/* ==========================================================================
   IELTS End-of-Class Drill — lightweight, inline, auto-graded practice.
   Driven by window.DRILL (see drill.js). Uses the master stylesheet's
   design tokens only — no overrides of styles.css.
   ========================================================================== */

.drill {
  border: 1px solid var(--ink-200);
  border-radius: var(--radius-lg);
  background: var(--paper);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

/* ---- header / timer ---- */
.drill__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  flex-wrap: wrap;
  padding: var(--sp-4) var(--sp-5);
  background: var(--navy-800);
  color: #fff;
}
.drill__head-title { font-size: 1.05rem; font-weight: 600; margin: 0; }
.drill__head-sub { font-size: 0.85rem; color: var(--blue-100); margin: var(--sp-1) 0 0; }

.drill__timer {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.drill__clock {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  min-width: 4.5ch;
  text-align: right;
}
.drill__clock.is-warning { color: var(--accent-amber-soft); }
.drill__clock.is-urgent { color: #fecaca; }
.drill__timer-btn {
  background: rgba(255,255,255,0.14);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  padding: var(--sp-1) var(--sp-3);
  cursor: pointer;
}
.drill__timer-btn:hover { background: rgba(255,255,255,0.24); }

/* ---- intro ---- */
.drill__intro {
  padding: var(--sp-4) var(--sp-5) 0;
  color: var(--ink-700);
  font-size: 0.95rem;
}

/* ---- layout: passage + questions ---- */
.drill__layout { padding: var(--sp-5); }
.drill--split .drill__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-5);
  align-items: start;
}
.drill__passage {
  background: var(--blue-50);
  border: 1px solid var(--blue-100);
  border-radius: var(--radius);
  padding: var(--sp-4) var(--sp-5);
  max-height: 60vh;
  overflow-y: auto;
  font-size: 0.95rem;
  line-height: 1.65;
}
.drill__passage h4 { margin-top: 0; color: var(--navy-900); }
.drill__passage p { margin: 0 0 var(--sp-3); }

/* ---- questions column: same-sized, independently scrollable window ---- */
.drill--split .drill__questions {
  max-height: 60vh;              /* matches .drill__passage exactly */
  overflow-y: auto;             /* scroll the questions on their own */
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding-right: var(--sp-2);   /* room beside the scrollbar */
  scrollbar-width: thin;
  scrollbar-color: var(--ink-300) transparent;
}
.drill--split .drill__questions::-webkit-scrollbar { width: 10px; }
.drill--split .drill__questions::-webkit-scrollbar-thumb {
  background: var(--ink-200);
  border-radius: var(--radius-sm);
}
.drill--split .drill__questions:hover::-webkit-scrollbar-thumb { background: var(--ink-300); }

/* ---- question groups ---- */
.drill__group { margin-bottom: var(--sp-5); }
.drill__group:last-child { margin-bottom: 0; }
.drill__group-head {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--navy-700);
  margin: 0 0 var(--sp-1);
}
.drill__group-instr {
  font-size: 0.9rem;
  color: var(--ink-500);
  font-style: italic;
  margin: 0 0 var(--sp-3);
}

.drill__q {
  display: flex;
  gap: var(--sp-3);
  padding: var(--sp-3);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  align-items: flex-start;
}
.drill__q + .drill__q { margin-top: var(--sp-1); }
.drill__qnum {
  flex: 0 0 auto;
  width: 1.9rem; height: 1.9rem;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--ink-100);
  border-radius: 50%;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--navy-700);
}
.drill__qbody { flex: 1 1 auto; min-width: 0; }
.drill__prompt { margin: 0 0 var(--sp-2); line-height: 1.5; }
.drill__q input[type="text"] {
  width: 100%;
  max-width: 22rem;
  padding: var(--sp-2) var(--sp-3);
  border: 1px solid var(--ink-300);
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 0.95rem;
}
.drill__q input[type="text"]:focus {
  outline: 2px solid var(--blue-500);
  outline-offset: 1px;
  border-color: var(--blue-500);
}
.drill__options { display: flex; flex-direction: column; gap: var(--sp-1); }
.drill__option { display: flex; gap: var(--sp-2); align-items: baseline; cursor: pointer; }

/* ---- marked states ---- */
.drill__q.is-correct { background: var(--accent-green-soft); border-color: var(--accent-green); }
.drill__q.is-incorrect { background: var(--accent-red-soft); border-color: var(--accent-red); }
.drill__q.is-correct .drill__qnum { background: var(--accent-green); color: #fff; }
.drill__q.is-incorrect .drill__qnum { background: var(--accent-red); color: #fff; }
.drill__verdict { font-size: 0.85rem; font-weight: 600; margin-top: var(--sp-1); }
.drill__q.is-correct .drill__verdict { color: var(--accent-green); }
.drill__q.is-incorrect .drill__verdict { color: var(--accent-red); }
.drill__correct { font-weight: 600; }

/* ---- actions ---- */
.drill__actions {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
  align-items: center;
  padding: var(--sp-4) var(--sp-5);
  border-top: 1px solid var(--ink-200);
  background: var(--canvas);
}
.drill__save-note { font-size: 0.8rem; color: var(--ink-500); margin-left: auto; }

/* ---- result summary ---- */
.drill__result {
  margin: 0 var(--sp-5) var(--sp-5);
  padding: var(--sp-4) var(--sp-5);
  border-radius: var(--radius);
  border: 1px solid var(--blue-100);
  background: var(--blue-50);
}
.drill__result[hidden] { display: none; }
.drill__score {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--navy-900);
  line-height: 1.1;
}
.drill__score small { font-size: 1rem; font-weight: 500; color: var(--ink-500); }
.drill__band { margin: var(--sp-2) 0 0; font-weight: 600; color: var(--navy-700); }
.drill__band-note { margin: var(--sp-1) 0 0; font-size: 0.9rem; color: var(--ink-700); }

/* ---- responsive ---- */
@media (max-width: 760px) {
  .drill--split .drill__layout { grid-template-columns: 1fr; }
  .drill__passage { max-height: 40vh; }
  .drill--split .drill__questions { max-height: 50vh; }
  .drill__clock { font-size: 1.2rem; }
}

@media (prefers-reduced-motion: reduce) {
  .drill * { transition: none !important; }
}