:root {
  --bg: #fbfaf8; --fg: #1d1d1f; --muted: #6b6b70; --line: #e4e2dd; --card: #ffffff;
  --main: #eef6ee; --main-bar: #3d8b4a; --aband: #fcecea; --aband-bar: #c0453a;
  --accent: #2f5fb3; --chip: #f0efeb; --warn: #9a6a00;
  --post: #f1f1f3; --post-bar: #9a9aa2;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #17171a; --fg: #e9e9ec; --muted: #9a9aa2; --line: #2d2d33; --card: #1f1f23;
    --main: #1d2b20; --main-bar: #5fb26c; --aband: #33201e; --aband-bar: #e0736a;
    --accent: #7ea6ef; --chip: #2a2a30; --warn: #e2b04a;
    --post: #232328; --post-bar: #6b6b70;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.6 -apple-system, "Segoe UI", "PingFang SC", "Noto Sans SC", sans-serif; }
header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 20px;
  border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--bg); z-index: 5; flex-wrap: wrap; }
header .brand { font-weight: 650; color: var(--fg); text-decoration: none; }
header nav a { margin-left: 16px; color: var(--accent); text-decoration: none; }
main { max-width: 1100px; margin: 0 auto; padding: 20px 16px 80px; }
h1 { font-size: 22px; margin: 4px 0 12px; } h2 { font-size: 17px; margin: 24px 0 8px; }
.muted { color: var(--muted); } .small { font-size: 13px; }
.filters { display: flex; flex-wrap: wrap; gap: 8px 14px; margin: 8px 0 14px; align-items: center; }
.filters select, .filters input { background: var(--card); color: var(--fg); border: 1px solid var(--line); border-radius: 6px; padding: 4px 8px; font: inherit; }
table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); font-size: 14px; }
th { color: var(--muted); font-weight: 600; cursor: pointer; white-space: nowrap; }
tr:hover td { background: var(--chip); }
td a { color: var(--accent); text-decoration: none; font-family: var(--mono); font-size: 13px; }
.tablewrap { overflow-x: auto; }
.chip { display: inline-block; padding: 1px 7px; border-radius: 10px; background: var(--chip); font-size: 12px; margin-right: 4px; white-space: nowrap; }
.chip.ok { color: var(--main-bar); } .chip.bad { color: var(--aband-bar); } .chip.warn { color: var(--warn); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; margin: 12px 0; overflow-wrap: anywhere; }
.meta { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0 10px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 14px 0 8px; position: sticky; top: 52px; background: var(--bg); padding: 6px 0; z-index: 4; }
.toolbar button, .btn { background: var(--card); color: var(--fg); border: 1px solid var(--line); border-radius: 6px; padding: 5px 12px; font: inherit; cursor: pointer; }
.toolbar button.on { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.legend span { margin-right: 12px; font-size: 13px; }
.sw { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 4px; vertical-align: middle; }
.para { display: grid; grid-template-columns: 54px 1fr; gap: 10px; padding: 8px 10px 8px 0; border-left: 4px solid transparent; border-bottom: 1px solid var(--line); }
.para.M { background: var(--main); border-left-color: var(--main-bar); }
.para.A { background: var(--aband); border-left-color: var(--aband-bar); }
.para.P { background: var(--post); border-left-color: var(--post-bar); }
.para .pid { font-family: var(--mono); font-size: 12px; color: var(--muted); text-align: right; padding-top: 2px; }
.para .tags { margin-bottom: 3px; }
.para .text { white-space: pre-wrap; overflow-wrap: anywhere; }
.para.nodestart { border-top: 2px solid var(--line); }
.para .review { margin-top: 6px; display: flex; gap: 8px; align-items: center; font-size: 13px; }
.para .review label { cursor: pointer; user-select: none; }
.para.changed { outline: 2px dashed var(--accent); outline-offset: -2px; }
.answer { white-space: pre-wrap; }
.progress { height: 6px; background: var(--chip); border-radius: 3px; overflow: hidden; margin: 6px 0 12px; }
.progress > div { height: 100%; background: var(--accent); }
.katex-display { overflow-x: auto; overflow-y: hidden; }
@media (max-width: 640px) { .para { grid-template-columns: 34px 1fr; } header nav a { margin-left: 10px; } }

.langbtn { margin-left: 16px; background: var(--card); color: var(--accent); border: 1px solid var(--line); border-radius: 6px; padding: 2px 10px; font: inherit; cursor: pointer; }