.useful-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 54px;
  max-width: 1100px;
  margin: 0 auto;
}

.useful-article {
  font-family: var(--serif);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.55;
}

.useful-kicker {
  margin-top: 34px;
}

.useful-article h1 {
  margin: 12px 0 30px;
  font-family: var(--sans);
  font-size: clamp(40px, 6vw, 78px);
  font-weight: 750;
  letter-spacing: -.06em;
  line-height: .95;
}

.useful-intro {
  margin: 0 0 42px;
}

.useful-document {
  scroll-margin-top: 30px;
}

.useful-document h2 {
  margin: 42px 0 12px;
  font-family: var(--sans);
  font-size: 20px;
}

.useful-document h3 {
  margin: 28px 0 10px;
  font-family: var(--sans);
  font-size: 17px;
}

.useful-document p,
.useful-document li {
  font: inherit;
}

.useful-document a {
  color: var(--accent-dark);
  text-decoration-color: rgba(190, 55, 35, .3);
  text-underline-offset: 3px;
}

.useful-aside {
  position: sticky;
  top: 28px;
  align-self: start;
}

.useful-link {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 0;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
  text-align: left;
  text-decoration: none;
}

.useful-link .icon {
  width: 14px;
  height: 14px;
  margin-left: auto;
}

.useful-edit-button {
  width: 100%;
  margin-top: 18px;
}

.useful-meta {
  display: block;
  margin-top: 12px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.5;
}

.useful-lock {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.useful-empty,
.useful-loading {
  display: grid;
  min-height: 220px;
  place-items: start;
  align-content: center;
  gap: 10px;
  color: var(--muted);
}

.useful-empty h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 20px;
}

.useful-empty p {
  margin: 0;
}

.useful-loading {
  grid-template-columns: auto 1fr;
  align-items: center;
}

.useful-loading span {
  width: 20px;
  height: 20px;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: useful-spin .7s linear infinite;
}

@keyframes useful-spin {
  to { transform: rotate(360deg); }
}

.useful-notice {
  margin-top: 40px;
}

.useful-editor {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-12);
}

.wys-bar {
  position: relative;
  display: flex;
  gap: 4px;
  padding: 8px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.useful-link-popover {
  position: absolute;
  z-index: 4;
  inset-block-start: calc(100% + 8px);
  inset-inline-start: 0;
  width: min(360px, calc(100vw - 48px));
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-12);
  background: var(--surface);
}

.useful-link-popover[hidden] {
  display: none;
}

.useful-link-popover label,
.useful-link-popover label span {
  display: block;
}

.useful-link-popover label span {
  margin-block-end: 6px;
  color: var(--muted);
  font-size: 12px;
}

.useful-link-popover input {
  width: 100%;
}

.useful-link-popover > div {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-block-start: 10px;
}

.useful-wys {
  min-height: 360px;
  padding: 24px;
  outline: 0;
  font-size: 16px;
  line-height: 1.75;
}

.useful-wys:focus {
  box-shadow: inset 0 0 0 2px rgba(232, 79, 53, .2);
}

.useful-edit-error {
  padding: 0 24px;
  color: var(--danger-ink);
  font-size: 12px;
}

.useful-edit-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 14px;
  border-top: 1px solid var(--line);
}

@media (max-width: 920px) {
  .useful-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .useful-aside {
    position: static;
  }
}

@media (max-width: 720px) {
  .useful-article h1 {
    font-size: clamp(42px, 13vw, 66px);
  }
}