;
}

.markdown-output table {
    margin: 0.8em 0;
}

.markdown-output pre {
    margin: 0.5em 0;
}

.markdown-output code {
    margin: 0;
}

/* Reduce line height for tighter text */
.markdown-output {
    line-height: 1.4;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    .toolbar {
        flex-wrap: wrap;
    }
    
    .btn {
        padding: 8px 15px;
        font-size: 0.9em;
    }
}