:root {
  --bg: #0e1417;
  --panel: #151d21;
  --panel-2: #1c262b;
  --line: #26333a;
  --ink: #e6eef1;
  --ink-2: #93a5ad;
  --ink-3: #6b7d85;
  --accent: #2f9e8f;
  --accent-ink: #0b1512;
  --ok: #46b17f;
  --bad: #d9603f;
  --warn: #d0a03c;
  --radius: 6px;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

body.stale::after {
  content: "连接断了，正在重连…";
  position: fixed;
  inset: auto 0 0 0;
  background: var(--bad);
  color: #fff;
  text-align: center;
  padding: 6px;
  font-size: 14px;
  z-index: 99;
}

h1, h2, h3, h4 { margin: 0 0 .4em; font-weight: 700; }
h1 { font-size: 1.4rem; }
h2 { font-size: 1.1rem; }
h3 { font-size: 1rem; margin-top: 1.4em; }
code { font-family: var(--mono); font-size: .86em; color: var(--ink-2); }
a { color: var(--accent); }

button, .btn {
  font: inherit;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  padding: .45em 1em;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
button:hover, .btn:hover { border-color: var(--accent); }
button:disabled { opacity: .38; cursor: not-allowed; border-color: var(--line); }
.btn { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); font-weight: 400; }
.btn.danger { background: var(--bad); border-color: var(--bad); color: #fff; }
.btn.danger.ghost { background: transparent; color: var(--bad); }
.sm, .btn.sm { padding: .2em .6em; font-size: .86rem; }
button.on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

input[type="text"], input:not([type]), input[type="password"], input[type="file"] {
  font: inherit;
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--ink);
  padding: .4em .6em;
  border-radius: var(--radius);
  width: 100%;
}
input:focus { border-color: var(--accent); outline: none; }

.row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin: .8rem 0; }
.spacer { flex: 1; }
.msg { color: var(--ink-2); font-size: .9rem; margin: .5rem 0; }
.msg.bad { color: var(--bad); }
.msg.ok { color: var(--ok); }
.msg.warn { color: var(--warn); }
.mid { text-align: center; }
.ell { max-width: 28rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- 入口 ---------- */
.gate { max-width: 26rem; margin: 12vh auto; padding: 2rem; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; text-align: center; }
.gate .sub { color: var(--ink-2); margin-top: -.2rem; }
.gate form { display: grid; gap: .6rem; margin-top: 1.2rem; }

/* ---------- 选手端 ---------- */
.bar { display: flex; gap: 1rem; align-items: center; padding: .6rem 1rem; background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.bar .who { font-weight: 600; }
.bar .clock { font-family: var(--mono); font-size: 1.5rem; font-variant-numeric: tabular-nums; color: var(--accent); }
.bar .prog, .bar .score { color: var(--ink-2); font-size: .92rem; }
.bar b { color: var(--ink); font-size: 1.05rem; }
.bar .spacer, .bar > :last-child { margin-left: auto; }

.banner { background: var(--warn); color: #1a1206; text-align: center; padding: .4rem; font-weight: 600; }

.nav { display: flex; flex-wrap: wrap; gap: .3rem; padding: .6rem 1rem; background: var(--panel); border-bottom: 1px solid var(--line); }
.qbtn { width: 2.2rem; padding: .25em 0; text-align: center; font-family: var(--mono); }
.qbtn.done { border-color: var(--ok); color: var(--ok); }
.qbtn.on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

.work { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 1rem; padding: 1rem; align-items: start; }
@media (max-width: 900px) { .work { grid-template-columns: 1fr; } }

.doc { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: .6rem; position: sticky; top: 8.5rem; }
.doc-tools { display: flex; gap: .4rem; align-items: center; margin-bottom: .5rem; }
.imgtabs { display: flex; gap: .3rem; }
.zval { font-family: var(--mono); font-size: .85rem; color: var(--ink-2); min-width: 3.2rem; text-align: center; }
.doc-view { overflow: hidden; background: #000; border-radius: 6px; height: 62vh; display: grid; place-items: center; cursor: grab; touch-action: none; }
.doc-view:active { cursor: grabbing; }
.doc-view img { max-width: 100%; max-height: 100%; transform-origin: center; user-select: none; }
.doc .tip { color: var(--ink-3); font-size: .82rem; margin: .4rem 0 0; }

.form { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 1rem; }
.form-head { display: flex; align-items: center; gap: .6rem; }
.tag.done { background: var(--ok); color: #08150f; padding: .1em .6em; border-radius: 4px; font-size: .8rem; }
.prompt { background: var(--panel-2); border-left: 3px solid var(--accent); padding: .4rem .7rem; border-radius: 4px; }
.hint { color: var(--ink-2); font-size: .88rem; }
fieldset { border: 1px solid var(--line); border-radius: 6px; padding: .8rem; margin: .8rem 0; }
fieldset[disabled] { opacity: .6; }
legend { color: var(--ink-2); font-size: .85rem; padding: 0 .4em; }
.field { display: grid; gap: .2rem; margin-bottom: .7rem; }
.field .lab { font-size: .85rem; color: var(--ink-2); }
.field .fhint { font-size: .76rem; color: var(--ink-3); }
.field .inline { display: flex; gap: .4rem; align-items: center; }
.form-foot { display: flex; gap: .6rem; align-items: center; }
.saved { font-size: .82rem; color: var(--ink-3); flex: 1; }
.saved.ok { color: var(--ok); }
.saved.bad { color: var(--bad); }
.saved.wait { color: var(--warn); }

/* ---------- 大屏 ---------- */
.display-page { padding: 1.5rem; }
.dbar { display: flex; align-items: baseline; gap: 1.5rem; margin-bottom: 1.2rem; }
.dbar h1 { font-size: 1.8rem; }
.dclock { font-family: var(--mono); font-size: 3rem; color: var(--accent); font-variant-numeric: tabular-nums; }
.dstatus { color: var(--ink-2); font-size: 1.1rem; margin-left: auto; }
.booths { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: .9rem; }
.booth { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: .8rem 1rem; }
.booth.top { border-color: var(--accent); }
.booth.submitted { opacity: .72; }
.bno { font-family: var(--mono); color: var(--ink-3); font-size: .85rem; }
.bname { font-size: 1.25rem; font-weight: 700; margin-bottom: .4rem; }
.bbar { height: 8px; background: var(--panel-2); border-radius: 4px; overflow: hidden; }
.bbar i { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.bmeta { display: flex; justify-content: space-between; margin-top: .4rem; color: var(--ink-2); font-family: var(--mono); }
.bscore { color: var(--ink); font-size: 1.3rem; font-weight: 700; }
.bflag { margin-top: .3rem; font-size: .8rem; color: var(--ok); }
.bflag.warn { color: var(--warn); }
.final { margin-top: 1.5rem; background: var(--panel); border: 1px solid var(--accent); border-radius: 8px; padding: 1rem 1.4rem; }
.final ol { margin: 0; padding-left: 1.4rem; }
.final li { display: grid; grid-template-columns: 1fr auto auto; gap: 1rem; align-items: baseline; padding: .3rem 0; border-bottom: 1px solid var(--line); }
.fname { font-size: 1.2rem; font-weight: 600; }
.fdetail { color: var(--ink-3); font-family: var(--mono); font-size: .85rem; }
.fscore { font-size: 1.4rem; font-weight: 700; color: var(--accent); font-family: var(--mono); }

/* ---------- 后台 ---------- */
.admin-page { padding: 0 0 3rem; }
.abar { display: flex; gap: 1rem; align-items: center; padding: .6rem 1.2rem; background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.abar h1 { font-size: 1.1rem; margin: 0; }
.tabs { display: flex; gap: .3rem; }
.abar > :last-child { margin-left: auto; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 1rem 1.2rem; margin: 1rem 1.2rem; }
.cstat { display: flex; gap: 2rem; flex-wrap: wrap; }
.cstat .k { display: block; color: var(--ink-3); font-size: .8rem; }
.cstat b { font-size: 1.5rem; font-family: var(--mono); }

table.grid { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.grid caption { text-align: left; color: var(--ink-2); font-size: .85rem; padding: .8rem 0 .3rem; }
table.grid th { text-align: left; font-size: .78rem; color: var(--ink-3); font-weight: 600; border-bottom: 1px solid var(--line); padding: .4rem .5rem; white-space: nowrap; }
table.grid td { padding: .35rem .5rem; border-bottom: 1px solid var(--line); vertical-align: middle; }
table.grid tr.bad td { background: rgba(217, 96, 63, .12); }
table.grid tr.wrong td { color: var(--bad); }
table.grid tr.voided td { opacity: .5; text-decoration: line-through; }
table.grid.sm { font-size: .84rem; }
table.fields input { min-width: 8rem; }
.acts { display: flex; gap: .3rem; }

.qgrid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.5rem; }
@media (max-width: 900px) { .qgrid { grid-template-columns: 1fr; } }
.imgs { display: flex; gap: .6rem; flex-wrap: wrap; margin-bottom: .6rem; }
.imgs figure { margin: 0; position: relative; }
.imgs img { max-width: 12rem; border-radius: 6px; border: 1px solid var(--line); display: block; }
.imgs button { position: absolute; top: .3rem; right: .3rem; }
.mrzbox { background: var(--panel-2); border: 1px solid var(--line); border-radius: 6px; padding: .7rem; margin-top: .8rem; }
.checks { list-style: none; margin: .4rem 0 0; padding: 0; font-family: var(--mono); font-size: .84rem; }
.checks .ok { color: var(--ok); }
.checks .bad { color: var(--bad); }
.qdetail { border: 1px solid var(--line); border-radius: 6px; padding: .5rem .8rem; margin-bottom: .5rem; }
.qdetail summary { cursor: pointer; }
.formula { background: var(--panel-2); border: 1px solid var(--line); border-radius: 6px; padding: .8rem; font-family: var(--mono); font-size: .85rem; overflow-x: auto; }