:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --panel-2: #f2f4f8;
  --line: #d8dee8;
  --text: #1e2533;
  --muted: #4b5568;
  --accent: #d9a322;
  --accent-2: #b78613;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  font-family: 'Poppins', sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page {
  max-width: 1060px;
  margin: 0 auto;
  padding: 28px 18px 48px;
}

.topbar {
  margin-bottom: 18px;
}

.back-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.back-link:hover {
  color: var(--accent-2);
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  margin-bottom: 18px;
  box-shadow: 0 10px 26px rgba(24, 33, 53, 0.08);
}

.hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 20px;
  align-items: stretch;
}

.type {
  margin: 0 0 8px;
  color: var(--accent);
  font-weight: 600;
}

h1 {
  margin: 0 0 14px;
  font-size: clamp(1.35rem, 2vw, 2rem);
  line-height: 1.3;
}

h2 {
  margin: 0 0 12px;
  font-size: 1.2rem;
}

.authors,
.venue {
  margin: 0 0 8px;
  color: var(--muted);
}

.actions {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-block;
  padding: 9px 13px;
  border-radius: 10px;
  border: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
  background: var(--panel-2);
  font-size: 0.92rem;
}

.btn:hover {
  border-color: var(--accent);
}

.btn.primary {
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  border-color: transparent;
}

.hero-image-wrap {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  min-height: 250px;
  background: #ffffff;
}

.hero-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

p {
  margin: 0 0 12px;
  color: var(--muted);
  line-height: 1.72;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.tags span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 11px;
  color: var(--muted);
  font-size: 0.85rem;
  background: var(--panel-2);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.section-head a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
}

.section-head a:hover {
  color: var(--accent-2);
}

.pdf-frame {
  width: 100%;
  height: 650px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.media-grid img {
  width: 100%;
  height: 100%;
  min-height: 180px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #0f1521;
}

pre {
  margin: 0;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  overflow-x: auto;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  color: var(--text);
  font-size: 0.88rem;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
  }

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

  .pdf-frame {
    height: 500px;
  }
}