:root {
  font-family: Arial, sans-serif;
  color: #17191c;
  background: #ebe9e2;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
header {
  height: 54px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #aaa;
  letter-spacing: 0.08em;
}
header span,
.label,
#status {
  font: 10px monospace;
  color: #686a67;
}
main {
  padding: 24px 16px;
}
h1 {
  font-size: 38px;
  line-height: 0.95;
  letter-spacing: -0.05em;
  margin: 8px 0 18px;
}
p {
  font-size: 13px;
  line-height: 1.45;
}
button {
  width: 100%;
  min-height: 44px;
  border: 1px solid #17191c;
  background: transparent;
  font-weight: bold;
  margin-top: 14px;
}
#start {
  background: #17191c;
  color: white;
}
#mark:not(:disabled) {
  border-color: #d64a30;
  color: #d64a30;
}
#export:not(:disabled) {
  background: #225fd1;
  border-color: #225fd1;
  color: white;
}
#start i {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #d64a30;
  margin-right: 8px;
}
#status {
  padding: 14px 0;
  border-bottom: 1px solid #aaa;
}
ol {
  list-style: decimal-leading-zero;
  padding-left: 32px;
  max-height: 45vh;
  overflow: auto;
}
li {
  padding: 8px 0;
  border-bottom: 1px solid #ccc;
  font: 11px/1.4 monospace;
}
button:focus-visible {
  outline: 3px solid #225fd1;
  outline-offset: 3px;
}