:root {
  --bg: #f0f2f5;
  --card: #ffffff;
  --yang-bg: #fffbf0;
  --yang-border: #f0a500;
  --accent: #1a7a4a;
  --accent-light: #27ae60;
  --yang-color: #d4870a;
  --qa-bg: #f0f7ff;
  --qa-border: #90caf9;
  --qa-answer-bg: #fffbf0;
  --text: #1a1a1a;
  --text-muted: #888;
  --border: #e4e6ea;
  --reply-bg: #f5f6f8;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.04);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.12), 0 8px 32px rgba(0,0,0,0.06);
  --radius: 14px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  padding-bottom: 80px;
}

/* ── Header ── */
.site-header {
  background: linear-gradient(135deg, #1a5c38 0%, #2c8a55 60%, #1a7a4a 100%);
  color: #fff;
  padding: 36px 20px 28px;
  text-align: center;
}
.site-header .hero {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 10px;
}
.site-header .hero-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 3px solid rgba(255,255,255,0.8);
  object-fit: cover;
}
.site-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  text-shadow: 0 1px 4px rgba(0,0,0,0.2);
}
.site-header .subtitle {
  font-size: 0.88rem;
  opacity: 0.85;
  margin-top: 4px;
}
.site-header .stats-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.site-header .stat-item {
  background: rgba(255,255,255,0.18);
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 0.83rem;
  backdrop-filter: blur(4px);
}

/* ── Toolbar & TOC ── */
.toolbar {
  max-width: 780px;
  margin: 16px auto 0;
  padding: 0 16px;
  display: flex;
  gap: 10px;
  align-items: center;
}
.toc-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 7px 18px;
  font-size: 0.84rem;
  cursor: pointer;
  font-family: inherit;
}
.toc-btn:hover { background: var(--accent-light); }

#toc {
  display: none;
  max-width: 780px;
  margin: 12px auto 0;
  padding: 0 16px;
}
#toc.open { display: block; }
.toc-inner {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  max-height: 420px;
  overflow-y: auto;
  padding: 12px 0;
}
#toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 18px;
  text-decoration: none;
  font-size: 0.83rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}
#toc a:last-child { border-bottom: none; }
#toc a:hover { background: #f5faf7; color: var(--accent); }
.toc-num { color: var(--text-muted); min-width: 32px; font-size: 0.78rem; }
.toc-time { color: var(--accent); min-width: 120px; font-size: 0.8rem; font-weight: 500; }
.toc-preview { color: var(--text); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }

/* ── Posts ── */
.posts {
  max-width: 780px;
  margin: 20px auto 0;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.post {
  background: var(--card);
  border-radius: var(--radius);
  padding: 18px 20px 14px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: box-shadow 0.2s;
}
.post:hover { box-shadow: var(--shadow-hover); }
.post:target { box-shadow: 0 0 0 3px var(--accent-light), var(--shadow-hover); }
.post-qa { border-left: 4px solid var(--qa-border); }

.post-header {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.post-num {
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
  flex-shrink: 0;
}
.post-time { font-weight: 500; color: #555; }
.digest-badge {
  background: #fff3cd;
  color: #c07000;
  border: 1px solid #ffc107;
  border-radius: 10px;
  padding: 1px 8px;
  font-size: 0.76rem;
  font-weight: 600;
}
.qa-type-badge {
  background: #e3f2fd;
  color: #1565c0;
  border: 1px solid #90caf9;
  border-radius: 10px;
  padding: 1px 8px;
  font-size: 0.76rem;
  font-weight: 600;
}
.post-link {
  margin-left: auto;
  color: var(--accent-light);
  text-decoration: none;
  font-size: 0.78rem;
}
.post-link:hover { text-decoration: underline; }

.post-author-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.post-avatar-wrap { display: flex; align-items: center; flex-shrink: 0; }
.post-author-info { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }

/* ── Avatars ── */
.avatar, .avatar-fallback {
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  display: block;
}
.avatar-fallback {
  background: #c8e6c9;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.avatar-yang,
.avatar-fallback.avatar-yang { border: 2px solid var(--yang-color); }
.avatar-fallback.avatar-yang { background: #fff3e0; color: var(--yang-color); }

/* ── User name ── */
.user-name { font-weight: 600; font-size: 0.95rem; color: #222; }
.yang-name { color: var(--yang-color); }
.yang-badge {
  background: var(--yang-color);
  color: #fff;
  font-size: 0.68rem;
  padding: 1px 6px;
  border-radius: 8px;
  font-weight: 700;
  vertical-align: middle;
  margin-left: 2px;
}
.user-location { color: var(--text-muted); font-size: 0.78rem; }

/* ── Post body ── */
.post-body { margin-bottom: 12px; }
.post-text {
  font-size: 0.97rem;
  line-height: 1.85;
  white-space: pre-wrap;
  word-break: break-word;
}
.post-images { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.post-img {
  max-width: 220px;
  max-height: 220px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--border);
  cursor: zoom-in;
  transition: transform 0.15s;
}
.post-img:hover { transform: scale(1.02); }
.post-files { margin-top: 10px; }
.file-link {
  display: inline-block;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.86rem;
  background: #e8f5e9;
  padding: 3px 10px;
  border-radius: 6px;
  margin-right: 8px;
  margin-bottom: 4px;
}
.post-article { margin-top: 10px; font-size: 0.88rem; }
.post-article a { color: var(--accent); text-decoration: none; }

/* ── Q&A ── */
.qa-question, .qa-answer {
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 10px;
}
.qa-question { background: var(--qa-bg); border: 1px solid var(--qa-border); }
.qa-answer { background: var(--qa-answer-bg); border: 1px solid rgba(240,165,0,0.4); }
.qa-label { font-size: 0.78rem; font-weight: 700; color: #1565c0; margin-bottom: 8px; }
.yang-label { color: var(--yang-color); }
.qa-row { display: flex; gap: 10px; align-items: flex-start; }
.qa-text {
  font-size: 0.95rem;
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-word;
  margin-top: 4px;
}

/* ── Post footer ── */
.post-footer {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
  padding-top: 10px;
  color: var(--text-muted);
  align-items: center;
}
.emoji-stat { background: #f0f0f0; border-radius: 12px; padding: 2px 10px; font-size: 0.82rem; }
.stat { background: #f0f0f0; border-radius: 12px; padding: 2px 10px; }

/* ── Comments ── */
.comments-section {
  margin-top: 14px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}
.comments-title {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.comment {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #fafafa;
  border: 1px solid var(--border);
}
.yang-comment { background: var(--yang-bg); border-color: rgba(240,165,0,0.3); }
.comment-left { flex-shrink: 0; padding-top: 2px; }
.comment-right { flex: 1; min-width: 0; }
.comment-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}
.comment-time { font-size: 0.76rem; color: var(--text-muted); }
.comment-text {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #333;
  white-space: pre-wrap;
  word-break: break-word;
}
.at-name { color: var(--accent-light); font-weight: 500; }
.comment-actions { display: flex; gap: 10px; margin-top: 5px; font-size: 0.78rem; color: var(--text-muted); }
.action-liked { color: #e74c3c; }
.replies { margin-top: 8px; padding-left: 4px; }
.reply {
  display: flex;
  gap: 8px;
  margin-bottom: 7px;
  padding: 7px 10px;
  border-radius: 8px;
  background: var(--reply-bg);
  border-left: 2px solid #ddd;
  font-size: 0.87rem;
}
.yang-reply { background: #fff8e6; border-left-color: var(--yang-color); }

/* ── Lightbox ── */
#lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}
#lightbox.active { display: flex; }
#lightbox img {
  max-width: 92vw;
  max-height: 92vh;
  border-radius: 8px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

/* ── Back to top ── */
#back-top {
  position: fixed;
  right: 22px;
  bottom: 28px;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
}
#back-top.visible { opacity: 1; pointer-events: auto; }

/* ── Responsive ── */
@media (max-width: 600px) {
  .post { padding: 14px 13px 11px; }
  .post-img { max-width: 140px; max-height: 140px; }
  .site-header h1 { font-size: 1.3rem; }
  .toc-time { min-width: 90px; font-size: 0.75rem; }
}

/* ── Pagination ── */
.pagination {
  max-width: 780px;
  margin: 12px auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
}
.page-btn {
  min-width: 34px;
  height: 34px;
  padding: 0 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  font-family: inherit;
}
.page-btn:hover:not(.disabled):not(.active) {
  background: #e8f5e9;
  border-color: var(--accent-light);
  color: var(--accent);
}
.page-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  font-weight: 700;
  cursor: default;
}
.page-btn.disabled {
  opacity: 0.35;
  cursor: default;
}
.page-dots {
  padding: 0 4px;
  color: var(--text-muted);
  font-size: 0.9rem;
  user-select: none;
}
.page-jump {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
}
.page-input {
  width: 48px;
  height: 34px;
  border: 1px solid var(--border);
  border-radius: 8px;
  text-align: center;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--text);
  background: var(--card);
  outline: none;
}
.page-input:focus { border-color: var(--accent-light); }
.page-total {
  font-size: 0.83rem;
  color: var(--text-muted);
  white-space: nowrap;
}
@media (max-width: 600px) {
  .page-btn { min-width: 30px; height: 30px; font-size: 0.8rem; }
  .page-input { width: 40px; height: 30px; }
}