:root {
  --bg: #0f1419;
  --panel: #171d24;
  --panel-2: #1d242d;
  --border: #2a333e;
  --text: #e6edf3;
  --muted: #8b98a5;
  --accent: #3b82f6;
  --accent-2: #2563eb;
  --danger: #ef4444;
  --ok: #22c55e;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 -apple-system, "Segoe UI", Roboto, "Noto Sans KR", sans-serif;
}

.topbar {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
.topbar h1 { font-size: 17px; margin: 0; }

.layout {
  display: grid;
  grid-template-columns: 320px minmax(320px, 1fr) minmax(360px, 1.2fr);
  gap: 12px;
  padding: 12px;
  height: calc(100vh - 52px);
}
.col { min-width: 0; display: flex; flex-direction: column; gap: 12px; overflow: hidden; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
  overflow: hidden;
}
.col-left .card:first-child { flex: 0 0 auto; }
.col-left .card:last-child { flex: 1 1 auto; overflow-y: auto; }
.col-mid .card, .col-right .card { flex: 1 1 auto; }

.card-title { font-weight: 600; font-size: 13px; letter-spacing: .3px; }
.card-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.card-head .card-title { margin-right: auto; }

textarea {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  font: 12px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
  resize: vertical;
}
textarea:focus { outline: none; border-color: var(--accent); }

.row { display: flex; gap: 8px; }
button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 12px;
  cursor: pointer;
  font-size: 13px;
}
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { background: var(--accent-2); }
button.small-btn { padding: 4px 9px; font-size: 12px; }
button.danger { color: var(--danger); }
button:disabled { opacity: .5; cursor: not-allowed; }

.muted { color: var(--muted); }
.small { font-size: 12px; }
.pad { padding: 10px; }
.badge {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0 8px;
  font-size: 12px;
  color: var(--muted);
}

.account-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.account-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  background: var(--panel-2);
}
.account-item:hover { border-color: var(--accent); }
.account-item.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.account-item .email { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); flex: 0 0 auto; }
.dot.ok { background: var(--ok); }
.dot.error { background: var(--danger); }

.tabs { display: flex; gap: 6px; }
.tab { padding: 4px 10px; font-size: 12px; border-radius: 999px; }
.tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.message-list { overflow-y: auto; display: flex; flex-direction: column; gap: 4px; }
.msg-item {
  padding: 8px 10px;
  border: 1px solid transparent;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  border-radius: 6px;
}
.msg-item:hover { background: var(--panel-2); }
.msg-item.active { background: var(--panel-2); border-color: var(--accent); }
.msg-item.unread .msg-subject { font-weight: 700; }
.msg-top { display: flex; gap: 8px; align-items: baseline; }
.msg-from { color: var(--muted); font-size: 12px; flex: 0 0 auto; max-width: 40%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg-subject { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; }
.msg-date { color: var(--muted); font-size: 11px; flex: 0 0 auto; }
.msg-preview { color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.detail { overflow-y: auto; min-height: 0; flex: 1; }
.detail-head { border-bottom: 1px solid var(--border); padding-bottom: 8px; margin-bottom: 10px; }
.detail-subject { font-size: 16px; font-weight: 650; margin-bottom: 6px; word-break: break-word; }
.detail-meta { font-size: 12px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 4px 12px; }
.detail-body {
  background: #fff;
  color: #111;
  border-radius: 8px;
  padding: 10px;
  overflow: auto;
}
.detail-body iframe { width: 100%; min-height: 420px; border: 0; background: #fff; }

/* 프로토콜 선택 */
.proto-row { align-items: center; gap: 16px; margin-top: 2px; }
.proto-label {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12px; color: var(--text); cursor: pointer; user-select: none;
}
.proto-label input { accent-color: var(--accent); cursor: pointer; }

/* 상단 행(제목 + 외부리소스 토글) */
.detail-head-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }

/* 외부 리소스 차단 안내/확인 */
.remote-ask {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  margin: 8px 0; padding: 8px 10px;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid var(--danger);
  border-radius: 8px;
  font-size: 12px; color: var(--text);
}
.remote-ask button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }

.spinner {
  width: 15px; height: 15px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

.toast {
  position: fixed;
  bottom: 18px; left: 50%;
  transform: translateX(-50%);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 14px;
  font-size: 13px;
  z-index: 50;
  max-width: 80vw;
}
.toast.error { border-color: var(--danger); }
.toast.hidden, .hidden { display: none; }

@media (max-width: 1100px) {
  .layout { grid-template-columns: 1fr; height: auto; }
  .col { overflow: visible; }
}