/* Mobile-first, no external assets. Colors meet WCAG AA on their surfaces. */
:root {
  --surface: #fcfcfb;
  --surface-2: #f1f0ec;
  --text: #0b0b0b;
  --text-2: #52514e;
  --border: #d6d4cc;
  --accent: #1f5fae;
  --danger: #a3261b;
  --series-1: #2a78d6;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --surface: #1a1a19;
    --surface-2: #262624;
    --text: #ffffff;
    --text-2: #c3c2b7;
    --border: #45443f;
    --accent: #8cbcf5;
    --danger: #f08b80;
    --series-1: #3987e5;
  }
}
*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0;
  font: 1rem/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--surface);
  color: var(--text);
}
a { color: var(--accent); }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 0.5rem; top: 0.5rem; background: var(--surface); padding: 0.5rem; z-index: 1; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.site-header {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 1rem;
  padding: 0.75rem 1rem; border-bottom: 1px solid var(--border); background: var(--surface-2);
}
.brand { font-weight: 700; text-decoration: none; color: var(--text); }
.site-header nav ul { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; list-style: none; margin: 0; padding: 0; }
.site-header nav a { display: inline-block; padding: 0.5rem 0; }
.logout, .language-switch { margin-left: auto; }
.language-switch + .logout, .logout + .language-switch { margin-left: 0; }
.language-switch [role="group"] { display: flex; gap: 0.25rem; }
.language-switch button {
  background: none; color: var(--accent); padding: 0.5rem; min-height: 2.75rem; text-decoration: underline;
}
.language-switch button[aria-current="true"] { color: var(--text); text-decoration: none; font-weight: 700; }

main { max-width: 60rem; margin: 0 auto; padding: 1rem; }
h1 { font-size: 1.5rem; margin: 0.5rem 0 1rem; }
h2 { font-size: 1.2rem; margin: 1.5rem 0 0.75rem; }
h3 { font-size: 1rem; margin: 0 0 0.5rem; }
small, .muted { color: var(--text-2); }

.messages { list-style: none; padding: 0.75rem 1rem; background: var(--surface-2); border-left: 4px solid var(--accent); }
.errors, .error { color: var(--danger); }

.field { margin-bottom: 1rem; }
.field label { display: block; font-weight: 600; margin-bottom: 0.25rem; }
input, select, textarea, button, .button {
  font: inherit; min-height: 2.75rem; border-radius: 6px;
}
input, select, textarea {
  width: 100%; padding: 0.5rem; border: 1px solid var(--border); background: var(--surface); color: var(--text);
}
.has-error input, .has-error select, .has-error textarea { border-color: var(--danger); }
button, .button {
  display: inline-flex; align-items: center; justify-content: center; padding: 0.5rem 1.25rem;
  border: 0; background: var(--accent); color: var(--surface); text-decoration: none; cursor: pointer;
}
button.danger, .button.danger { background: var(--danger); }
.link-button { background: none; color: var(--accent); padding: 0.5rem 0; min-height: 0; text-decoration: underline; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; margin-top: 1rem; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
caption { text-align: left; font-weight: 600; padding: 0.5rem 0; }
th, td { text-align: left; padding: 0.5rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.num { text-align: right; font-variant-numeric: tabular-nums; }

.summaries { display: grid; gap: 1rem; }
.summary { background: var(--surface-2); border-radius: 8px; padding: 1rem; }
.summary dl, .details { margin: 0; display: grid; gap: 0.25rem 1rem; }
.summary dl div, .details div { display: flex; justify-content: space-between; gap: 1rem; border-bottom: 1px solid var(--border); padding: 0.25rem 0; }
.summary dd, .details dd { margin: 0; font-variant-numeric: tabular-nums; text-align: right; }
.details dt { color: var(--text-2); }

.chart { margin: 0; }
.chart svg { width: 100%; height: 10rem; display: block; }
.chart .mark { fill: var(--series-1); }
.chart .hit { fill: transparent; }
.chart .bar:hover .mark { opacity: 0.8; }
.chart .baseline { stroke: var(--border); stroke-width: 1; vector-effect: non-scaling-stroke; }
.chart .axis { fill: var(--text-2); font-size: 9px; }
.chart details { margin-top: 0.5rem; }

.pagination { display: flex; gap: 1rem; margin-top: 1rem; }

@media (min-width: 40rem) {
  .summaries { grid-template-columns: 1fr 1fr; }
  .details { grid-template-columns: 1fr 1fr; }
  .session-form { display: grid; grid-template-columns: 1fr 1fr; gap: 0 1rem; }
  .session-form .actions, .session-form .errors { grid-column: 1 / -1; }
}