/* ═══════════════════════════════════════════
   MCQ DRILL — Quiz Page Styles  (quiz.css)
   ═══════════════════════════════════════════ */

/* ── upload screen ── */
#screen-upload {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  min-height: calc(100vh - 62px);
  padding: 2rem 1.5rem;
  gap: 1.5rem;
}

.upload-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700; letter-spacing: -0.03em;
  text-align: center;
}
.upload-hero h1 span { color: var(--accent); }
.upload-hero p {
  font-family: var(--mono); font-size: 0.8rem;
  color: var(--muted); text-align: center; margin-top: 0.4rem;
  text-transform: uppercase; letter-spacing: 0.08em;
}

.upload-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 18px; padding: 2rem;
  width: 100%; max-width: 540px;
  display: flex; flex-direction: column; gap: 1.25rem;
}

.drop-zone {
  border: 2px dashed var(--border); border-radius: 12px;
  padding: 2.5rem 1.5rem; text-align: center; cursor: pointer;
  transition: all 0.2s; position: relative;
}
.drop-zone input[type="file"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer;
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 4%, transparent);
}
.drop-icon { font-size: 2rem; margin-bottom: 0.75rem; }
.drop-zone h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.3rem; }
.drop-zone p  { font-size: 0.8rem; color: var(--muted); font-family: var(--mono); }

.format-box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 1rem 1.2rem;
}
.format-box h4 {
  font-family: var(--mono); font-size: 0.7rem; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 0.6rem;
}
.format-box pre {
  font-family: var(--mono); font-size: 0.75rem;
  color: var(--muted); line-height: 1.8; white-space: pre-wrap;
}
.format-box .hl { color: var(--accent); }

.or-line {
  display: flex; align-items: center; gap: 0.75rem;
  color: var(--muted); font-size: 0.8rem; font-family: var(--mono);
}
.or-line::before, .or-line::after {
  content:''; flex:1; height:1px; background: var(--border);
}

/* ── config screen ── */
#screen-config {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  min-height: calc(100vh - 62px);
  padding: 2rem 1.5rem; gap: 1.5rem;
}

.config-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 18px; padding: 2rem;
  width: 100%; max-width: 480px;
  display: flex; flex-direction: column; gap: 1.5rem;
}
.config-card h2 {
  font-size: 1.4rem; font-weight: 700; letter-spacing: -0.02em;
}
.config-card h2 span { color: var(--accent); }

.stat-boxes {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem;
}
.stat-box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 1rem; text-align: center;
}
.stat-box .sn {
  font-size: 2rem; font-weight: 700;
  font-family: var(--mono); color: var(--accent); line-height: 1;
}
.stat-box .sl {
  font-family: var(--mono); font-size: 0.7rem; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.07em; margin-top: 0.25rem;
}

.field { display: flex; flex-direction: column; gap: 0.6rem; }
.field label {
  font-family: var(--mono); font-size: 0.75rem; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.08em;
  display: flex; align-items: center; justify-content: space-between;
}
.field label .range-val {
  color: var(--text); font-size: 1rem; font-weight: 700;
}

input[type="range"] {
  -webkit-appearance: none; width: 100%;
  height: 4px; background: var(--border); border-radius: 4px; outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent); cursor: pointer;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}

.toggle-row {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 0.9rem 1.1rem;
  font-size: 0.9rem; font-weight: 500;
}

.toggle-btn {
  width: 42px; height: 24px; border-radius: 12px;
  background: var(--border); border: none;
  position: relative; transition: background 0.2s; flex-shrink: 0;
}
.toggle-btn::after {
  content: ''; position: absolute;
  width: 17px; height: 17px; border-radius: 50%;
  background: white; top: 3.5px; left: 3.5px;
  transition: left 0.2s; box-shadow: 0 1px 3px rgba(0,0,0,0.4);
}
.toggle-btn.tog-on { background: var(--accent); }
.toggle-btn.tog-on::after { left: 21.5px; }

/* ── quiz screen ── */
#screen-quiz {
  padding: 1.5rem 1.5rem 4rem;
  max-width: 820px; margin: 0 auto;
}

.quiz-topbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.25rem; flex-wrap: wrap; gap: 0.75rem;
}
.q-counter {
  font-family: var(--mono); font-size: 0.85rem; color: var(--muted);
}
.q-counter strong { color: var(--text); font-size: 1rem; }

.live-scores { display: flex; gap: 0.5rem; }

.q-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 1.75rem;
}
.q-eyebrow {
  font-family: var(--mono); font-size: 0.7rem; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.1em;
  margin-bottom: 0.9rem;
}
.q-text {
  font-size: 1.05rem; font-weight: 500; line-height: 1.7;
  margin-bottom: 1.5rem;
}

.options-list {
  display: flex; flex-direction: column; gap: 0.65rem;
}

.option-btn {
  display: flex; align-items: flex-start; gap: 0.9rem;
  padding: 0.9rem 1.1rem;
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: 10px; text-align: left;
  font-size: 0.92rem; color: var(--text);
  transition: border-color 0.15s, background 0.15s;
  width: 100%;
}
.option-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 5%, var(--surface));
}
.option-btn:disabled { cursor: default; }

.opt-label {
  font-family: var(--mono); font-size: 0.75rem; font-weight: 600;
  color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent);
  padding: 0.15rem 0.45rem; border-radius: 5px; flex-shrink: 0; margin-top: 0.1rem;
}

.option-btn.opt-correct {
  border-color: var(--green) !important;
  background: color-mix(in srgb, var(--green) 8%, var(--surface)) !important;
}
.option-btn.opt-correct .opt-label {
  color: var(--green); background: color-mix(in srgb, var(--green) 15%, transparent);
}
.option-btn.opt-wrong {
  border-color: var(--red) !important;
  background: color-mix(in srgb, var(--red) 8%, var(--surface)) !important;
}
.option-btn.opt-wrong .opt-label {
  color: var(--red); background: color-mix(in srgb, var(--red) 15%, transparent);
}

.feedback {
  display: flex; align-items: flex-start; gap: 0.75rem;
  margin-top: 1.1rem; padding: 0.9rem 1.1rem;
  border-radius: 10px; font-size: 0.9rem; line-height: 1.55;
  animation: fadeUp 0.25s ease;
}
.feedback.hidden { display: none; }
.fb-correct { background: color-mix(in srgb, var(--green) 8%, transparent); border: 1px solid color-mix(in srgb, var(--green) 25%, transparent); }
.fb-wrong   { background: color-mix(in srgb, var(--red)   8%, transparent); border: 1px solid color-mix(in srgb, var(--red)   25%, transparent); }
.fb-icon    { font-size: 1.1rem; flex-shrink: 0; }
.feedback em { font-style: normal; font-weight: 600; color: var(--green); }

.quiz-nav {
  display: flex; justify-content: flex-end;
  margin-top: 1.25rem;
}
#next-btn {
  background: var(--accent); color: #000;
  border: none; padding: 0.8rem 1.75rem;
  border-radius: 9px; font-size: 0.92rem; font-weight: 700;
  transition: filter 0.2s, transform 0.15s;
}
#next-btn:hover { filter: brightness(1.1); transform: translateX(2px); }

/* ── results screen ── */
#screen-results {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  min-height: calc(100vh - 62px);
  padding: 2rem 1.5rem; gap: 1.5rem;
}

.results-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 20px; padding: 2.5rem 2rem;
  width: 100%; max-width: 480px;
  display: flex; flex-direction: column;
  align-items: center; gap: 1.75rem; text-align: center;
}

.score-ring-wrap { position: relative; width: 130px; height: 130px; }
.score-ring-wrap svg { transform: rotate(-90deg); }
.score-ring-bg  { fill: none; stroke: var(--border); stroke-width: 8; }
.score-ring-fg  {
  fill: none; stroke: var(--accent); stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s ease;
}
.score-ring-text {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
}
.score-ring-text .pct {
  font-size: 1.8rem; font-weight: 700;
  font-family: var(--mono); line-height: 1;
}
.score-ring-text .lbl {
  font-family: var(--mono); font-size: 0.65rem;
  color: var(--muted); text-transform: uppercase;
  letter-spacing: 0.08em; margin-top: 0.2rem;
}

#res-grade { font-size: 1.3rem; font-weight: 700; }

.res-stats {
  display: grid; grid-template-columns: repeat(3,1fr); gap: 0.75rem; width: 100%;
}
.rs-box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 0.9rem 0.5rem; text-align: center;
}
.rs-box .rn { font-size: 1.6rem; font-weight: 700; font-family: var(--mono); line-height: 1; }
.rs-box .rl { font-family: var(--mono); font-size: 0.65rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.07em; margin-top: 0.25rem; }
.rn-g { color: var(--green); }
.rn-r { color: var(--red); }
.rn-y { color: var(--yellow); }

.results-actions { display: flex; flex-direction: column; gap: 0.65rem; width: 100%; }

/* ── review screen ── */
#screen-review { padding: 2rem 1.5rem 4rem; max-width: 820px; margin: 0 auto; }

.review-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.75rem;
}
.review-header h2 { font-size: 1.4rem; font-weight: 700; }

.review-list { display: flex; flex-direction: column; gap: 1.25rem; }

.review-item {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.4rem;
  border-left: 4px solid var(--border);
}
.review-item.ri-correct { border-left-color: var(--green); }
.review-item.ri-wrong   { border-left-color: var(--red); }
.review-item.ri-skip    { border-left-color: var(--yellow); }

.ri-header {
  display: flex; align-items: center; gap: 0.6rem; margin-bottom: 0.6rem;
}
.ri-num {
  font-family: var(--mono); font-size: 0.72rem; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.08em;
}
.ri-badge {
  font-family: var(--mono); font-size: 0.72rem;
  padding: 0.15rem 0.55rem; border-radius: 5px;
  background: var(--surface); color: var(--muted);
}
.ri-correct .ri-badge { color: var(--green); }
.ri-wrong   .ri-badge { color: var(--red); }
.ri-skip    .ri-badge { color: var(--yellow); }

.ri-q { font-size: 0.95rem; font-weight: 500; margin-bottom: 0.9rem; line-height: 1.6; }

.ri-opts { display: flex; flex-direction: column; gap: 0.35rem; }
.review-opt {
  font-family: var(--mono); font-size: 0.82rem;
  padding: 0.4rem 0.75rem; border-radius: 7px; color: var(--muted);
}
.review-opt.ro-correct { background: color-mix(in srgb, var(--green) 10%, transparent); color: var(--green); }
.review-opt.ro-wrong   { background: color-mix(in srgb, var(--red) 10%, transparent);   color: var(--red); }

/* ── toast ── */
.toast {
  position: fixed; bottom: 1.5rem; left: 50%; transform: translateX(-50%) translateY(10px);
  background: var(--card); border: 1px solid var(--border);
  padding: 0.75rem 1.5rem; border-radius: 10px;
  font-family: var(--mono); font-size: 0.82rem;
  opacity: 0; transition: all 0.3s; pointer-events: none; z-index: 1000;
  white-space: nowrap;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.toast-success { border-color: rgba(74,222,128,0.4); color: var(--green); }
.toast.toast-error   { border-color: rgba(248,113,113,0.4); color: var(--red); }

/* ── responsive ── */
@media (max-width: 500px) {
  .upload-card, .config-card, .results-card { padding: 1.4rem; }
  .q-card { padding: 1.25rem; }
  .q-text { font-size: 0.97rem; }
}