:root {
  --ink: #16202e;
  --muted: #66707f;
  --line: #e3e7ee;
  --bg: #f6f7f9;
  --card: #fff;
  --blue: #1b5fd9;
  --blue-soft: #eaf1fd;
  --navy: #0f2f5b;
  --red: #c62828;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
        "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

.wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; }

.masthead {
  background: var(--navy);
  color: #fff;
  padding: 30px 0 22px;
  border-bottom: 3px solid var(--red);
}
.masthead h1 { margin: 0 0 6px; font-size: 27px; letter-spacing: -.02em; font-weight: 650; }
.lede { margin: 0 0 12px; color: #c3cfdf; font-size: 14.5px; max-width: 640px; }
.stats { margin: 0; font-size: 12.5px; color: #92a6c0; font-variant-numeric: tabular-nums; }

.tabs {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding: 10px 20px;
  background: rgba(246, 247, 249, .94);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tabs button {
  flex: 0 0 auto;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 13.5px;
  padding: 6px 11px;
  border-radius: 999px;
  cursor: pointer;
}
.tabs button:hover { background: #eceff4; color: var(--ink); }
.tabs button.on {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
.tabs .n { opacity: .7; font-size: 11.5px; margin-left: 4px; }

.toolbar { display: flex; align-items: center; gap: 12px; margin: 18px 0 10px; }
#q {
  flex: 1;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--card);
  font: inherit;
  font-size: 14px;
  color: var(--ink);
  outline: none;
}
#q:focus { border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-soft); }
.count { font-size: 12.5px; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }

.list { list-style: none; margin: 0; padding: 0; }

.item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 11px;
  margin-bottom: 8px;
  overflow: hidden;
}
.item > .row {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 4px;
  padding: 11px 14px 11px 8px;
  cursor: pointer;
  align-items: start;
}
.item > .row:hover { background: #fafbfd; }
.rank {
  color: #a6b0bd;
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
  text-align: right;
  padding-top: 2px;
}
.name {
  font-weight: 560;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  word-break: break-word;
}
.name:hover { color: var(--blue); }
.meta { margin-top: 3px; font-size: 12.5px; color: var(--muted); font-variant-numeric: tabular-nums; }
.meta b { color: var(--blue); font-weight: 620; }
.meta .dot { margin: 0 5px; opacity: .5; }

.ev { display: none; border-top: 1px solid var(--line); background: #fcfdfe; padding: 10px 14px 12px 50px; }
.item.open .ev { display: block; }
.ev h4 { margin: 0 0 6px; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); font-weight: 600; }
.ev ul { margin: 0; padding: 0; list-style: none; }
.ev li { font-size: 13px; padding: 4px 0; color: #3b4657; }
.ev li a { color: var(--blue); text-decoration: none; }
.ev li a:hover { text-decoration: underline; }
.ev .by { color: var(--ink); font-weight: 560; }
.ev .tag {
  display: inline-block;
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--blue-soft);
  color: var(--blue);
  margin-right: 6px;
}
.ev .tag.c { background: #fdecec; color: var(--red); }

.foot { margin: 22px 0 60px; font-size: 12.5px; color: var(--muted); }
.foot a { color: var(--blue); }

.empty { padding: 40px 0; text-align: center; color: var(--muted); font-size: 14px; }

@media (max-width: 560px) {
  .masthead h1 { font-size: 23px; }
  .lede { font-size: 13.5px; }
  .item > .row { grid-template-columns: 30px 1fr; padding: 10px 12px 10px 6px; }
  .ev { padding-left: 44px; }
}

.masthead h1 a { color: inherit; text-decoration: none; }

.prose { padding-top: 26px; padding-bottom: 70px; max-width: 720px; }
.prose h2 {
  font-size: 16px;
  margin: 30px 0 8px;
  padding-left: 10px;
  border-left: 3px solid var(--red);
  line-height: 1.2;
}
.prose p, .prose li { font-size: 14.5px; color: #2c3644; }
.prose ul, .prose ol { padding-left: 20px; }
.prose li { margin: 5px 0; }
.prose code {
  background: #eef1f6;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 12.5px;
}
.prose a { color: var(--blue); }
.prose .back { margin-top: 34px; font-size: 13.5px; }

.note {
  margin: 0 0 10px;
  padding: 7px 11px;
  background: #fff7e6;
  border: 1px solid #f0dcae;
  border-radius: 8px;
  font-size: 12.5px;
  color: #7a5c14;
}

.topline { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.lang { display: flex; gap: 4px; flex: 0 0 auto; }
.lang button {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18);
  color: #c3cfdf;
  font: inherit;
  font-size: 12px;
  padding: 3px 9px;
  border-radius: 999px;
  cursor: pointer;
}
.lang button:hover { color: #fff; border-color: rgba(255,255,255,.4); }
.lang button.on { background: #fff; color: var(--navy); border-color: #fff; font-weight: 600; }

.intro {
  margin: 18px 0 6px;
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  border-radius: 9px;
}
.intro p { margin: 0 0 8px; font-size: 13.5px; color: #33404f; line-height: 1.6; }
.intro p:last-child { margin-bottom: 0; }

.morebtn {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 8px 16px;
  font: inherit;
  color: var(--blue);
  cursor: pointer;
}
.morebtn:hover { background: var(--blue-soft); }