/* Dental Qbank: one stylesheet for every page (home, exam, enter, locked).
   Same family as Joe's qbank (same tokens and components), with a violet
   accent so it is recognisably its own site. Violet is deliberately not a
   "right/wrong" colour: a picked option is violet, and green and red appear
   only once a question is answered (and on the end screen).
   Phone-first: 44px+ touch targets, no horizontal scroll, safe-area insets for
   iOS standalone, light and dark via prefers-color-scheme. No inline styles
   anywhere (the CSP blocks them); initial hidden states use the .hidden class. */

:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --surface: var(--panel);
  --text: #1a1d21;
  --muted: #5c636e;
  --border: #d8dce2;
  --accent: #5b3fd1;
  --accent-text: #ffffff;
  --accent-soft: #ece8fd;
  --correct-bg: #e4f6e9;
  --correct-border: #35a35c;
  --correct-text: #14622f;
  --wrong-bg: #fbe6e6;
  --wrong-border: #d04545;
  --wrong-text: #8a1f1f;
  --flag-bg: #fff3d6;
  --flag-border: #e0a92b;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.05);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c;
    --panel: #1e232b;
    --text: #e8eaed;
    --muted: #9aa2ad;
    --border: #333a44;
    --accent: #a08cff;
    --accent-text: #0b0e12;
    --accent-soft: #2b2547;
    --correct-bg: #16311f;
    --correct-border: #3fae65;
    --correct-text: #8fe3ab;
    --wrong-bg: #3a1a1a;
    --wrong-border: #d76a6a;
    --wrong-text: #f0a9a9;
    --flag-bg: #3a3117;
    --flag-border: #d8ad3f;
    --shadow: 0 1px 3px rgba(0,0,0,0.4), 0 4px 12px rgba(0,0,0,0.3);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.5;
  overflow-x: hidden;
}

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: calc(20px + var(--safe-top)) calc(16px + var(--safe-right)) calc(56px + var(--safe-bottom)) calc(16px + var(--safe-left));
}

h1 { font-size: 1.7rem; margin: 0.2em 0 0.1em; overflow-wrap: break-word; }
h2 { font-size: 1.3rem; margin: 1.2em 0 0.4em; }
h3 { font-size: 1.05rem; margin: 1em 0 0.3em; color: var(--muted); }
.panel > h2:first-child, .panel > h3:first-child { margin-top: 0; }
.subtitle { color: var(--muted); margin: 0 0 1.2em; }
.subtitle a { display: inline-block; min-height: 44px; line-height: 44px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin: 14px 0;
  box-shadow: var(--shadow);
}

button, .btnlink {
  font-size: 1rem;
  font-family: inherit;
  min-height: 48px;
  padding: 12px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.btnlink { display: inline-flex; align-items: center; text-decoration: none; }
button:hover, .btnlink:hover { border-color: var(--accent); }
button.primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
  font-weight: 600;
}
button.primary:hover { filter: brightness(1.05); }
button.danger { background: var(--wrong-bg); border-color: var(--wrong-border); color: var(--wrong-text); font-weight: 600; }
button:disabled { opacity: 0.5; cursor: default; }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

a { color: var(--accent); }

.btnrow { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }

.toggle-row { display: flex; align-items: center; gap: 10px; padding: 10px 4px; min-height: 48px; cursor: pointer; }
.toggle-row input { width: 22px; height: 22px; flex: none; accent-color: var(--accent); margin: 0; }

table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--border); overflow-wrap: break-word; }
th { color: var(--muted); font-weight: 600; }
tfoot th { color: var(--text); border-bottom: none; }
td.num, th.num { text-align: right; white-space: nowrap; }

.muted { color: var(--muted); }
.hidden { display: none !important; }
.loading { margin: 18px 0; }

/* ---------- home screen exam cards ---------- */
.bank-list { display: flex; flex-direction: column; gap: 14px; margin-top: 6px; }
.bank-card {
  display: block;
  width: 100%;
  text-align: left;
  text-decoration: none;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 18px;
  cursor: pointer;
}
.bank-card:hover { border-color: var(--accent); }
.bank-card:active { transform: translateY(1px); }
.bank-card .bank-title { font-size: 1.25rem; font-weight: 700; display: flex; align-items: center; flex-wrap: wrap; gap: 8px; overflow-wrap: anywhere; }
.bank-card .bank-desc { color: var(--muted); font-size: 0.95rem; margin: 6px 0 10px; }
.bank-card .bank-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; font-size: 0.9rem; color: var(--muted); }
.bank-card .bank-meta .val { color: var(--text); font-weight: 600; }
.resume-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--flag-bg);
  border: 1px solid var(--flag-border);
  color: var(--text);
}

/* ---------- start screen ---------- */
.start-desc { margin: 0 0 12px; }
.start-note { font-size: 0.92rem; margin: 14px 0 4px; }

/* ---------- question screen ---------- */
.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 10px;
}
.topbar .section-label { font-weight: 600; color: var(--text); flex-basis: 100%; }
.topbar .answered-count { margin-left: auto; }
.progressbar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 18px;
}
.progressbar > div { height: 100%; background: var(--accent); width: 0; transition: width 0.2s; }
.resume-notice { font-size: 0.85rem; color: var(--muted); margin: -8px 0 14px; }
.question {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 8px 0 18px;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  word-break: break-word;
}
.options { display: flex; flex-direction: column; gap: 10px; }
.option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  text-align: left;
  width: 100%;
  min-height: 52px;
  padding: 14px 16px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
  color: var(--text);
  font-size: 1.02rem;
  line-height: 1.4;
  cursor: pointer;
  overflow-wrap: break-word;
  word-break: break-word;
  white-space: normal;
}
.option .key {
  flex: none;
  width: 28px; height: 28px;
  border-radius: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.85rem; font-weight: 700; color: var(--muted);
}
.option .opttext { flex: 1; min-width: 0; }
/* Selected = her current pick. Violet, never green or red: it says "chosen",
   not "right". */
.option.selected { border-color: var(--accent); border-width: 2px; background: var(--accent-soft); padding: 13.5px 15.5px; }
.option.selected .key { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
@media (hover: hover) { .option:not(.locked):hover { border-color: var(--accent); } }
/* Answered (locked) options reuse the end-screen review colours. */
.option.locked { cursor: default; }
.option.correct { background: var(--correct-bg); border-color: var(--correct-border); border-width: 2px; padding: 13.5px 15.5px; color: var(--correct-text); font-weight: 600; }
.option.wrong { background: var(--wrong-bg); border-color: var(--wrong-border); border-width: 2px; padding: 13.5px 15.5px; color: var(--wrong-text); }
.option.correct .key { background: var(--correct-border); border-color: var(--correct-border); color: #fff; }
.option.wrong .key { background: var(--wrong-border); border-color: var(--wrong-border); color: #fff; }
.check-feedback { margin-top: 14px; }
.check-feedback .explain-block { margin-top: 8px; }
/* "Final exam topic:" and "This question tests:" lines under the explanation. */
.meta-line { font-size: 0.9rem; margin: 8px 0 0; overflow-wrap: break-word; word-break: break-word; }
.meta-line .lbl { color: var(--muted); font-weight: 600; }

.qnav { margin-top: 18px; }
.qnav #btn-back { flex: 1 1 0; }
.qnav #btn-flag { flex: 1 1 0; }
.qnav #btn-next { flex: 1.4 1 0; }
.qnav button { white-space: nowrap; padding-left: 10px; padding-right: 10px; }
.flagbtn { border-color: var(--flag-border); }
.flagbtn.on { background: var(--flag-bg); border-color: var(--flag-border); color: var(--text); font-weight: 600; }

.savebar { border-top: 1px solid var(--border); padding-top: 14px; margin-top: 18px; }
.savebar button { flex: 1 1 0; }
.save-note { font-size: 0.88rem; min-height: 1.3em; margin: 8px 0 0; }
.confirm-panel { border-color: var(--accent); }
.confirm-panel p { margin: 0.3em 0; }

/* Navigator grid. Cells are 44px+ squares; the grid scrolls inside its own
   panel so an exam of 100+ questions never makes the page endless. */
.grid-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 0.85rem; color: var(--muted); margin-bottom: 10px; }
.grid-legend > span { display: inline-flex; align-items: center; gap: 6px; }
.swatch { display: inline-block; width: 16px; height: 16px; border-radius: 4px; border: 1.5px solid var(--border); background: var(--panel); position: relative; }
.swatch-right { background: var(--correct-bg); border-color: var(--correct-border); }
.swatch-wrong { background: var(--wrong-bg); border-color: var(--wrong-border); }
.swatch-flagged { border-color: var(--flag-border); background: var(--flag-bg); }
.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(46px, 1fr));
  gap: 6px;
  max-height: min(52vh, 360px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 3px;
}
.nav-cell {
  position: relative;
  min-height: 46px;
  min-width: 0;
  padding: 0;
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
}
.nav-cell.is-answered { background: var(--accent-soft); border-color: var(--accent); font-weight: 600; }
.nav-cell.is-right { background: var(--correct-bg); border-color: var(--correct-border); color: var(--correct-text); }
.nav-cell.is-wrong { background: var(--wrong-bg); border-color: var(--wrong-border); color: var(--wrong-text); }
.nav-cell.is-flagged::after {
  content: "";
  position: absolute;
  top: 0; right: 0;
  border-style: solid;
  border-width: 0 14px 14px 0;
  border-color: transparent var(--flag-border) transparent transparent;
  border-top-right-radius: 6px;
}
.nav-cell.is-flagged:not(.is-answered) { background: var(--flag-bg); }
.nav-cell.is-current { outline: 3px solid var(--text); outline-offset: 1px; }

/* ---------- end screen ---------- */
.end-h { margin-top: 0; }
.bignum { font-size: 2.4rem; font-weight: 800; }
.filter-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 6px; }
.filter-btn { min-height: 44px; padding: 8px 14px; font-size: 0.92rem; }
.filter-btn.on { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }

.review-item { padding: 14px 0; border-bottom: 1px solid var(--border); }
.review-item:last-child { border-bottom: none; }
.review-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 10px; font-size: 0.9rem; }
.review-section { font-weight: 700; color: var(--text); }
.review-item .q { font-weight: 600; margin: 8px 0 10px; overflow-wrap: break-word; word-break: break-word; white-space: pre-wrap; }
.review-options { list-style: none; margin: 0 0 10px; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.review-options li {
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  overflow-wrap: break-word;
  word-break: break-word;
  font-size: 0.97rem;
}
.review-options li.correct { background: var(--correct-bg); border-color: var(--correct-border); color: var(--correct-text); font-weight: 600; }
.review-options li.wrong { background: var(--wrong-bg); border-color: var(--wrong-border); color: var(--wrong-text); }
.optletter { font-weight: 700; color: var(--muted); }
li.correct .optletter, li.wrong .optletter { color: inherit; }
.opt-tag { display: inline-block; font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em; margin-left: 4px; }
.pill {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--muted);
}
.pill-correct { background: var(--correct-bg); border-color: var(--correct-border); color: var(--correct-text); }
.pill-wrong { background: var(--wrong-bg); border-color: var(--wrong-border); color: var(--wrong-text); }
.pill-flag { background: var(--flag-bg); border-color: var(--flag-border); color: var(--text); }
.explain-block {
  background: var(--bg);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 8px 12px;
  margin: 6px 0 2px;
  font-size: 0.93rem;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  word-break: break-word;
}
.explain-block .lbl { display: block; color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 2px; }

/* results-save status card */
.save-status { font-size: 0.98rem; overflow-wrap: break-word; }
.save-status.ok { color: var(--correct-text); font-weight: 600; }
.save-status.pending { color: var(--muted); }
.save-status.err { color: var(--wrong-text); }

/* Copy fallbacks */
.copy-offscreen { position: fixed; top: 0; left: -9999px; width: 1px; height: 1px; opacity: 0; font-size: 16px; }
.copy-panel { margin: 12px 0 0; padding: 10px; border: 1px solid var(--flag-border); background: var(--flag-bg); border-radius: 10px; }
.copy-hint { margin: 0 0 8px; font-size: 0.9rem; }
.copy-text {
  display: block;
  width: 100%;
  height: 12em;
  font-family: inherit;
  font-size: 16px; /* keeps iOS from zooming on focus */
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  resize: vertical;
}

.linklike {
  min-height: 44px;
  padding: 0 6px;
  border: none;
  background: none;
  color: var(--muted);
  font: inherit;
  text-decoration: underline;
  cursor: pointer;
}
.linklike:hover { border: none; color: var(--text); }

/* Banner when localStorage cannot be written (created from JS). */
.storage-banner {
  background: var(--flag-bg);
  border: 1px solid var(--flag-border);
  color: var(--text);
  border-radius: 10px;
  padding: 12px 14px;
  margin: 0 0 14px;
  font-size: 0.92rem;
  line-height: 1.45;
}

/* Error card: a failed load is never a blank page. */
.error-card {
  background: var(--wrong-bg);
  border: 1px solid var(--wrong-border);
  color: var(--wrong-text);
  border-radius: 12px;
  padding: 16px;
  margin: 14px 0;
  overflow-wrap: break-word;
}
.error-card h2 { color: var(--wrong-text); margin-top: 0; }
.error-card .btnrow button { color: var(--text); }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + var(--safe-bottom));
  transform: translateX(-50%);
  max-width: calc(100vw - 32px);
  background: var(--text);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 0.9rem;
  box-shadow: var(--shadow);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
  z-index: 50;
}
.toast.show { opacity: 0.96; }

/* ---------- enter + locked pages ---------- */
.gate-body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(24px + var(--safe-top)) calc(24px + var(--safe-right)) calc(24px + var(--safe-bottom)) calc(24px + var(--safe-left));
}
.gate-card {
  width: 100%;
  max-width: 380px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-top: 4px solid var(--accent);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 28px 24px 24px;
  text-align: center;
}
.gate-title { font-size: 1.6rem; font-weight: 800; margin: 0 0 10px; }
.gate-small { font-size: 0.9rem; }
.gate-small a { display: inline-block; min-height: 44px; line-height: 44px; }
.gate-btns { justify-content: center; }

@media (max-width: 480px) {
  body { font-size: 17px; }
  .wrap { padding: calc(14px + var(--safe-top)) calc(12px + var(--safe-right)) calc(48px + var(--safe-bottom)) calc(12px + var(--safe-left)); }
  h1 { font-size: 1.4rem; }
  .question { font-size: 1.1rem; }
  .panel { padding: 14px; }
  button, .btnlink { padding: 12px 14px; }
}