.article-header {
  position: sticky;
}

.article-main,
.article-list-main {
  padding: 74px 0 72px;
  background: var(--soft);
}

.reading-main {
  padding-top: 0;
  background:
    linear-gradient(#f7f7f8 0 360px, var(--soft) 360px);
}

.article-shell {
  width: min(880px, calc(100% - 34px));
  margin: 0 auto;
}

.reading-shell {
  width: min(980px, calc(100% - 36px));
  padding-top: clamp(44px, 7vw, 86px);
}

.article-back {
  display: inline-flex;
  margin-bottom: 24px;
  color: var(--purple);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-weight: 800;
  text-decoration: none;
}

.article-theme {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 16px;
  padding: 6px 12px;
  color: var(--purple);
  background: var(--purple-soft);
  border-radius: 6px;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 13px;
  font-weight: 800;
}

.article-shell h1 {
  margin-bottom: 18px;
  color: var(--ink);
  font-size: clamp(38px, 5.2vw, 68px);
  line-height: 1.14;
}

.reading-shell h1 {
  max-width: 900px;
  margin-bottom: 20px;
  font-size: clamp(44px, 6vw, 78px);
  line-height: 1.12;
}

.article-subtitle {
  margin-bottom: 30px;
  color: var(--muted);
  font-size: clamp(19px, 2vw, 25px);
  line-height: 1.75;
}

.reading-shell .article-subtitle {
  max-width: 820px;
  margin-bottom: 36px;
  color: #4b5563;
  font-size: clamp(20px, 2.2vw, 27px);
  line-height: 1.72;
}

.article-cover {
  width: 100%;
  margin-bottom: 30px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.reading-shell .article-cover {
  margin-bottom: 36px;
  box-shadow: 0 16px 42px rgba(17, 24, 39, 0.08);
}

.answer-card,
.article-section-block,
.faq-block {
  margin-bottom: 24px;
  padding: 28px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.reading-answer,
.reading-block,
.reading-faq {
  width: min(820px, 100%);
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 22px;
  box-shadow: none;
}

.reading-block {
  padding: 36px 42px;
  border-color: #ececee;
}

.reading-answer {
  padding: 30px 36px;
}

.answer-card {
  border-left: 4px solid var(--purple);
}

.answer-card span {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--purple);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 13px;
  font-weight: 900;
}

.answer-card h2,
.article-section-block h2,
.faq-block h2 {
  margin-bottom: 16px;
  color: var(--ink);
  font-size: clamp(25px, 2.6vw, 36px);
  line-height: 1.28;
}

.reading-block h2,
.reading-faq h2 {
  margin-bottom: 20px;
  font-size: clamp(28px, 3vw, 40px);
}

.answer-card h3 {
  margin: 20px 0 8px;
  color: var(--ink);
  font-size: 19px;
}

.answer-card p,
.answer-card li,
.article-section-block p,
.faq-block p {
  color: var(--muted);
  font-size: 18px;
  line-height: 2;
}

.reading-block p,
.reading-answer p,
.reading-faq p {
  color: #4b5563;
  font-size: 19px;
  line-height: 2.08;
}

.reading-block p + p {
  margin-top: 18px;
}

.answer-card ul {
  margin: 0;
  padding-left: 22px;
}

.article-section-block p:last-child,
.answer-card p:last-child {
  margin-bottom: 0;
}

.faq-block details {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.faq-block summary {
  color: var(--ink);
  cursor: pointer;
  font-size: 19px;
  font-weight: 800;
}

.faq-block details p {
  margin: 12px 0 0;
}

@media (max-width: 640px) {
  .article-shell h1 {
    font-size: 36px;
  }

  .answer-card,
  .article-section-block,
  .faq-block {
    padding: 22px;
  }

  .reading-shell {
    width: min(100% - 28px, 980px);
    padding-top: 36px;
  }

  .reading-shell h1 {
    font-size: 38px;
  }

  .reading-block p,
  .reading-answer p,
  .reading-faq p {
    font-size: 17px;
    line-height: 1.95;
  }
}