:root {
  --bg: #f4efe7;
  --panel: rgba(255, 252, 247, 0.9);
  --panel-strong: #fffdf9;
  --line: rgba(109, 79, 45, 0.16);
  --text: #2a2118;
  --muted: #746657;
  --primary: #1863d6;
  --danger: #b42318;
  --shadow: 0 18px 45px rgba(63, 42, 18, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.8), transparent 32%),
    linear-gradient(135deg, #efe3d1 0%, #f8f4ee 48%, #ece5dc 100%);
}

.wrap {
  max-width: 1360px;
  margin: 0 auto;
  padding: 28px 18px 24px;
}

.hero,
.workspace {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero {
  position: relative;
  overflow: hidden;
  border-radius: 28px;
  padding: 28px;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -50px -80px auto;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(24, 99, 214, 0.16), transparent 68%);
  pointer-events: none;
}

h1 {
  margin: 0;
  font-size: 34px;
  line-height: 1.05;
  font-family: "Iowan Old Style", "Palatino Linotype", "Times New Roman", serif;
  letter-spacing: 0.02em;
}

.desc {
  margin: 10px 0 18px;
  color: var(--muted);
  font-size: 14px;
}

.mono {
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

textarea {
  width: 100%;
  min-height: 96px;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 16px 18px;
  font-size: 13px;
  line-height: 1.6;
  resize: vertical;
  color: var(--text);
  background: rgba(255, 255, 255, 0.78);
}

.controls {
  margin-top: 14px;
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.credential-tags { margin-top: 12px; display: flex; gap: 8px; flex-wrap: wrap; }
.credential-tag { border: 0; padding: 5px 10px; cursor: pointer; box-shadow: none; background: rgba(139, 102, 59, 0.09); color: #6e5234; }

button {
  border: 0;
  border-radius: 999px;
  padding: 11px 18px;
  color: #fff;
  background: linear-gradient(135deg, #0f5ed7, #2b78ea);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(15, 94, 215, 0.22);
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.status {
  font-size: 13px;
  color: var(--muted);
}

.err {
  color: var(--danger);
}

.workspace {
  margin-top: 18px;
  border-radius: 30px;
  padding: 18px;
  display: grid;
  grid-template-columns: minmax(320px, 430px) minmax(0, 1fr);
  gap: 18px;
  min-height: 68vh;
}

.panel {
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel-strong);
  overflow: hidden;
}

.panel-head {
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 250, 243, 0.95), rgba(255, 253, 249, 0.9));
}

.panel-title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}

.panel-subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.mail-list {
  height: calc(68vh - 74px);
  overflow: auto;
  padding: 10px;
}

.mail-item {
  width: 100%;
  margin: 0 0 10px;
  padding: 14px 14px 15px;
  border: 1px solid transparent;
  border-radius: 18px;
  background: transparent;
  color: inherit;
  text-align: left;
  box-shadow: none;
}

.mail-item:hover {
  background: rgba(139, 102, 59, 0.05);
  border-color: rgba(139, 102, 59, 0.14);
  transform: translateY(-1px);
}

.mail-item.active {
  background: linear-gradient(180deg, rgba(24, 99, 214, 0.08), rgba(24, 99, 214, 0.03));
  border-color: rgba(24, 99, 214, 0.22);
}

.mail-meta,
.detail-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 12px;
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 3px 9px;
  background: rgba(139, 102, 59, 0.09);
  color: #6e5234;
  font-weight: 700;
}

.mail-subject {
  margin: 10px 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.mail-from {
  margin: 0 0 8px;
  font-size: 13px;
  color: #5f5347;
}

.mail-preview {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.mail-empty,
.detail-empty {
  display: grid;
  place-items: center;
  min-height: 240px;
  padding: 24px;
  color: var(--muted);
  text-align: center;
  line-height: 1.7;
}

.detail {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  height: 100%;
  min-height: 68vh;
}

.detail-head {
  padding: 20px 22px 14px;
  border-bottom: 1px solid var(--line);
}

.detail-subject {
  margin: 0;
  font-size: 24px;
  line-height: 1.3;
  font-family: "Iowan Old Style", "Palatino Linotype", "Times New Roman", serif;
}

.detail-from {
  margin: 12px 0 0;
  color: #5f5347;
  font-size: 14px;
}

.detail-meta {
  padding: 0 22px 14px;
  border-bottom: 1px solid var(--line);
}

.detail-body {
  min-height: 0;
  background: #fffdfa;
}

iframe {
  width: 100%;
  height: 100%;
  border: 0;
  background: #fffdfa;
}

@media (max-width: 980px) {
  .workspace {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .mail-list,
  .detail {
    height: auto;
    min-height: 360px;
  }
}