:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1d2330;
  --muted: #5b6472;
  --line: #e2e6ec;
  --brand: #2f6fed;
  --brand-dark: #2458c2;
  --danger: #c23b3b;
  --ok: #1f8a4c;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.5; font-size: 16px;
}
a { color: var(--brand); }
header.site {
  background: var(--card); border-bottom: 1px solid var(--line);
  padding: 12px 16px; display: flex; align-items: center; justify-content: space-between;
}
header.site .brand { font-weight: 700; text-decoration: none; color: var(--text); font-size: 18px; }
header.site nav a { margin-left: 14px; text-decoration: none; }
main.page { max-width: 480px; margin: 32px auto; padding: 0 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
h1 { font-size: 22px; margin: 0 0 16px; }
h2 { font-size: 18px; margin: 24px 0 8px; }
p.muted, .muted { color: var(--muted); }
label { display: block; font-weight: 600; margin: 14px 0 6px; }
input[type=text], input[type=email], input[type=password] {
  width: 100%; padding: 12px; border: 1px solid var(--line); border-radius: 8px; font-size: 16px; background: #fff;
}
input:focus { outline: 3px solid rgba(47,111,237,.35); border-color: var(--brand); }
.check { display: flex; align-items: flex-start; gap: 8px; margin: 10px 0; font-weight: 400; }
.check input { margin-top: 4px; width: 18px; height: 18px; }
button, .btn {
  display: inline-block; width: 100%; margin-top: 18px; padding: 12px 16px; border: 0; border-radius: 8px;
  background: var(--brand); color: #fff; font-size: 16px; font-weight: 600; cursor: pointer; text-align: center; text-decoration: none;
}
button:hover, .btn:hover { background: var(--brand-dark); }
button.secondary, .btn.secondary { background: #fff; color: var(--text); border: 1px solid var(--line); }
button.danger { background: #fff; color: var(--danger); border: 1px solid var(--danger); width: auto; margin: 0; padding: 6px 10px; font-size: 14px; }
button.link { background: none; color: var(--brand); width: auto; margin: 0; padding: 0; font-weight: 500; text-decoration: underline; }
.notice { padding: 12px 14px; border-radius: 8px; margin-bottom: 14px; }
.notice.ok { background: #e9f7ee; color: var(--ok); }
.notice.error { background: #fbeaea; color: var(--danger); }
.notice.info { background: #eaf0fd; color: var(--brand-dark); }
.field-error { color: var(--danger); font-size: 14px; margin-top: 4px; }
.links { margin-top: 18px; display: flex; justify-content: space-between; font-size: 15px; }
ul.devices { list-style: none; padding: 0; margin: 0; }
ul.devices li { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 0; border-top: 1px solid var(--line); }
ul.devices li:first-child { border-top: 0; }
ul.devices .meta { color: var(--muted); font-size: 14px; }
.badge { display: inline-block; background: #eaf0fd; color: var(--brand-dark); border-radius: 6px; padding: 1px 6px; font-size: 12px; margin-left: 6px; }
footer.site { max-width: 480px; margin: 24px auto 40px; padding: 0 16px; color: var(--muted); font-size: 13px; }
footer.site p { margin: 4px 0; }
code.trace { font-size: 18px; letter-spacing: 1px; background: #eef1f5; padding: 4px 8px; border-radius: 6px; }
.code-input { font-size: 28px; letter-spacing: 8px; text-align: center; }

/* ── 7단계: 운영자 화면 · 표 · 넓은 틀(인라인 스타일 금지 — CSP) ── */
main.page.wide { max-width: 1100px; }
.small { font-size: 13px; }
.inline { display: inline-block; margin: 0 4px 4px 0; }
.inline button, .inline-row button, .row button, button.small { width: auto; margin: 0; padding: 6px 10px; font-size: 14px; }
.inline input, .row input, .inline-row input { width: auto; padding: 6px 8px; font-size: 14px; }
.inline input.short, .row input.short { width: 110px; }
.row, .inline-row { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 10px 0; }
.row input[type=text], .row input[type=email] { flex: 1 1 180px; }
.select { padding: 8px; border: 1px solid var(--line); border-radius: 6px; font-size: 14px; background: #fff; }
.select.wide { width: 100%; padding: 12px; font-size: 16px; }
.select.small { padding: 6px; }
.actions { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.search input { width: 100%; padding: 12px; border: 1px solid var(--line); border-radius: 8px; font-size: 16px; }
.search button { width: auto; margin-top: 10px; }
table.grid { width: 100%; border-collapse: collapse; margin: 8px 0 16px; font-size: 14px; }
table.grid th, table.grid td { text-align: left; padding: 8px 6px; border-top: 1px solid var(--line); vertical-align: top; }
table.grid thead th { border-top: 0; color: var(--muted); font-weight: 600; }
table.grid.kv th { width: 140px; color: var(--muted); }
table.grid code { background: #eef1f5; padding: 1px 5px; border-radius: 4px; font-size: 13px; }
textarea { width: 100%; padding: 12px; border: 1px solid var(--line); border-radius: 8px; font-size: 15px; font-family: inherit; }
ul.plain { list-style: none; padding: 0; margin: 0 0 12px; }
ul.plain li { padding: 8px 0; border-top: 1px solid var(--line); }
ul.plain li:first-child { border-top: 0; }
.stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.stat { border: 1px solid var(--line); border-radius: 10px; padding: 12px; background: #fafbfc; }
.stat .num { font-size: 26px; font-weight: 700; }
.stat .label { color: var(--muted); font-size: 13px; }
nav.admin-nav { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin: 0 0 14px; font-size: 15px; }
nav.admin-nav a { text-decoration: none; }
nav.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
nav.tabs a { padding: 6px 12px; border: 1px solid var(--line); border-radius: 20px; text-decoration: none; color: var(--text); font-size: 14px; }
nav.tabs a.on { background: var(--brand); color: #fff; border-color: var(--brand); }
.form-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px 14px; align-items: end; }
.form-grid label { margin: 0; font-size: 14px; }
.form-grid input, .form-grid select { width: 100%; padding: 8px; border: 1px solid var(--line); border-radius: 6px; font-size: 14px; margin-top: 4px; }
.form-grid button { grid-column: 1 / -1; width: auto; justify-self: start; }
.sub-card { border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin: 10px 0; }
.sub-card .meta { color: var(--muted); font-size: 14px; margin-bottom: 6px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 20px 0; }