:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --link: #0a66c2;
  --border: rgba(0, 0, 0, 0.08);
  --tab-bg: rgba(255, 255, 255, 0.85);
  --row-hover: rgba(0, 0, 0, 0.03);
  --accent: #0a66c2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #ededed;
    --muted: #8a8a8a;
    --link: #4ea1ff;
    --border: rgba(255, 255, 255, 0.10);
    --tab-bg: rgba(0, 0, 0, 0.75);
    --row-hover: rgba(255, 255, 255, 0.04);
    --accent: #4ea1ff;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--link); text-decoration: none; }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 12px 12px 80px;
}

/* Tabs */
.tabs {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 4px;
  padding: 8px 12px;
  background: var(--tab-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }

.tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 6px 14px;
  border-radius: 18px;
  color: var(--fg);
  font-size: 15px;
  font-weight: 500;
  border: 1px solid var(--border);
}
.tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Page title */
.page-title {
  font-size: 22px;
  font-weight: 600;
  margin: 14px 4px 8px;
}

/* Article list */
.article-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.article-row {
  border-bottom: 1px solid var(--border);
}
.article-link {
  display: block;
  padding: 14px 8px;
  min-height: 56px;
  color: var(--fg);
}
.article-link:active { background: var(--row-hover); }
.article-title {
  font-size: 17px;
  line-height: 1.4;
  font-weight: 500;
}
.article-meta {
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.meta-section {
  display: inline-block;
  padding: 1px 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 12px;
}

/* Article page */
.article-headline {
  font-size: 26px;
  line-height: 1.3;
  font-weight: 700;
  margin: 18px 0 10px;
}
.article-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 18px;
}
.article-body {
  font-size: 17px;
  line-height: 1.75;
}
.article-body p { margin: 0 0 1em; }
.article-body h2 { font-size: 20px; margin: 1.4em 0 0.4em; }
.article-body h3 { font-size: 18px; margin: 1.2em 0 0.4em; }
.article-body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1em auto;
  border-radius: 6px;
}
.article-original {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 14px;
}

.empty {
  color: var(--muted);
  padding: 40px 8px;
  text-align: center;
}