:root {
  --primary: #3b82f6;
  --bg: #f6f7f9;
  --text: #111827;
  --muted: #6b7280;
  --card: #ffffff;
  --danger: #ef4444;
  --success: #10b981;
}
* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica,
    Arial, PingFang SC, Microsoft YaHei, sans-serif;
}
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.topbar {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  background: var(--card);
  border-bottom: 1px solid #e5e7eb;
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar .title {
  font-size: 18px;
  font-weight: 600;
}
.topbar .badge {
  background: var(--primary);
  color: #fff;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
}
.search {
  padding: 10px 16px;
  background: var(--card);
  border-bottom: 1px solid #e5e7eb;
  display: flex;
  gap: 8px;
}
.search input {
  flex: 1;
  height: 36px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 0 12px;
  font-size: 14px;
}
.search button {
  height: 36px;
  padding: 0 12px;
  border: none;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
}
.list {
  flex: 1;
  overflow: auto;
  padding: 12px;
}
.card {
  background: var(--card);
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 12px;
  margin-bottom: 10px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.avatar {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  background: #dbeafe;
  color: #1e40af;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}
.content {
  flex: 1;
  min-width: 0;
}
.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.subject {
  font-size: 15px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.meta {
  font-size: 12px;
  color: var(--muted);
  display: flex;
  gap: 8px;
}
.preview {
  font-size: 13px;
  color: #374151;
  margin-top: 6px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.btn {
  border: none;
  background: #eef2ff;
  color: #3730a3;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 12px;
}
.btn.danger {
  background: #fee2e2;
  color: #b91c1c;
}
.btn.starred {
  background: #fff7ed;
  color: #c2410c;
}
.btn.read {
  background: #ecfeff;
  color: #0e7490;
}
.fab {
  position: fixed;
  right: 16px;
  bottom: 84px;
  width: 56px;
  height: 56px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  border: none;
}
.tabs {
  position: sticky;
  bottom: 0;
  background: var(--card);
  border-top: 1px solid #e5e7eb;
  height: 64px;
  display: flex;
}
.tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--muted);
}
.tab.active {
  color: var(--primary);
}
.drawer {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.12);
  display: flex;
  justify-content: center;
  align-items: flex-end;
  padding: 16px;
}
.panel {
  width: 100%;
  max-width: 640px;
  background: var(--card);
  border-radius: 16px;
  border: 1px solid #e5e7eb;
  padding: 16px;
  max-height: 80vh;
  overflow: auto;
}
.panel h3 {
  margin: 0 0 8px;
  font-size: 16px;
}
.panel .field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}
.panel input,
.panel textarea {
  width: 100%;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 14px;
}
.panel textarea {
  min-height: 120px;
  resize: vertical;
}
.panel .row {
  margin-top: 8px;
}
.panel .row .btn {
  font-size: 14px;
  padding: 10px 14px;
}
.badge.small {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #f3f4f6;
  color: #374151;
}