:root {
  --ink: #1f2933; --muted: #5f6b7a; --line: #d9dee5; --bg: #f6f7f9; --card: #ffffff;
  --accent: #1d5fa8; --accent-soft: #e8f0fa; --ok: #1f7a4d; --warn: #a15c00;
}
* { box-sizing: border-box; }
html { font-size: 16px; }
body {
  margin: 0; color: var(--ink); background: var(--bg);
  font-family: "Segoe UI", "Source Han Sans CN", "Noto Sans CJK SC", "PingFang SC", sans-serif;
  line-height: 1.65; font-style: normal;
}
.top { background: var(--card); border-bottom: 1px solid var(--line); }
.wrap { max-width: 860px; margin: 0 auto; padding: 14px 18px; }
.wrap.wide { max-width: 1180px; }
.top .wrap { display: flex; justify-content: space-between; align-items: center; }
.brand { font-weight: 700; font-size: 1.05rem; }
.who { color: var(--muted); font-size: .9rem; }
h1 { font-size: 1.5rem; margin: 18px 0 6px; }
h2 { font-size: 1.2rem; margin: 22px 0 8px; }
h3 { font-size: 1.05rem; margin: 16px 0 6px; }
p { margin: 8px 0; }
.muted { color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; margin: 14px 0; }
.card.soft { background: var(--accent-soft); border-color: #c5d8ef; }
label { display: block; margin: 6px 0; cursor: pointer; }
input[type=text], input[type=password], textarea {
  width: 100%; font: inherit; padding: 10px 12px; border: 1px solid #b9c2cd; border-radius: 8px; background: #fff; color: var(--ink);
}
textarea { min-height: 220px; resize: vertical; line-height: 1.6; }
textarea.en, input.en { font-family: "Segoe UI", "Source Han Sans CN", "Noto Sans CJK SC", sans-serif; font-size: 1.05rem; }
input[type=radio], input[type=checkbox] { margin-right: 8px; transform: scale(1.15); }
button {
  font: inherit; padding: 9px 18px; border-radius: 8px; border: 1px solid var(--accent); background: var(--accent); color: #fff; cursor: pointer;
}
button.ghost { background: #fff; color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.chip { background: #fff; border: 1px solid #aab7c6; border-radius: 999px; padding: 3px 14px; font-size: 1.05rem; }
.bubble { background: #eef1f5; border-radius: 12px; padding: 10px 14px; display: inline-block; max-width: 100%; }
.status { display: flex; justify-content: space-between; align-items: center; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; margin: 8px 0; background: #fff; }
.tag { font-size: .85rem; padding: 2px 10px; border-radius: 999px; background: #eef1f5; color: var(--muted); }
.tag.done { background: #dff3e8; color: var(--ok); }
.timer { font-variant-numeric: tabular-nums; color: var(--muted); }
.count { color: var(--muted); font-size: .9rem; }
.prompt { background: #fbfbfc; border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; }
.prompt ul { margin: 6px 0 0 18px; padding: 0; }
.peer { border-left: 3px solid var(--accent); padding: 4px 12px; margin: 10px 0; background: #fbfbfc; }
.peer b { display: block; font-size: .9rem; color: var(--muted); }
.msg { color: var(--warn); min-height: 1.4em; }
.ok { color: var(--ok); }
table { border-collapse: collapse; width: 100%; }
th, td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; vertical-align: top; }
th { background: #eef1f5; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 800px) { .grid2 { grid-template-columns: 1fr; } }
.good { background: #e6f5ec; }
.bad { background: #fdeceb; }
.mid { background: #fff5dc; }
pre.text { white-space: pre-wrap; font: inherit; margin: 0; }
.taglist label { display: inline-block; margin: 3px 12px 3px 0; }

.sentence { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 8px 0 14px; font-size: 1.1rem; }
.sentence .speaker { color: var(--muted); }
.sentence .fixed { font-weight: 600; }
.slot { min-width: 84px; min-height: 40px; padding: 4px 12px; border: 2px dashed #9fb0c3; background: #fff; color: var(--ink); border-radius: 8px; font: inherit; cursor: pointer; }
.slot.filled { border-style: solid; border-color: var(--accent); background: var(--accent-soft); }
.chip { background: #fff; color: var(--ink); border: 1px solid #aab7c6; border-radius: 999px; padding: 6px 16px; font: inherit; font-size: 1.05rem; cursor: pointer; }
.chip.used { opacity: .3; cursor: default; }
.timer.urgent { color: #b42318; font-weight: 700; }

/* 题目在左固定、作答在右（宽屏）；窄屏上下排列 */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; align-items: start; }
.split .pin { position: sticky; top: 12px; max-height: calc(100vh - 24px); overflow-y: auto; }
.split .work .card:first-child { margin-top: 0; }
.split textarea { min-height: 380px; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } .split .pin { position: static; max-height: none; } .split textarea { min-height: 260px; } }