:root {
  --es-bg: #f7f8fb;
  --es-surface: #ffffff;
  --es-border: #d7dce5;
  --es-text: #18253a;
  --es-muted: #5c6a7d;
  --es-accent: #163a63;
  --es-width: 1200px;
}

body {
  color: var(--es-text);
  background: var(--es-bg);
  line-height: 1.7;
}

.es-site-header {
  max-width: var(--es-width);
  margin: 0 auto;
  padding: 1rem;
}

.es-site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--es-border);
}

.es-site-header__brand-link {
  display: inline-flex;
  align-items: center;
  color: var(--es-text);
  text-decoration: none;
  min-height: 44px;
}

.es-site-header__logo {
  display: block;
  max-height: 56px;
  width: auto;
}

.es-site-header__title {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
}

.es-site-header__nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 1rem;
}

.es-site-header__link,
.es-site-header__button {
  text-decoration: none;
}

.es-site-header__link {
  color: var(--es-text);
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.es-site-header__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.75rem 1.1rem;
  background: var(--es-accent);
  border: 1px solid var(--es-accent);
  color: #ffffff;
}

.es-site-header__link:hover,
.es-site-header__button:hover {
  text-decoration: underline;
}

.es-site-footer {
  max-width: var(--es-width);
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.es-site-footer__inner {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--es-border);
}

.es-site-footer__title {
  margin: 0 0 0.75rem;
  font-weight: 600;
}

.es-site-footer__text {
  margin: 0.35rem 0 0;
  color: var(--es-muted);
  line-height: 1.7;
}

.es-site-footer__text a,
.es-site-footer__links a {
  color: var(--es-accent);
  text-decoration: none;
}

.es-site-footer__links {
  display: grid;
  gap: 0.65rem;
  align-content: start;
}

.es-site-footer__text a:hover,
.es-site-footer__links a:hover {
  text-decoration: underline;
}

.page_index_journal,
.obj_article_details {
  max-width: var(--es-width);
  margin: 0 auto;
}

.page_index_journal {
  padding: 2rem 1rem 4rem;
}

.es-home {
  display: grid;
  gap: 1.5rem;
}

.es-home__section,
.obj_article_details {
  background: var(--es-surface);
  border: 1px solid var(--es-border);
  padding: 2rem;
}

.es-home__hero {
  padding: 3rem 2rem;
}

.es-home__eyebrow {
  margin: 0 0 0.75rem;
  color: var(--es-muted);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.es-home__title,
.es-home__heading {
  margin: 0;
  line-height: 1.2;
}

.es-home__title {
  font-size: 2.75rem;
}

.es-home__heading {
  font-size: 1.6rem;
}

.es-home__tagline,
.es-home__copy {
  margin: 1rem 0 0;
  max-width: 60ch;
  color: var(--es-muted);
  line-height: 1.7;
}

.es-home__section-heading {
  margin-bottom: 1.25rem;
}

.es-home__issue-title {
  margin: 0 0 1rem;
  font-size: 1.1rem;
}

.es-home__issue-title a,
.es-link,
.es-article-card__title a,
.obj_article_details a {
  color: var(--es-accent);
}

.es-home__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.es-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.8rem 1.25rem;
  background: var(--es-accent);
  border: 1px solid var(--es-accent);
  color: #ffffff;
  text-decoration: none;
}

.es-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  text-decoration: none;
}

.es-link:hover,
.es-home__issue-title a:hover,
.es-article-card__title a:hover,
.obj_article_details a:hover {
  text-decoration: underline;
}

.es-article-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.es-article-card {
  background: var(--es-surface);
  border: 1px solid var(--es-border);
  padding: 1.25rem;
}

.es-article-card__title {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  line-height: 1.4;
}

.es-article-card__title a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.es-article-card__meta,
.obj_article_details .authors,
.obj_article_details .published,
.obj_article_details .doi {
  margin: 0.25rem 0 0;
  color: var(--es-muted);
}

.es-article-card__abstract {
  margin-top: 0.9rem;
  color: var(--es-muted);
  line-height: 1.6;
}

.es-article-card__download {
  margin: 1rem 0 0;
}

.es-article-card__download a {
  color: var(--es-accent);
  text-decoration: none;
}

.es-article-card__download a:hover {
  text-decoration: underline;
}

.es-article-detail {
  display: grid;
  gap: 2rem;
}

.es-article-detail__header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: start;
}

.es-article-detail__title {
  margin: 0;
  font-size: 2.25rem;
  line-height: 1.2;
}

.es-article-detail__authors {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.es-article-detail__author-name {
  font-weight: 600;
}

.es-article-detail__author-affiliation,
.es-article-detail__section-copy,
.es-article-detail__meta dd {
  color: var(--es-muted);
  line-height: 1.7;
}

.es-article-detail__meta {
  display: grid;
  gap: 0.85rem;
  margin: 1.5rem 0 0;
}

.es-article-detail__meta-item {
  display: grid;
  gap: 0.2rem;
}

.es-article-detail__meta dt {
  font-weight: 600;
}

.es-article-detail__meta dd {
  margin: 0;
}

.es-article-detail__summary {
  display: grid;
  gap: 1.5rem;
}

.es-article-detail__abstract {
  padding: 1.5rem;
  background: #eef3f8;
  border: 1px solid var(--es-border);
}

.es-article-detail__section-title {
  margin: 0 0 0.9rem;
  font-size: 1.2rem;
  line-height: 1.35;
}

.es-article-detail__main {
  display: grid;
  gap: 1.5rem;
}

.es-article-detail__content {
  line-height: 1.8;
}

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

.es-article-detail__galley-item a {
  color: var(--es-accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.es-article-detail__galley-item a:hover {
  text-decoration: underline;
}

.es-article-detail__footer-actions {
  margin-top: 0.5rem;
}

@media (max-width: 800px) {
  .es-site-header {
    padding: 0.75rem 1rem 0;
  }

  .es-site-header__inner,
  .es-site-header__nav,
  .es-site-footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .es-site-header__nav {
    width: 100%;
    gap: 0.25rem;
  }

  .es-site-header__link,
  .es-site-header__button {
    width: 100%;
  }

  .page_index_journal {
    padding: 1rem 1rem 3rem;
  }

  .es-home__section,
  .es-home__hero,
  .obj_article_details {
    padding: 1.5rem;
  }

  .es-home {
    gap: 1rem;
  }

  .es-home__title {
    font-size: 2rem;
  }

  .es-home__heading {
    font-size: 1.35rem;
  }

  .es-home__tagline,
  .es-home__copy,
  .es-article-card__abstract,
  .es-article-detail__section-copy,
  .es-article-detail__author-affiliation,
  .es-site-footer__text {
    line-height: 1.65;
  }

  .es-home__actions {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .es-button,
  .es-link {
    width: 100%;
    justify-content: center;
  }

  .es-article-detail__header {
    grid-template-columns: 1fr;
  }

  .es-article-detail__title {
    font-size: 1.8rem;
  }

  .es-article-detail__summary,
  .es-article-detail__main,
  .es-article-detail {
    gap: 1.25rem;
  }

  .es-article-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .es-site-header {
    padding: 0.5rem 0.875rem 0;
  }

  .page_index_journal {
    padding: 0.875rem 0.875rem 2.5rem;
  }

  .es-home__section,
  .es-home__hero,
  .obj_article_details,
  .es-article-card {
    padding: 1.25rem;
  }

  .es-home__title {
    font-size: 1.75rem;
  }

  .es-home__heading,
  .es-article-detail__section-title {
    font-size: 1.15rem;
  }

  .es-article-detail__title {
    font-size: 1.55rem;
  }

  .es-site-footer {
    padding: 0 0.875rem 1.75rem;
  }
}