.topic-detail-page {
  max-width: 1320px;
  margin: 0 auto;
  padding: 1.2rem 1rem 2rem;
}

.topic-layout {
  display: grid;
  grid-template-columns: minmax(0, 2.4fr) minmax(320px, 1fr);
  gap: 1.2rem;
}

.topic-article,
.topic-sidecard,
.topic-comments {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.topic-article {
  padding: 1rem;
}

.topic-note {
  margin-bottom: 1rem;
  padding: 0.75rem 0.9rem;
  background: #fffbeb;
  border: 1px solid #f7e4a0;
  border-radius: 10px;
  color: #7c5d1a;
}

.topic-article__header h1 {
  margin: 0;
  font-size: clamp(1.2rem, 2.2vw, 1.8rem);
  line-height: 1.3;
}

.topic-article__content {
  margin-top: 1rem;
  line-height: 1.75;
}

.topic-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.topic-sidecard {
  padding: 1rem;
}

.topic-sidecard h2 {
  margin: 0 0 0.7rem;
  font-size: 1.1rem;
}

.topic-sidecard p,
.topic-sidecard ul {
  margin: 0;
}

.topic-sidecard ul {
  padding-left: 1rem;
}

.topic-sidecard li {
  margin-bottom: 0.35rem;
}

.topic-comments {
  margin-top: 1rem;
  padding: 1rem;
}

.topic-comments__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.topic-comments h2 {
  margin: 0;
}

.topic-comment-form {
  display: grid;
  gap: 0.5rem;
}

.topic-comment-form label {
  font-weight: 700;
  font-size: 0.92rem;
}

.topic-comment-form input,
.topic-comment-form textarea {
  width: 100%;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  padding: 0.55rem 0.65rem;
  font: inherit;
  background: #fff;
}

.topic-comment-form textarea {
  resize: vertical;
}

.topic-comment-dialog {
  width: min(640px, calc(100vw - 2rem));
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 0;
}

.topic-comment-dialog::backdrop {
  background: rgba(15, 23, 42, 0.45);
}

.topic-comment-dialog__topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  margin: 0;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--color-line);
}

.topic-comment-dialog__topbar h3 {
  margin: 0;
  font-size: 1.06rem;
}

.topic-comment-dialog .topic-comment-form {
  padding: 1rem;
}

.comment-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.comment-item {
  border: 1px solid var(--color-line);
  border-radius: 10px;
  padding: 0.85rem;
  display: grid;
  grid-template-columns: minmax(180px, 220px) minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
}

.comment-item__info {
  display: grid;
  gap: 0.25rem;
}

.comment-item__info time {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.comment-item__content {
  margin: 0;
  line-height: 1.6;
}

@media (max-width: 900px) {
  .topic-layout {
    grid-template-columns: 1fr;
  }

  .topic-sidecard {
    order: 0;
  }

  .comment-item {
    grid-template-columns: 1fr;
    gap: 0.55rem;
  }
}