:root{
  --blue:#0b3d91; --blue2:#1259c6; --ink:#1a2233; --muted:#6b7280;
  --line:#e5e7eb; --bg:#f5f7fb; --ok:#0a7a3f; --warn:#b45309; --err:#b91c1c;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.55}
a{color:var(--blue2);text-decoration:none}
a:hover{text-decoration:underline}
.topbar{display:flex;justify-content:space-between;align-items:center;
  background:var(--blue);color:#fff;padding:12px 22px}
.topbar .brand a{color:#fff;font-weight:700;font-size:17px}
.topbar nav a{color:#dbe6ff;margin-left:16px;font-size:14px}
.topbar nav a:hover{color:#fff}
.topbar nav a.muted{color:#9fb6e8}
.container{max-width:940px;margin:26px auto;padding:0 18px}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px 24px;margin-bottom:20px;
  box-shadow:0 1px 2px rgba(16,24,40,.04)}
.card.narrow{max-width:440px;margin-left:auto;margin-right:auto}
h1{font-size:22px;margin:0 0 10px}
h2{font-size:17px;margin:6px 0 12px}
.hint{color:var(--muted);font-size:13.5px}
.muted{color:var(--muted)}
.strong{font-weight:700}
label{display:block;margin:12px 0;font-size:14px;font-weight:600}
input,select{width:100%;margin-top:6px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;
  font-size:15px;font-weight:400}
button,.btn{display:inline-block;background:var(--blue2);color:#fff;border:0;border-radius:8px;
  padding:10px 18px;font-size:15px;font-weight:600;cursor:pointer;margin-top:8px}
button:hover,.btn:hover{background:var(--blue);text-decoration:none}
.btn-sm{display:inline-block;background:#eef2ff;color:var(--blue2);border:1px solid #c7d2fe;
  border-radius:6px;padding:4px 10px;font-size:12.5px;font-weight:600;cursor:pointer}
.btn-sm:hover{background:#e0e7ff;text-decoration:none}
.alert{background:#fef2f2;border:1px solid #fecaca;color:var(--err);padding:10px 12px;border-radius:8px;
  font-size:14px;margin:10px 0}
table.grid{width:100%;border-collapse:collapse;margin:8px 0}
table.grid th,table.grid td{border-bottom:1px solid var(--line);padding:9px 10px;text-align:left;font-size:14px}
table.grid th{color:var(--muted);font-weight:600;font-size:12.5px;text-transform:uppercase;letter-spacing:.02em}
table.grid.small th,table.grid.small td{font-size:12.5px;padding:6px 7px}
tr.mine{background:#eff6ff}
.badge{display:inline-block;padding:2px 9px;border-radius:999px;font-size:12px;font-weight:600}
.s-done{background:#dcfce7;color:var(--ok)}
.s-grading,.s-queued,.s-pending{background:#fef9c3;color:var(--warn)}
.s-error{background:#fee2e2;color:var(--err)}
.err{color:var(--err);font-size:12px;margin-top:3px}
.msg{max-width:240px;font-size:12px;color:var(--muted)}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.tab{padding:7px 14px;border:1px solid var(--line);border-radius:999px;font-size:13.5px;background:#fff}
.tab.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.tab.active:hover{color:#fff}
.foot{text-align:center;color:var(--muted);font-size:12.5px;padding:18px}

/* --- 팀/실습 확장 --- */
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 14px}
.chip{display:inline-block;padding:6px 12px;border:1px solid var(--line);border-radius:999px;font-size:13px;
  background:#fff;color:var(--ink);text-decoration:none}
.chip:hover{text-decoration:none;border-color:#c7d2fe}
.chip.ok{background:#dcfce7;border-color:#bbf7d0;color:#0a7a3f;font-weight:600}
.chip.try{background:#fef9c3;border-color:#fde68a;color:#b45309}
.btn-sm.reject{background:#fef2f2;color:#b91c1c;border-color:#fecaca}
.btn-sm.reject:hover{background:#fee2e2}
pre.readme{white-space:pre-wrap;word-break:break-word;background:#f8fafc;border:1px solid var(--line);
  border-radius:8px;padding:16px;font-size:13px;line-height:1.5;max-height:520px;overflow:auto;
  font-family:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;color:#1f2937}
.s-passed{background:#dcfce7;color:#0a7a3f}
.s-queued,.s-grading{background:#fef9c3;color:#b45309}

.container.wide{max-width:1180px}
.grid2col{display:grid;grid-template-columns:1.3fr 1fr;gap:20px;align-items:start}
@media(max-width:840px){.grid2col{grid-template-columns:1fr}}

.md-body{font-size:14.5px;line-height:1.65;max-height:640px;overflow:auto}
.md-body h1,.md-body h2,.md-body h3{margin:18px 0 8px;line-height:1.3}
.md-body h1:first-child,.md-body h2:first-child,.md-body h3:first-child{margin-top:0}
.md-body h1{font-size:19px}
.md-body h2{font-size:16.5px;border-bottom:1px solid var(--line);padding-bottom:6px}
.md-body h3{font-size:14.5px}
.md-body p,.md-body ul,.md-body ol{margin:8px 0}
.md-body ul,.md-body ol{padding-left:22px}
.md-body li{margin:3px 0}
.md-body code{background:#f1f5f9;border-radius:4px;padding:1px 5px;font-size:.92em;
  font-family:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace}
.md-body pre{background:#f8fafc;border:1px solid var(--line);border-radius:8px;padding:12px 14px;
  overflow-x:auto;font-size:13px;line-height:1.5}
.md-body pre code{background:none;padding:0}
.md-body blockquote{margin:8px 0;padding:2px 14px;border-left:3px solid var(--line);color:var(--muted)}
.md-body table{width:100%;border-collapse:collapse;margin:10px 0;display:block;overflow-x:auto}
.md-body th,.md-body td{border:1px solid var(--line);padding:6px 10px;text-align:left;font-size:13.5px}
.md-body th{background:#f8fafc;font-weight:600}
.md-body hr{border:0;border-top:1px solid var(--line);margin:16px 0}