/* Mock Exam v3 — exam-only styles.
   Uses variables from /css/style.css and /css/lesson.css where available. */

.hidden { display: none !important; }

.exam-container {
  width: min(980px, calc(100% - 28px));
  margin-inline: auto;
}

.exam-start,
.exam-paper,
.exam-done {
  min-height: 100vh;
  background: var(--bg-primary, #f8fafb);
  color: var(--text-primary, #1a1d23);
}

.exam-start { padding: 42px 0 80px; }
.exam-paper { padding: 16px 0 80px; }
.exam-done { padding: 56px 0; }

.exam-card {
  background: var(--bg-card, #fff);
  border: 1px solid var(--border, rgba(0,0,0,.08));
  border-radius: var(--radius-lg, 12px);
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,.06));
}

.exam-start-card { padding: clamp(22px, 4vw, 34px); }

.exam-kicker {
  color: var(--clr-tea, #0d9488);
  font-family: var(--font-code, ui-monospace, monospace);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.exam-start h1 {
  margin: .35rem 0 .3rem;
  font-size: clamp(1.9rem, 5vw, 2.7rem);
  line-height: 1.1;
}

.exam-muted { color: var(--text-secondary, #4b5563); }
.exam-small { font-size: .86rem; }

.exam-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 24px 0;
  border: 1px solid var(--border, #ddd);
  border-radius: var(--radius-md, 8px);
  overflow: hidden;
}

.exam-facts > div {
  padding: 14px 16px;
  border-right: 1px solid var(--border, #ddd);
}
.exam-facts > div:last-child { border-right: 0; }
.exam-facts dt {
  font-size: .74rem;
  color: var(--text-muted, #7a8494);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.exam-facts dd {
  margin: 0;
  font: 700 1.4rem/1.3 var(--font-code, ui-monospace, monospace);
}

.exam-rules { padding-left: 1.25rem; line-height: 1.55; }
.exam-rules li { margin: .4rem 0; }

.candidate-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 14px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--border, #ddd);
}

.candidate-grid label,
.exam-field {
  display: grid;
  gap: 6px;
}
.candidate-grid label > span,
.exam-field-label {
  font-weight: 700;
  color: var(--text-primary, #1a1d23);
}

input,
textarea,
select {
  font: inherit;
}

.candidate-grid input,
.answer-control {
  width: 100%;
  border: 1px solid var(--border-hover, #aeb7c2);
  border-radius: var(--radius-md, 8px);
  background: var(--bg-secondary, #fff);
  color: var(--text-primary, #1a1d23);
  padding: 10px 12px;
}

.answer-control:focus,
.candidate-grid input:focus {
  outline: 2px solid color-mix(in srgb, var(--clr-tea, #0d9488) 55%, transparent);
  outline-offset: 1px;
  border-color: var(--clr-tea, #0d9488);
}

textarea.answer-control {
  min-height: 96px;
  resize: vertical;
  line-height: 1.5;
}

textarea.working-answer,
textarea.code-answer {
  min-height: 130px;
  font-family: var(--font-code, ui-monospace, monospace);
  tab-size: 4;
}

.exam-error {
  min-height: 1.4em;
  color: #b42318;
  margin: 12px 0 0;
}

.exam-actions,
.exam-footer-actions,
.dialog-actions,
.done-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.exam-actions { margin-top: 16px; }
.exam-footer-actions {
  justify-content: space-between;
  margin-top: 20px;
  padding-bottom: 50px;
}

.exam-btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--radius-md, 8px);
  padding: 10px 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform .15s ease, opacity .15s ease, background .15s ease;
}
.exam-btn:hover { transform: translateY(-1px); }
.exam-btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }

.exam-btn-primary {
  color: #fff;
  background: var(--clr-tea, #0d9488);
  border-color: var(--clr-tea, #0d9488);
}
.exam-btn-secondary {
  color: var(--text-primary, #1a1d23);
  background: var(--bg-secondary, #fff);
  border-color: var(--border-hover, #aeb7c2);
}

.exam-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: #111827;
  color: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,.18);
}

.exam-bar-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 10px 0;
}

.candidate-mini { min-width: 0; }
.candidate-mini strong {
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.candidate-mini span {
  display: block;
  color: #c7ced8;
  font-size: .78rem;
}

.exam-timer {
  flex: none;
  font: 700 1.8rem/1 var(--font-code, ui-monospace, monospace);
  font-variant-numeric: tabular-nums;
}
.exam-timer.warn { color: #fbbf24; }
.exam-timer.danger { color: #ff8a80; }

.exam-qnav {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 0 0 10px;
}
.exam-qnav a {
  flex: 0 0 auto;
  width: 36px;
  height: 31px;
  display: grid;
  place-items: center;
  border: 1px solid #526071;
  border-radius: 6px;
  color: #e5e7eb;
  text-decoration: none;
  font-size: .82rem;
}
.exam-qnav a.done {
  background: #d9efe1;
  border-color: #d9efe1;
  color: #174b2b;
}
.exam-qnav a.partial {
  background: #fff4d6;
  border-color: #fff4d6;
  color: #6f4a00;
}

.exam-paper-head {
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}
.exam-paper-head h2 { margin: 3px 0 0; font-size: 1.2rem; }
.save-status { color: var(--text-secondary, #4b5563); font-size: .82rem; text-align: right; }

.exam-question {
  background: var(--bg-card, #fff);
  border: 1px solid var(--border, #ddd);
  border-radius: var(--radius-lg, 12px);
  padding: clamp(16px, 3vw, 24px);
  margin: 14px 0;
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,.04));
  scroll-margin-top: 118px;
}

.question-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 12px;
}
.question-head h3 { margin: 0; font-size: 1.25rem; }
.question-topic {
  margin-top: 3px;
  color: var(--text-muted, #7a8494);
  font-size: .78rem;
}
.question-marks,
.part-marks {
  white-space: nowrap;
  color: var(--text-secondary, #4b5563);
  font-weight: 700;
}
.question-intro {
  color: var(--text-secondary, #4b5563);
  margin: 0 0 10px;
}

.exam-part {
  margin: 20px 0 24px;
  padding-top: 2px;
}
.part-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 10px;
}
.part-label { font-weight: 800; margin-right: .35rem; }
.part-prompt { line-height: 1.55; }

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px;
}

.codebox {
  margin: 10px 0 12px;
  padding: 13px 14px;
  border: 1px solid var(--border, #ddd);
  border-radius: var(--radius-md, 8px);
  background: var(--bg-code, #f1f5f9);
  color: var(--text-primary, #1a1d23);
  overflow-x: auto;
  white-space: pre-wrap;
  font: .9rem/1.5 var(--font-code, ui-monospace, monospace);
}

.exam-dialog {
  width: min(470px, calc(100% - 24px));
  border: 1px solid var(--border, #ddd);
  border-radius: var(--radius-lg, 12px);
  padding: 24px;
  background: var(--bg-secondary, #fff);
  color: var(--text-primary, #1a1d23);
}
.exam-dialog::backdrop { background: rgba(0,0,0,.48); }
.exam-dialog h3 { margin-top: 0; }
.dialog-actions { justify-content: flex-end; }

.exam-done .exam-card { padding: 26px; }
.exam-done h1 { margin-top: 0; }
.receipt {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 18px;
  width: max-content;
  max-width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--border, #ddd);
  border-radius: var(--radius-md, 8px);
  margin: 18px 0;
}
.receipt dt { color: var(--text-secondary, #4b5563); }
.receipt dd { margin: 0; font-weight: 700; overflow-wrap: anywhere; }

.exam-toast {
  position: fixed;
  left: 50%;
  bottom: max(22px, env(safe-area-inset-bottom));
  z-index: 999;
  max-width: min(520px, calc(100% - 30px));
  transform: translate(-50%, 18px);
  opacity: 0;
  pointer-events: none;
  padding: 10px 14px;
  border-radius: 999px;
  background: #111827;
  color: #fff;
  font-size: .86rem;
  box-shadow: 0 8px 28px rgba(0,0,0,.25);
  transition: opacity .18s ease, transform .18s ease;
}
.exam-toast.show { opacity: 1; transform: translate(-50%, 0); }

/* Anti-copy UX: questions cannot normally be selected.
   Students can still select/edit text they typed themselves. */
.exam-lock,
.exam-lock .exam-question,
.exam-lock .exam-bar,
.exam-lock .exam-paper-head {
  -webkit-user-select: none;
  user-select: none;
}
.exam-lock input,
.exam-lock textarea,
.exam-lock select,
.exam-lock .answer-control {
  -webkit-user-select: text;
  user-select: text;
}

/* Make printing unattractive during an active exam. This is not a security boundary. */
@media print {
  .exam-bar,
  .exam-footer-actions,
  .save-status,
  .exam-toast { display: none !important; }
  .exam-question { break-inside: avoid; box-shadow: none; }
}

@media (max-width: 680px) {
  .exam-facts,
  .candidate-grid { grid-template-columns: 1fr; }
  .exam-facts > div { border-right: 0; border-bottom: 1px solid var(--border, #ddd); }
  .exam-facts > div:last-child { border-bottom: 0; }
  .exam-paper-head,
  .question-head,
  .part-head,
  .exam-footer-actions { align-items: stretch; flex-direction: column; }
  .save-status { text-align: left; }
  .exam-btn { width: 100%; }
  .exam-timer { font-size: 1.55rem; }
}

.server-error-details {
  margin: 14px 0 18px;
  padding: 12px 14px;
  border: 1px solid #f0b8b3;
  border-radius: var(--radius-md, 8px);
  background: #fff5f4;
  color: #7a271a;
  overflow-wrap: anywhere;
}
.server-error-details strong {
  display: block;
  margin-bottom: 6px;
}
.server-error-details code {
  font-family: var(--font-code, ui-monospace, monospace);
  white-space: pre-wrap;
}