:root {
  --bg: #0b1220;
  --card: #121b2e;
  --text: #e6ecff;
  --muted: #95a2c9;
  --accent: #6ea8ff;
  --border: #23304f;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(180deg, #0a1020, #0c1528);
  color: var(--text);
}
.container { width: min(1100px, 94vw); margin: 0 auto; }
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 38px 0 24px;
}
.site-header h1 { margin: 0 0 8px; }
.site-header p { margin: 0 0 12px; color: var(--muted); }
.site-header nav a {
  color: var(--accent);
  text-decoration: none;
  margin-right: 14px;
}
.main-layout {
  padding: 22px 0 48px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 16px;
  align-items: start;
}

.content-column {
  display: grid;
  gap: 16px;
}

.card {
  background: color-mix(in srgb, var(--card) 90%, black 10%);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
}
.post-list { list-style: none; margin: 0; padding: 0; }
.post-list li { padding: 12px 0; border-bottom: 1px dashed var(--border); }
.post-list li:last-child { border-bottom: none; }
.post-link { color: #dce6ff; text-decoration: none; font-size: 18px; font-weight: 600; }
.post-meta { color: var(--muted); font-size: 13px; margin-top: 4px; }
.btn {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  background: #17233f;
  color: var(--text);
  cursor: pointer;
}
.hidden { display: none; }
#post-content h1, #post-content h2, #post-content h3 { margin-top: 28px; margin-bottom: 14px; line-height: 1.35; }
#post-content p { line-height: 2.05; color: #e7edff; margin: 0 0 1.05em; font-size: 17px; letter-spacing: 0.2px; }
#post-content ul, #post-content ol { line-height: 1.95; padding-left: 1.4em; margin: 0.6em 0 1em; }
#post-content li { margin-bottom: 0.5em; }
#post-content blockquote {
  margin: 1.2em 0;
  padding: 0.8em 1em;
  border-left: 3px solid var(--accent);
  background: #0f1a31;
  color: #d4deff;
  border-radius: 8px;
}
#post-content pre {
  background: #0c1324;
  border: 1px solid var(--border);
  padding: 14px;
  overflow: auto;
  border-radius: 10px;
  line-height: 1.7;
}
#post-content code { font-family: Consolas, Menlo, monospace; }
.posts-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 18px;
  align-items: start;
}

.index-panel {
  position: sticky;
  top: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  background: #0f172b;
}

.index-panel h3 {
  margin: 14px 0 10px;
  font-size: 14px;
  color: #b9c8ef;
}

.filter-title {
  font-size: 16px;
  font-weight: 700;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  border: 1px solid var(--border);
  background: #17233f;
  color: #cfe0ff;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 12px;
  cursor: pointer;
}

.chip.active {
  border-color: var(--accent);
  background: #22437d;
  color: #fff;
}

.btn-small {
  margin-top: 10px;
  padding: 4px 8px;
  font-size: 12px;
}

.index-panel {
  position: sticky;
  top: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: #101a2f;
}

.index-panel .filter-title {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}

.index-panel h3 {
  margin: 14px 0 8px;
  font-size: 14px;
  color: #c9d7ff;
}

.btn-small {
  font-size: 12px;
  padding: 4px 8px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  border: 1px solid var(--border);
  background: #162544;
  color: #d7e2ff;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
}

.chip.active {
  border-color: #6ea8ff;
  background: #214a86;
  color: #fff;
}

@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }

  .index-panel {
    position: static;
    order: -1;
  }
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding: 16px 0 30px;
}

@media (max-width: 980px) {
  .posts-grid {
    grid-template-columns: 1fr;
  }

  .index-panel {
    position: static;
  }
}