:root {
  --bg: #f4f6f9;
  --card: #fff;
  --text: #1a2332;
  --muted: #5b6b7c;
  --primary: #1f6feb;
  --primary-dark: #1558c0;
  --border: #d8e0ea;
  --danger: #c62828;
  --ok: #1b7f4a;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08);
  font-family: "Noto Sans TC", "PingFang HK", "Microsoft JhengHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  background: #0f2744;
  color: #fff;
}
.topbar a { color: #fff; }
.brand { font-weight: 700; font-size: 1.1rem; }
.topbar nav { display: flex; gap: 0.85rem; flex: 1; }
.userbox { display: flex; align-items: center; gap: 0.75rem; font-size: 0.9rem; }

.container {
  width: min(960px, 100%);
  margin: 0 auto;
  padding: 1.25rem;
  flex: 1;
}
.footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 1rem;
}

.page-head h1 { margin: 0 0 0.25rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}
.card h2 { margin-top: 0; font-size: 1.15rem; }
.card h3 { font-size: 1rem; margin-bottom: 0.5rem; }

.grid.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 720px) {
  .grid.two { grid-template-columns: 1fr; }
  .topbar { flex-wrap: wrap; }
}

.list { list-style: none; padding: 0; margin: 0; }
.list li {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--border);
}
.list li:last-child { border-bottom: none; }
.list.stacked .ann-item { padding: 0.85rem 0; }
.ann-head { display: flex; gap: 0.5rem; align-items: baseline; flex-wrap: wrap; }

.tag {
  display: inline-block;
  background: #e8eef8;
  color: #294870;
  font-size: 0.75rem;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  margin-left: 0.35rem;
}
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

.form { display: flex; flex-direction: column; gap: 0.75rem; }
.form.row { flex-direction: row; flex-wrap: wrap; align-items: flex-end; gap: 0.75rem; }
.form label { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.9rem; flex: 1; min-width: 140px; }
input, select, textarea {
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  background: #fff;
}
textarea { resize: vertical; }

.btn {
  border: none;
  border-radius: 8px;
  padding: 0.5rem 0.9rem;
  font: inherit;
  cursor: pointer;
  background: #e8edf3;
  color: var(--text);
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,0.35); }
.btn-danger { background: #fdecea; color: var(--danger); border: 1px solid #f5c6cb; }
.btn-danger:hover { background: var(--danger); color: #fff; }
.card-danger { border: 1px solid #f5c6cb; }
.form .checkbox { flex-direction: row; align-items: center; gap: 0.5rem; min-width: 0; }
.form .checkbox input { width: auto; }
.inline { display: inline; margin: 0; }

.table { width: 100%; border-collapse: collapse; }
.table th, .table td {
  text-align: left;
  padding: 0.55rem 0.4rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
}

.alert {
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}
.alert-error { background: #fdecea; color: var(--danger); }
.alert-ok { background: #e7f6ee; color: var(--ok); }

.login-card { max-width: 400px; margin: 2rem auto; }

.status {
  display: inline-block;
  font-size: 0.8rem;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-weight: 600;
}
.status-ok { background: #e7f6ee; color: var(--ok); }
.status-warn { background: #fff6e5; color: #9a6b00; }
.status-bad { background: #fdecea; color: var(--danger); }

.admin-class-block {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
}
.admin-class-block:last-child { border-bottom: none; }
.admin-class-block h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }

.btn + .btn, a.btn { margin-right: 0.35rem; margin-bottom: 0.35rem; display: inline-block; }