/* 学生作业上传 —— 全局样式（浅色主题） */
:root{
  --bg:#f5f7fb;
  --card:#ffffff;
  --ink:#111827;
  --ink-2:#4b5563;
  --ink-3:#8b95a5;
  --line:#e5e8ef;
  --brand:#2563eb;
  --brand-d:#1d4ed8;
  --brand-l:#eff5ff;
  --ok:#0f9d58;
  --ok-l:#e9f7ef;
  --warn:#c47f17;
  --warn-l:#fdf4e3;
  --err:#dc2626;
  --err-l:#fdecec;
  --radius:14px;
  --shadow:0 1px 2px rgba(16,24,40,.05), 0 6px 20px -8px rgba(16,24,40,.12);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--ink);
  font:15px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
code{background:#eef1f6;border-radius:5px;padding:1px 6px;font-size:.9em;font-family:ui-monospace,Consolas,monospace}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.wide-page .wrap{max-width:1360px}

/* ---------------- topbar ---------------- */
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:62px;gap:16px}
.brand{display:flex;align-items:center;gap:11px;color:inherit}
.brand:hover{text-decoration:none}
.brand-logo{width:38px;height:38px;display:grid;place-items:center;background:var(--brand-l);border-radius:11px;font-size:19px}
.brand strong{display:block;font-size:15.5px;line-height:1.2}
.brand em{display:block;font-style:normal;font-size:12px;color:var(--ink-3);line-height:1.4}
.nav{display:flex;align-items:center;gap:4px;flex-shrink:0}
.nav a{padding:7px 13px;border-radius:9px;color:var(--ink-2);font-size:14px}
.nav a:hover{background:#f2f4f8;text-decoration:none}
.nav a.active{background:var(--brand-l);color:var(--brand-d);font-weight:600}
.nav a.dim{color:var(--ink-3)}

.main{padding-top:26px;padding-bottom:56px;min-height:calc(100vh - 170px)}
.footer{padding-bottom:26px;color:var(--ink-3);font-size:12.5px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.footer .dot{opacity:.5}

/* ---------------- card ---------------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin-bottom:18px}
.card h2{margin:0 0 4px;font-size:17px}
.card .sub{margin:0 0 18px;color:var(--ink-3);font-size:13px}
.card.tight{padding:16px 18px}

.grid{display:grid;gap:18px}
@media(min-width:900px){ .grid.two{grid-template-columns:1.35fr 1fr} }

/* ---------------- form ---------------- */
label.field{display:block;margin-bottom:16px}
label.field > span.lb{display:flex;align-items:center;gap:6px;font-size:13.5px;font-weight:600;margin-bottom:7px;color:var(--ink-2)}
.req{color:var(--err);font-weight:700}
.hint{font-size:12px;color:var(--ink-3);font-weight:400}
input[type=text],input[type=password],input[type=search],select,textarea{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:10px;background:#fcfdff;
  font:inherit;color:var(--ink);outline:none;transition:.16s;
}
input:focus,select:focus,textarea:focus{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(37,99,235,.12)}
input.bad,select.bad{border-color:var(--err);background:var(--err-l)}
.err-msg{color:var(--err);font-size:12.5px;margin-top:5px;display:none}
.err-msg.show{display:block}
.row2{display:grid;gap:0 16px}
@media(min-width:640px){ .row2{grid-template-columns:1fr 1fr} }

/* ---------------- dropzone ---------------- */
.drop{border:2px dashed #ccd4e2;border-radius:12px;background:#fbfcfe;padding:26px 18px;text-align:center;cursor:pointer;transition:.16s}
.drop:hover,.drop.over{border-color:var(--brand);background:var(--brand-l)}
.drop .big{font-size:28px;line-height:1}
.drop p{margin:9px 0 3px;font-weight:600}
.drop small{color:var(--ink-3)}

.filelist{margin-top:12px;display:flex;flex-direction:column;gap:8px}
.fileitem{display:flex;align-items:center;gap:10px;padding:9px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:13.5px}
.fileitem .nm{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.fileitem .sz{color:var(--ink-3);font-size:12.5px;flex-shrink:0}
.fileitem button{border:0;background:transparent;color:var(--ink-3);cursor:pointer;font-size:15px;padding:2px 6px;border-radius:6px}
.fileitem button:hover{background:var(--err-l);color:var(--err)}

/* ---------------- buttons ---------------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:11px 20px;border:1px solid transparent;border-radius:10px;
  background:var(--brand);color:#fff;font:inherit;font-weight:600;cursor:pointer;transition:.16s;white-space:nowrap}
.btn:hover{background:var(--brand-d)}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn.block{width:100%;padding:13px}
.btn.ghost{background:#fff;border-color:var(--line);color:var(--ink-2)}
.btn.ghost:hover{background:#f4f6fa;color:var(--ink)}
.btn.sm{padding:6px 12px;font-size:13px;border-radius:8px}
.btn.danger{background:#fff;border-color:#f3c7c7;color:var(--err)}
.btn.danger:hover{background:var(--err-l)}

/* ---------------- progress / tasks ---------------- */
.task{border:1px solid var(--line);border-radius:12px;padding:13px 15px;margin-bottom:10px;background:#fff}
.task .top{display:flex;align-items:center;gap:10px;font-size:13.5px}
.task .top .nm{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}
.bar{height:7px;border-radius:99px;background:#eef1f6;overflow:hidden;margin:9px 0 6px}
.bar > i{display:block;height:100%;width:0;background:linear-gradient(90deg,#3b82f6,#2563eb);border-radius:99px;transition:width .35s}
.bar.done > i{background:linear-gradient(90deg,#34d399,#0f9d58)}
.bar.fail > i{background:linear-gradient(90deg,#f87171,#dc2626)}
.task .msg{font-size:12.5px;color:var(--ink-3);display:flex;justify-content:space-between;gap:10px}
.task .msg .p{flex-shrink:0;font-variant-numeric:tabular-nums}
@media(max-width:640px){ .task .msg{flex-direction:column;gap:2px} }

/* ---------------- pills / badges ---------------- */
.pill{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:99px;font-size:12px;font-weight:600;white-space:nowrap}
.pill.ok{background:var(--ok-l);color:var(--ok)}
.pill.err{background:var(--err-l);color:var(--err)}
.pill.run{background:var(--brand-l);color:var(--brand-d)}
.pill.wait{background:#f1f3f7;color:var(--ink-3)}
.pill.warn{background:var(--warn-l);color:var(--warn)}

/* ---------------- notice ---------------- */
.notice{display:flex;gap:11px;padding:13px 15px;border-radius:11px;font-size:13.5px;line-height:1.6;margin-bottom:16px}
.notice .ic{flex-shrink:0;font-size:16px}
.notice.info{background:var(--brand-l);color:#1e40af;border:1px solid #d6e4ff}
.notice.warn{background:var(--warn-l);color:#8a5a0b;border:1px solid #f5e2bd}
.notice.err{background:var(--err-l);color:#a12020;border:1px solid #f7d2d2}
.notice.ok{background:var(--ok-l);color:#0b6b3d;border:1px solid #cceadb}
.notice a{color:inherit;text-decoration:underline;font-weight:600}

/* ---------------- stats ---------------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:12px}
.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.stat .k{font-size:12.5px;color:var(--ink-3);margin-bottom:5px}
.stat .v{font-size:22px;font-weight:700;font-variant-numeric:tabular-nums}
.stat .v small{font-size:13px;font-weight:600;color:var(--ink-3);margin-left:3px}
.stat.acc .v{color:var(--brand-d)}
.stat.ok .v{color:var(--ok)}
.stat.err .v{color:var(--err)}

/* ---------------- table ---------------- */
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end;margin-bottom:14px}
.toolbar .f{min-width:130px}
.toolbar .f.sm{min-width:104px}
.toolbar .grow{flex:1;min-width:180px}
.toolbar label{display:block;font-size:12px;color:var(--ink-3);margin-bottom:4px}
.toolbar input,.toolbar select{padding:8px 11px;font-size:13.5px}
.tbl-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:#fff}
table{width:100%;border-collapse:collapse;font-size:13.5px;min-width:1180px}
th,td{padding:11px 13px;text-align:left;border-bottom:1px solid var(--line);vertical-align:middle}
th{background:#fafbfd;font-size:12.5px;color:var(--ink-2);font-weight:600;white-space:nowrap;position:sticky;top:0}
th.col-file,td.col-file{min-width:360px}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:#fafcff}
td.num{font-variant-numeric:tabular-nums;white-space:nowrap}
td .fn{font-weight:600;word-break:break-all}
td .pp{color:var(--ink-3);font-size:12px;font-family:ui-monospace,Consolas,monospace;word-break:break-all}
td .sub2{color:var(--ink-3);font-size:12.5px;margin-top:2px}
.acts{display:flex;gap:6px;flex-wrap:wrap}
.acts .btn.sm{padding:5px 9px}

.pager{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:14px;flex-wrap:wrap;color:var(--ink-3);font-size:13px}
.pager .pgs{display:flex;gap:6px;align-items:center}
.pager button{padding:6px 12px;border:1px solid var(--line);background:#fff;border-radius:8px;cursor:pointer;font:inherit;font-size:13px;color:var(--ink-2)}
.pager button:hover:not(:disabled){background:#f4f6fa}
.pager button:disabled{opacity:.45;cursor:not-allowed}

.empty{padding:52px 20px;text-align:center;color:var(--ink-3)}
.empty .big{font-size:34px;margin-bottom:10px}

/* ---------------- steps (auth) ---------------- */
.steps{counter-reset:s;display:flex;flex-direction:column;gap:14px;margin:0;padding:0;list-style:none}
.steps li{position:relative;padding-left:38px}
.steps li::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:1px;width:24px;height:24px;border-radius:50%;
  background:var(--brand-l);color:var(--brand-d);display:grid;place-items:center;font-size:12.5px;font-weight:700}
.steps li b{display:block}
.steps li p{margin:3px 0 0;color:var(--ink-2);font-size:13.5px;word-break:break-word}
.steps li p.pathline{margin-top:5px}
.steps li code{word-break:break-all}
.checklist{display:flex;flex-direction:column;gap:9px}
.chk{display:flex;gap:10px;align-items:flex-start;padding:11px 14px;border:1px solid var(--line);border-radius:11px;background:#fff;font-size:13.5px}
.chk .ic{flex-shrink:0}
.chk.ok{border-color:#cceadb;background:var(--ok-l)}
.chk.no{border-color:#f7d2d2;background:var(--err-l)}
.chk b{display:block;margin-bottom:1px}
.chk span{color:var(--ink-2);font-size:12.5px;word-break:break-all}

.kv{display:grid;grid-template-columns:auto 1fr;gap:7px 14px;font-size:13.5px;margin:0}
.kv dt{color:var(--ink-3)}
.kv dd{margin:0;word-break:break-all}

/* ---------------- toast ---------------- */
.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);opacity:0;pointer-events:none;
  background:#111827;color:#fff;padding:11px 20px;border-radius:11px;font-size:13.5px;z-index:99;transition:.25s;max-width:88vw}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.err{background:var(--err)}
.toast.ok{background:#12734a}

/* ---------------- login ---------------- */
.login-wrap{max-width:400px;margin:5vh auto}
.mono{font-family:ui-monospace,Consolas,monospace;font-size:12.5px}
.copyrow{display:flex;gap:8px}
.copyrow input{flex:1;background:#f7f9fc}