body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    background: #f5f7fb;
    color: #18202a;
}

.shell {
    max-width: 960px;
    margin: 0 auto;
    padding: 32px 20px;
}

.nav a {
    margin-right: 12px;
}

.panel {
    margin-top: 20px;
    padding: 16px;
    background: #fff;
    border: 1px solid #d9e2ec;
    border-radius: 12px;
}

form {
    display: grid;
    gap: 12px;
    max-width: 360px;
}

label {
    display: grid;
    gap: 6px;
}

input, button {
    padding: 10px 12px;
    font: inherit;
}

.notice {
    padding: 12px 14px;
    border-radius: 10px;
    margin: 12px 0 16px;
}

.notice.success {
    background: #e8f7ee;
    color: #135b2b;
    border: 1px solid #b8e4c8;
}

.notice.error {
    background: #fdecec;
    color: #8f1d1d;
    border: 1px solid #f3b8b8;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}

th, td {
    text-align: left;
    padding: 10px 12px;
    border-bottom: 1px solid #e2e8f0;
    vertical-align: top;
}

.inline-form {
    display: inline;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
}