[hidden] { display: none !important; }
:root {
  --green: #2e7d6b; --dark: #1e5a4d; --tint: #eef6f3; --line: #d6e6e0;
  --warm: #e8704f; --warm-tint: #fdeee9; --red: #d64545; --amber: #f2b33d;
  --text: #1f2a2e; --muted: #6b7a7f; --bg: #f6f8f7;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: "Microsoft YaHei", "PingFang SC", sans-serif; color: var(--text); background: var(--bg); font-size: 15px; line-height: 1.6; }
a { color: var(--green); text-decoration: none; }
button { font: inherit; cursor: pointer; }
.topbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 24px; padding: 0 28px; height: 58px; background: var(--dark); color: #fff; }
.brand { color: #fff; font-weight: 700; font-size: 17px; white-space: nowrap; }
#nav { display: flex; gap: 4px; flex: 1; align-items: center; }
#nav a { color: #cfe6de; padding: 6px 12px; border-radius: 6px; }
#nav a.on, #nav a:hover { background: rgba(255,255,255,.12); color: #fff; }
#nav .user { margin-left: auto; color: #cfe6de; font-size: 14px; }
#nav .user button { margin-left: 8px; background: none; border: 1px solid #6fa898; color: #cfe6de; border-radius: 5px; padding: 2px 10px; }
main { max-width: 1240px; margin: 0 auto; padding: 28px; min-height: calc(100vh - 110px); }
.foot { text-align: center; color: var(--muted); font-size: 12px; padding: 14px; }
h1 { font-size: 26px; margin: 0 0 6px; color: var(--dark); }
h2 { font-size: 19px; margin: 0 0 12px; color: var(--dark); }
.sub { color: var(--muted); margin: 0 0 22px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 22px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.btn { display: inline-block; border: none; border-radius: 8px; padding: 9px 20px; background: var(--green); color: #fff; font-weight: 600; }
.btn:hover { background: var(--dark); }
.btn.ghost { background: #fff; color: var(--green); border: 1px solid var(--green); }
.btn.warm { background: var(--warm); }
.btn:disabled { background: #b9c6c2; cursor: not-allowed; border-color: #b9c6c2; color: #fff; }
.btn.sm { padding: 5px 12px; font-size: 13px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.tag { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 10px; background: var(--tint); color: var(--green); white-space: nowrap; }
.tag.done { background: var(--green); color: #fff; }
.tag.warn { background: var(--warm-tint); color: var(--warm); }
.tag.bad { background: #fbe3e3; color: var(--red); }
.bar { height: 8px; background: var(--tint); border-radius: 4px; overflow: hidden; margin: 10px 0; }
.bar > i { display: block; height: 100%; background: var(--green); }
.muted { color: var(--muted); font-size: 13px; }
input[type=text], textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; font: inherit; }
textarea { min-height: 150px; resize: vertical; }
label.field { display: block; margin-bottom: 14px; }
label.field span { display: block; font-weight: 600; margin-bottom: 4px; }
.login { max-width: 460px; margin: 50px auto; }
.lvl h2 { display: flex; justify-content: space-between; align-items: center; }
.lvl .stats { display: flex; gap: 18px; margin: 10px 0 16px; }
.lvl .stats b { display: block; font-size: 22px; color: var(--dark); }
/* 课程列表 */
.module { margin-bottom: 18px; }
.module h3 { margin: 0; padding: 12px 18px; background: var(--tint); border-radius: 10px 10px 0 0; font-size: 16px; color: var(--dark); display: flex; justify-content: space-between; }
.lessons { border: 1px solid var(--line); border-top: none; border-radius: 0 0 10px 10px; background: #fff; }
.lessons a { display: grid; grid-template-columns: 80px 1fr 110px 120px; gap: 12px; padding: 11px 18px; border-top: 1px solid var(--line); color: var(--text); align-items: center; }
.lessons a:first-child { border-top: none; }
.lessons a:hover { background: #fafcfb; }
.lessons .id { color: var(--muted); font-size: 13px; }
/* 课时播放器 */
.player { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 20px; }
.stage { background: #000; border-radius: 10px; overflow: hidden; aspect-ratio: 16 / 9; position: relative; }
.stage img { width: 100%; height: 100%; object-fit: contain; display: block; background: #fff; }
.stage .fallback { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: var(--dark); color: #fff; font-size: 28px; padding: 40px; text-align: center; }
.controls { display: flex; align-items: center; gap: 10px; margin: 12px 0; }
.controls .count { margin: 0 auto 0 8px; color: var(--muted); }
.thumbs { display: flex; gap: 6px; overflow-x: auto; padding-bottom: 6px; }
.thumbs button { flex: 0 0 auto; width: 34px; height: 28px; border: 1px solid var(--line); background: #fff; border-radius: 5px; font-size: 12px; }
.thumbs button.seen { background: var(--tint); }
.thumbs button.on { background: var(--green); color: #fff; border-color: var(--green); }
.side { display: flex; flex-direction: column; gap: 14px; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); }
.tabs button { background: none; border: none; padding: 8px 12px; color: var(--muted); border-bottom: 2px solid transparent; }
.tabs button.on { color: var(--green); border-bottom-color: var(--green); font-weight: 600; }
.script { max-height: 460px; overflow-y: auto; font-size: 14px; }
.script p { margin: 0 0 10px; padding: 8px 10px; border-radius: 6px; cursor: pointer; }
.script p b { display: block; color: var(--dark); font-size: 13px; }
.script p.on { background: var(--warm-tint); }
.notice { padding: 10px 14px; background: var(--warm-tint); border-radius: 8px; font-size: 13px; color: #8a3b24; }
/* 题目 */
.q { padding: 16px 0; border-top: 1px solid var(--line); }
.q:first-child { border-top: none; }
.q .stem { font-weight: 600; margin-bottom: 8px; }
.q .stem .type { font-weight: normal; margin-right: 6px; }
.opt { display: flex; gap: 8px; padding: 6px 10px; border-radius: 6px; cursor: pointer; align-items: flex-start; }
.opt:hover { background: #f4f8f6; }
.opt input { margin-top: 5px; }
.opt.right { background: #e3f3ec; }
.opt.wrong { background: #fbe3e3; }
.explain { margin-top: 8px; padding: 8px 12px; background: var(--tint); border-radius: 6px; font-size: 14px; }
/* 考试 */
.exam { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 20px; align-items: start; }
.sheet { position: sticky; top: 76px; }
.timer { font-size: 28px; font-weight: 700; color: var(--dark); text-align: center; margin-bottom: 10px; }
.timer.low { color: var(--red); }
.dots { display: grid; grid-template-columns: repeat(8, 1fr); gap: 4px; margin: 10px 0 14px; max-height: 340px; overflow-y: auto; }
.dots a { display: block; text-align: center; font-size: 11px; padding: 3px 0; border: 1px solid var(--line); border-radius: 4px; color: var(--muted); }
.dots a.ok { background: var(--green); border-color: var(--green); color: #fff; }
.section-title { margin: 22px 0 4px; padding: 8px 14px; background: var(--tint); border-radius: 8px; font-weight: 700; color: var(--dark); }
.score-big { font-size: 56px; font-weight: 800; line-height: 1; }
.score-big.pass { color: var(--green); }
.score-big.fail { color: var(--red); }
table.t { width: 100%; border-collapse: collapse; font-size: 14px; }
table.t th, table.t td { border-bottom: 1px solid var(--line); padding: 8px 10px; text-align: left; }
table.t th { background: var(--tint); color: var(--dark); }
.rubric label { display: flex; gap: 8px; padding: 6px 0; align-items: flex-start; }
.rubric input { margin-top: 5px; }
.answer-box { white-space: pre-wrap; background: #fafcfb; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; min-height: 60px; }
/* 证书 */
.cert-wrap { text-align: center; }
.cert-wrap canvas { width: 100%; max-width: 1000px; border: 1px solid var(--line); box-shadow: 0 6px 24px rgba(0,0,0,.08); background: #fff; }
@media print {
  .topbar, .foot, .no-print { display: none !important; }
  main { padding: 0; max-width: none; }
  .cert-wrap canvas { border: none; box-shadow: none; max-width: none; }
}
@media (max-width: 900px) {
  .grid2, .player, .exam { grid-template-columns: 1fr; }
  .lessons a { grid-template-columns: 70px 1fr; }
  .lessons a .hide-sm { display: none; }
  .sheet { position: static; }
}
/* 正式版补充 */
.saving { font-size: 12px; color: var(--muted); text-align: center; margin-top: 6px; }
.err { color: var(--red); font-size: 13px; margin: 8px 0; }
.pill { display: inline-block; padding: 2px 10px; border-radius: 12px; background: var(--tint); color: var(--green); font-size: 13px; }
.admin-tabs { display: flex; gap: 6px; margin-bottom: 18px; flex-wrap: wrap; }
.admin-tabs a { padding: 7px 16px; border-radius: 8px; background: #fff; border: 1px solid var(--line); color: var(--text); }
.admin-tabs a.on { background: var(--green); border-color: var(--green); color: #fff; }
.kpi { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 18px; }
.kpi div { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.kpi b { display: block; font-size: 26px; color: var(--dark); }
select { font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.mono { font-family: Consolas, monospace; }

/* 只读演示管理员：隐藏修改类操作 */
.readonly #addBtn, .readonly #impBtn, .readonly [data-reset], .readonly [data-tog], .readonly #saveLv,
.readonly #issue, .readonly #all, .readonly .ck, .readonly #submit { display: none !important; }