:root {
  --bg: #f4f6f9; --card: #fff; --text: #1f2937; --muted: #6b7280; --line: #e5e7eb;
  --primary: #2563eb; --primary-d: #1d4ed8; --ok: #15803d; --err: #b91c1c; --warn: #a16207;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.6 -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: Consolas, "Courier New", monospace; background: #f1f5f9; padding: 1px 5px; border-radius: 4px; font-size: .92em; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
.topbar { background: #1e3a8a; color: #fff; }
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; height: 54px; }
.topbar .brand { color: #fff; font-weight: 600; font-size: 17px; }
.topbar nav { display: flex; gap: 18px; align-items: center; }
.topbar nav a, .topbar nav span { color: #dbeafe; }
main { padding: 20px 16px 60px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 18px 22px; margin-bottom: 18px; }
.card.narrow { max-width: 420px; margin: 40px auto; }
h2 { margin: 0 0 10px; font-size: 21px; }
h3 { margin: 0 0 12px; font-size: 17px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 16px 0; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.ok-text { color: var(--ok); }
.err-text { color: var(--err); }
.desc { white-space: pre-wrap; background: #f8fafc; border-left: 3px solid var(--primary); padding: 8px 12px; margin: 8px 0; }

.form { display: flex; flex-direction: column; gap: 12px; }
.form label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; color: #374151; }
.form label.check, label.check { flex-direction: row; align-items: center; gap: 6px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 18px; }
.grid2 .full, .grid2 .check { grid-column: 1 / -1; }
input, select, textarea { font: inherit; padding: 7px 10px; border: 1px solid #cbd5e1; border-radius: 6px; background: #fff; }
input[type=checkbox], input[type=radio] { padding: 0; }
input[type=file] { border: 1px dashed #94a3b8; padding: 6px; }
textarea { resize: vertical; font-family: Consolas, monospace; }
.row { display: flex; gap: 10px; align-items: center; margin: 10px 0; }
.row input[name=name] { flex: 1; }
.wrap-row { flex-wrap: wrap; }
.inline { display: inline; }

.btn { display: inline-block; padding: 7px 16px; border-radius: 6px; border: 1px solid #cbd5e1; background: #fff;
  color: var(--text); cursor: pointer; font: inherit; font-size: 14px; }
.btn:hover { background: #f1f5f9; text-decoration: none; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-d); }
.btn.danger { background: #fff; border-color: var(--err); color: var(--err); }
.btn:disabled { opacity: .6; cursor: wait; }
button.link { background: none; border: 0; color: var(--primary); cursor: pointer; font: inherit; padding: 0; }
button.link.danger { color: var(--err); }

.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; border: 1px solid; }
.flash.ok { background: #f0fdf4; border-color: #bbf7d0; color: var(--ok); }
.flash.err { background: #fef2f2; border-color: #fecaca; color: var(--err); }
.flash.warn { background: #fffbeb; border-color: #fde68a; color: var(--warn); }
.flash ul { margin: 4px 0 0; padding-left: 20px; }

.tag { font-size: 12px; font-weight: normal; padding: 2px 8px; border-radius: 10px; background: #e0e7ff; color: #3730a3; vertical-align: middle; }
.tag.green { background: #dcfce7; color: var(--ok); }
.tag.gray { background: #e5e7eb; color: #4b5563; }

.scroll { overflow-x: auto; }
.scroll.tall { max-height: 420px; overflow-y: auto; }
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th, .tbl td { border-bottom: 1px solid var(--line); padding: 7px 10px; text-align: left; white-space: nowrap; }
.tbl th { background: #f8fafc; font-weight: 600; color: #374151; }
.tbl tr.hl td { background: #eff6ff; }
.rank td, .rank th { text-align: center; }

.tabs { display: flex; gap: 20px; margin-bottom: 8px; }
.preview ul { list-style: none; padding: 0; margin: 10px 0 4px; }
#submit-btn { margin-top: 12px; }

.verdict { font-size: 13px; padding: 2px 8px; border-radius: 4px; margin: 0 6px; font-weight: normal; }
.v-AC { background: #dcfce7; color: var(--ok); }
.v-WA { background: #fee2e2; color: var(--err); }
.v-TLE, .v-MLE, .v-OLE { background: #fef3c7; color: var(--warn); }
.v-RE { background: #f3e8ff; color: #7e22ce; }
.v-CE, .v-SE { background: #e0e7ff; color: #3730a3; }
.v-NS { background: #f1f5f9; color: var(--muted); }
a.score { display: inline-block; min-width: 40px; padding: 1px 6px; border-radius: 4px; }

.cases { display: grid; grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); gap: 8px; margin: 10px 0; }
.case { border-radius: 6px; padding: 6px 8px; font-size: 12px; line-height: 1.4; }
.case .ci { opacity: .7; }
.case .cv { font-weight: 700; font-size: 15px; }
pre.msg, pre.code { background: #0f172a; color: #e2e8f0; padding: 12px; border-radius: 6px; overflow: auto; max-height: 420px; font-size: 13px; }
details summary { cursor: pointer; color: var(--primary); margin: 6px 0; }

@media (max-width: 700px) {
  .grid2 { grid-template-columns: 1fr; }
  .row { flex-wrap: wrap; }
  .topbar nav { gap: 10px; font-size: 13px; }
}