:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --fg: #16181d;
  --muted: #6b7280;
  --line: #e3e6eb;
  --primary: #1f6feb;
  --primary-fg: #ffffff;
  --danger: #d1242f;
  --ok: #1a7f37;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #171a21;
    --fg: #e6e8ec;
    --muted: #9aa1ad;
    --line: #262b34;
    --primary: #4b8ff5;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 520px;
  margin: 0 auto;
  padding: 20px 16px 8px;
}

.foot {
  max-width: 520px;
  margin: 0 auto;
  padding: 16px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

/* ---------------------------------------------------------- typography */
h1, h2, h3 { margin: 0; font-weight: 700; }
.brand { font-size: 22px; margin-bottom: 4px; }
.title { font-size: 20px; }
.section { font-size: 15px; margin: 24px 0 10px; }
.section.small { margin: 0 0 10px; font-size: 14px; color: var(--muted); }
.lead { margin: 14px 0 10px; color: var(--muted); }
.muted { color: var(--muted); margin: 4px 0; }
.small { font-size: 13px; }
.hint { margin-top: 12px; color: var(--muted); font-size: 13px; }
.note { margin: 0 0 16px; white-space: pre-wrap; }
.empty { color: var(--muted); padding: 24px 4px; text-align: center; }
.off { color: var(--danger); }
.code { font-size: 40px; font-weight: 700; color: var(--muted); margin: 0; }
.hash, code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  color: var(--muted);
  word-break: break-all;
  margin: 0;
}

/* ---------------------------------------------------------- layout */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; gap: 6px; flex-wrap: wrap; }
.row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px;
  margin: 16px 0;
}
.card.center { text-align: center; margin-top: 12vh; }

/* ---------------------------------------------------------- list */
.list { list-style: none; margin: 0; padding: 0; }
.item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 10px;
}
.item-main { min-width: 0; }
.item-title { margin: 0; font-weight: 600; }

.meta { margin: 0 0 12px; }
.meta > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
}
.meta dt { color: var(--muted); font-size: 14px; }
.meta dd { margin: 0; font-weight: 600; text-align: right; word-break: break-all; }

/* ---------------------------------------------------------- form */
.form { display: flex; flex-direction: column; gap: 12px; margin-top: 12px; text-align: left; }
.form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: var(--muted); }

input[type="text"], input[type="number"], input[type="file"], select {
  width: 100%;
  padding: 13px 14px;
  font-size: 16px;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
}
input[type="text"]:focus, input[type="number"]:focus, select:focus {
  outline: 2px solid var(--primary);
  outline-offset: -1px;
}

/* 배포코드 입력: 구분 + PIN 두 칸 */
.codebox { display: flex; align-items: flex-end; gap: 8px; }
.codebox-field { flex: 1 1 auto; min-width: 0; gap: 6px; }
.codebox-field.pin { flex: 0 0 96px; }
.codebox-label { font-size: 13px; color: var(--muted); }
.codebox-plus {
  flex: 0 0 auto;
  padding-bottom: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--muted);
}
.codebox input { text-align: center; letter-spacing: .06em; }
.codebox-field input[name="identifier"] { text-transform: uppercase; }
.codebox-field.pin input { letter-spacing: .3em; text-indent: .3em; }

.checks { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin: 0; }
.checks legend { color: var(--muted); font-size: 14px; padding: 0 6px; }
.check {
  display: flex !important;
  flex-direction: row !important;
  align-items: center;
  gap: 8px;
  color: var(--fg) !important;
  padding: 5px 0;
}
.check input { width: 18px; height: 18px; }

/* ---------------------------------------------------------- button */
.btn {
  display: inline-block;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  color: var(--fg);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-fg); }
.btn.ghost { background: transparent; }
.btn.small { padding: 8px 12px; font-size: 13px; white-space: nowrap; }
.btn.block { display: block; width: 100%; margin: 16px 0 4px; }
.btn:active { opacity: .8; }

/* ---------------------------------------------------------- status */
.alert, .ok {
  margin: 12px 0 0;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
  text-align: left;
}
.alert { background: rgba(209, 36, 47, .1); color: var(--danger); }
.ok { background: rgba(26, 127, 55, .1); color: var(--ok); }

/* 관리자: 설명자료 목록 한 줄 (제목 수정 + 삭제) */
.media-row {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 10px;
}
.media-actions { display: flex; gap: 8px; margin-top: 8px; }
.media-title-form { display: flex; gap: 8px; flex: 1 1 auto; min-width: 0; }
.media-title-form input { flex: 1 1 auto; min-width: 0; padding: 8px 10px; font-size: 14px; }

.media {
  display: block;
  width: 100%;
  max-height: 60vh;
  margin: 10px 0;
  border-radius: 10px;
  object-fit: contain;
}
video.media { background: #000; }
img.media { background: var(--bg); cursor: zoom-in; }

.qr {
  display: block;
  width: 200px;
  max-width: 100%;
  margin: 12px auto 0;
  background: #fff;
  padding: 8px;
  border-radius: 8px;
}