:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background: #f5f6fa;
    --card-bg: #ffffff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: var(--background);
    color: var(--primary-color);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

.card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.flex-row {
    display: flex;
    gap: 10px;
    align-items: center;
    margin: 10px 0;
}

button {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: opacity 0.3s;
}

button:hover {
    opacity: 0.9;
}

input, select {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 5px;
    flex: 1;
}

.time-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 10px;
    margin-top: 15px;
}

.timestamp-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: #f8f9fa;
    border-radius: 5px;
}