/* TABot: phone-first, one column, calm. Every style lives here; the page's
   Content-Security-Policy forbids inline styles. */

:root {
  --bg: #f4f3ef;
  --surface: #ffffff;
  --text: #1c1e22;
  --muted: #555b66;
  --line: #d8d5cc;
  --field: #ffffff;
  --accent: #1d5c8a;
  --accent-hover: #174c73;
  --accent-text: #ffffff;
  --accent-soft: #e4eef6;
  --secondary-text: #1d5c8a;
  --error: #9c2518;
  --error-soft: #fcebe8;
  --warn-soft: #fff5d9;
  --warn-line: #d9b24a;
  --focus: #f0a500;
  --radius: 14px;
  --tap: 48px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --surface: #1f2226;
    --text: #eceae4;
    --muted: #a7abb3;
    --line: #3a3e45;
    --field: #17191c;
    --accent: #5aa3d6;
    --accent-hover: #74b4e1;
    --accent-text: #0e1114;
    --accent-soft: #1d2b36;
    --secondary-text: #8cc3ea;
    --error: #ff9c8f;
    --error-soft: #3a1f1c;
    --warn-soft: #3a3120;
    --warn-line: #a88a3a;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.5;
  overflow-wrap: break-word;
}

.masthead,
main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 0 16px;
}

.masthead {
  padding-top: 24px;
}

h1 {
  margin: 0;
  font-size: 1.9rem;
  letter-spacing: -0.01em;
}

.lede {
  margin: 4px 0 0;
  color: var(--muted);
}

main {
  padding-bottom: 48px;
}

/* ---- steps ---- */

.step {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 16px 22px;
  margin: 18px 0;
}

.step h2 {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  font-size: 1.3rem;
  line-height: 1.2;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 1rem;
  font-weight: 700;
}

/* ---- fields ---- */

.field {
  margin: 0 0 16px;
  min-width: 0;
}

.field-after {
  margin-top: 18px;
}

label,
.label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
}

.provider {
  margin: 0;
  font-size: 1.05rem;
}

input[type="text"],
input[type="password"],
input[type="number"],
select {
  display: block;
  width: 100%;
  min-width: 0;
  min-height: var(--tap);
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--field);
  color: var(--text);
  /* 17px keeps iOS Safari from zooming the page when a field takes focus. */
  font: inherit;
  font-size: 17px;
}

/* Safari draws a native select at its own small height; a plain box with a
   drawn chevron keeps it the same big tap target as the other fields. */
select {
  -webkit-appearance: none;
  appearance: none;
  padding-right: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23555b66' stroke-width='2'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}

@media (prefers-color-scheme: dark) {
  select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23a7abb3' stroke-width='2'/%3E%3C/svg%3E");
  }
}

input:disabled,
select:disabled {
  opacity: 0.6;
}

input:focus-visible,
select:focus-visible,
button:focus-visible,
a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.field-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 12px;
}

.hint {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.status {
  margin: 12px 0 0;
  font-weight: 500;
}

.status:empty {
  display: none;
}

.error {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-left: 4px solid var(--error);
  border-radius: 8px;
  background: var(--error-soft);
  color: var(--text);
}

.error p {
  margin: 0;
  font-weight: 600;
}

.error ul {
  margin: 8px 0 0;
  padding-left: 1.2em;
}

/* Storage messages sit in the page's flow, never over it: the banner at the
   top of the masthead for a problem known as the page loads, and a note
   below the control whose store call found one later (app.js tellStorage).
   A note only ever appears below the control, so it never moves it. */
.banner,
.note {
  padding: 12px 14px;
  border: 1px solid var(--warn-line);
  border-radius: 10px;
  background: var(--warn-soft);
}

.banner {
  margin: 0 0 16px;
}

.note {
  margin: 12px 0 0;
}

/* ---- answer key ---- */

.questions {
  margin-top: 4px;
}

/* On a phone each question takes two lines: the answer keeps most of the
   width on the first, with points beside it, and the match setting sits
   under the answer. From 640px wide they share one line. */
.q-row {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr) 4.6rem;
  grid-template-areas:
    "label answer points"
    ".     match  match";
  column-gap: 8px;
  row-gap: 6px;
  align-items: center;
  margin-bottom: 14px;
}

.q-label {
  grid-area: label;
  font-weight: 700;
}

.q-answer {
  grid-area: answer;
}

.q-points {
  grid-area: points;
}

.q-match {
  grid-area: match;
}

.q-head {
  grid-template-areas: "label answer points";
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.q-head .q-label {
  font-weight: inherit;
}

.q-head .q-match {
  display: none;
}

/* Compact, and still a 44px tap target; 16px text keeps iOS Safari from
   zooming when it opens. */
select.q-match {
  justify-self: start;
  width: 8.5rem;
  min-height: 44px;
  padding: 8px 30px 8px 10px;
  font-size: 16px;
  background-position: right 10px center;
}

@media (min-width: 640px) {
  .q-row {
    grid-template-columns: 2.6rem minmax(0, 1fr) 4.6rem 8.5rem;
    grid-template-areas: "label answer points match";
    margin-bottom: 8px;
  }

  .q-head .q-match {
    display: block;
  }
}

/* ---- buttons ---- */

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: var(--tap);
  margin: 0;
  padding: 12px 20px;
  border: 2px solid var(--accent);
  border-radius: 12px;
  font: inherit;
  font-weight: 650;
  text-align: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--secondary-text);
}

.btn-secondary:hover {
  background: var(--accent-soft);
}

.btn-small {
  width: auto;
  min-height: 44px;
  padding: 8px 14px;
  font-size: 0.95rem;
}

.btn:disabled,
.btn.is-disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn:disabled:hover,
.btn.is-disabled:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.btn-secondary:disabled:hover,
.btn-secondary.is-disabled:hover {
  background: transparent;
}

/* ---- photos ---- */

.tips {
  margin: 0 0 18px;
  padding-left: 1.2em;
}

.tips li {
  margin-bottom: 4px;
}

.capture {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

/* The real file inputs stay in the page (and keyboard reachable) but take no
   room; their labels are the big buttons. */
.file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
  clip-path: inset(50%);
}

.file-input:focus-visible + .btn {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.capture .btn {
  min-height: 56px;
  font-size: 1.05rem;
}

@media (min-width: 480px) {
  .capture {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

/* What the queue is waiting on right now: a 429 backoff, or no answer. */
.status-wait {
  color: var(--muted);
  font-weight: 400;
}

.stop-reading {
  margin-top: 12px;
}

/* ---- results ---- */

.photo-group {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.photo-group:first-child {
  margin-top: 8px;
}

.photo-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.photo-head h3 {
  margin: 0;
  font-size: 1.1rem;
}

.photo-count {
  color: var(--muted);
  font-weight: 400;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.results-table th,
.results-table td {
  padding: 10px 6px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}

.results-table th {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.results-table .col-student {
  width: 50%;
}

.results-table .col-score {
  width: 22%;
}

.results-table .col-flags {
  width: 28%;
}

.results-table .num {
  font-variant-numeric: tabular-nums;
}

.results-table .flag {
  color: var(--error);
  font-weight: 600;
}

/* ---- confirm panels ---- */

.confirm {
  margin-top: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--accent-soft);
}

.confirm p {
  margin: 0 0 12px;
  font-weight: 600;
}

.confirm-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

@media (min-width: 480px) {
  .confirm-actions {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}