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

body {
    font-family: 'Noto Sans JP', sans-serif;
    background: #fafafa;
    color: #333;
    line-height: 1.6;
}

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

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

header p {
    font-size: 1.1rem;
    color: #666;
    font-weight: 300;
}

.tab-nav {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid #e0e0e0;
}

.tab-button {
    background: none;
    border: none;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-family: inherit;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    color: #666;
}

.tab-button.active {
    color: #2c3e50;
    border-bottom-color: #3498db;
    font-weight: 500;
}

.tab-button:hover {
    background: rgba(52, 152, 219, 0.1);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: #3498db;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
    font-weight: 500;
}

.add-project-section {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.add-project-section h2 {
    margin-bottom: 1.5rem;
    color: #2c3e50;
}

#project-form {
    display: grid;
    gap: 1rem;
}

input, textarea, select {
    padding: 0.8rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: #3498db;
}

textarea {
    min-height: 100px;
    resize: vertical;
}

button[type="submit"] {
    background: #3498db;
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s ease;
}

button[type="submit"]:hover {
    background: #2980b9;
}

.projects-list {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.projects-list h2 {
    margin-bottom: 1.5rem;
    color: #2c3e50;
}

.project-item {
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.project-item:hover {
    border-color: #3498db;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.project-title {
    font-weight: 500;
    font-size: 1.1rem;
    color: #2c3e50;
}

.project-status {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.status-idea {
    background: #fff3cd;
    color: #856404;
}

.status-executed {
    background: #d1ecf1;
    color: #0c5460;
}

.status-success {
    background: #d4edda;
    color: #155724;
}

.project-description {
    color: #666;
    margin-bottom: 1rem;
}

.project-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-small {
    padding: 0.3rem 0.8rem;
    border: none;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-edit {
    background: #f8f9fa;
    color: #666;
    border: 1px solid #e0e0e0;
}

.btn-edit:hover {
    background: #e9ecef;
}

.btn-delete {
    background: #dc3545;
    color: white;
}

.btn-delete:hover {
    background: #c82333;
}

.chart-container {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    height: 400px;
}

.insights {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.insights h3 {
    margin-bottom: 1rem;
    color: #2c3e50;
}

.insight-item {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    border-left: 4px solid #3498db;
}

.simulation-section {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.simulation-section h2 {
    margin-bottom: 2rem;
    color: #2c3e50;
}

.simulation-controls {
    display: grid;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.simulation-controls label {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-weight: 500;
}

.simulation-controls input[type="range"] {
    flex: 1;
    margin: 0 1rem;
}

.simulation-controls span {
    min-width: 60px;
    text-align: right;
    font-weight: 700;
    color: #3498db;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.result-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    border: 2px solid #e0e0e0;
}

.result-number {
    font-size: 2rem;
    font-weight: 700;
    color: #27ae60;
    margin-bottom: 0.5rem;
}

.result-label {
    font-size: 0.9rem;
    color: #666;
    font-weight: 500;
}

.simulation-chart {
    height: 300px;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .tab-nav {
        flex-direction: column;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .project-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}