:root { color-scheme: light dark; --bg: #f5f7fb; --card: #ffffff; --text: #1b2330; --muted: #5b6676; --accent: #1f6feb; --line: #dde3ec; --danger: #c62828; --ok: #1b7f3b; }
@media (prefers-color-scheme: dark) { :root { --bg: #0f141b; --card: #18202b; --text: #e6ebf2; --muted: #9aa6b6; --accent: #4c8dff; --line: #2a3442; --danger: #ff6b6b; --ok: #5fd08a; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: "Malgun Gothic", "Apple SD Gothic Neo", system-ui, sans-serif; line-height: 1.6; }
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 48px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 24px; margin-bottom: 16px; }
h1 { margin: 0 0 4px; font-size: 1.5rem; }
h2 { margin: 0 0 12px; font-size: 1.15rem; }
.lead { margin: 0 0 20px; color: var(--muted); }
label { display: block; margin: 12px 0 4px; font-weight: 700; font-size: 0.95rem; }
input[type="text"], input[type="password"] { width: 100%; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--text); font-size: 1rem; }
.check { display: flex; align-items: center; gap: 8px; margin-top: 12px; font-weight: 400; }
button, .button { display: inline-block; margin-top: 16px; padding: 10px 18px; border: 0; border-radius: 8px; background: var(--accent); color: #fff; font-weight: 700; font-size: 1rem; cursor: pointer; text-decoration: none; }
button.secondary { background: transparent; color: var(--text); border: 1px solid var(--line); }
button.small { margin: 0 6px 0 0; padding: 4px 10px; font-size: 0.85rem; }
button.danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
button:disabled { opacity: 0.5; cursor: default; }
.message { margin-top: 12px; min-height: 1.4em; font-size: 0.95rem; }
.message.error { color: var(--danger); }
.message.ok { color: var(--ok); }
.muted { color: var(--muted); font-size: 0.9rem; }
.row { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
table { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 0.95rem; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--line); font-size: 0.8rem; color: var(--muted); }
.tag.off { color: var(--danger); border-color: var(--danger); }
[hidden] { display: none !important; }
footer { margin-top: 16px; text-align: center; color: var(--muted); font-size: 0.85rem; }
footer a { color: var(--muted); }
code { word-break: break-all; }
/* 관리자 화면: 로그인 뒤에는 왼쪽(상담원 계정) · 오른쪽(등록 PC, 연결 기록) 2단. 좁은 화면에서는 1단. */
main.admin:has(#list-card:not([hidden])) { max-width: 1480px; }
.columns .card { overflow-x: auto; }
@media (min-width: 1100px) {
  main.admin:has(#list-card:not([hidden])) .columns { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 16px; align-items: start; }
}