:root {
  color-scheme: light dark;
  --bg: #0f1115;
  --card: #171a21;
  --border: #2a2f3a;
  --text: #e6e8eb;
  --muted: #9aa3b2;
  --accent: #5b9dff;
  --warn: #f5a524;
  --danger: #f04f4f;
  --ok: #2ecc71;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7f9;
    --card: #ffffff;
    --border: #e2e5ea;
    --text: #1a1d23;
    --muted: #5c6470;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Pretendard, sans-serif;
  background: var(--bg);
  color: var(--text);
}
header.topbar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.9rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  flex-wrap: wrap;
}
header.topbar h1 { font-size: 1.05rem; margin: 0; white-space: nowrap; }
header.topbar nav { display: flex; gap: 1rem; flex-wrap: wrap; }
header.topbar nav a { color: var(--muted); text-decoration: none; font-size: 0.9rem; }
header.topbar nav a:hover, header.topbar nav a.active { color: var(--accent); }
main { padding: 1.5rem; max-width: 1200px; margin: 0 auto; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem 1.3rem;
  margin-bottom: 1.2rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
.stat-label { color: var(--muted); font-size: 0.8rem; }
.stat-value { font-size: 1.6rem; font-weight: 700; margin-top: 0.2rem; }
table { width: 100%; min-width: 640px; border-collapse: collapse; font-size: 0.88rem; }
th, td { text-align: left; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; }
tr:hover td { background: rgba(91,157,255,0.06); }

/* 모바일 대응 (재검토: 뷰포트는 있었지만 표 가로스크롤/좁은화면 최적화가 빠져있었음) */
@media (max-width: 640px) {
  header.topbar { padding: 0.7rem 1rem; gap: 0.8rem; }
  header.topbar h1 { font-size: 0.95rem; }
  header.topbar nav { gap: 0.6rem; }
  header.topbar nav a { font-size: 0.82rem; }
  main { padding: 0.8rem; }
  .card { padding: 0.9rem 0.8rem; border-radius: 8px; }
  table { min-width: 560px; font-size: 0.82rem; }
  th, td { padding: 0.4rem 0.45rem; }
  a.btn, button.btn { padding: 0.55rem 0.9rem; font-size: 0.85rem; }
  form.inline { flex-direction: column; align-items: stretch; }
  form.inline input, form.inline select, form.inline button { width: 100%; }
}
.badge {
  display: inline-block; padding: 0.15rem 0.5rem; border-radius: 999px;
  font-size: 0.72rem; font-weight: 600;
}
.badge.ok { background: rgba(46,204,113,0.15); color: var(--ok); }
.badge.warn { background: rgba(245,165,36,0.15); color: var(--warn); }
.badge.danger { background: rgba(240,79,79,0.15); color: var(--danger); }
.badge.muted { background: rgba(154,163,178,0.15); color: var(--muted); }
a.btn, button.btn {
  display: inline-block; background: var(--accent); color: #fff; border: none;
  padding: 0.5rem 1rem; border-radius: 6px; font-size: 0.85rem; cursor: pointer;
  text-decoration: none;
}
a.btn.secondary, button.btn.secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
.empty-state { color: var(--muted); padding: 2rem 0; text-align: center; }
.error-box {
  background: rgba(240,79,79,0.1); border: 1px solid rgba(240,79,79,0.4);
  border-radius: 8px; padding: 0.9rem 1.1rem; color: var(--danger); margin-bottom: 1rem;
  white-space: pre-wrap; font-size: 0.85rem;
}
form.inline { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; margin-bottom: 1rem; }
input, select, textarea {
  background: var(--bg); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; padding: 0.45rem 0.6rem; font-size: 0.85rem;
}
.muted { color: var(--muted); }
.small { font-size: 0.78rem; }