:root{
  --bg:#f6f7fb; --card:#fff; --ink:#1f2937; --muted:#6b7280;
  --brand:#2563eb; --brand-ink:#fff; --ring:#93c5fd; --border:#e5e7eb;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,'Noto Sans TC',Segoe UI,Roboto,sans-serif}
h1{font-size:1.4rem;margin:0}
h2{font-size:1.1rem;margin:.25rem 0 .5rem}
header{position:sticky;top:0;background:linear-gradient(180deg,#fff,rgba(255,255,255,.85));backdrop-filter:saturate(1.2) blur(8px);
  border-bottom:1px solid var(--border);padding:.8rem .9rem;z-index:10}
.muted{color:var(--muted);font-size:.95rem;margin:.3rem 0 0}

.auth{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap;margin-top:.4rem}
.repoLine,.workspace{display:flex;gap:.5rem;align-items:center;margin-top:.4rem;flex-wrap:wrap}
.repoLine input,.workspace input{padding:.55rem .7rem;border:1px solid var(--border);border-radius:.6rem;min-width:15ch}
.primary{background:var(--brand);color:#fff;border:none;padding:.6rem .9rem;border-radius:.6rem}
.ghost{background:#fff;border:1px solid var(--border);padding:.6rem .9rem;border-radius:.6rem}

.grid{display:grid;gap:1rem;padding:1rem}
@media(min-width:960px){.grid{grid-template-columns:1fr 1.2fr}}

.card{background:var(--card);border:1px solid var(--border);border-radius:1rem;padding:1rem}
.row{display:grid;gap:.5rem;margin:.7rem 0}
.row label{font-weight:600}
textarea,input{width:100%;padding:.6rem .7rem;border:1px solid var(--border);border-radius:.6rem;font:inherit}
textarea:focus,input:focus{outline:none;box-shadow:0 0 0 3px var(--ring)}

.subjects{display:flex;gap:.4rem;flex-wrap:wrap}
.subjects button{padding:.5rem .8rem;border:1px solid var(--border);background:#fff;border-radius:999px}
.subjects button.active{background:var(--brand);color:#fff;border-color:var(--brand)}

.actions{display:flex;gap:.6rem;margin-top:.6rem;flex-wrap:wrap}
.toolbar{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap;margin-bottom:.6rem}
.stats{display:flex;gap:.6rem;flex-wrap:wrap;margin:.4rem 0 .8rem}
.stat{background:#f1f5f9;border:1px solid var(--border);border-radius:.6rem;padding:.4rem .6rem;font-size:.9rem}

.list{display:grid;gap:.6rem}
.item{border:1px solid var(--border);border-radius:.8rem;padding:.8rem;background:#fff}
.item .rowline{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap}
.badge{padding:.1rem .5rem;border-radius:999px;border:1px solid var(--border);background:#fafafa}
.groupTag{font-weight:700}

.meta{color:var(--muted);font-size:.9rem;white-space:pre-wrap}
.actions-line{display:flex;gap:.4rem;margin-top:.4rem}
.actions-line button{border:1px solid var(--border);background:#fff;border-radius:.5rem;padding:.35rem .6rem}