/* =========================================================
   Rivista SIMG — Issue index stylesheet
   Issue hero, article groups, article cards.
   ========================================================= */

/* ---------- Issue hero ---------- */
.issue-hero {
  background:
    radial-gradient(800px 280px at 90% -10%, rgba(232, 121, 43, 0.1), transparent 70%),
    linear-gradient(135deg, #f0f4f7 0%, #e2ebf1 100%);
  padding: clamp(36px, 6vw, 64px) 20px clamp(32px, 5vw, 56px);
  border-bottom: 3px solid var(--color-primary);
}
.issue-hero-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.issue-cover {
  width: 280px;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  transform: rotate(-1.2deg);
  transition: transform var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease);
}
.issue-cover:hover {
  transform: rotate(0deg) translateY(-4px);
  box-shadow: 0 18px 40px rgba(15, 30, 45, 0.18);
}

.issue-meta {
  font-family: var(--font-ui);
}
.issue-meta .section-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-primary);
  background: rgba(26, 127, 181, 0.1);
  padding: 5px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}
.issue-meta h1 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: clamp(1.8rem, 1.2rem + 2.4vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-primary-deep);
  margin-bottom: 10px;
}
.issue-meta .issue-info {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 8px;
}
.issue-meta .issue-volume {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: 22px;
}
.issue-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Articles container ---------- */
.issue-content {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: clamp(32px, 5vw, 56px) 20px clamp(32px, 5vw, 64px);
}

/* ---------- Article groups ---------- */
.articles-group {
  margin-bottom: 44px;
}
.articles-group:last-child { margin-bottom: 0; }

.group-title {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-primary-dark);
  padding: 6px 0 6px 14px;
  border-left: 3px solid var(--color-accent);
  margin-bottom: 16px;
}

.article-list {
  list-style: none;
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 0;
}

/* ---------- Article card ---------- */
.article-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  transition:
    transform var(--t-fast) var(--ease),
    box-shadow var(--t-med) var(--ease),
    border-color var(--t-fast) var(--ease);
  position: relative;
}
.article-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  background: transparent;
  border-radius: 0 2px 2px 0;
  transition: background var(--t-fast) var(--ease);
}
.article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(26, 127, 181, 0.4);
}
.article-card:hover::before { background: var(--color-accent); }

.article-link {
  flex: 1;
  min-width: 0;
  text-decoration: none;
  color: inherit;
  display: block;
}
.article-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}
.article-link .article-title {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-primary-deep);
  margin-bottom: 4px;
}
.article-card:hover .article-link .article-title { color: var(--color-primary-dark); }
.article-link .article-authors {
  font-family: var(--font-ui);
  font-size: 0.83rem;
  color: var(--color-text-light);
  line-height: 1.45;
}

.pdf-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-ui);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
  background: rgba(26, 127, 181, 0.08);
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  text-decoration: none;
  border: 1px solid rgba(26, 127, 181, 0.18);
  transition:
    background var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
  white-space: nowrap;
  flex-shrink: 0;
}
.pdf-link::before {
  content: "⬇";
  font-size: 0.85em;
}
.pdf-link:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  transform: translateY(-1px);
}
.pdf-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .issue-hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }
  .issue-cover { width: min(220px, 60vw); transform: none; }
  .issue-meta .group-title { text-align: left; }
  .issue-actions { justify-content: center; }
}

@media (max-width: 640px) {
  .issue-hero { padding: 28px 16px 26px; }
  .issue-content { padding: 28px 16px 40px; }
  .article-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px;
  }
  .pdf-link { align-self: flex-end; }
  .issue-meta h1 { font-size: 1.55rem; }
}

/* ---------- Dark mode ---------- */
@media (prefers-color-scheme: dark) {
  .issue-hero {
    background:
      radial-gradient(800px 280px at 90% -10%, rgba(232, 121, 43, 0.16), transparent 70%),
      linear-gradient(135deg, #1d2733 0%, #14202c 100%);
  }
  .issue-meta h1 { color: #e0ecf5; }
  .issue-meta .section-badge,
  .group-title {
    color: #7ec3e6;
    background: rgba(79, 169, 217, 0.14);
  }
  .group-title { background: transparent; border-left-color: var(--color-accent); }
  .article-card { background: var(--color-surface); border-color: var(--color-border); }
  .article-link .article-title { color: #d9e8f3; }
  .pdf-link {
    color: #9bd0ec;
    background: rgba(79, 169, 217, 0.12);
    border-color: rgba(79, 169, 217, 0.25);
  }
  .pdf-link:hover { background: var(--color-primary); color: #0a1a2a; }
}