:root {
  --blue: #2670e6;
  --blue-dark: #1b5cc4;
  --bg: #f4f6f8;
  --panel: #ffffff;
  --line: #e4e8ee;
  --text: #1f2329;
  --mute: #6b7280;
  --unread: #0b57d0;
  --danger: #c9372c;
  --ok: #0d7a4f;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.hidden { display: none !important; }
.flash { padding: 8px 10px; border-radius: 6px; margin: 0 0 12px; }
.flash.bad { background: #fde8e6; color: var(--danger); }
.empty { color: var(--mute); padding: 24px; }
.hint { color: var(--mute); font-size: 12px; line-height: 1.5; }
.btn {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 6px;
  padding: 7px 12px;
  cursor: pointer;
  font: inherit;
}
.btn.primary { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn.compose { width: 100%; background: var(--blue); color: #fff; border: 0; padding: 10px; margin-bottom: 16px; font-weight: 600; }
.btn.ghost { display: block; text-align: center; text-decoration: none; color: var(--blue); margin-top: 12px; }
.row { display: flex; gap: 8px; align-items: center; }

.login-view {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, #eaf2ff, #f4f6f8 55%);
}
.login-panel {
  width: min(440px, calc(100% - 24px));
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 12px 40px rgba(31, 35, 41, 0.08);
}
.brand-en { margin: 0; color: var(--blue); letter-spacing: 0.12em; font-size: 11px; }
.login-panel h1 { margin: 6px 0 8px; font-size: 24px; }
.login-lead { color: var(--mute); margin-top: 0; }
.login-tabs { display: flex; gap: 6px; margin: 16px 0; }
.login-tab { flex: 1; }
.login-tab.active { background: #e8f1ff; border-color: var(--blue); color: var(--blue); }
.login-form label, dialog label { display: grid; gap: 6px; margin-bottom: 12px; font-size: 13px; }
input, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 10px;
  font: inherit;
}
textarea { resize: vertical; }

.mail-view { height: 100vh; display: flex; flex-direction: column; }
.mail-top {
  display: grid;
  grid-template-columns: 220px 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 10px 16px;
  background: var(--blue);
  color: #fff;
}
.logo { font-weight: 700; }
.search { display: flex; gap: 8px; }
.search input { border: 0; }
.who { display: flex; gap: 8px; align-items: center; font-size: 13px; }
.mail-body { flex: 1; display: grid; grid-template-columns: 220px 360px 1fr; min-height: 0; }
.folders { background: #fff; border-right: 1px solid var(--line); padding: 16px 12px; overflow: auto; }
.folder {
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
}
.folder.active, .folder:hover { background: #e8f1ff; color: var(--blue); }
.admin-nav { margin-top: 24px; border-top: 1px solid var(--line); padding-top: 12px; }
.admin-nav p { margin: 0 10px 8px; color: var(--mute); font-size: 12px; }
.list-pane { background: #fff; border-right: 1px solid var(--line); display: flex; flex-direction: column; min-width: 0; }
.list-head { display: flex; justify-content: space-between; align-items: center; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.list-head h2 { margin: 0; font-size: 16px; }
.mail-list { list-style: none; margin: 0; padding: 0; overflow: auto; }
.mail-item { padding: 12px 14px; border-bottom: 1px solid var(--line); cursor: pointer; }
.mail-item:hover { background: #f7f9fc; }
.mail-item.active { background: #e8f1ff; }
.mail-item.unread .subject { color: var(--unread); font-weight: 700; }
.subject { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.preview, .meta { color: var(--mute); font-size: 12px; margin: 4px 0 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.read-pane { background: var(--panel); overflow: auto; padding: 20px 24px; }
.read-empty { margin-top: 20vh; text-align: center; }
#read-subject { margin: 0 0 8px; }
.body { white-space: pre-wrap; font: inherit; margin: 16px 0; }
.read-html {
  display: block;
  width: 100%;
  min-height: 360px;
  border: 0;
  background: #fff;
  margin: 16px 0;
}
.read-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.badge { font-size: 12px; color: #8a5a00; background: #fff3d6; padding: 2px 6px; border-radius: 4px; }
.badge.outbound-sent { color: var(--ok); background: #e6f6ee; }
.badge.outbound-failed { color: var(--danger); background: #fde8e6; }
.badge.outbound-local_only { color: var(--mute); background: #eef1f4; }
.outbound-error { color: var(--danger); white-space: normal; }

dialog { border: 1px solid var(--line); border-radius: 10px; width: min(640px, 94vw); padding: 18px; }
.admin-sheet { min-width: min(720px, 90vw); }
.admin-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.admin-table th, .admin-table td { border-bottom: 1px solid var(--line); text-align: left; padding: 8px 6px; }

@media (max-width: 900px) {
  .mail-top, .mail-body { grid-template-columns: 1fr; }
  .folders, .list-pane { border-right: 0; }
  .mail-body { display: flex; flex-direction: column; }
  .list-pane { max-height: 36vh; }
}

.mail-item { display: flex; align-items: flex-start; gap: 10px; }
.mail-item-main { min-width: 0; flex: 1; }
.avatar {
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  overflow: hidden;
  background: #d7e4f7;
  color: #1b5cc4;
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
}
.avatar.lg { width: 40px; height: 40px; flex-basis: 40px; font-size: 16px; }
.avatar img { width: 100%; height: 100%; object-fit: cover; display: block; }
.read-from { display: flex; align-items: flex-start; gap: 12px; margin: 0 0 8px; }
.read-from .meta { margin: 0; white-space: normal; }
.who-avatar { width: 28px; height: 28px; flex-basis: 28px; }