/* ── Article Hero ── */
.article-hero {
  background: var(--gradient-brand);
  padding: clamp(24px, 3vw, 32px) 0 clamp(32px, 4vw, 40px);
  position: relative;
}
.article-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    ellipse at 80% 50%,
    rgba(215, 170, 66, 0.12) 0%,
    transparent 60%
  );
}
.article-hero__inner {
  max-width: 1400px;
  margin-inline: auto;
  padding-inline: 40px;
  position: relative;
  z-index: 1;
}
.article-hero__badges {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.article-badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
.article-badge--open {
  background: var(--accent);
  color: var(--text-on-accent);
}
.article-badge--type {
  background: rgba(254, 248, 234, 0.15);
  color: var(--text-on-brand);
}
.article-hero__heading {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 36px);
  font-weight: 700;
  color: var(--text-on-brand);
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
  /* max-width: 700px; */
}
.article-hero__meta-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
}
.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: clamp(12px, 1.2vw, 14px);
  color: var(--text-on-brand-sub);
}
.article-meta-item svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  color: var(--accent);
}

/* ── Article layout ── */
.article-layout {
  background: var(--surface-tint-dim);
  padding: clamp(28px, 5vw, 48px) 0 clamp(48px, 7vw, 72px);
}
.article-layout__inner {
  display: grid;
  grid-template-columns: 2fr 0.6fr;
  gap: 28px;
  max-width: 1400px;
  margin-inline: auto;
  padding-inline: 40px;
  align-items: start;
}

/* ── Article sections ── */
div.reveal{
  margin-top: 20px;
  padding-top: 10px;
}
.article-body {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.article-section {
  background: var(--surface-primary);
  border: 1px solid var(--border-brand);
  border-radius: var(--radius-xl);
  padding: clamp(18px, 2vw, 28px) clamp(16px, 2vw, 28px) clamp(16px, 2vw, 24px);
  /* margin-bottom: 16px; */
}
.article-section__header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  margin-bottom: 5px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-brand);
}
.article-section__header svg {
  width: 20px;
  height: 20px;
  color: var(--brand-dark);
  flex-shrink: 0;
}
.article-section__title {
  font-family: var(--font-display);
  font-size: clamp(15px, 1.4vw, 18px);
  font-weight: 600;
  color: var(--brand-dark);
  letter-spacing: -0.36px;
}
.article-section__title--plain {
  font-family: var(--font-display);
  font-size: clamp(15px, 1.4vw, 18px);
  color: var(--brand-dark);
  letter-spacing: -0.36px;
  margin-bottom: 10px;
  padding-bottom: 12px;
}

/* Authors */
.authors-list {
  display: flex;
  flex-direction: column;
}
.author-entry {
  margin: 8px 0;
  padding: 0 6px;
  border-left: 2px solid var(--accent);
}
.author-entry__name {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(14px, 1.3vw, 16px);
  font-weight: 300;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.author-entry__affiliation {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Abstract */
.abstract-body {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.abstract-body p {
  font-family: var(--font-sans);
  font-size: clamp(13px, 1.3vw, 15px);
  color: rgba(0, 23, 13, 0.85);
  line-height: 1.8;
  text-align: justify;
}

/* Keywords */
.keywords-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.keyword-tag {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  color: var(--brand-dark);
  background: rgba(249, 238, 209, 0.6);
  border-radius: 20px;
  padding: 5px 14px;
  transition:
    background 0.2s,
    color 0.2s;
}
.keyword-tag:hover {
  background: var(--brand-dark);
  color: var(--surface-primary);
}

/* Citation block */
.citation-block {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.citation-block__text {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-mid);
  line-height: 1.7;
}
.citation-block__text em {
  font-style: italic;
}
.citation-block__license {
  background: var(--surface-secondary);
  border: 1px solid var(--border-brand);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}
.citation-block__license p {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* References */
.references-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.reference-item {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 8px;
  padding: 7px 0;
  border-bottom: 1px solid var(--surface-tint);
  align-items: start;
}
.reference-item:last-child {
  border-bottom: none;
}
.reference-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  padding: 2px 6px;
  text-align: center;
  align-self: start;
  margin-top: 1px;
  white-space: nowrap;
}
.reference-item__text {
  font-family: var(--font-sans);
  font-size: 13px;
  color: rgba(0, 23, 13, 0.85);
  line-height: 1.65;
}

/* ── Sidebar ── */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: sticky;
  top: 96px;
}
.sidebar-access-box {
  background: var(--surface-primary);
  border: 1px solid var(--border-brand);
  border-radius: var(--radius-xl);
  padding-bottom: 16px;
  overflow: hidden;
}
.sidebar-access-box__header {
  background: var(--gradient-brand);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sidebar-access-box__label {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
}
.sidebar-access-box__title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-on-brand);
}
.sidebar-access-box__actions {
  padding: 14px 14px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.btn-access {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    opacity 0.2s,
    transform 0.15s;
  text-align: center;
}
/* .btn-access svg {
  width: 15px;
  height: 15px;
} */
.btn-access--primary {
  /* background: var(--gradient-brand); */
  background: var(--contrast-red);
  color: var(--text-on-brand);
  border: none;
}
.btn-access--secondary {
  background: var(--surface-primary);
  color: var(--brand-dark);
  border: 1px solid var(--border-brand-mid);
  box-shadow: var(--shadow-btn);
}
.btn-access:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}
.btn-access--submit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 300;
  padding: 11px 14px;
  border-radius: var(--radius-md);
  background: var(--gradient-accent);
  color: var(--text-on-accent);
  transition:
    opacity 0.2s,
    transform 0.15s;
}
.btn-access--submit:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}
.btn-access--submit svg {
  width: 15px;
  height: 15px;
}
.sidebar-doi {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: var(--surface-secondary);
  border-radius: var(--radius-lg);
}
.sidebar-doi__label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
}
.sidebar-doi__link {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  word-break: break-all;
  transition: color 0.2s;
}
.sidebar-doi__link:hover {
  color: var(--brand-dark);
}
.sidebar-issue-details {
  background: var(--surface-primary);
  border: 1px solid var(--border-brand);
  border-radius: var(--radius-lg);
  padding: 18px 18px 14px;
}
.sidebar-issue-details__heading {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 300;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--brand-dark);
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-brand);
}
.sidebar-issue-details__list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 14px;
}
.sidebar-issue-details__row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--surface-tint);
  font-family: var(--font-sans);
}
.sidebar-issue-details__row:last-child {
  border-bottom: none;
}
.sidebar-issue-details__label {
  font-size: 13px;
  color: var(--text-muted);
}
.sidebar-issue-details__value {
  font-size: 13px;
  color: var(--text-mid);
}
.sidebar-issue-details__value--bold {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 13px;
}
.btn-back-issue {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  padding: 9px 14px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-btn);
  border: 1px solid var(--border-brand-mid);
  color: var(--brand-dark);
  background: var(--surface-primary);
  transition:
    background 0.2s,
    color 0.2s,
    transform 0.15s;
}
.btn-back-issue:hover {
  background: var(--brand-dark);
  color: var(--text-on-brand);
  transform: translateY(-1px);
}

/* ─── Responsive ─── */
@media (max-width: 1024px) {
  .article-layout__inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .article-sidebar {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .sidebar-issue-details {
    grid-column: 1 / -1;
  }
}
@media (max-width: 768px) {
  .article-hero__inner {
    padding-inline: 24px;
  }
  .article-layout__inner {
    padding-inline: 24px;
  }
  .article-sidebar {
    grid-template-columns: 1fr;
  }
  .article-hero__meta-row {
    gap: 10px;
  }
  .article-section {
    padding: 18px 16px;
  }
}
@media (max-width: 480px) {
  .article-hero {
    padding: 20px 0 28px;
  }
  .article-hero__inner {
    padding-inline: 16px;
  }
  .article-layout {
    padding: 20px 0 40px;
  }
  .article-layout__inner {
    padding-inline: 16px;
    gap: 14px;
  }
  .article-section {
    padding: 14px 12px;
    /* margin-bottom: 12px; */
  }
  .article-hero__heading {
    font-size: 18px;
  }
  .article-hero__meta-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 7px;
  }
  .reference-item {
    grid-template-columns: 28px 1fr;
  }
}