:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --border: #e2e5ea;
  --text: #1b1f24;
  --muted: #6b7280;
  --accent: #2563eb;
  --danger: #dc2626;
  --warn: #d97706;
  --ok: #059669;
  --hover: #f0f3f8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --panel: #171a20;
    --border: #262b33;
    --text: #e6e8ec;
    --muted: #9aa3af;
    --accent: #60a5fa;
    --danger: #f87171;
    --warn: #fbbf24;
    --ok: #34d399;
    --hover: #1e232b;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }   /* main{display:grid} 등이 hidden을 덮어쓰지 않도록 */
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  /* 브라우저 높이에 정확히 맞춰 페이지 자체는 스크롤되지 않게 한다 */
  height: 100vh; height: 100dvh; overflow: hidden;
  display: flex; flex-direction: column;
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard",
        "Malgun Gothic", system-ui, sans-serif;
}
button { font: inherit; cursor: pointer; border-radius: 8px; border: 1px solid var(--border); white-space: nowrap; }
button.primary { background: var(--accent); color: #fff; border-color: transparent; padding: 7px 14px; }
button.ghost { background: transparent; color: var(--text); padding: 6px 12px; }
button.ghost:hover { background: var(--hover); }
button.danger { background: transparent; color: var(--danger); border-color: var(--danger); padding: 6px 12px; }
button.small { padding: 3px 9px; font-size: 12px; }
input, select {
  font: inherit; color: var(--text); background: var(--panel);
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 9px;
}
.muted { color: var(--muted); }
.small { font-size: 12px; }
.spacer { flex: 1; }
.row { display: flex; align-items: center; gap: 8px; }
a { color: var(--accent); }

.banner {
  padding: 10px 16px; font-size: 13px; line-height: 1.5;
  background: #fee2e2; color: #991b1b; border-bottom: 1px solid #fca5a5;
  word-break: break-word;
}
.banner-hint { margin-top: 6px; font-weight: 600; }
@media (prefers-color-scheme: dark) {
  .banner { background: #450a0a; color: #fecaca; border-bottom-color: #7f1d1d; }
}

.topbar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px; background: var(--panel);
  border-bottom: 1px solid var(--border);
  z-index: 5; flex-wrap: wrap; flex: 0 0 auto;
}
.back-btn { flex-shrink: 0; font-weight: 600; }

.brand {
  display: flex; align-items: center; gap: 9px;
  font-size: 15px; white-space: nowrap; flex-shrink: 0;
  background: transparent; border: 0; color: var(--text); padding: 4px 6px;
}
.brand:hover { background: var(--hover); }
.brand-logo { height: 20px; width: auto; display: block; }
.brand-logo.dark { display: none; }
/* 어두운 배경에서는 글자만 밝게 만든 전용 로고로 교체 (빨간 점은 원본 그대로) */
@media (prefers-color-scheme: dark) {
  .brand-logo.light { display: none; }
  .brand-logo.dark { display: block; }
}
.acct {
  color: var(--muted); font-size: 13px; margin-right: 4px;
  max-width: 32vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* 로그인 화면의 로고 */
.welcome-brand {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  margin-bottom: 22px; padding-bottom: 20px; border-bottom: 1px solid var(--border);
}
.brand-logo.lg { height: 40px; }
.welcome-app {
  font-size: 17px; font-weight: 600; color: var(--muted);
  padding-left: 14px; border-left: 1px solid var(--border);
}

/* 설정 화면 */
.setup { max-width: 720px; margin: 40px auto; padding: 0 20px 60px; overflow: auto; }
.setup h1 { font-size: 22px; }
.steps { line-height: 2; padding-left: 20px; }
.copybox {
  display: flex; gap: 8px; align-items: center; margin-top: 6px;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 10px;
}
.copybox code { flex: 1; word-break: break-all; font-size: 13px; }
.form { display: flex; flex-direction: column; gap: 12px; margin-top: 20px; }
.form label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; }
.form label.row { flex-direction: row; align-items: center; }
.form input[type="checkbox"] { width: auto; }

/* 레이아웃: 폴더 | 목록 | 읽기 패널 */
main {
  display: grid;
  grid-template-columns: 280px minmax(340px, 1fr) minmax(380px, 1.05fr);
  flex: 1 1 auto; min-height: 0;
}
.sidebar {
  border-right: 1px solid var(--border); background: var(--panel);
  display: flex; flex-direction: column; padding: 12px; gap: 8px; overflow: hidden;
}
.side-head { display: flex; justify-content: space-between; align-items: baseline; }
.side-actions { display: flex; gap: 6px; }
.search { width: 100%; }
.tree { overflow: auto; flex: 1; margin: -2px; padding: 2px; }

.fnode {
  display: flex; align-items: center; gap: 6px;
  padding: 4px 6px; border-radius: 6px; white-space: nowrap;
}
.fnode:hover { background: var(--hover); }
.fnode .fname {
  flex: 1; overflow: hidden; text-overflow: ellipsis; text-align: left;
  background: transparent; border: 0; color: inherit; padding: 2px 4px; font: inherit;
}
.fnode.on { background: var(--hover); }
.fnode.on .fname { color: var(--accent); font-weight: 600; }
.fnode .cnt { color: var(--muted); font-size: 12px; }
.fnode .cnt.has { color: var(--accent); font-weight: 600; }
.fnode .sub { opacity: 0; }
.fnode:hover .sub { opacity: 1; }

.content { display: flex; flex-direction: column; overflow: hidden; }
.toolbar {
  display: flex; gap: 8px; align-items: center; flex-wrap: wrap;
  padding: 10px 16px; border-bottom: 1px solid var(--border); background: var(--panel);
}
.toolbar .search { width: 200px; }
.status { padding: 8px 16px; color: var(--muted); font-size: 13px; }
.status.err { color: var(--danger); }
.list { overflow: auto; padding: 0 16px 40px; }

.group-title {
  position: sticky; top: 0; background: var(--bg); z-index: 1;
  padding: 10px 2px 6px; font-weight: 600; font-size: 13px; color: var(--muted);
  display: flex; align-items: center; gap: 8px;
}
.group-title input { flex-shrink: 0; }
.group-label { cursor: pointer; user-select: none; }
.group-label:hover { color: var(--text); }
.msg {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 12px; margin-bottom: 8px;
}
.msg.isread { opacity: .55; }
.msg.danger { border-left: 3px solid var(--danger); }
.msg.suspect { border-left: 3px solid var(--warn); }
.msg-head { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.msg-from { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.msg-addr { color: var(--muted); font-size: 12px; overflow-wrap: anywhere; }
.msg-date { color: var(--muted); font-size: 12px; margin-left: auto; white-space: nowrap; }
.msg-subj { margin: 3px 0; cursor: pointer; }
.msg-prev { color: var(--muted); font-size: 13px; overflow: hidden;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.msg-foot { display: flex; gap: 6px; align-items: center; margin-top: 8px; flex-wrap: wrap; }

.badge {
  font-size: 11px; padding: 1px 7px; border-radius: 999px;
  border: 1px solid var(--border); color: var(--muted);
}
.badge.clean { color: var(--ok); border-color: var(--ok); }
.badge.suspect { color: var(--warn); border-color: var(--warn); }
.badge.danger { color: var(--danger); border-color: var(--danger); }
.reasons { font-size: 12px; color: var(--muted); margin-top: 6px; }
.body-box {
  margin-top: 8px; padding: 10px; background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px;
  white-space: pre-wrap; word-break: break-word; max-height: 320px; overflow: auto; font-size: 13px;
}

dialog {
  border: 1px solid var(--border); border-radius: 12px; background: var(--panel);
  color: var(--text); max-width: 560px; width: calc(100% - 32px); padding: 20px;
}
dialog::backdrop { background: rgba(0,0,0,.45); }
dialog h2 { margin: 0 0 12px; font-size: 17px; }
.dlg-actions { display: flex; gap: 8px; margin-top: 16px; }
.tabs { display: flex; gap: 6px; margin-bottom: 12px; }
.tab { background: transparent; color: var(--muted); padding: 5px 10px; }
.tab.active { color: var(--text); border-color: var(--accent); }
.tabpane .row { margin: 10px 0; }
.tabpane .row input { flex: 1; }
.rulelist { list-style: none; margin: 8px 0 0; padding: 0; max-height: 240px; overflow: auto; }
.rulelist li {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 4px; border-bottom: 1px solid var(--border); font-size: 13px;
}
.rulelist li .spacer { flex: 1; }

/* 상단 카운터 */
.count-pill {
  background: var(--accent); color: #fff; font-size: 12px; font-weight: 600;
  padding: 3px 10px; border-radius: 999px; white-space: nowrap;
}

/* 폴더별 개수 칩 */
.chips {
  display: flex; gap: 6px; flex-wrap: wrap;
  padding: 8px 16px 0;
}
.chip {
  background: var(--panel); color: var(--muted); font-size: 12px;
  padding: 3px 10px; border-radius: 999px; border: 1px solid var(--border);
}
.chip:hover { background: var(--hover); }
.chip.on { background: var(--accent); color: #fff; border-color: transparent; }
.chip.clear { border-style: dashed; }

/* 폴더 트리 접기 버튼 */
.twisty {
  border: 0; background: transparent; color: var(--muted);
  width: 16px; padding: 0; font-size: 11px; line-height: 1; flex-shrink: 0;
}
.twisty.empty { visibility: hidden; }

/* 번역 결과 */
.transbox {
  border: 1px solid var(--accent); border-radius: 8px; padding: 10px;
  margin-bottom: 10px; background: var(--panel);
}
.transbox-head { display: flex; gap: 8px; align-items: center; margin-bottom: 6px; }
.transbox-text {
  white-space: pre-wrap; word-break: break-word; font-size: 13px;
  max-height: 320px; overflow: auto;
}
.compose-trans { flex-wrap: wrap; }
.compose-files { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.attach-list { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.attach-item {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 6px 3px 10px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--panel); font-size: 12px;
}
.attach-item button {
  border: 0; background: transparent; color: var(--muted); padding: 0 3px; line-height: 1;
}
.attach-item button:hover { color: var(--danger); }
.attach-item.busy { opacity: .6; }

/* 선택 일괄 처리 바 */
.bulkbar {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 8px 16px; background: var(--hover); border-bottom: 1px solid var(--border);
}

/* 목록의 체크박스 */
.msg { display: flex; gap: 10px; align-items: flex-start; }
.msg > .msg-check { margin-top: 3px; flex-shrink: 0; }
.msg > .msg-main { flex: 1; min-width: 0; }
.msg.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }

/* 읽기 패널 */
/* 패널 자체는 스크롤하지 않고, 본문 iframe 안에서만 스크롤되게 한다 */
.reader {
  border-left: 1px solid var(--border); background: var(--panel);
  display: flex; flex-direction: column; overflow: hidden;
  padding: 14px 16px; min-height: 0;
}
#reader-body { display: flex; flex-direction: column; flex: 1; min-height: 0; }
.reader-empty { padding: 40px 0; text-align: center; }
.reader-head { position: relative; }
.reader-head h2 { font-size: 17px; margin: 0 28px 6px 0; word-break: break-word; }
#reader-close { position: absolute; top: 0; right: 0; }
.rd-meta { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; font-size: 13px; }
.rd-attach { margin-top: 6px; color: var(--muted); }
.reader-actions {
  display: flex; gap: 6px; align-items: center; flex-wrap: wrap;
  margin: 12px 0; padding-bottom: 10px; border-bottom: 1px solid var(--border);
}
.imgwarn {
  background: var(--hover); border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 10px; margin-bottom: 10px; display: flex; gap: 8px;
  align-items: center; flex-wrap: wrap; color: var(--muted);
}
.rd-frame {
  width: 100%; flex: 1 1 auto; min-height: 0; border: 0;
  background: #fff; border-radius: 8px; display: block;
}
/* 머리말·버튼 줄은 고정, 본문만 늘어난다 */
.reader-head, .reader-actions, .imgwarn, .transbox, .compose { flex: 0 0 auto; }
.compose { max-height: 55%; overflow: auto; }

/* 서명 편집기 */
.sig-editor { display: flex; flex-direction: column; gap: 6px; }
.sig-toolbar {
  display: flex; gap: 4px; align-items: center; flex-wrap: wrap;
  padding: 6px; border: 1px solid var(--border); border-radius: 8px 8px 0 0;
  background: var(--bg); margin-bottom: -7px;
}
.sig-toolbar select { padding: 3px 6px; font-size: 12px; }
.sig-toolbar input[type="color"] {
  width: 28px; height: 26px; padding: 2px; border-radius: 6px; background: var(--panel);
}
.sig-body {
  border: 1px solid var(--border); border-radius: 0 0 8px 8px; background: var(--panel);
  padding: 10px; min-height: 110px; max-height: 260px; overflow: auto;
  font: 11pt/1.5 Calibri, '맑은 고딕', 'Malgun Gothic', sans-serif; color: #1F3864;
}
.sig-body:focus { outline: 2px solid var(--accent); outline-offset: -2px; }
.sig-body img { max-width: 100%; }
.sig-src {
  font: 12px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
  border: 1px solid var(--border); border-radius: 0 0 8px 8px;
  background: var(--panel); color: var(--text); padding: 10px; width: 100%; resize: vertical;
}

/* 첨부파일 */
.rd-attach { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 8px; }
.attach-chip {
  display: inline-flex; align-items: center; gap: 4px; max-width: 260px;
  padding: 3px 10px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--panel); color: var(--text); font-size: 12px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.attach-chip:hover { background: var(--hover); }
.attach-chip.on { border-color: var(--accent); color: var(--accent); }

.previewbox {
  border: 1px solid var(--accent); border-radius: 8px; margin-bottom: 10px;
  background: var(--panel); overflow: hidden; flex: 0 0 auto;
}
.previewbox-head {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 8px 10px; border-bottom: 1px solid var(--border); font-size: 13px;
}
.previewbox-body { padding: 10px; max-height: 46vh; overflow: auto; }
.preview-img { max-width: 100%; height: auto; display: block; border-radius: 4px; }
.preview-frame { width: 100%; height: 44vh; border: 0; background: #fff; }
.preview-text {
  margin: 0; white-space: pre-wrap; word-break: break-word;
  font: 12.5px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* 작성 영역 */
.compose {
  margin-top: 14px; border-top: 1px solid var(--border); padding-top: 12px;
  display: flex; flex-direction: column; gap: 8px;
}
.compose-head { display: flex; align-items: center; gap: 8px; }
.compose label { display: flex; flex-direction: column; gap: 3px; }
.compose input, .compose textarea {
  font: inherit; color: var(--text); background: var(--panel);
  border: 1px solid var(--border); border-radius: 8px; padding: 7px 9px; width: 100%;
}
.compose textarea { resize: vertical; min-height: 120px; }
.compose-foot { display: flex; align-items: center; gap: 8px; }

/* 좁은 화면: 읽기 패널을 오버레이로 */
@media (max-width: 1100px) {
  main { grid-template-columns: 260px 1fr; }
  .reader {
    position: fixed; top: 0; right: 0; z-index: 20;
    width: min(560px, 100%); height: 100%;
    box-shadow: -8px 0 24px rgba(0, 0, 0, .18);
    transform: translateX(100%); transition: transform .18s ease;
  }
  .reader.open { transform: none; }
}

@media (max-width: 820px) {
  body { height: auto; overflow: visible; display: block; }
  main { grid-template-columns: 1fr; height: auto; }
  .sidebar { max-height: 280px; }
  .topbar { position: sticky; top: 0; }
}

@media (max-width: 560px) {
  .topbar { padding: 8px 10px; gap: 6px; }
  .acct { display: none; }              /* 좁은 화면에서는 계정 주소 숨김 */
  .brand { font-size: 14px; }
  .toolbar { padding: 8px 10px; }
  .toolbar .search { width: 100%; }
  .list { padding: 0 10px 40px; }
  .msg-date { margin-left: 0; }
}