:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #111827;
  --sub: #6b7280;
  --line: #e5e7eb;
  --brand: #2563eb;
  --brand-weak: #dbeafe;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.hero {
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.hero__inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 36px 20px 28px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 34px;
}

.hero p {
  margin: 0;
  color: var(--sub);
}

.search-wrap { margin-top: 22px; }

.search-wrap input {
  width: min(680px, 100%);
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 15px;
  outline: none;
  background: #fff;
}

.search-wrap input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-weak);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}

.meta {
  color: var(--sub);
  font-size: 13px;
  margin-bottom: 14px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  min-height: 220px;
}

.card h3 {
  margin: 0;
  font-size: 18px;
}

.card .desc {
  margin-top: 10px;
  color: #374151;
  line-height: 1.45;
  flex: 1;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.tag {
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 12px;
  background: #f3f4f6;
  color: #374151;
}

.meta-line {
  margin-top: 12px;
  color: var(--sub);
  font-size: 12px;
}

.actions {
  margin-top: 14px;
  display: flex;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  padding: 0 12px;
  border-radius: 9px;
  border: 1px solid var(--line);
  color: #111827;
  text-decoration: none;
  font-size: 13px;
}

.btn:hover { background: #f8fafc; }

.btn--primary {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
}

.btn--primary:hover { background: #1d4ed8; }

.empty {
  margin-top: 24px;
  color: var(--sub);
  text-align: center;
}

.hidden { display: none !important; }

.preview {
  width: min(680px, calc(100vw - 32px));
  border: none;
  border-radius: 12px;
  padding: 0;
}

.preview::backdrop {
  background: rgba(0, 0, 0, 0.35);
}

.preview article {
  position: relative;
  padding: 20px;
}

.preview__close {
  position: absolute;
  top: 8px;
  right: 8px;
  border: none;
  background: transparent;
  font-size: 26px;
  cursor: pointer;
}

.preview__meta {
  margin-top: 12px;
  color: var(--sub);
  font-size: 13px;
}

.preview__actions {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}