.activity-form-page {
  max-width: 1120px;
  padding-top: 42px;
  padding-bottom: 96px;
}

.activity-form-intro {
  margin-bottom: 30px;
}

.activity-back {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 24px;
  color: var(--color-secondary);
  font-size: var(--font-size-small);
  font-weight: 620;
  text-decoration: none;
}

.activity-back .icon {
  width: 17px;
  height: 17px;
}

.activity-back:hover {
  color: var(--color-ink);
}

.activity-intro-copy {
  max-width: 680px;
}

.activity-intro-copy p {
  margin-top: 9px;
  color: var(--color-secondary);
  font-size: var(--font-size-body);
  line-height: 1.65;
}

.activity-compose-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  align-items: start;
  gap: 24px;
}

.activity-form {
  overflow: hidden;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.activity-form-section {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 30px;
  padding: 28px;
}

.activity-form-section + .activity-form-section {
  border-top: 1px solid var(--color-hairline);
}

.form-section-heading {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.form-section-heading > span {
  min-width: 28px;
  padding-top: 2px;
  color: var(--color-brand-deep);
  font-family: var(--font-mono);
  font-size: var(--font-size-caption);
  font-weight: 700;
}

.form-section-heading h2 {
  color: var(--color-ink);
  font-size: var(--font-size-body);
  line-height: 1.4;
}

.form-section-heading p {
  margin-top: 4px;
  color: var(--color-muted);
  font-size: var(--font-size-caption);
  line-height: 1.55;
}

.form-section-fields {
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 14px;
}

.form-section-fields .field-wide {
  grid-column: 1 / -1;
}

.field-label-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.activity-form textarea,
.activity-form input {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink);
  font: inherit;
  font-size: var(--font-size-body);
  transition: border-color var(--motion-fast), box-shadow var(--motion-fast), background var(--motion-fast);
}

.activity-form textarea {
  min-height: 126px;
  line-height: 1.65;
  resize: vertical;
}

.activity-form input:hover,
.activity-form textarea:hover {
  border-color: var(--color-muted);
}

.activity-form input:focus,
.activity-form textarea:focus {
  border-color: var(--color-focus);
  outline: 0;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-focus) 16%, transparent);
}

.activity-form .field-help,
.optional-label {
  color: var(--color-muted);
  font-size: var(--font-size-caption);
  font-weight: 500;
}

.optional-label {
  margin-left: 4px;
}

.limit-field {
  gap: 14px;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  background: var(--color-surface-subtle);
  cursor: pointer;
}

.check-row > span:last-child {
  display: grid;
  gap: 2px;
}

.check-row strong {
  color: var(--color-ink);
  font-size: var(--font-size-small);
}

.check-row small {
  color: var(--color-muted);
  font-size: var(--font-size-caption);
  font-weight: 450;
}

.check-control {
  position: relative;
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
}

.check-control input {
  position: absolute;
  width: 20px;
  min-height: 20px;
  margin: 0;
  opacity: 0;
}

.check-control span {
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-hairline-strong);
  border-radius: 6px;
  background: var(--color-surface);
}

.check-control input:checked + span {
  border-color: var(--color-brand-deep);
  background: var(--color-brand-deep);
}

.check-control input:checked + span::after {
  content: "";
  width: 8px;
  height: 4px;
  margin-top: -2px;
  border-bottom: 2px solid var(--color-on-primary);
  border-left: 2px solid var(--color-on-primary);
  transform: rotate(-45deg);
}

.check-control input:focus-visible + span {
  outline: 3px solid color-mix(in srgb, var(--color-focus) 24%, transparent);
  outline-offset: 2px;
}

.limit-input-wrap {
  width: 160px;
  position: relative;
}

.limit-input-wrap input {
  padding-right: 42px;
}

.limit-input-wrap > span {
  position: absolute;
  top: 50%;
  right: 14px;
  color: var(--color-muted);
  font-size: var(--font-size-small);
  transform: translateY(-50%);
}

.form-error {
  display: none;
  margin: 0 28px 18px;
  padding: 11px 13px;
  border-radius: var(--radius-md);
  background: var(--color-error-soft);
  color: var(--color-error);
  font-size: var(--font-size-small);
}

.form-error.is-visible {
  display: block;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 18px 28px;
  border-top: 1px solid var(--color-hairline);
  background: var(--color-surface-subtle);
}

.activity-preview {
  position: sticky;
  top: calc(var(--nav-height) + 20px);
  padding: 22px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.preview-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--color-muted);
  font-size: var(--font-size-caption);
  font-weight: 650;
}

.preview-status {
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: var(--color-surface-subtle);
}

.preview-status.is-ready {
  background: var(--color-success-soft);
  color: var(--color-success);
}

.preview-calendar-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  margin: 26px 0 18px;
  border-radius: var(--radius-md);
  background: var(--color-brand-soft);
  color: var(--color-brand-deep);
}

.preview-calendar-icon .icon {
  width: 23px;
  height: 23px;
}

.activity-preview h2 {
  overflow-wrap: anywhere;
  font-size: var(--font-size-section);
  line-height: 1.45;
}

.activity-preview > p:not(.preview-note) {
  margin-top: 8px;
  color: var(--color-secondary);
  font-size: var(--font-size-small);
  line-height: 1.65;
}

.preview-meta {
  display: grid;
  gap: 13px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--color-hairline);
}

.preview-meta > div {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 10px;
  font-size: var(--font-size-caption);
  line-height: 1.55;
}

.preview-meta dt { color: var(--color-muted); }
.preview-meta dd { color: var(--color-charcoal); overflow-wrap: anywhere; }

.preview-note {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 22px;
  padding: 12px;
  border-radius: var(--radius-md);
  background: var(--color-surface-subtle);
  color: var(--color-muted);
  font-size: var(--font-size-caption);
  line-height: 1.55;
}

.preview-note .icon {
  width: 15px;
  height: 15px;
  margin-top: 1px;
}

@media (max-width: 900px) {
  .activity-compose-layout { grid-template-columns: minmax(0, 1fr); }
  .activity-preview { position: static; grid-row: auto; }
  .preview-calendar-icon { margin-top: 20px; }
}

@media (max-width: 639px) {
  .activity-form-page { padding-top: 28px; padding-bottom: 72px; }
  .activity-form-intro { margin-bottom: 22px; }
  .activity-back { margin-bottom: 18px; }
  .activity-intro-copy p { font-size: var(--font-size-small); }
  .activity-compose-layout { gap: 14px; }
  .activity-preview { padding: 18px; }
  .activity-form-section {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 22px 16px;
  }
  .form-section-fields { grid-template-columns: 1fr; }
  .form-section-fields .field-wide { grid-column: auto; }
  .form-actions { padding: 16px; }
  .form-actions .button { flex: 1; }
  .form-error { margin-inline: 16px; }
}