:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #f5f6fa;
    --border-color: #dcdde1;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--primary-color);
    line-height: 1.6;
    overflow-x: auto;
}

.container {
    min-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    margin-bottom: 2rem;
    text-align: center;
}

h1 {
    margin-bottom: 1.5rem;
}

.file-upload {
    margin-bottom: 2rem;
}

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

.file-upload label {
    background-color: var(--secondary-color);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.file-upload label:hover {
    background-color: #2980b9;
}

.view-section {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-sizing: border-box;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    width: 100%;
}

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

th, td {
    padding: 0.8rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--background-color);
    font-weight: 600;
}

.timeline-container {
    height: auto;
}

.canvas-container {
    width: 100%;
    margin-top: 1rem;
    height: auto;
    overflow: hidden;
}

canvas {
    display: block;
}

.completed-task {
    background: linear-gradient(to right, rgba(46, 204, 113, 0.1), rgba(46, 204, 113, 0.2));
    position: relative;
}

.completed-task::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: #2ecc71;
}

.completed-task td {
    color: #27ae60;
}

.timeline-controls {
    margin-bottom: 1rem;
}

.checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-container input[type="checkbox"] {
    margin-right: 8px;
}

.checkbox-label {
    font-size: 14px;
    color: var(--primary-color);
}

.export-button-container {
    margin-top: 5px;
    text-align: right;
    padding-right: 20px;
}

.export-button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
}

.export-button:hover {
    background-color: #2980b9;
}