.app-shell {
  display: grid;
  grid-template-columns: minmax(300px, 380px) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--line);
  height: 100vh;
  overflow: auto;
  padding: 18px;
  position: sticky;
  top: 0;
}

.brand {
  align-items: center;
  display: flex;
  gap: 12px;
  margin-bottom: 18px;
}

.brand-mark {
  background: linear-gradient(135deg, var(--green), var(--blue));
  display: block;
  height: 32px;
  width: 32px;
}

.brand small {
  color: var(--muted);
  display: block;
  font-size: 12px;
  margin-top: 2px;
}

.search-box {
  align-items: center;
  background: white;
  border: 1px solid var(--line);
  display: flex;
  gap: 9px;
  padding: 9px 11px;
}

.search-box svg {
  color: var(--muted);
  height: 17px;
  width: 17px;
}

.search-box input {
  border: 0;
  min-width: 0;
  outline: 0;
  width: 100%;
}

.filter-row {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr 1fr;
  margin: 10px 0 14px;
}

.filter-row select {
  background: white;
  border: 1px solid var(--line);
  min-width: 0;
  padding: 9px;
}

.article-list {
  display: grid;
  gap: 8px;
}

.article-item {
  background: white;
  border: 1px solid var(--line);
  padding: 12px;
  text-align: left;
  width: 100%;
}

.article-item.active,
.article-item:hover {
  border-color: var(--green);
}

.article-item strong {
  display: block;
  font-size: 14px;
  line-height: 1.3;
}

.article-item span {
  color: var(--muted);
  display: block;
  font-size: 12px;
  margin-top: 6px;
}

.workspace {
  padding: 28px clamp(22px, 4vw, 54px) 44px;
}

.topbar {
  align-items: start;
  display: flex;
  gap: 20px;
  justify-content: space-between;
  margin-bottom: 18px;
}

.topbar h1 {
  font-family: Georgia, serif;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.04;
  margin: 0;
  max-width: 900px;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.summary-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0 0 18px;
}

.metric {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 14px;
}

.metric strong {
  display: block;
  font-size: 24px;
}

.metric span {
  color: var(--muted);
  font-size: 12px;
}

.content-grid {
  align-items: start;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr) minmax(270px, 340px);
}

@media (max-width: 980px) {
  .app-shell,
  .content-grid,
  .summary-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    height: auto;
    position: relative;
  }

  .topbar {
    display: block;
  }

  .action-row {
    justify-content: flex-start;
    margin-top: 16px;
  }
}