/* 课堂作业互评系统 */
* { box-sizing: border-box; }
:root {
  --bg: #f2f5f7;
  --card: #ffffff;
  --line: #e3e8ec;
  --txt: #22313f;
  --muted: #7a8a99;
  --brand: #0e7a5f;
  --brand-dark: #0a5c48;
  --orange: #e07b1f;
  --red: #c94436;
  --blue: #2569c3;
  --radius: 10px;
}
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--txt);
  font: 15px/1.65 -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  min-height: 100vh; display: flex; flex-direction: column;
}
.wrap { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }
main.wrap { flex: 1; padding: 24px 0 48px; }

/* 顶栏 */
.topbar { background: var(--brand); color: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.12); }
.bar-inner { display: flex; align-items: center; gap: 18px; min-height: 52px; }
.brand { color: #fff; text-decoration: none; font-weight: 700; font-size: 17px; white-space: nowrap; }
.topbar nav { display: flex; gap: 4px; flex-wrap: wrap; }
.topbar nav a { color: #dff0ea; text-decoration: none; padding: 6px 10px; border-radius: 6px; font-size: 14px; }
.topbar nav a:hover { background: rgba(255,255,255,.14); color: #fff; }
.spacer { flex: 1; }
.who { font-size: 14px; color: #eaf6f1; white-space: nowrap; }
.who small { opacity: .75; margin-left: 6px; }

h1 { font-size: 22px; margin: 6px 0 16px; }
h3 { font-size: 16px; margin: 0 0 10px; }
a { color: var(--brand-dark); }
code { background: #eef3f0; padding: 2px 6px; border-radius: 5px; font-size: 13px; }
code.lan { font-size: 15px; user-select: all; }

/* 卡片 */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; margin-bottom: 16px;
}
.card.narrow { max-width: 560px; }
.card.empty { text-align: center; color: var(--muted); padding: 36px; }
.card-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.cards-row { display: flex; gap: 16px; margin-bottom: 16px; flex-wrap: wrap; }
.card.stat { flex: 1; min-width: 140px; text-align: center; }
.stat-n { font-size: 30px; font-weight: 700; color: var(--brand-dark); }

/* 表格 */
.tbl { width: 100%; border-collapse: collapse; font-size: 14px; }
.tbl th, .tbl td { padding: 9px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
.tbl th { color: var(--muted); font-weight: 600; font-size: 13px; white-space: nowrap; }
.tbl tbody tr:hover { background: #f7faf9; }
.tbl-scroll { overflow-x: auto; }
.row-flag { background: #fdf3e7; }
.row-flag:hover { background: #fbead2 !important; }

/* 表单 */
label { display: block; margin: 10px 0; font-size: 14px; color: var(--txt); }
input:not([type=file]):not([type=number]):not(.adj), textarea, input[type=number], input[type=datetime-local], input[type=text], input[type=password], select {
  width: 100%; padding: 8px 10px; margin-top: 4px; font: inherit;
  border: 1px solid #ccd6dd; border-radius: 7px; background: #fff;
}
input:focus, textarea:focus, select:focus { outline: 2px solid rgba(14,122,95,.25); border-color: var(--brand); }
textarea { resize: vertical; }
.submit-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin: 10px 0; }
.submit-row label { margin: 0; }
.submit-row input[name=id], .submit-row input[name=name] { width: 180px; margin-top: 0; }
.submit-row input[type=number] { width: 110px; margin-top: 0; }
.submit-row select, .submit-row input[name=newClassName] { width: auto; margin-top: 0; min-width: 160px; }
form.inline select { width: auto; margin: 0; padding: 4px 6px; max-width: 130px; }
input.rename-input { width: 150px !important; margin: 0 !important; padding: 4px 8px !important; }
.tabs-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 0 0 14px; align-items: center; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 640px) { .grid2 { grid-template-columns: 1fr; } }

/* 按钮 */
.btn {
  display: inline-block; border: 1px solid #c6d2cd; background: #fff; color: var(--txt);
  border-radius: 7px; padding: 7px 14px; font: inherit; font-size: 14px; cursor: pointer;
  text-decoration: none; line-height: 1.4; white-space: nowrap;
}
.btn:hover { border-color: var(--brand); color: var(--brand-dark); }
.btn-primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); color: #fff; }
.btn-orange { background: var(--orange); border-color: var(--orange); color: #fff; }
.btn-orange:hover { background: #c96a15; color: #fff; }
.btn-danger { color: var(--red); border-color: #e5c2bd; }
.btn-danger:hover { background: var(--red); color: #fff; border-color: var(--red); }
.btn-ghost { border-color: transparent; background: transparent; color: var(--brand-dark); }
.btn-ghost:hover { background: rgba(14,122,95,.08); }
.btn-sm { padding: 4px 10px; font-size: 13px; }
.btn-block { width: 100%; margin-top: 10px; }
.btn[disabled] { opacity: .55; cursor: wait; }
button { font: inherit; }

/* 徽章/标记 */
.badge { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 20px; vertical-align: middle; }
.b-green { background: #e0f2ea; color: #0e7a5f; }
.b-orange { background: #fbe9d7; color: #b36212; }
.b-gray { background: #e9edf1; color: #5c6b78; }
.b-blue { background: #e0ebfa; color: var(--blue); }
.b-red { background: #fbe3e0; color: var(--red); }
.ok { color: #0e7a5f; }
.err { color: var(--red); }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.center { text-align: center; }
.pre { white-space: pre-wrap; }
.mt { margin-top: 12px; }
.flex1 { flex: 1; }
.inline { display: inline-block; margin: 0 4px 4px 0; }
.inline-block { display: inline-block; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin: 8px 0; }
.meta-line { display: flex; gap: 20px; flex-wrap: wrap; color: var(--muted); font-size: 14px; margin-bottom: 8px; }

/* 提示条 */
.alert { border-radius: 8px; padding: 10px 14px; margin: 12px 0; font-size: 14px; }
.alert-err { background: #fbe3e0; color: #8c2b21; }
.alert-ok { background: #e0f2ea; color: #0a5c48; }
.alert-warn { background: #fdf3e0; color: #8a5a10; }
.alert-info { background: #e3eefb; color: #1d4f92; }

/* 登录页 */
.login-box { max-width: 400px; margin: 48px auto; padding: 28px; }
.login-box h1 { text-align: center; font-size: 20px; }
.login-tip { margin-top: 16px; padding: 10px 14px; background: #eef5f2; border-radius: 8px; font-size: 13px; color: #41576b; }

/* 作业预览 iframe */
iframe.preview {
  width: 100%; height: 560px; border: 1px solid var(--line); border-radius: 8px; background: #fff;
}
iframe.preview-sm { height: 420px; margin-top: 8px; }
details > summary { cursor: pointer; }

/* 批改页 */
.grade-card .grade-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.grade-card .grade-head h3 { margin: 0; }
.grade-form { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin-top: 12px; }
.grade-form label { margin: 0; }
.score-label input { width: 110px; }
.save-state { min-width: 90px; font-size: 13px; }
.save-state.ok { color: #0e7a5f; }
.save-state.err { color: var(--red); }
.score-big { font-size: 18px; color: var(--brand-dark); }
.score-final { font-size: 16px; }
.result-line { margin-top: 10px; }
.grade-row { display: flex; gap: 12px; flex-wrap: wrap; }
.grade-chip { border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; min-width: 130px; }
.grade-chip b { font-size: 20px; display: block; }

/* 分差复核 */
.flag-card { border-color: #f0c9a8; background: #fffdf8; }
.flag-item { padding: 8px 0; border-bottom: 1px dashed var(--line); }
.flag-item:last-child { border-bottom: none; }
.adj { width: 80px !important; margin: 0 !important; padding: 5px 8px !important; }

/* 课堂签到投屏 */
.checkin-bar { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.checkin-grid { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 16px; }
.qr-card { flex: 0 0 auto; text-align: center; }
.qr-box { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.qr-box svg { display: block; width: 300px; height: 300px; }
.code-card { flex: 1; min-width: 280px; display: flex; flex-direction: column; justify-content: center; }
.big-code { font-size: 88px; font-weight: 800; letter-spacing: 12px; color: var(--brand-dark); line-height: 1.2; font-variant-numeric: tabular-nums; }
.keep { word-break: break-all; user-select: all; color: var(--txt); }
.countdown { color: var(--muted); font-size: 14px; }
.checkin-count { margin-top: 12px; font-size: 20px; }
.checkin-count b { font-size: 40px; color: var(--brand-dark); }
.checkin-lists { display: grid; grid-template-columns: 3fr 2fr; gap: 16px; }
@media (max-width: 860px) { .checkin-lists { grid-template-columns: 1fr; } .big-code { font-size: 56px; letter-spacing: 8px; } }
.code-input { text-align: center; font-size: 22px; letter-spacing: 6px; }
.submit-row label.none { display: inline-block; }

/* 页脚 */
.foot { border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; padding: 14px 0; text-align: center; }

@media (max-width: 720px) {
  .bar-inner { flex-wrap: wrap; padding: 8px 0; }
  main.wrap { padding-top: 16px; }
  h1 { font-size: 19px; }
}