/* 랜딩 — 문제 맛보기 (landing-vocab 톤 맞춤) */

.landing-problem-section {
  background: #ffffff;
  border: 1px solid #ddeaf8;
  border-radius: 20px;
  padding: 24px 18px;
  margin-bottom: 28px;
  box-shadow: 0 4px 20px rgba(74, 144, 226, 0.08);
}

.landing-problem-section-title {
  font-family: 'Noto Serif KR', serif;
  font-size: 18px;
  color: var(--navy);
  text-align: center;
  margin-bottom: 6px;
}

.landing-problem-desc {
  text-align: center;
  font-size: 12px;
  color: var(--gray);
  margin-bottom: 18px;
}

.landing-problem-tabs {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.landing-problem-tab {
  padding: 8px 14px;
  border-radius: 20px;
  border: 1px solid #ddeaf8;
  background: #f5f9ff;
  color: var(--gray);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.landing-problem-tab:hover {
  border-color: var(--blue);
  color: var(--navy);
}

.landing-problem-tab.is-active {
  background: rgba(37, 99, 235, 0.12);
  border-color: rgba(37, 99, 235, 0.35);
  color: var(--navy);
  font-weight: 600;
}

.landing-problem-panel {
  min-height: 80px;
}

.landing-problem-empty,
.landing-problem-loading {
  text-align: center;
  font-size: 13px;
  color: var(--gray);
  padding: 28px 12px;
}

.landing-problem-card {
  background: #f5f9ff;
  border: 1px solid #ddeaf8;
  border-radius: 12px;
  padding: 14px 12px;
  margin-bottom: 12px;
}

.landing-problem-type {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 8px;
  margin-bottom: 8px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--blue);
}

.landing-problem-passage {
  font-size: 14px;
  line-height: 1.65;
  color: var(--navy);
  margin-bottom: 10px;
  word-break: keep-all;
}

.landing-problem-passage u {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.landing-problem-passage strong {
  font-weight: 700;
}

.landing-problem-q {
  font-size: 13px;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 8px;
}

.lp-choices {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 4px;
}

.lp-choice {
  display: block;
  width: 100%;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  line-height: 1.5;
  color: #334155;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid #ddeaf8;
  background: #fff;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.lp-choice:hover:not(:disabled) {
  border-color: var(--blue);
  color: var(--navy);
}

.lp-choice.is-selected {
  background: rgba(26, 58, 107, 0.08);
  border-color: #1a3a6b;
  color: #1a3a6b;
  font-weight: 600;
}

.lp-choice:disabled {
  cursor: default;
  opacity: 0.95;
}

.lp-explain-btn {
  margin-top: 10px;
  padding: 6px 12px;
  border-radius: 16px;
  border: 1px solid #ddeaf8;
  background: #fff;
  color: var(--navy);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
}

.lp-explain-btn:hover:not(:disabled):not(.is-inactive) {
  border-color: var(--blue);
  background: #f5f9ff;
}

.lp-explain-btn.is-inactive,
.lp-explain-btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

.lp-hint {
  min-height: 1.2em;
  margin-top: 6px;
  font-size: 12px;
  color: var(--gray);
}

.lp-explain-box {
  margin-top: 10px;
  padding: 10px;
  border-radius: 10px;
  background: #fff;
  border: 1px solid #e8eef6;
  font-size: 12px;
  line-height: 1.55;
  color: #475569;
}

.lp-verdict {
  font-weight: 600;
  margin-bottom: 8px;
}

.lp-verdict.ok {
  color: #1a6b3c;
}

.lp-verdict.no {
  color: #8b4a4a;
}

.lp-explain-text {
  white-space: pre-wrap;
  word-break: keep-all;
}

.landing-problem-foot {
  text-align: center;
  font-size: 12px;
  color: #64748b;
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px dashed #ddeaf8;
}