/* ========================================
   BB-Announcement 样式
   ======================================== */

:root {
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --bg: #f1f5f9;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.1);
  --max-width: 900px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.subtitle {
  font-size: .85rem;
  color: var(--text-secondary);
}

/* ---------- 列表页 ---------- */
.page-title {
  margin: 32px 0 24px;
  font-size: 1.6rem;
  font-weight: 700;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.announcement-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  cursor: pointer;
  transition: transform .18s, box-shadow .18s;
}

.announcement-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.card-cover {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: var(--border);
}

.card-body {
  padding: 16px 20px 20px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
}

.card-date {
  font-size: .8rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.card-summary {
  font-size: .88rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- 详情页 ---------- */
.hidden { display: none !important; }

#detail-view {
  margin: 32px 0 60px;
}

.btn-back {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 18px;
  font-size: .9rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all .15s;
  margin-bottom: 24px;
}

.btn-back:hover {
  background: var(--card-bg);
  color: var(--text);
}

.detail-hero {
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 24px;
  background: var(--border);
}

.detail-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.detail-date {
  font-size: .85rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

/* Markdown 渲染内容 */
.markdown-body { line-height: 1.8; }

.markdown-body h1 { font-size: 1.6rem; margin: 28px 0 14px; }
.markdown-body h2 { font-size: 1.3rem; margin: 24px 0 12px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.markdown-body h3 { font-size: 1.1rem; margin: 20px 0 10px; }
.markdown-body p  { margin: 10px 0; }
.markdown-body ul, .markdown-body ol { padding-left: 24px; margin: 10px 0; }
.markdown-body li { margin: 4px 0; }
.markdown-body code {
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: .88em;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}
.markdown-body pre {
  background: #1e293b;
  color: #e2e8f0;
  padding: 16px 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 14px 0;
  font-size: .85rem;
  line-height: 1.6;
}
.markdown-body pre code { background: none; padding: 0; color: inherit; }
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 8px 14px;
  text-align: left;
}
.markdown-body th { background: #f8fafc; font-weight: 600; }
.markdown-body blockquote {
  border-left: 4px solid var(--primary);
  padding: 8px 16px;
  margin: 14px 0;
  background: #f8fafc;
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
}
.markdown-body a { color: var(--primary); }
.markdown-body img { max-width: 100%; border-radius: 8px; }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }

/* ---------- 状态 ---------- */
.loading, .empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  font-size: .95rem;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: auto;
  padding: 24px 0;
  text-align: center;
  font-size: .82rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .card-grid { grid-template-columns: 1fr; }
  .detail-title { font-size: 1.4rem; }
}