:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --border: #cccccc;
  --text: #111111;
  --muted: #666666;
  --hover: #eeeeee;
  --good: #060;
  --bad: #a00;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121212;
    --border: #444444;
    --text: #e8e8e8;
    --muted: #999999;
    --hover: #262626;
    --good: #6fbf73;
    --bad: #e07a7a;
  }
}

:root[data-theme="dark"] {
  --bg: #121212;
  --border: #444444;
  --text: #e8e8e8;
  --muted: #999999;
  --hover: #262626;
  --good: #6fbf73;
  --bad: #e07a7a;
}

* { box-sizing: border-box; }

a { color: var(--text); }
a:visited { color: var(--text); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 16px;
  line-height: 1.5;
}

header {
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: baseline;
  gap: 20px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
}

.brand { font-weight: bold; }

.header-inner nav:not([hidden]) { display: flex; gap: 16px; flex: 1; }
.header-inner nav a { color: var(--text); }

#header-email { color: var(--muted); }

main {
  max-width: 760px;
  margin: 24px auto;
  padding: 0 20px;
}

.view[hidden] { display: none; }

.card {
  border: 1px solid var(--border);
  padding: 20px;
  margin-bottom: 20px;
}

h1 { margin-top: 0; font-size: 1.4em; }
h2 { margin-top: 0; font-size: 1.15em; }

.muted { color: var(--muted); font-size: 0.9em; }

form { display: flex; flex-direction: column; gap: 12px; font-family: Arial, Helvetica, sans-serif; font-size: 14px; }

label { display: flex; flex-direction: column; gap: 4px; }

input, select, textarea, button {
  font: inherit;
}

input[type="text"], input[type="email"], input[type="number"], select, textarea {
  border: 1px solid var(--border);
  padding: 6px 8px;
  width: 100%;
  background: var(--bg);
  color: var(--text);
}

button {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--text);
  padding: 6px 14px;
  cursor: pointer;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
}
button:hover { background: var(--hover); }
button:disabled { opacity: 0.5; cursor: default; }

.link-btn {
  background: none;
  border: none;
  text-decoration: underline;
  padding: 0;
}
.link-btn:hover { background: none; }

.preset { font-size: 13px; padding: 4px 10px; }

.exam-count-row { display: flex; gap: 8px; align-items: center; }
.exam-count-row input { width: 80px; }

.message {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
  padding: 8px 0;
  border-top: 1px solid var(--border);
  margin-top: 8px;
}
.message.error { color: var(--bad); }
.message.good { color: var(--good); }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  margin-top: 12px;
  font-family: Arial, Helvetica, sans-serif;
}
.stat-tile {
  background: var(--bg);
  padding: 10px;
  border: 1px solid var(--border);
  margin: -1px 0 0 -1px; /* collapse adjacent tile borders into hairlines */
}
.stat-tile .value { font-size: 1.4em; font-weight: bold; }
.stat-tile .label { color: var(--muted); font-size: 0.8em; }

.exam-progress {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.85em;
  margin-bottom: 10px;
}

#exam-options { display: flex; flex-direction: column; gap: 6px; margin: 16px 0; }
.option-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px;
  border: 1px solid var(--border);
  cursor: pointer;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
}
.option-row:hover { border-color: var(--text); }
.option-row.correct { border-left: 4px solid var(--good); }
.option-row.incorrect { border-left: 4px solid var(--bad); }
.option-row input { margin-top: 3px; }

.explanation {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  margin: 12px 0;
}

table { width: 100%; border-collapse: collapse; margin-top: 12px; font-family: Arial, Helvetica, sans-serif; font-size: 13px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: bold; }

.pending-item {
  border: 1px solid var(--border);
  padding: 14px;
  margin-bottom: 12px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
}
.pending-actions { display: flex; gap: 8px; margin-top: 10px; }
.badge {
  display: inline-block;
  border: 1px solid var(--border);
  padding: 1px 6px;
  font-size: 0.8em;
  color: var(--muted);
  margin-right: 6px;
}