/* Small additions to Pico's classless theme. */
:root {
  --ok: #2e7d32;
  --err: #c62828;
  --ok-bg: color-mix(in srgb, var(--ok) 12%, transparent);
  --err-bg: color-mix(in srgb, var(--err) 12%, transparent);
}

body > header,
body > main {
  max-width: 960px;
  margin-inline: auto;
}
a.brand {
  text-decoration: none;
}

form.inline {
  display: inline-block;
  margin: 0 0.5rem 0.5rem 0;
}
form.inline button {
  margin: 0;
}
button.link {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  color: var(--pico-primary);
  text-decoration: underline;
  width: auto;
}

.flash {
  padding: 0.75rem 1rem;
  border-radius: var(--pico-border-radius);
}
.flash-success {
  background: var(--ok-bg);
  border-left: 4px solid var(--ok);
}
.flash-error {
  background: var(--err-bg);
  border-left: 4px solid var(--err);
}
.flash ul {
  margin-bottom: 0;
}
small.error,
.req {
  color: var(--err);
}

.badge {
  display: inline-block;
  padding: 0 0.5rem;
  border-radius: 1rem;
  font-size: 0.8em;
  border: 1px solid currentColor;
}
.badge-open {
  color: var(--ok);
}
.badge-closed {
  color: var(--err);
}
.badge-draft,
.badge-todo {
  color: var(--pico-muted-color);
}
.badge-completed {
  color: var(--ok);
}
.badge-in_progress {
  color: var(--pico-primary);
}

.pre {
  white-space: pre-line;
}
.muted {
  opacity: 0.6;
}
.narrow {
  max-width: 28rem;
  margin-inline: auto;
}
.scroll {
  overflow-x: auto;
}
td.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 0 1rem;
  align-items: end;
}
.check {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: 1rem;
}
.check input {
  margin: 0;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  gap: 1rem;
}
.stats .big {
  font-size: 2rem;
  font-weight: bold;
  margin: 0;
}

fieldset.question {
  border: 1px solid var(--pico-muted-border-color);
  padding: 1rem;
  border-radius: var(--pico-border-radius);
  margin-bottom: 1rem;
}
fieldset.question legend {
  padding: 0 0.5rem;
  font-weight: bold;
}
.q-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}
.q-actions button {
  width: auto;
  margin: 0;
  padding: 0.25rem 0.75rem;
}
/* Exercise editor: show only the fields of the row's block type and answer type. */
.js .block[data-type='markdown'] :is(.b-for-given, .b-for-question):not(.b-for-markdown),
.js .block[data-type='given'] :is(.b-for-markdown, .b-for-question):not(.b-for-given),
.js .block[data-type='question'] :is(.b-for-markdown, .b-for-given):not(.b-for-question),
.js .block[data-answer='number'] .b-for-enum,
.js .block[data-answer='enum'] .b-for-number {
  display: none;
}

.checklist label {
  display: block;
}
/* Pico makes a label's <small> a block pulled up under an input; here it follows the name. */
.checklist label small {
  display: inline;
  margin: 0;
}
.status-bar {
  margin-bottom: 1.5rem;
}
.pager {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.qr-sheet {
  text-align: center;
}
.qr svg {
  width: min(320px, 80vw);
  height: auto;
}
.url code {
  word-break: break-all;
}

/* Exercise table: one row per given value or question; green when solved, red after a wrong try. */
.md > :last-child {
  margin-bottom: 1rem;
}
.ex-table td {
  vertical-align: middle;
}
.ex-table tr.given td {
  background: var(--pico-card-sectioning-background-color);
}
.ex-table tr.q-ok td {
  background: var(--ok-bg);
}
.ex-table tr.q-ko td {
  background: var(--err-bg);
}
.ex-table .mark {
  font-weight: bold;
}
.ex-table tr.q-ok .mark {
  color: var(--ok);
}
.ex-table tr.q-ko .mark {
  color: var(--err);
}
.ex-table form.answer,
.ex-table form.answer fieldset {
  margin: 0;
}
.ex-table form.answer input,
.ex-table form.answer select {
  min-width: 7rem;
  text-align: right;
}
.ex-table .unit {
  align-self: center;
  padding: 0 0.5rem;
}
.ex-table form.tip-form {
  display: inline;
  margin: 0;
}
.ex-table form.tip-form button {
  font-size: 0.85em;
}
.ex-table tr.tip td {
  border-left: 4px solid var(--pico-primary);
  font-size: 0.9em;
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.try {
  display: inline-block;
  margin: 0 0.5rem 0.25rem 0;
  padding: 0 0.4rem;
  border-radius: var(--pico-border-radius);
}
.try-ok,
.cell-ok {
  background: var(--ok-bg);
}
.try-ko,
.cell-ko {
  background: var(--err-bg);
}
/* Student exercise page: sticky progress, compact solved rows, hint button. */
.ex-title {
  margin-bottom: 0.5rem;
}
.progress-bar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  margin-bottom: 1rem;
  background: var(--pico-background-color);
  border-bottom: 1px solid var(--pico-muted-border-color);
}
.progress-bar progress {
  flex: 1;
  margin: 0;
}
.progress-bar span {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
/* Anchored rows land below the sticky bar. */
.ex-table tr.q {
  scroll-margin-top: 4rem;
}
.answer-ok {
  display: block;
  text-align: right;
  font-weight: bold;
  font-variant-numeric: tabular-nums;
  color: var(--ok);
}
button.tip-button {
  width: auto;
  margin: 0.25rem 0 0;
  padding: 0.15rem 0.75rem;
  font-size: 0.85em;
  border-radius: 1rem;
  background: transparent;
  color: var(--pico-primary);
  border: 1px solid var(--pico-primary);
}
.ex-card {
  padding: 1rem;
  margin-bottom: 1rem;
}
.ex-card-title {
  display: block;
  font-weight: bold;
  margin-bottom: 0.5rem;
}
.ex-card-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.ex-card-row [role='button'] {
  margin: 0;
}
.ex-card-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

/* Phones: each row becomes label + rate on one line, the answer field on its own full-width line. */
@media (max-width: 640px) {
  .ex-table thead {
    display: none;
  }
  .ex-table tr {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    border-bottom: 1px solid var(--pico-table-border-color);
  }
  .ex-table td {
    border: none;
  }
  .ex-table tr.given {
    background: var(--pico-card-sectioning-background-color);
  }
  .ex-table tr.q-ok {
    background: var(--ok-bg);
  }
  .ex-table tr.q-ko {
    background: var(--err-bg);
  }
  .ex-table tr > td {
    background: transparent !important;
  }
  .ex-table tr.q > td:last-child,
  .ex-table tr.tip > td {
    grid-column: 1 / -1;
    padding-top: 0;
  }
  .ex-table form.answer input,
  .ex-table form.answer select {
    min-width: 0;
    /* 16px or more: iOS zooms into smaller fields on focus. */
    font-size: max(1rem, 16px);
  }
  .ex-table tr.q-ok > td:last-child {
    grid-column: auto;
    padding-top: 0.75rem;
  }
  .ex-table tr.q-ok .muted,
  .ex-table tr.q-ok br {
    display: none;
  }
  body > header,
  body > main {
    padding-inline: 0.75rem;
  }
  body > header nav {
    font-size: 0.9rem;
  }
  body > header nav ul {
    margin: 0;
  }
  body > header nav li {
    padding-block: 0.5rem;
  }
  body > header nav form.inline {
    margin: 0;
  }
  .user-name {
    display: none;
  }
  .ex-title {
    font-size: 1.5rem;
  }
  .ex-table td {
    padding-inline: 0.5rem;
  }
}
table.results th {
  font-size: 0.8em;
  max-width: 8rem;
}
input.position {
  width: 5rem;
  margin: 0;
  text-align: right;
}
h3.attempt-title {
  font-size: 1rem;
  margin: 1rem 0 0.25rem;
}
code.seed {
  font-size: 0.8em;
}
fieldset.line-modes table td {
  padding-block: 0.25rem;
}
fieldset.line-modes select {
  margin: 0;
  min-width: 9rem;
}
form.seed-form {
  max-width: 32rem;
}
form.seed-form fieldset {
  margin-bottom: 0.25rem;
}
a.seed-link {
  text-decoration: none;
}
button.danger,
[role='button'].danger {
  background: var(--err);
  border-color: var(--err);
  color: #fff;
}
[role='button'].danger.outline {
  background: transparent;
  color: var(--err);
}
a.danger-link {
  color: var(--err);
}
.warn {
  color: var(--err);
}
.narrow-wide {
  max-width: 40rem;
}
table.assign-grid th.center,
table.assign-grid td.center {
  text-align: center;
}
table.assign-grid td.center input {
  margin: 0;
}
table.assign-grid th {
  font-size: 0.85em;
}
table.assign-grid th.center {
  max-width: 6rem;
  hyphens: auto;
}
form.filter {
  max-width: 20rem;
}

/* Printable sheet: six cards (QR + name) per A4 page. */
.qr-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  gap: 1rem;
}
.qr-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  border: 1px dashed var(--pico-muted-border-color);
  padding: 0.75rem;
  break-inside: avoid;
}
.qr-card svg {
  width: 100%;
  max-width: 12rem;
  height: auto;
}

@media print {
  .qr-cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .qr-card {
    height: 8.5cm;
  }
  body > header,
  .no-print {
    display: none;
  }
  .qr-sheet {
    box-shadow: none;
  }
}