.grammar-list {
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}
.grammar-card {
  position: relative;
  padding: 1.4rem 1.6rem 1.4rem 5.8rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.grammar-card .point-num {
  position: absolute;
  left: 1.1rem;
  top: 1rem;
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  opacity: 0.8;
}
.grammar-card .point-name {
  font-size: 1.1rem;
  font-weight: 700;
  font-family: var(--font-display);
  color: var(--ink);
  margin-bottom: 0.8rem;
}

@media (max-width: 600px) {
  .grammar-card {
    padding: 4.4rem 1rem 1.25rem;
  }
  .grammar-card .point-num {
    left: 1rem;
    top: 0.8rem;
    font-size: 2.35rem;
  }
  .grammar-card .point-name {
    line-height: 1.45;
    margin-bottom: 0.9rem;
  }
  .grammar-card .heading-en {
    display: block;
    margin-top: 0.15rem;
    font-size: 0.9em;
  }
  .grammar-card .formula {
    display: block;
    width: 100%;
    overflow-wrap: anywhere;
  }
}
.grammar-card .formula {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  background: var(--paper-2);
  color: var(--ink);
  padding: 0.5rem 0.85rem;
  border-radius: 3px;
  margin-bottom: 0.8rem;
  display: inline-block;
  border-left: 3px solid var(--accent);
}
.grammar-card .example {
  font-size: 0.92rem;
  color: var(--text);
  padding: 0.5rem 0;
  line-height: 1.7;
  font-family: var(--font-jp);
}
.grammar-card .example-context {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
  font-family: var(--font-sans);
}
.grammar-card .explanation {
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-light);
  padding-top: 0.65rem;
  margin-top: 0.65rem;
  font-family: var(--font-sans);
}
.grammar-fill {
  margin-top: 0.85rem;
}
.grammar-fill .fill-translation {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  font-family: var(--font-sans);
  font-style: italic;
}
.grammar-fill .fill-translation::before {
  content: "→ ";
}
.fill-sentence {
  font-family: var(--font-jp);
  font-size: 0.95rem;
  color: var(--ink);
  line-height: 2.2;
  padding: 0.25rem 0;
}
.fill-result-row {
  margin-top: 0;
}
.grammar-fill .fill-result {
  font-size: 0.85rem;
  padding: 0.3rem 0.6rem;
  border-radius: 3px;
  font-family: var(--font-sans);
}

/* Fill section controls */
.fill-result-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.ex-fill-controls {
  margin-top: 0;
}
.g-blank-clear,
.ex-fill-clear {
  font-size: 0.72rem;
}

/* Card fill deck — 名刺 style */
.card-fill-deck {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  padding: 0.8rem;
  background: var(--paper-2);
  border-radius: 4px;
}
.card-fill-card {
  flex: 1;
  min-width: 120px;
  padding: 0.75rem 0.9rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  box-shadow: var(--shadow-sm);
}
.cfc-name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}
.cfc-info {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--text-muted);
}
.cfc-label {
  font-family: var(--font-jp);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  margin-top: 0.15rem;
  padding-top: 0.25rem;
  border-top: 1px dashed var(--accent-border);
}

/* Select exercise pills */
.option-btn {
  padding: 0.35rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: 20px;
  background: transparent;
  font-family: var(--font-jp);
  font-size: 0.9rem;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.12s ease;
}
.option-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.option-btn.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.option-btn.correct {
  border-color: var(--success);
  background: var(--success-light);
  color: var(--success);
}
.option-btn.wrong {
  border-color: var(--error);
  background: var(--error-light);
  color: var(--error);
  text-decoration: line-through;
}

.grammar-fill .fill-result.correct {
  color: var(--success);
  background: var(--success-light);
}
.grammar-fill .fill-result.wrong {
  color: var(--error);
  background: var(--error-light);
}

/* Unified inline blank — workbook fill-in style */
.inline-blank {
  border: none;
  border-bottom: 2px dashed var(--border);
  background: transparent;
  font-family: var(--font-jp);
  font-size: inherit;
  color: var(--ink);
  text-align: center;
  padding: 0 0.15rem;
  min-width: 3.5ch;
  width: auto;
  max-width: 14ch;
  outline: none;
  transition:
    border-color 0.15s,
    background 0.15s;
  line-height: 1.6;
  vertical-align: baseline;
}
.inline-blank:focus {
  border-bottom-color: var(--accent);
  border-bottom-style: solid;
  background: var(--accent-soft);
}
.inline-blank.correct {
  border-bottom-color: var(--success);
  border-bottom-style: solid;
  background: var(--success-light);
}
.inline-blank.wrong {
  border-bottom-color: var(--error);
  border-bottom-style: solid;
  background: var(--error-light);
}