:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --text: #151a2d;
  --muted: #58607a;
  --border: #dde1ea;
  --accent: #3056d3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

.container {
  max-width: 1100px;
  margin: 1.5rem auto;
  padding: 0 1rem 2rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 10px rgba(13, 26, 70, 0.04);
}

#upper {
  text-align: center;
}

#upper .abstract-block {
  text-align: left;
  margin-top: 1rem;
}

h1,
h2,
h3 {
  margin: 0 0 0.5rem;
}

p {
  margin: 0.35rem 0;
}

.abstract-block .meta-link {
  margin-top: 0.5rem;
}

.meta-link {
  margin-top: 0.75rem;
}

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

.hero-image {
  display: block;
  margin: 1rem auto 0;
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.section-description {
  color: var(--muted);
  margin-bottom: 0.9rem;
}

.sample-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.9rem;
  margin-bottom: 0.8rem;
}

.sample-title {
  font-size: 1.1rem;
}

.sample-meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.sample-text {
  background: #f4f6fa;
  border-left: 3px solid var(--accent);
  padding: 0.6rem;
  border-radius: 6px;
  margin: 0.7rem 0;
}

.track {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 0.7rem;
  align-items: center;
  margin: 0.45rem 0;
}

.track-label {
  font-weight: 600;
  font-size: 0.95rem;
}

audio {
  width: 100%;
}

.placeholder {
  border: 1px dashed var(--border);
  color: var(--muted);
  border-radius: 6px;
  padding: 0.5rem;
  font-size: 0.9rem;
}

@media (max-width: 760px) {
  .track {
    grid-template-columns: 1fr;
  }
}