:root {
  --bg: #f5f6f8; --surface: #fff; --text: #1d2330; --muted: #6b7280; --line: #e3e6eb;
  --primary: #2f5bea; --primary-ink: #fff; --ok: #1f9d55; --warn: #c27c0e; --danger: #d64545;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418; --surface: #1a1f26; --text: #e6e8eb; --muted: #9aa3ae; --line: #2a313b;
    --primary: #5b7cfa; --ok: #3cc47c; --warn: #e3a33a; --danger: #ef6b6b;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.55 -apple-system, "Segoe UI", "Malgun Gothic", "Apple SD Gothic Neo", sans-serif; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.5rem; margin: .2em 0 .6em; }
h2 { font-size: 1.15rem; margin: 1.2em 0 .6em; }
h3 { font-size: 1rem; margin: 1em 0 .5em; }
code { background: var(--bg); padding: 1px 5px; border-radius: 4px; font-size: .9em; }
.wrap { max-width: 1100px; margin: 0 auto; padding: 0 16px; }
.main { padding-top: 20px; padding-bottom: 60px; }

.topbar { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 10; }
.topbar-in { display: flex; align-items: center; gap: 20px; height: 56px; }
.brand { font-weight: 800; font-size: 1.15rem; color: var(--text); letter-spacing: .02em; }
.nav { display: flex; gap: 16px; flex: 1; }
.nav a { color: var(--text); }
.me { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.me-name { color: var(--text); }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin-bottom: 16px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; margin-bottom: 16px; }
.cards .card { margin: 0; }
.course-card h3 { margin-top: 0; }
a.course-card { color: var(--text); display: block; }
a.course-card:hover { text-decoration: none; border-color: var(--primary); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.empty { color: var(--muted); text-align: center; }
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.crumb { margin: 0; font-size: .9rem; }

.btn { display: inline-block; border: 1px solid var(--line); background: var(--surface); color: var(--text);
  padding: 8px 14px; border-radius: 8px; cursor: pointer; font: inherit; line-height: 1.2; }
.btn:hover { text-decoration: none; border-color: var(--primary); }
.btn:disabled { opacity: .5; cursor: default; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-ghost { background: transparent; }
.btn-sm { padding: 5px 10px; font-size: .85rem; }
.btn-block { width: 100%; padding: 11px; }

.form { display: flex; flex-direction: column; gap: 12px; }
.form label { display: flex; flex-direction: column; gap: 4px; font-weight: 600; font-size: .9rem; }
.form label.check { flex-direction: row; align-items: center; gap: 8px; font-weight: 400; }
.form-row { flex-direction: row; flex-wrap: wrap; align-items: center; }
.form-row > input, .form-row > select { flex: 1 1 160px; }
input, select, textarea { font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 10px; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: -1px; }
.inline { display: inline-flex; gap: 6px; align-items: center; margin: 2px 0; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.auth-box { max-width: 440px; margin: 30px auto; }
.center { text-align: center; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.warn { color: var(--warn); }
.nowrap { white-space: nowrap; }
.prewrap { white-space: pre-wrap; }
.clamp { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.spacer { flex: 1; }

.role-pick { border: 0; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.role-pick legend { font-weight: 600; font-size: .9rem; margin-bottom: 6px; }
.role-opt { flex-direction: row !important; align-items: flex-start; gap: 8px !important; border: 1px solid var(--line);
  border-radius: 8px; padding: 10px; cursor: pointer; font-weight: 400 !important; }
.role-opt:has(input:checked) { border-color: var(--primary); background: color-mix(in srgb, var(--primary) 8%, transparent); }
.role-opt small { display: block; color: var(--muted); }

.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; border: 1px solid var(--line); background: var(--surface); }
.alert ul { margin: 0; padding-left: 18px; }
.alert-ok { border-color: var(--ok); color: var(--ok); }
.alert-error { border-color: var(--danger); color: var(--danger); }
.alert-info { border-color: var(--primary); }

.badge { display: inline-block; font-size: .75rem; padding: 2px 8px; border-radius: 99px; background: var(--bg);
  border: 1px solid var(--line); color: var(--muted); font-weight: 600; vertical-align: middle; }
.badge-ok { color: var(--ok); border-color: var(--ok); }
.badge-warn { color: var(--warn); border-color: var(--warn); }
.badge-admin { color: var(--danger); border-color: var(--danger); }
.badge-instructor { color: var(--primary); border-color: var(--primary); }

.bar { height: 8px; background: var(--bg); border-radius: 99px; overflow: hidden; border: 1px solid var(--line); }
.bar span { display: block; height: 100%; background: var(--primary); transition: width .3s; }

.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 9px 8px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
.table th { font-size: .82rem; color: var(--muted); font-weight: 600; }
.row-pending { background: color-mix(in srgb, var(--warn) 7%, transparent); }
.grid-table td.center, .grid-table th { text-align: center; }
.cell-ok { color: var(--ok); font-weight: 700; }
.cell-mid { color: var(--warn); }

.list { list-style: none; padding: 8px 18px; }
.list li { padding: 6px 0; }
.lessons { padding-left: 38px; }
.lessons li { padding: 8px 0; border-bottom: 1px solid var(--line); }
.lessons li:last-child { border-bottom: 0; }
.lessons a { display: flex; gap: 10px; align-items: center; color: var(--text); }
.lessons .lt { flex: 1; }
.kind { font-size: .72rem; padding: 2px 7px; border-radius: 5px; background: var(--bg); color: var(--muted); white-space: nowrap; }
.kind-live { color: var(--danger); }

.lesson-admin { padding-left: 22px; }
.lesson-admin > li { padding: 12px 0; border-bottom: 1px solid var(--line); }
.la-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.uploader { margin: 8px 0; display: flex; flex-direction: column; gap: 6px; }
.up-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.err { white-space: pre-wrap; background: var(--bg); padding: 8px; border-radius: 6px; color: var(--danger); max-height: 160px; overflow: auto; }
details.mini summary { cursor: pointer; color: var(--muted); font-size: .85rem; }
details.card summary { cursor: pointer; }
.danger-zone { border-color: var(--danger); }
.dl { display: grid; grid-template-columns: max-content 1fr; gap: 8px 16px; margin: 0; }
.dl dt { color: var(--muted); }
.dl dd { margin: 0; word-break: break-all; }

.player { position: relative; background: #000; border-radius: var(--radius); overflow: hidden; aspect-ratio: 16/9; user-select: none; }
.player video { width: 100%; height: 100%; display: block; background: #000; }
.player:fullscreen { border-radius: 0; aspect-ratio: auto; }
.watermark { position: absolute; pointer-events: none; color: rgba(255,255,255,.28); font-size: 14px; font-weight: 600;
  text-shadow: 0 0 2px rgba(0,0,0,.5); white-space: nowrap; transition: left 1s, top 1s; }
.fs-btn { position: absolute; right: 10px; top: 10px; background: rgba(0,0,0,.45); color: #fff; border: 0; border-radius: 6px;
  width: 34px; height: 34px; font-size: 18px; cursor: pointer; }
.player-meta { display: flex; align-items: center; gap: 10px; margin: 10px 0 16px; flex-wrap: wrap; }
.player-meta .bar { flex: 1 1 200px; }
.pager { display: flex; justify-content: space-between; gap: 10px; margin-top: 16px; }
.toast { position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%); background: #222; color: #fff; padding: 10px 16px;
  border-radius: 8px; opacity: 0; transition: opacity .2s; pointer-events: none; z-index: 50; }
.toast.show { opacity: 1; }

@media (max-width: 720px) {
  .grid2, .role-pick { grid-template-columns: 1fr; }
  .topbar-in { gap: 10px; }
  .nav { gap: 10px; font-size: .9rem; overflow-x: auto; }
  .me-name .badge { display: none; }
}

/* ---------- 실시간 강의 ---------- */
.badge-live { color: #fff; background: var(--danger); border-color: var(--danger); }
.live-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 16px; align-items: start; }
.live-player video { object-fit: contain; }
.live-overlay { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: #ddd;
  background: rgba(0,0,0,.55); text-align: center; padding: 20px; }
.live-overlay[hidden] { display: none; }
.live-controls { position: absolute; left: 0; right: 0; bottom: 0; display: flex; gap: 8px; padding: 8px;
  background: linear-gradient(transparent, rgba(0,0,0,.6)); }
.live-controls .btn, .live-controls select { background: rgba(0,0,0,.5); color: #fff; border-color: rgba(255,255,255,.3); }
.live-controls .btn[hidden] { display: none; }
.chat { display: flex; flex-direction: column; height: min(70vh, 560px); padding: 0; overflow: hidden; }
.chat-head { display: flex; gap: 10px; align-items: center; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.chat-head .check { margin-left: auto; display: flex; gap: 4px; align-items: center; }
.chat-list { flex: 1; overflow-y: auto; padding: 8px 12px; display: flex; flex-direction: column; gap: 8px; }
.chat-list.only-q .chat-msg:not(.is-q) { display: none; }
.chat-msg { position: relative; padding: 6px 28px 6px 10px; border-radius: 8px; background: var(--bg); word-break: break-word; }
.chat-msg small { color: var(--muted); display: block; }
.chat-msg.is-q { border-left: 3px solid var(--warn); }
.chat-msg.mine { background: color-mix(in srgb, var(--primary) 12%, transparent); }
.chat-hide { position: absolute; right: 4px; top: 4px; border: 0; background: none; color: var(--muted); cursor: pointer; font-size: 16px; }
.chat-form { display: flex; gap: 6px; align-items: center; padding: 8px; border-top: 1px solid var(--line); }
.chat-form input:not([type]) { flex: 1; min-width: 0; }
.chat-form .check { display: flex; gap: 3px; align-items: center; white-space: nowrap; }

.studio-status { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.onair { font-weight: 800; padding: 3px 10px; border-radius: 6px; background: var(--bg); border: 1px solid var(--line); color: var(--muted); }
.onair.live { background: var(--danger); border-color: var(--danger); color: #fff; }
.studio-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 16px; align-items: start; }
.program-wrap { background: #000; border-radius: var(--radius); overflow: hidden; }
.program-wrap canvas { width: 100%; height: auto; display: block; }
.studio-actions { display: flex; gap: 10px; align-items: center; margin: 12px 0 4px; flex-wrap: wrap; }
.studio-actions [hidden] { display: none; }
.src-add { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.sources { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; margin: 12px 0; }
.src-card { border: 2px solid var(--line); border-radius: 8px; padding: 6px; display: flex; flex-direction: column; gap: 6px; }
.src-card.is-main { border-color: var(--danger); }
.src-card.is-pip { border-color: var(--primary); }
.src-card.is-main .src-btns [data-a="main"] { background: var(--danger); color: #fff; border-color: var(--danger); }
.src-card.is-pip .src-btns [data-a="pip"] { background: var(--primary); color: #fff; border-color: var(--primary); }
.src-thumb video { width: 100%; aspect-ratio: 16/9; background: #000; border-radius: 4px; object-fit: contain; display: block; }
.src-meta { display: flex; gap: 6px; align-items: baseline; }
.src-btns { display: flex; gap: 4px; flex-wrap: wrap; align-items: center; }
.src-btns .check { display: flex; gap: 3px; align-items: center; }
.layout-row { display: flex; gap: 12px; flex-wrap: wrap; }
.layout-row label { display: flex; gap: 6px; align-items: center; }
.meter { flex: 1 1 120px; height: 8px; background: var(--bg); border: 1px solid var(--line); border-radius: 99px; overflow: hidden; }
.meter span { display: block; height: 100%; width: 0; background: var(--ok); transition: width .08s; }
.people { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.people li { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.qr-dialog { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--text); max-width: 360px; }
.qr-dialog #qrBox svg { width: 100%; height: auto; background: #fff; }

.cam-body { background: #000; }
.cam-page { position: fixed; inset: 0; color: #fff; }
.cam-page video { width: 100%; height: 100%; object-fit: cover; background: #111; }
.cam-top { position: absolute; top: 0; left: 0; right: 0; display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px; background: linear-gradient(rgba(0,0,0,.6), transparent); }
.cam-panel { position: absolute; left: 16px; right: 16px; bottom: 24px; background: rgba(20,20,20,.9); border-radius: 12px;
  padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.cam-panel label { display: flex; flex-direction: column; gap: 4px; font-size: .9rem; }
.cam-panel label.check { flex-direction: row; align-items: center; }
.cam-opts { display: flex; gap: 14px; flex-wrap: wrap; }
.cam-bottom { position: absolute; left: 0; right: 0; bottom: 24px; display: flex; justify-content: center; gap: 12px; }
.cam-panel[hidden], .cam-bottom[hidden] { display: none; }

@media (max-width: 900px) {
  .live-layout, .studio-grid { grid-template-columns: 1fr; }
  .chat { height: 420px; }
}

/* ---------- 모니터링 ---------- */
.mon-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.mon-grid .card { margin: 0; }
.mon-links { margin-top: 12px; }
.mon-link { align-items: flex-start !important; border-top: 1px solid var(--line); padding-top: 8px; }
@media (max-width: 900px) { .mon-grid { grid-template-columns: 1fr; } }
/* ---------- 소리 채널 ---------- */
.audio-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; padding: 8px 0; border-bottom: 1px solid var(--line); }
.audio-row:last-of-type { border-bottom: 0; }
.audio-name { min-width: 92px; }
.vol { display: flex; gap: 4px; align-items: center; font-size: .8rem; color: var(--muted); }
.vol input { width: 90px; }
.help-list { margin: 6px 0 0; padding-left: 18px; }

/* 비밀번호 보기 버튼 (static/password.js) */
.pw-field { position: relative; display: flex; }
.pw-field > input { flex: 1; min-width: 0; padding-right: 64px; }
.pw-toggle { position: absolute; right: 4px; top: 50%; transform: translateY(-50%); padding: 4px 10px;
  font: inherit; font-size: .8rem; font-weight: 600; color: var(--muted); background: transparent;
  border: 0; border-radius: 6px; cursor: pointer; }
.pw-toggle:hover, .pw-toggle[aria-pressed="true"] { color: var(--primary); }
.pw-toggle:focus-visible { outline: 2px solid var(--primary); }
.pw-warn { color: var(--warn); font-weight: 400; }

/* 영상 일괄 추가 */
.bulk-list { padding-left: 20px; }
.bulk-list li { margin: 6px 0; }
.bulk-list .bar { margin-top: 4px; }
.node-inbox { margin-top: 12px; padding: 12px; border: 1px dashed var(--line); border-radius: var(--radius); }
.node-inbox h4 { margin: 0 0 6px; }
.node-inbox code { word-break: break-all; }

/* 강의 화면 보호 (static/protect.js) */
.wm-tile { position: absolute; inset: 0; pointer-events: none; background-repeat: repeat; z-index: 2; }
.player .watermark { z-index: 3; }
.shield { position: absolute; inset: 0; z-index: 10; background: #000; color: #cfd6df; display: flex;
  align-items: center; justify-content: center; text-align: center; font-size: .95rem; cursor: pointer; }
.shield b { font-size: 1.1rem; color: #fff; }
@media print {
  .player, .live-player, .live-layout { display: none !important; }
  main::before { content: "강의 화면은 인쇄할 수 없습니다."; }
}