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

body {
    font-family: Arial, sans-serif;
    background: #f5f7fa;
    color: #333;
    padding: 20px;
}

#app {
    max-width: 1400px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

header h1 {
    font-size: 28px;
    color: #1a73e8;
}

main {
    display: flex;
    gap: 20px;
}

#sidebar {
    width: 200px;
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

#activity-list {
    flex: 1;
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

#space-status {
    width: 300px;
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.activity-card {
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 12px;
    transition: all 0.2s;
}

.activity-card.conflict {
    border: 2px solid red;
    background: #fff0f0;
}

.activity-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.tag {
    display: inline-block;
    background: #e8f0fe;
    color: #1a73e8;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    margin-right: 4px;
}

.btn {
    background: #1a73e8;
    color: white;
    border: none;
    padding: 6px 14px;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 8px;
    margin-right: 6px;
}

.btn:hover {
    background: #1557b0;
}

.btn-danger {
    background: #d93025;
}

.btn-danger:hover {
    background: #b3261e;
}

.space-card {
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 10px;
    color: white;
    font-weight: bold;
}

.space-free {
    background: #34a853;
}

.space-occupied {
    background: #ea4335;
}

.space-maintenance {
    background: #9aa0a6;
}