* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Inter", "Noto Sans SC", system-ui, sans-serif;
  background: #f5f7fb;
  color: #111827;
}
a { color: inherit; }
.catalog-shell, .exercise-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 32px 0 48px;
}
.back-link {
  display: inline-flex;
  margin-bottom: 28px;
  color: #2563eb;
  text-decoration: none;
  font-weight: 800;
}
.catalog-header {
  text-align: center;
  margin-bottom: 28px;
}
.catalog-header p, .eyebrow {
  margin: 0 0 8px;
  color: #64748b;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}
h1, h2, h3 { margin: 0; }
.catalog-header h1 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.12;
}
.summary-chips {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.summary-chips span, .card-meta span {
  border-radius: 999px;
  background: #eef2ff;
  color: #3730a3;
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 800;
}
.day-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 0 0 24px;
}
.day-filter button {
  border: 0;
  border-radius: 999px;
  padding: 11px 18px;
  background: #e5e7eb;
  color: #475569;
  cursor: pointer;
  font: inherit;
  font-weight: 900;
}
.day-filter button.active {
  background: #2563eb;
  color: #fff;
}
.exercise-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.exercise-card {
  display: block;
  min-height: 190px;
  padding: 22px;
  border-radius: 14px;
  border: 1px solid #e5e7eb;
  background: #fff;
  text-decoration: none;
  box-shadow: 0 12px 24px rgba(15, 23, 42, .06);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.exercise-card:hover {
  transform: translateY(-3px);
  border-color: #bfdbfe;
  box-shadow: 0 18px 34px rgba(37, 99, 235, .12);
}
.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.card-badge {
  border-radius: 999px;
  background: linear-gradient(135deg, #2563eb, #0f766e);
  color: #fff;
  padding: 7px 11px;
  font-size: 13px;
  font-weight: 900;
}
.card-count {
  color: #64748b;
  font-size: 13px;
  font-weight: 800;
}
.exercise-card h2 {
  min-height: 60px;
  font-size: 20px;
  line-height: 1.3;
}
.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.exercise-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
  color: #64748b;
  font-weight: 800;
}
.exercise-topline .back-link { margin: 0; }
.practice-head, .audio-card, .question-card, .result-panel {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  box-shadow: 0 12px 24px rgba(15, 23, 42, .06);
}
.practice-head {
  padding: 24px;
  margin-bottom: 18px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
}
.practice-head h1 { font-size: clamp(24px, 3vw, 34px); }
.score-chip {
  align-self: flex-start;
  border-radius: 999px;
  background: #eef2ff;
  color: #3730a3;
  padding: 12px 16px;
  font-weight: 900;
  white-space: nowrap;
}
.audio-card { padding: 18px; margin-bottom: 18px; }
audio { width: 100%; }
.question-card { padding: 30px 34px; }
.question-content { font-size: 18px; line-height: 1.9; }
.question-content p { margin: 0 0 14px; }
.table-wrap { overflow-x: auto; margin: 16px 0; }
table { width: 100%; min-width: 520px; border-collapse: collapse; }
td { border: 1px solid #dbe3ef; padding: 10px 12px; vertical-align: top; }
.answer-blank {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  vertical-align: middle;
  margin: 0 4px;
}
.answer-blank__num, .extra-answer span {
  min-width: 28px;
  height: 28px;
  border-radius: 999px;
  background: #e0f2fe;
  color: #0369a1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 900;
}
input[data-answer-input] {
  width: 150px;
  border: 1px solid #cbd5e1;
  border-radius: 9px;
  padding: 8px 10px;
  font-size: 15px;
}
input[data-answer-input]:focus { outline: 3px solid rgba(37, 99, 235, .14); border-color: #2563eb; }
input.correct { border-color: #16a34a; background: #f0fdf4; }
input.incorrect { border-color: #dc2626; background: #fef2f2; }
.extra-answers {
  margin-top: 20px;
  padding: 16px;
  border-radius: 14px;
  background: #f8fafc;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.extra-answer { display: flex; align-items: center; gap: 8px; }
.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 20px 0;
}
button.primary, button.secondary {
  border: 0;
  border-radius: 12px;
  padding: 12px 18px;
  cursor: pointer;
  font: inherit;
  font-weight: 900;
}
button.primary { background: #2563eb; color: #fff; }
button.secondary { background: #e5e7eb; color: #1f2937; }
.result-panel { padding: 22px; }
.answer-review {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.answer-row { padding: 10px 12px; border-radius: 12px; background: #f8fafc; }
.answer-row.ok { color: #166534; }
.answer-row.bad { color: #991b1b; }
@media (max-width: 900px) {
  .exercise-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .catalog-shell, .exercise-shell { width: min(100% - 28px, 1180px); padding-top: 22px; }
  .exercise-grid, .answer-review, .extra-answers { grid-template-columns: 1fr; }
  .practice-head { flex-direction: column; }
  .question-card { padding: 20px; }
  .question-content { font-size: 16px; }
  input[data-answer-input] { width: min(150px, 52vw); }
}