:root{
  --title: #474139; /* Titles */
  --muted: #909884; /* muted text */
  --accent: #aecda8; /* accent */
  --bg: #cedabe; /* page background */
  --card-bg: #ffffff;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background:var(--bg);
  color:var(--title);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
.container{
  max-width:1100px;
  margin:0 auto;
  padding:24px;
}
.site-header{
  background:linear-gradient(180deg, rgba(255,255,255,0.4), rgba(255,255,255,0.2));
  border-bottom:1px solid rgba(0,0,0,0.06);
}
.site-header h1{
  margin:12px 0 4px 0;
  color:var(--title);
  font-size:28px;
}
.subtitle{
  margin:0 0 12px 0;
  color:var(--muted);
}
.about h2{color:var(--title);font-size:20px;margin-top:0}
.about p{line-height:1.5;color:rgba(71,65,57,0.9)}
.small{font-size:0.9rem;color:var(--muted)}

.materials{margin-top:18px}
.materials-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:18px;
}

.list-block{
  background:var(--card-bg);
  padding:16px;
  border-radius:12px;
  box-shadow:0 4px 12px rgba(0,0,0,0.04);
  border:1px solid rgba(0,0,0,0.04);
}
.list-block h3{margin-top:0;color:var(--title)}

.pdf-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px}
.pdf-item{
  border-radius:10px;
  padding:12px;
  border:1px solid rgba(71,65,57,0.07);
  background:linear-gradient(180deg, rgba(254,255,250,0.9), rgba(255,255,255,0.98));
}
.pdf-meta{display:flex;align-items:center;justify-content:space-between;gap:12px}
.pdf-title{font-weight:600;color:var(--title)}
.pdf-actions{display:flex;gap:8px;align-items:center}
.pdf-link{
  display:inline-block;
  padding:6px 10px;
  background:var(--accent);
  color:var(--title);
  border-radius:8px;
  text-decoration:none;
  font-weight:600;
}
.pdf-link:hover{filter:brightness(0.95)}
.preview-btn{
  padding:6px 10px;
  border-radius:8px;
  border:1px solid rgba(0,0,0,0.06);
  background:transparent;
  cursor:pointer;
}
.pdf-preview{margin-top:12px}
.pdf-preview iframe{width:100%;height:480px;border:0;border-radius:8px}

.site-footer{padding:12px 0;margin-top:18px;color:var(--muted)}

.site-footer .container > small{
  display:block;
  text-align:center;
  margin-top:8px;
}

.list-block.full-page{
  width:100%;
  padding:32px 24px;
  display:flex;
  flex-direction:column;
  justify-content:flex-start;
}

.list-block.full-page .pdf-list{
  margin-top:12px;
  padding-right:6px;
}

.pdf-preview iframe{width:100%;height:480px;border:0;border-radius:8px}


@media (max-width:600px){
  .pdf-preview iframe{height:40vh}
}

@media (max-width:600px){
  .container{padding:12px}
  .site-header h1{font-size:22px}
  .subtitle{font-size:0.95rem}

  .list-block{padding:12px;border-radius:10px}
  .list-block.full-page{padding:16px}

  .pdf-list{gap:8px}
  .pdf-item{padding:8px;border-radius:8px}
  .pdf-title{font-size:0.95rem}

  .pdf-actions .pdf-link, .pdf-actions .preview-btn{
    padding:6px 8px;font-size:0.9rem
  }

  .pdf-preview iframe{height:220px}
}