.app-shell {
  min-height: 100dvh;
  padding-top: 63px;
  outline: none;
}

.app-header {
  position: fixed;
  z-index: 10;
  top: 0;
  right: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 62px;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 94%, transparent);
}

.wordmark {
  min-height: auto;
  padding: 8px 0;
  border: 0;
  background: transparent;
  font-size: 1.05rem;
  font-weight: 750;
  letter-spacing: -0.03em;
}

.app-header nav {
  display: flex;
  align-items: stretch;
  gap: 4px;
}

.app-header nav button {
  min-height: 40px;
  padding: 0 12px;
  border-color: transparent;
  background: transparent;
  color: var(--muted);
  font-size: 0.86rem;
}

.app-header nav button:hover,
.app-header nav button.active {
  color: var(--text);
}

.app-header nav button.active {
  border-bottom-color: var(--accent);
}

main {
  width: 100%;
}

.loading,
.empty-state {
  max-width: 760px;
  margin: 18vh auto;
  padding: 0 24px;
  color: var(--muted);
  text-align: center;
}

.error-banner,
.notice-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 28px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-size: 0.86rem;
}

.error-banner {
  border-left: 3px solid var(--danger);
}

.notice-banner {
  border-left: 3px solid var(--accent);
}

.error-banner button,
.notice-banner button {
  min-height: 32px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 0.8rem;
}

.list-page {
  width: min(920px, calc(100% - 48px));
  margin: 0 auto;
  padding: 56px 0 96px;
}

.page-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 36px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.page-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.page-heading select {
  padding: 0 34px 0 12px;
}

.filters {
  display: grid;
  grid-template-columns: minmax(200px, 2fr) repeat(3, minmax(130px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

.filters label,
.import-control {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.76rem;
}

.filters input,
.filters select {
  width: 100%;
  padding: 0 12px;
  color: var(--text);
  font-size: 0.9rem;
}

.expression-list {
  padding: 0;
  margin: 0;
  list-style: none;
}

.expression-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.expression-list p {
  margin: 0 0 6px;
  line-height: 1.5;
}

.expression-list li > div:last-child,
.export-buttons {
  display: flex;
  flex: 0 0 auto;
  gap: 8px;
}

@media (max-width: 720px) {
  .app-header {
    align-items: flex-start;
    min-height: 96px;
    padding: 10px 14px 0;
  }

  .app-shell {
    padding-top: 97px;
  }

  .wordmark {
    padding-top: 10px;
  }

  .app-header nav {
    display: grid;
    grid-template-columns: repeat(3, auto);
  }

  .app-header nav button {
    min-height: 36px;
    padding: 0 8px;
    font-size: 0.75rem;
  }

  .list-page {
    width: min(100% - 28px, 920px);
    padding-top: 34px;
  }

  .page-heading {
    align-items: flex-start;
    flex-direction: column;
    margin-bottom: 26px;
  }

  .filters {
    grid-template-columns: 1fr 1fr;
  }

  .filters label:first-child {
    grid-column: 1 / -1;
  }

  .expression-list li {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .error-banner,
  .notice-banner {
    padding-inline: 14px;
  }
}