* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Helvetica Neue", Helvetica, Arial, system-ui, -apple-system, sans-serif;
  background: #f6f7f9;
  color: #1f2933;
  line-height: 1.5;
}

header {
  background: linear-gradient(135deg, #1d3557, #457b9d);
  color: #fff;
  padding: 28px 20px;
  text-align: center;
}

header.compact {
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  padding: 16px 20px;
  text-align: left;
}
header.compact .back { margin-right: 16px; }

header h1 { font-size: 26px; letter-spacing: 0.5px; }
header.compact h1 { font-size: 20px; }
.tagline { opacity: 0.85; margin-top: 4px; font-size: 14px; }

.back { color: #fff; text-decoration: none; font-weight: 600; }
.back:hover { text-decoration: underline; }

#search-form {
  max-width: 560px;
  margin: 18px auto 0;
}

#search-input {
  width: calc(100% - 84px);
  padding: 10px 14px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
}

#search-form button {
  width: 76px;
  margin-left: 8px;
  padding: 10px 0;
  border: none;
  border-radius: 8px;
  background: #e63946;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  font-size: 15px;
}

#search-form button:hover { background: #c1121f; }

main { max-width: 960px; margin: 0 auto; padding: 24px 20px 60px; }

.meta { color: #5b6770; margin-bottom: 14px; font-size: 14px; }

.grid {
  display: -webkit-flex;
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
  margin: -7px;
}

.card {
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-justify-content: space-between;
  justify-content: space-between;
  -webkit-flex: 1 1 240px;
  flex: 1 1 240px;
  min-width: 190px;
  margin: 7px;
  background: #fff;
  border: 1px solid #e4e7eb;
  border-radius: 10px;
  padding: 16px;
  text-decoration: none;
  color: inherit;
}

.card:hover { box-shadow: 0 4px 14px rgba(0,0,0,0.08); }
.card h3 { font-size: 15px; color: #1d3557; margin-bottom: 4px; }
.card .author { font-size: 13px; color: #5b6770; }
.card .tags { font-size: 12px; color: #457b9d; margin-top: 8px; }
.download-hint { margin-top: 12px; font-size: 13px; font-weight: 600; color: #e63946; }

.pager {
  text-align: center;
  margin-top: 24px;
  font-size: 14px;
  color: #5b6770;
}

.pager button {
  padding: 8px 16px;
  border: 1px solid #cbd2d9;
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  font-size: 14px;
  margin: 0 8px;
}

.pager button:hover { background: #f0f2f5; }

.loading, .empty, .error { color: #5b6770; text-align: center; padding: 30px; }
.error { color: #c1121f; }

.detail {
  background: #fff;
  border: 1px solid #e4e7eb;
  border-radius: 12px;
  padding: 28px;
}

.detail h2 { color: #1d3557; margin-bottom: 6px; }
.detail .author { color: #5b6770; margin-bottom: 20px; }

.info { width: 100%; border-collapse: collapse; font-size: 14px; margin-bottom: 20px; }
.info td { padding: 8px 0; border-bottom: 1px solid #eef0f3; }
.info td:first-child { color: #5b6770; width: 160px; }

.desc { margin-bottom: 24px; font-size: 14px; color: #33414d; }

.btn {
  display: inline-block;
  padding: 12px 26px;
  background: #e63946;
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.btn:hover { background: #c1121f; }