*,
*::before,
*::after {
  box-sizing: border-box;
}
body {
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  margin: 0;
  background: #0f1419;
  color: #e7e9ea;
  line-height: 1.5;
}
a {
  color: #1d9bf0;
}
.wrap {
  max-width: 560px;
  margin: 0 auto;
  padding: 1.5rem;
}
h1 {
  font-size: 1.35rem;
  margin: 0 0 0.5rem;
}
.muted {
  color: #71767b;
  font-size: 0.9rem;
}
nav {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}
.card {
  background: #16181c;
  border: 1px solid #2f3336;
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}
label {
  display: block;
  font-size: 0.85rem;
  color: #71767b;
  margin-bottom: 0.25rem;
}
input[type='text'] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid #2f3336;
  border-radius: 8px;
  background: #000;
  color: #e7e9ea;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}
.q-row {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #2f3336;
}
.q-row:last-child {
  border-bottom: none;
}
.q-id {
  font-family: ui-monospace, monospace;
  font-size: 1.1rem;
  font-weight: 600;
}
.timer {
  font-size: 1.5rem;
  font-weight: 700;
  color: #f4212e;
  text-align: center;
  margin: 1rem 0;
}
.timer.ok {
  color: #00ba7c;
}
.btn {
  display: inline-block;
  width: 100%;
  padding: 0.75rem;
  border: none;
  border-radius: 999px;
  background: #1d9bf0;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.btn.secondary {
  background: #2f3336;
}
.result {
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
}
.result.pass {
  background: #003d29;
  color: #00ba7c;
}
.result.fail {
  background: #3d1a1a;
  color: #f4212e;
}
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
  font-size: 0.9rem;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
th,
td {
  border: 1px solid #2f3336;
  padding: 0.4rem 0.5rem;
  text-align: left;
}
th {
  background: #16181c;
}
pre {
  background: #000;
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.8rem;
}