/* Student exam UI — one question at a time (dark theme) */

.exam-shell {
  max-width: 640px;
  margin: 0 auto;
  padding: 8px 0 32px;
}

.exam-card {
  background: var(--surface, #1e221e);
  border: 1px solid var(--border, rgba(255,255,255,0.08));
  border-radius: 16px;
  padding: 20px 18px 16px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
}

.exam-head {
  text-align: center;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border, rgba(255,255,255,0.08));
}

.exam-brand {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  font-weight: 700;
  color: var(--accent, #70db97);
  margin-bottom: 6px;
}

.exam-title {
  margin: 0 0 10px;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text, #f2f4f1);
}

.exam-meta {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.exam-chip {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  color: var(--muted, #9aa39a);
  font-size: 0.8rem;
  font-weight: 600;
}

.exam-chip.accent {
  background: var(--accent-dim, rgba(112, 219, 151, 0.15));
  color: var(--accent, #70db97);
}

.exam-body {
  min-height: 220px;
}

.exam-q-num {
  font-size: 0.85rem;
  color: var(--muted, #9aa39a);
  margin-bottom: 8px;
  font-weight: 600;
}

.exam-q-text,
.exam-q {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.45;
  margin: 0 0 16px;
  color: var(--text, #f2f4f1);
}

.exam-opts {
  display: grid;
  gap: 10px;
}

/* A–D options: JS uses .exam-opt; CSS also supports .exam-opt-btn */
.exam-opt,
.exam-opt-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  text-align: left;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border, rgba(255,255,255,0.12));
  background: var(--bg, #141614) !important;
  color: var(--text, #f2f4f1) !important;
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1.4;
  transition: border-color 0.15s, background 0.15s;
  box-sizing: border-box;
}

.exam-opt:hover,
.exam-opt-btn:hover {
  border-color: rgba(112, 219, 151, 0.45);
  background: var(--surface-2, #1a221c) !important;
}

.exam-opt.selected,
.exam-opt-btn.selected {
  border-color: var(--accent, #70db97);
  background: var(--accent-dim, rgba(112, 219, 151, 0.15)) !important;
}

.exam-opt .opt-letter,
.exam-opt-letter {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 0.85rem;
  background: rgba(255,255,255,0.08);
  color: var(--muted, #9aa39a);
}

.exam-opt.selected .opt-letter,
.exam-opt-btn.selected .exam-opt-letter,
.exam-opt.selected .exam-opt-letter {
  background: var(--accent, #70db97);
  color: #0c1510;
}

.exam-opt-label {
  flex: 1;
  padding-top: 3px;
}

/* Short / text answer */
.exam-text-input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  min-height: 48px;
  color: var(--text, #e8ece7) !important;
  background: var(--surface-2, #1a221c) !important;
  border: 1px solid var(--border, #2a362e);
  border-radius: 10px;
  padding: 0.75rem 0.9rem;
  font-size: 1rem;
  outline: none;
}

.exam-text-input:focus {
  border-color: rgba(112, 219, 151, 0.55);
  box-shadow: 0 0 0 3px var(--accent-dim, rgba(112, 219, 151, 0.14));
}

.exam-text-input::placeholder {
  color: var(--muted, #9aa39a);
}

/* Matching */
.exam-match {
  display: grid;
  gap: 12px;
}

.exam-match-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border, rgba(255,255,255,0.08));
  background: var(--bg, #141614);
}

.match-left {
  flex: 1 1 140px;
  color: var(--text, #f2f4f1);
  font-weight: 600;
  font-size: 0.95rem;
}

.match-select {
  flex: 1 1 160px;
  min-width: 140px;
  min-height: 42px;
  color: var(--text, #e8ece7) !important;
  background: var(--surface-2, #1a221c) !important;
  border: 1px solid var(--border, #2a362e);
  border-radius: 10px;
  padding: 0.5rem 0.75rem;
  font-size: 0.95rem;
  outline: none;
  cursor: pointer;
}

.match-select:focus {
  border-color: rgba(112, 219, 151, 0.55);
  box-shadow: 0 0 0 3px var(--accent-dim, rgba(112, 219, 151, 0.14));
}

.match-select option {
  background: var(--surface, #1c211c);
  color: var(--text, #f2f4f1);
}

/* Nav */
.exam-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border, rgba(255,255,255,0.08));
}

/* Language select — match dark topbar */
#pfLang,
.pf-lang {
  appearance: none;
  -webkit-appearance: none;
  background: var(--surface-2, #262c26);
  color: var(--text, #f2f4f1);
  border: 1px solid var(--border, rgba(255, 255, 255, 0.09));
  border-radius: 11px;
  padding: 8px 12px;
  height: 38px;
  min-height: 38px;
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  vertical-align: middle;
  margin-right: 8px;
}
#pfLang:hover,
.pf-lang:hover {
  background: #303830;
  border-color: rgba(255, 255, 255, 0.14);
}
#pfLang:focus,
.pf-lang:focus {
  outline: none;
  border-color: rgba(112, 219, 151, 0.55);
  box-shadow: 0 0 0 3px var(--accent-dim, rgba(112, 219, 151, 0.14));
}
#pfLang option,
.pf-lang option {
  background: var(--surface, #1c211c);
  color: var(--text, #f2f4f1);
}

.exam-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  max-width: 48%;
  align-items: center;
}

/* Question number nav */
.exam-dot,
.exam-dots .dot,
#examDots .dot,
#examDots button {
  min-width: 36px;
  min-height: 36px;
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 10px;
  border: 1px solid var(--border, rgba(255, 255, 255, 0.12));
  background: var(--bg, #141614);
  color: var(--text, #f2f4f1);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.exam-dot:hover,
.exam-dots .dot:hover,
#examDots .dot:hover,
#examDots button:hover {
  background: var(--surface-2, #262c26);
  border-color: rgba(112, 219, 151, 0.4);
  color: var(--accent, #70db97);
}
.exam-dot.answered,
.exam-dot.done,
.exam-dots .dot.done,
#examDots .dot.done {
  background: rgba(112, 219, 151, 0.18);
  border-color: rgba(112, 219, 151, 0.35);
  color: var(--accent, #70db97);
}
.exam-dot.current,
.exam-dots .dot.active,
#examDots .dot.active,
#examDots button.active {
  background: var(--accent, #70db97);
  border-color: var(--accent, #70db97);
  color: #0c1510;
  box-shadow: 0 0 0 2px rgba(112, 219, 151, 0.25);
}
.exam-dot.current:hover,
.exam-dots .dot.active:hover,
#examDots .dot.active:hover {
  background: var(--accent-hover, #5fcf88);
  color: #0c1510;
}

.exam-footer {
  margin-top: 14px;
  text-align: center;
}

.exam-submit {
  min-width: 160px;
}

.result-card {
  max-width: 420px;
  margin: 24px auto;
}

.result-card,
.card.highlight.result-card,
.card.highlight {
  background: var(--surface, #141b16) !important;
  border: 1px solid var(--border, #2a362e) !important;
  color: var(--text, #e8ece7) !important;
  box-shadow: none !important;
}
.score-big {
  color: var(--accent, #70db97);
  font-size: 2.4rem;
  font-weight: 800;
}

@media (max-width: 768px) {
  .exam-shell {
    padding: 8px 10px 28px;
  }
  .exam-card {
    padding: 16px 14px 14px;
    border-radius: 14px;
  }
  .exam-title {
    font-size: 1.08rem;
    line-height: 1.35;
  }
  .exam-q-text,
  .exam-q {
    font-size: 1.02rem;
    line-height: 1.5;
  }
  .exam-opt,
  .exam-opt-btn {
    min-height: 48px;
    padding: 14px 14px;
    font-size: 0.98rem;
    gap: 14px;
  }
  .exam-opt .opt-letter,
  .exam-opt-letter {
    width: 32px;
    height: 32px;
    font-size: 0.9rem;
  }
  .exam-nav {
    gap: 6px;
    flex-wrap: wrap;
  }
  .exam-nav .btn {
    min-height: 44px;
    padding: 10px 14px;
    font-size: 0.9rem;
  }
  .exam-dots {
    max-width: 100%;
    order: 3;
    width: 100%;
    justify-content: center;
    margin-top: 6px;
    gap: 8px;
  }
  .exam-dot,
  .exam-dots .dot,
  #examDots .dot,
  #examDots button {
    min-width: 40px;
    min-height: 40px;
    width: 40px;
    height: 40px;
    font-size: 0.9rem;
  }
  #pfLang,
  .pf-lang {
    height: 40px;
    min-height: 40px;
  }
  .exam-submit {
    min-height: 48px;
    width: 100%;
    max-width: 100%;
  }
  .exam-text-input,
  .match-select {
    min-height: 44px;
    font-size: 16px;
    width: 100%;
  }
  .oly-card .btn,
  .cards .btn {
    min-height: 44px;
  }
}

@media (max-width: 520px) {
  .exam-card { padding: 14px 12px; border-radius: 12px; }
  .exam-title { font-size: 1.02rem; }
  .exam-nav .btn { padding: 10px 12px; font-size: 0.88rem; }
  .exam-body { min-height: 180px; }
  .exam-meta { gap: 6px; }
  .exam-chip { font-size: 0.75rem; padding: 4px 10px; }
  .exam-match-row { flex-direction: column; align-items: stretch; }
  .match-select { width: 100%; }
}