body {
    font-family: system-ui, sans-serif;
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.center {
    max-width: 480px;
    margin: 0 auto;
    text-align: center;
}

label {
    display: block;
    margin-top: 1rem;
    font-weight: bold;
}

input, button {
    font-size: 1.25rem;
    padding: 0.75rem;
    width: 100%;
    margin: 0.5rem 0;
    box-sizing: border-box;
}

.btn {
    border: none;
    color: white;
    font-weight: bold;
    border-radius: 0.5rem;
    padding: 1.5rem;
    font-size: 1.5rem;
}

.btn-in {
    background-color: #1a7f37;
}

.btn-out {
    background-color: #c0342c;
}

.flash {
    background: #fff3cd;
    border: 1px solid #ffe69c;
    padding: 0.75rem;
    border-radius: 0.5rem;
}

nav {
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #ccc;
    display: flex;
    align-items: center;
    gap: 1rem;
}

nav form.inline {
    margin-left: auto;
}

form.inline, form.inline button {
    width: auto;
    margin: 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

th, td {
    text-align: left;
    padding: 0.4rem 0.6rem;
    border-bottom: 1px solid #ddd;
}

tr.late {
    background: #fff3cd;
}

tr.not-in {
    color: #999;
}