:root {
  --blue: #2a78d6; --dblue: #1d4f91; --violet: #4a3aa7;
  --bsoft: #e8f1fc; --vsoft: #eeecf9;
  --ink: #1e2430; --ink2: #4d5462; --ink3: #8a909c;
  --line: #e1e6ee; --card: #fff; --bg: #f4f6fa; --track: #eef1f5;
  --red: #d93f3e; --orange: #d97c0f; --green: #2e9e6b;
  --radius: 12px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.6 -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif; }
a { color: var(--blue); text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
h1, h2, h3 { margin: 0; line-height: 1.3; }
h1 { font-size: 22px; } h2 { font-size: 17px; } h3 { font-size: 15px; }

.topbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px; background: linear-gradient(90deg, #1f5fae, var(--violet)); color: #fff; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 600; font-size: 17px; }
.brand small { font-weight: 400; opacity: .8; font-size: 12px; margin-left: 4px; }
.logo { width: 30px; height: 30px; border-radius: 8px; background: #fff; color: var(--blue); display: grid; place-items: center; font-size: 16px; }
.top-right { display: flex; align-items: center; gap: 10px; font-size: 13px; }
.top-right button { background: rgba(255,255,255,.15); border: 0; color: #fff; padding: 5px 10px; border-radius: 6px; cursor: pointer; }

#banner .demo { background: #fff6e5; color: #7a4b00; border-bottom: 1px solid #f3dfb5; padding: 8px 16px; font-size: 13px; text-align: center; }
main { max-width: 1120px; margin: 0 auto; padding: 20px 16px 80px; }
.loading-page { padding: 60px 0; text-align: center; color: var(--ink3); }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin-bottom: 16px; }
.card-h { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.card-h h2 { display: flex; align-items: center; gap: 8px; }
.card-h h2::before { content: ""; width: 4px; height: 16px; background: var(--blue); border-radius: 2px; }
.muted { color: var(--ink3); font-size: 13px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 800px) { .grid2, .grid3 { grid-template-columns: 1fr; } }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border: 1px solid var(--line); background: #fff;
  padding: 8px 16px; border-radius: 8px; cursor: pointer; font-size: 14px; white-space: nowrap; color: var(--ink); }
.btn:hover { border-color: var(--blue); color: var(--blue); }
.btn.primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn.primary:hover { background: var(--dblue); color: #fff; }
.btn.violet { background: var(--violet); border-color: var(--violet); color: #fff; }
.btn.big { padding: 12px 22px; font-size: 16px; border-radius: 10px; }
.btn.small { padding: 4px 10px; font-size: 13px; }
.btn.danger:hover { border-color: var(--red); color: var(--red); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.link-btn { background: none; border: 0; color: var(--ink3); cursor: pointer; font-size: 13px; padding: 2px 4px; }
.link-btn:hover { color: var(--red); }

label.f { display: block; margin-bottom: 12px; }
label.f > span { display: block; font-size: 13px; color: var(--ink2); margin-bottom: 4px; }
input[type=text], input[type=password], input[type=date], input[type=number], select, textarea {
  width: 100%; padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px; background: #fff; outline: none; }
input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px var(--bsoft); }
textarea { resize: vertical; min-height: 60px; }

.auth { max-width: 380px; margin: 40px auto; }
.auth .tabs { display: flex; margin-bottom: 16px; border-bottom: 1px solid var(--line); }
.auth .tabs button { flex: 1; background: none; border: 0; padding: 10px; cursor: pointer; color: var(--ink3); border-bottom: 2px solid transparent; }
.auth .tabs button.on { color: var(--blue); border-color: var(--blue); font-weight: 600; }
.hero { text-align: center; margin: 30px 0 10px; }
.hero h1 { font-size: 26px; }
.hero p { color: var(--ink2); margin: 8px 0 0; }

.class-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.class-item { display: block; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; color: var(--ink); transition: .15s; }
.class-item:hover { border-color: var(--blue); box-shadow: 0 4px 14px rgba(42,120,214,.1); }
.class-item h3 { font-size: 17px; }
.class-item .muted { margin-top: 6px; }
.class-item.add { display: grid; place-items: center; color: var(--blue); border-style: dashed; min-height: 100px; cursor: pointer; }

.crumb { font-size: 13px; color: var(--ink3); margin-bottom: 8px; }
.page-h { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }

.tabs2 { display: flex; gap: 4px; margin-bottom: 14px; border-bottom: 1px solid var(--line); }
.tabs2 button { background: none; border: 0; padding: 8px 14px; cursor: pointer; color: var(--ink2); border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tabs2 button.on { color: var(--blue); border-color: var(--blue); font-weight: 600; }

.exam-row { display: flex; gap: 14px; align-items: center; padding: 12px 4px; border-bottom: 1px solid var(--line); color: var(--ink); }
.exam-row:last-child { border-bottom: 0; }
.exam-row:hover { background: #fafbfd; }
.exam-row .score { font-size: 20px; font-weight: 700; min-width: 64px; text-align: center; }
.exam-row .score small { display: block; font-size: 11px; font-weight: 400; color: var(--ink3); }
.exam-row .body { flex: 1; min-width: 0; }
.exam-row .headline { color: var(--red); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; }
.kpi { border: 1px solid var(--line); border-radius: 10px; padding: 10px; text-align: center; }
.kpi b { display: block; font-size: 24px; line-height: 1.2; }
.kpi span { font-size: 12px; color: var(--ink3); }
.red { color: var(--red); } .orange { color: var(--orange); } .green { color: var(--green); }

.bars { display: grid; gap: 8px; }
.bar { display: grid; grid-template-columns: 110px 1fr 52px; gap: 8px; align-items: center; font-size: 13px; }
.bar.nolbl { grid-template-columns: 0 1fr 52px; gap: 0 8px; }
.bar .lbl { color: var(--ink2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar .track { height: 10px; background: var(--track); border-radius: 5px; overflow: hidden; }
.bar .fill { height: 100%; border-radius: 5px; }
.bar .val { font-weight: 600; text-align: right; }

table.q { width: 100%; border-collapse: collapse; font-size: 14px; }
table.q th, table.q td { padding: 6px 6px; border-bottom: 1px solid var(--line); text-align: left; }
table.q th { font-weight: 500; color: var(--ink3); font-size: 12px; }
table.q input { padding: 5px 8px; }
table.q td.num { width: 80px; }
.table-wrap { overflow-x: auto; }
.tag { display: inline-block; font-size: 11px; padding: 1px 7px; border-radius: 10px; background: var(--bsoft); color: var(--blue); font-weight: 600; }
.tag.mem { background: var(--vsoft); color: var(--violet); }
.tag.warn { background: #fff1e0; color: var(--orange); }
.tag.gray { background: var(--track); color: var(--ink2); }
.note { background: #fff8ec; border: 1px solid #f5e1bd; color: #7a4b00; padding: 8px 12px; border-radius: 8px; font-size: 13px; margin-bottom: 12px; }

.diag-head { font-size: 18px; font-weight: 700; color: var(--red); margin-bottom: 6px; }
.diag-insight { color: var(--ink2); }
.mem-link { margin-top: 12px; background: var(--vsoft); border-radius: 8px; padding: 10px 12px; color: #352a7a; font-size: 14px; }
.wp { display: flex; gap: 10px; padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: 14px; }
.wp:last-child { border-bottom: 0; }
ul.clean { margin: 0; padding-left: 18px; }
ul.clean li { margin: 4px 0; }

.tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
@media (max-width: 640px) { .tiers { grid-template-columns: 1fr; } }
.tier { border: 1px solid var(--line); border-radius: 10px; padding: 10px; font-size: 13px; }
.tier h4 { margin: 0 0 4px; font-size: 14px; }
.tier .names { color: var(--ink2); max-height: 120px; overflow: auto; }

.photos { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.photo { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; font-size: 13px; }
.photo img { width: 100%; height: 160px; object-fit: cover; display: block; background: var(--track); cursor: zoom-in; }
.photo .items { padding: 8px 10px; }
.photo .it { padding: 4px 0; border-bottom: 1px dashed var(--line); }
.photo .it:last-child { border-bottom: 0; }

.plan-edit .flow-row { display: grid; grid-template-columns: 64px 120px 1fr 90px 32px; gap: 6px; margin-bottom: 6px; align-items: center; }
@media (max-width: 640px) { .plan-edit .flow-row { grid-template-columns: 56px 1fr 80px 28px; } .plan-edit .flow-row .fd { grid-column: 1 / -1; order: 5; } }
.plan-edit h3 { margin: 16px 0 8px; display: flex; align-items: center; gap: 8px; }
.plan-edit .hw-row { display: grid; grid-template-columns: 90px 1fr; gap: 8px; align-items: center; margin-bottom: 6px; }
.sticky-actions { position: sticky; bottom: 0; background: rgba(255,255,255,.95); backdrop-filter: blur(6px); border-top: 1px solid var(--line); margin: 16px -18px -18px; padding: 12px 18px; border-radius: 0 0 var(--radius) var(--radius); }

.drop { border: 2px dashed var(--line); border-radius: 10px; padding: 18px; text-align: center; cursor: pointer; color: var(--ink2); background: #fafbfd; transition: .15s; }
.drop:hover, .drop.over { border-color: var(--blue); background: var(--bsoft); }
.drop input { display: none; }
.thumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.thumbs div { position: relative; }
.thumbs img { width: 72px; height: 72px; object-fit: cover; border-radius: 6px; border: 1px solid var(--line); }
.thumbs button { position: absolute; top: -6px; right: -6px; width: 20px; height: 20px; border-radius: 50%; border: 0; background: var(--ink); color: #fff; font-size: 12px; cursor: pointer; line-height: 1; }

.timeline { position: relative; padding-left: 18px; }
.timeline::before { content: ""; position: absolute; left: 5px; top: 6px; bottom: 6px; width: 2px; background: var(--line); }
.tl { position: relative; padding: 6px 0 12px; }
.tl::before { content: ""; position: absolute; left: -17px; top: 12px; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); }
.tl.feedback::before { background: var(--violet); }
.tl.note::before { background: var(--ink3); }
.tl .when { font-size: 12px; color: var(--ink3); }
.kph { margin-bottom: 14px; }
.kph .chain { display: flex; align-items: center; flex-wrap: wrap; gap: 4px; font-size: 13px; margin-top: 4px; }
.kph .node { padding: 3px 8px; border-radius: 6px; background: var(--track); }
.kph .arrow { color: var(--red); }

.empty { text-align: center; padding: 30px 10px; color: var(--ink3); }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 18px 0; }
@media (max-width: 640px) { .steps { grid-template-columns: 1fr 1fr; } }
.step { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 12px; font-size: 13px; color: var(--ink2); }
.step b { display: block; color: var(--ink); font-size: 14px; margin-bottom: 2px; }

#toast { position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%); z-index: 100; }
#toast div { background: rgba(30,36,48,.92); color: #fff; padding: 10px 18px; border-radius: 8px; margin-top: 8px; font-size: 14px; max-width: 86vw; }
#toast div.err { background: var(--red); }
#busy { position: fixed; inset: 0; background: rgba(20,26,38,.45); z-index: 90; display: grid; place-items: center; }
#busy[hidden] { display: none; }
.busy-card { background: #fff; border-radius: 14px; padding: 26px 34px; text-align: center; min-width: 260px; max-width: 86vw; }
.busy-sub { font-size: 12px; color: var(--ink3); margin-top: 6px; }
.spinner { width: 34px; height: 34px; border: 3px solid var(--bsoft); border-top-color: var(--blue); border-radius: 50%; margin: 0 auto 12px; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.lightbox { position: fixed; inset: 0; background: rgba(0,0,0,.85); z-index: 95; display: grid; place-items: center; cursor: zoom-out; }
.lightbox img { max-width: 94vw; max-height: 94vh; }

/* ---------- 管理端 ---------- */
.admin-link { color: #fff; background: rgba(255,255,255,.15); padding: 5px 10px; border-radius: 6px; }
.quota-pill { background: rgba(255,255,255,.15); padding: 3px 9px; border-radius: 10px; font-size: 12px; }
code { font-family: ui-monospace, Consolas, monospace; background: var(--track); padding: 1px 6px; border-radius: 4px; font-size: 13px; }
tr.off td { color: var(--ink3); }
table.admin-users td { white-space: nowrap; }
.chart { position: relative; display: grid; grid-template-columns: 32px 1fr; gap: 6px; height: 220px; }
.chart-y { display: flex; flex-direction: column; justify-content: space-between; text-align: right; font-size: 11px; color: var(--ink3); padding-bottom: 20px; margin-top: -7px; }
.chart-plot { position: relative; display: grid; grid-template-rows: 1fr 20px; }
.chart-grid { position: absolute; inset: 0 0 20px 0; display: flex; flex-direction: column; justify-content: space-between; pointer-events: none; }
.chart-grid i { border-top: 1px solid var(--line); }
.chart-grid i:last-child { border-top-color: #c9d0db; }
.chart-bars { position: relative; display: flex; align-items: flex-end; gap: 2px; height: 100%; }
.cb { flex: 1; height: 100%; display: flex; align-items: flex-end; justify-content: center; cursor: default; outline: none; }
.cb-fill { width: min(14px, 70%); background: var(--blue); border-radius: 4px 4px 0 0; min-height: 0; transition: opacity .12s; }
.cb.dim .cb-fill { opacity: .35; }
.cb:focus-visible .cb-fill { box-shadow: 0 0 0 2px var(--dblue); }
.chart-x { display: flex; gap: 2px; font-size: 11px; color: var(--ink3); }
.chart-x span { flex: 1; text-align: center; white-space: nowrap; overflow: visible; }
.chart-tip { position: absolute; z-index: 5; width: 140px; background: var(--ink); color: #fff; font-size: 12px; line-height: 1.5; padding: 6px 9px; border-radius: 6px; white-space: pre-line; pointer-events: none; }

/* ---------- 讲评清单 ---------- */
.rv-head { font-size: 16px; font-weight: 600; line-height: 1.6; margin-bottom: 14px; }
.rv-tiers { display: grid; gap: 12px; grid-template-columns: repeat(3, 1fr); }
.rv-tiers.n2 { grid-template-columns: repeat(2, 1fr); }
.rv-tiers.n1 { grid-template-columns: 1fr; }
@media (max-width: 800px) { .rv-tiers, .rv-tiers.n2 { grid-template-columns: 1fr; } }
.rv-tier { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; min-width: 0; }
.rv-th { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; padding: 8px 12px; font-size: 13px; }
.rv-th b { font-size: 15px; }
.rv-tier.m-all .rv-th { background: #fde8e8; color: var(--red); }
.rv-tier.m-grp .rv-th { background: #fff1e0; color: var(--orange); }
.rv-tier.m-self .rv-th { background: #e6f5ee; color: var(--green); }
.rv-g { padding: 10px 12px; border-top: 1px dashed var(--line); font-size: 13px; }
.rv-th + .rv-g { border-top: 0; }
.rv-kp { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; }
.rv-kp b { font-size: 14px; }
.rv-qs { display: flex; flex-wrap: wrap; gap: 6px; }
.rv-q summary { list-style: none; cursor: pointer; padding: 2px 9px; border-radius: 12px; background: var(--track); font-size: 13px; white-space: nowrap; }
.rv-q summary::-webkit-details-marker { display: none; }
.rv-q summary i { font-style: normal; font-weight: 600; }
.rv-q[open] { flex-basis: 100%; }
.rv-q[open] summary { background: var(--bsoft); display: inline-block; }
.rv-names { margin-top: 6px; color: var(--ink2); line-height: 1.7; }
.rv-who { margin-top: 6px; color: var(--ink2); }
.rv-who .tag { margin-right: 6px; }
.rv-flag { margin-top: 6px; color: #7a4b00; background: #fff8ec; border-radius: 6px; padding: 4px 8px; }
.tag.mode.m-all { background: #fde8e8; color: var(--red); }
.tag.mode.m-grp { background: #fff1e0; color: var(--orange); }
.tag.mode.m-self { background: #e6f5ee; color: var(--green); }
.tag.mode.m-skip { background: var(--track); color: var(--ink3); }

/* ---------- 过关检测 ---------- */
.rt-row { display: grid; grid-template-columns: minmax(140px, 1.2fr) 2fr auto; gap: 6px 14px; align-items: center; padding: 10px 0; border-top: 1px dashed var(--line); font-size: 14px; }
.rt-kp { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.rt-cmp { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.rt-n { font-weight: 600; color: var(--ink2); }
.rt-n.big { font-size: 20px; }
.rt-arrow { color: var(--ink3); }
.rt-failed { grid-column: 1 / -1; color: var(--ink2); font-size: 13px; }
@media (max-width: 640px) { .rt-row { grid-template-columns: 1fr auto; } .rt-row .rt-kp { grid-column: 1 / -1; } }
.tag.rt.ok { background: #e6f5ee; color: var(--green); }
.tag.rt.mid { background: #fff1e0; color: var(--orange); }
.tag.rt.bad { background: #fde8e8; color: var(--red); }
.rt-f { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.rt-f input { width: auto; }
#rtN { width: 90px; }
.rt-in { padding: 12px 0; border-top: 1px dashed var(--line); }
.rt-in .rt-kp { margin-bottom: 8px; }
.rt-in .rtP { width: 130px; }
.rt-fail { margin-top: 8px; font-size: 13px; }
.rt-fail summary { cursor: pointer; color: var(--blue); }
.rt-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.rt-chips label { cursor: pointer; }
.rt-chips input { position: absolute; opacity: 0; width: 0; height: 0; }
.rt-chips span { display: inline-block; padding: 2px 10px; border-radius: 12px; background: var(--track); }
.rt-chips input:checked + span { background: #fde8e8; color: var(--red); font-weight: 600; }
.rt-chips input:focus-visible + span { outline: 2px solid var(--blue); }
.kph .node.rt { background: #fff; border: 1px dashed var(--line); }
.tl.retest::before { background: var(--green); }

.plan-edit .hw-row.var-row { grid-template-columns: 90px 1fr 200px; }
@media (max-width: 640px) { .plan-edit .hw-row.var-row { grid-template-columns: 90px 1fr; } .plan-edit .hw-row.var-row .va { grid-column: 1 / -1; } }