:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --fg: #202124;
  --muted: #5f6368;
  --border: #dadce0;
  --accent: #1a73e8;
  --accent-soft: #e8f0fe;
  --hover: #f1f3f4;
  --warn: #d93025;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(60, 64, 67, 0.2), 0 4px 8px 3px rgba(60, 64, 67, 0.08);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  font: 14px/1.5 -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--fg);
  background: var(--surface);
}

button {
  font: inherit;
  border: 0;
  border-radius: var(--radius);
  background: none;
  color: var(--accent);
  padding: 6px 14px;
  cursor: pointer;
  white-space: nowrap;
}
button:hover { background: var(--hover); }
button:disabled { color: var(--muted); cursor: default; }

input, textarea {
  font: inherit;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--fg);
}
input:focus, textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

/* --- top bar --------------------------------------------------------------- */

.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}
.brand { font-size: 18px; font-weight: 500; letter-spacing: -0.02em; }
.search {
  flex: 1;
  max-width: 640px;
  margin: 0 auto;
  background: var(--hover);
  border: 0;
  border-radius: var(--radius);
  padding: 8px 16px;
}
.search:focus { background: var(--surface); outline: 1px solid var(--border); }
.top-actions { display: flex; align-items: center; gap: 4px; }
.account { font-size: 13px; color: var(--muted); margin-right: 4px; }
.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

/* --- layout ------------------------------------------------------------------ */

main { flex: 1; min-height: 0; display: flex; background: var(--bg); }

.rail {
  width: 200px;
  padding: 12px 8px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.compose {
  align-self: flex-start;
  margin: 0 8px 16px;
  padding: 12px 26px;
  border-radius: 20px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 500;
  box-shadow: var(--shadow);
}
.compose:hover { background: var(--accent); color: #fff; }

#folders button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  padding: 8px 16px;
  color: var(--fg);
  font-weight: 500;
}
#folders button:hover { background: var(--hover); }
#folders button.active { background: var(--accent-soft); color: var(--accent); }
#folders .count { color: var(--accent); font-weight: 500; margin-left: 8px; }

.list {
  min-width: 360px;
  max-width: 460px;
  overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--border);
}

.item {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 9px 16px;
  border-bottom: 1px solid #eee;
  cursor: pointer;
  color: var(--muted);
}
.item:hover { background: var(--hover); }
.item.selected { background: var(--accent-soft); }
.item.unread { color: var(--fg); }
.item .who { width: 150px; flex: none; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item .mid { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.item .subject { font-weight: 400; }
.item.unread .who { font-weight: 700; }
.item.unread .subject { font-weight: 700; }
.item .snippet { color: var(--muted); }
.item.unread .snippet { color: var(--fg); }
.item .when { flex: none; font-size: 12px; color: var(--muted); }
.item button { padding: 2px 12px; font-size: 12px; }

.view { flex: 1; min-width: 0; overflow-y: auto; padding: 24px 28px; }
.view h2 { margin: 0 0 10px; font-size: 20px; font-weight: 400; }
.view .meta { font-size: 13px; color: var(--muted); margin-bottom: 14px; white-space: pre-line; }
.view .fields { font-family: var(--mono); font-size: 12px; color: var(--muted); margin-bottom: 10px; white-space: pre-line; }
.view pre {
  white-space: pre-wrap;
  font-family: inherit;
  margin: 14px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--border);
}
.view .actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 18px; }
.view .actions button { border: 1px solid var(--border); box-shadow: var(--shadow); color: var(--fg); }
.view .actions button:hover { background: var(--hover); color: var(--fg); }

.verified {
  display: inline-block;
  font-size: 12px;
  padding: 2px 10px;
  border-radius: 12px;
  background: #e6f4ea;
  color: #137333;
}
.warn { color: var(--warn); }
.placeholder { color: var(--muted); font-style: italic; padding: 12px 16px; }

.name-sender { display: flex; gap: 8px; margin: 12px 0 0; }
.name-sender input { flex: 1; }

/* --- setup -------------------------------------------------------------------- */

.setup {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  background: var(--bg);
}
.setup h2 { margin: 0; font-weight: 400; }
.setup p { color: var(--muted); max-width: 480px; }
.setup .row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; justify-content: center; }

/* --- dialogs --------------------------------------------------------------------- */

dialog {
  border: 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  min-width: 460px;
  max-width: 640px;
}
dialog::backdrop { background: rgba(32, 33, 36, 0.3); }
#compose form { display: flex; flex-direction: column; gap: 10px; }
#compose input, #compose textarea { width: 100%; }
#compose textarea { font-family: inherit; resize: vertical; }
#compose footer { display: flex; gap: 8px; align-items: center; justify-content: flex-end; padding-top: 4px; }
#compose .anon { font-size: 13px; color: var(--muted); margin-right: auto; display: flex; align-items: center; gap: 6px; }
.error { color: var(--warn); font-size: 13px; }

#settings section { margin-bottom: 22px; }
#settings h3 { margin: 0 0 6px; font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
#settings form { display: flex; gap: 8px; margin: 6px 0; }
#settings form input { flex: 1; font-family: var(--mono); font-size: 13px; }
#settings footer { display: flex; justify-content: flex-end; }
.hint { font-size: 12px; color: var(--muted); margin: 4px 0; }

.kv { list-style: none; padding: 0; margin: 6px 0; font-size: 13px; }
.kv li { display: flex; gap: 10px; padding: 3px 0; align-items: baseline; }
.kv .key { font-family: var(--mono); word-break: break-all; color: var(--muted); flex: 1; }

#identity-card { font-family: var(--mono); font-size: 12px; }
#identity-card div { margin: 4px 0; word-break: break-all; }
#identity-card .seed { border: 1px dashed var(--warn); padding: 6px; }

/* --- toast ------------------------------------------------------------------------ */

.toast {
  position: fixed;
  left: 24px;
  bottom: 24px;
  max-width: 520px;
  margin: 0;
  padding: 12px 18px;
  border-radius: var(--radius);
  background: #202124;
  color: #e8eaed;
  font-size: 13px;
  white-space: pre-wrap;
  box-shadow: var(--shadow);
  cursor: pointer;
}
.toast.warn { background: var(--warn); color: #fff; }
.toast[hidden] { display: none; }