.back-to-top {
  position: fixed;
  right: 18px;
  bottom: 22px;
  z-index: 240;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 1.15rem;
  font-weight: 700;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--red);
}

.article-author {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 16px;
  align-items: center;
  margin: 36px 0 28px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--fog);
}

.article-author__avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  background: #ddd;
}

.article-author strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 4px;
}

.article-author p {
  margin: 0 !important;
  font-size: 0.92rem !important;
  line-height: 1.45 !important;
  font-family: var(--font) !important;
  color: var(--muted) !important;
}

.related-reads {
  margin: 36px 0 28px;
  padding: 22px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid var(--line);
}

.related-reads h3 {
  margin: 0 0 14px !important;
  font-size: 1.05rem !important;
}

.related-reads ul {
  list-style: none;
  margin: 0 !important;
  padding: 0 !important;
  display: grid;
  gap: 10px;
}

.related-reads a {
  display: block;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--fog);
}

.related-reads a:hover {
  color: var(--red);
}

.related-reads .related-kicker {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 2px;
}

.tldr {
  margin: 0 0 22px;
  padding: 16px 18px;
  border-radius: 14px;
  background: #f3f8ff;
  border: 1px solid #d7e6f8;
}

.tldr strong {
  display: block;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.tldr ol {
  margin: 0;
  padding-left: 1.2rem;
}

.tldr li {
  margin-top: 4px;
  font-family: var(--font-read);
  line-height: 1.5;
}

.article-cta {
  margin: 28px 0;
  padding: 22px;
  border-radius: 16px;
  background: var(--ink);
  color: #fff;
}

.article-cta p {
  margin: 0 0 14px !important;
  color: rgba(255, 255, 255, 0.85) !important;
  font-family: var(--font) !important;
}

.article-cta .btn {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
}

.callout.tip {
  background: #eef5ff;
  border-color: #c5daf5;
}

.callout.example {
  background: #f7f4ff;
  border-color: #d8cff5;
}

.callout.danger {
  background: #fff1f0;
  border-color: #ffb3ab;
}

.term-tip {
  border-bottom: 1px dotted var(--red);
  cursor: help;
  position: relative;
  font-style: normal;
  font-weight: 600;
}

.term-tip::after {
  content: attr(data-tip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%);
  width: min(260px, 70vw);
  padding: 8px 10px;
  border-radius: 8px;
  background: #1a1a1a;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.35;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
  z-index: 20;
}

.term-tip:hover::after,
.term-tip:focus::after {
  opacity: 1;
}

.glossary {
  margin: 28px 0;
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--fog);
}

.glossary h3 {
  margin: 0 0 12px !important;
  font-size: 1.05rem !important;
}

.glossary dl {
  margin: 0;
  display: grid;
  gap: 12px;
}

.glossary dt {
  font-weight: 800;
  color: var(--ink);
  font-size: 0.95rem;
}

.glossary dd {
  margin: 4px 0 0;
  color: var(--ink-soft);
  font-family: var(--font-read);
  font-size: 0.98rem;
  line-height: 1.5;
}

.article-poll,
.article-rating {
  margin: 28px 0;
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #fff;
}

.article-poll h3,
.article-rating h3 {
  margin: 0 0 12px !important;
  font-size: 1.02rem !important;
}

.article-poll__options,
.article-rating__options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.article-poll button,
.article-rating button {
  border: 1px solid var(--line);
  background: var(--fog);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  color: var(--ink-soft);
}

.article-poll button:hover,
.article-rating button:hover,
.article-poll button.is-selected,
.article-rating button.is-selected {
  border-color: var(--red);
  color: var(--red);
  background: #fff5f5;
}

.article-poll__result,
.article-rating__thanks {
  margin: 12px 0 0;
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 600;
}

.article-poll.is-done button,
.article-rating.is-done button {
  pointer-events: none;
  opacity: 0.7;
}

.article-poll.is-done button.is-selected,
.article-rating.is-done button.is-selected {
  opacity: 1;
}

.article-rating--compact {
  margin: 0 0 22px;
  padding: 12px 14px;
}

.article-rating--compact h3 {
  font-size: 0.92rem !important;
  margin-bottom: 8px !important;
}

.article-calc {
  margin: 28px 0;
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #f7fbff;
}

.article-calc h3 {
  margin: 0 0 8px !important;
  font-size: 1.05rem !important;
}

.article-calc__hint {
  margin: 0 0 14px !important;
  color: var(--muted) !important;
  font-size: 0.92rem !important;
  font-family: var(--font) !important;
}

.article-calc__fields {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 12px;
  align-items: end;
}

.article-calc label {
  display: grid;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--ink-soft);
}

.article-calc input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
}

.article-calc__out {
  margin: 14px 0 0 !important;
  font-weight: 700 !important;
  font-family: var(--font) !important;
}

.article-calc__out.is-ok {
  color: #1f7a4d;
}

.article-calc__out.is-warn {
  color: #b45309;
}

.article-calc__out.is-bad {
  color: var(--red);
}

.article-sources,
.article-tags,
.article-prompt {
  margin: 28px 0;
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--fog);
}

.article-sources h3,
.article-tags h3,
.article-prompt h3 {
  margin: 0 0 10px !important;
  font-size: 1.02rem !important;
}

.article-sources ul,
.article-tags ul {
  margin: 0 !important;
  padding-left: 1.1rem !important;
}

.article-sources li,
.article-prompt p {
  font-family: var(--font-read);
  line-height: 1.5;
  color: var(--ink-soft);
}

.article-tags ul {
  list-style: none;
  padding: 0 !important;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.article-tags li a,
.article-tags li span {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--ink-soft);
  text-decoration: none;
}

.article-tags li a:hover {
  color: var(--red);
  border-color: var(--red);
}

@media (max-width: 720px) {
  .article-calc__fields {
    grid-template-columns: 1fr;
  }

  .article-author {
    grid-template-columns: 52px 1fr;
  }

  .back-to-top {
    right: 14px;
    bottom: 16px;
  }

  .term-tip::after {
    left: 0;
    transform: none;
  }
}