:root {
  --bg: #f5f6f8; --card-bg: #ffffff; --border: #e2e4e9; --text: #1a1d27; --muted: #6b7280;
  --accent: #3b82f6; --sel: #3b82f61a;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1117; --card-bg: #171922; --border: #2a2e3a; --text: #e6e8ec; --muted: #9aa0ac; --sel: #3b82f62e; }
}
* { box-sizing: border-box; }
html, body { margin: 0; overflow-x: hidden; }
body { background: var(--bg); color: var(--text); font: 14px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
button { font: inherit; }
.muted { color: var(--muted); }

.demo-banner { background: #f59e0b; color: #1a1d27; font-weight: 600; font-size: 13px; text-align: center; padding: 8px 16px; }
.demo-nav { display: flex; flex-wrap: wrap; gap: 4px 16px; align-items: center; padding: 10px 16px; border-bottom: 1px solid var(--border); background: var(--card-bg); }
.demo-nav a { color: var(--muted); text-decoration: none; padding: 4px 0; }
.demo-nav a[aria-current=page] { color: var(--text); font-weight: 600; border-bottom: 2px solid var(--accent); }
.demo-brand { font-weight: 700; margin-right: 8px; }

.app { display: grid; grid-template-columns: 220px minmax(260px, 380px) 1fr; min-height: calc(100vh - 90px); }
.folders { border-right: 1px solid var(--border); padding: 12px 8px; background: var(--card-bg); }
.folders-title { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 14px 10px 6px; }
.folders ul, .list ol { list-style: none; margin: 0; padding: 0; }
.folders button { width: 100%; display: flex; justify-content: space-between; gap: 8px; align-items: center; text-align: left;
  border: 0; background: transparent; color: var(--text); padding: 7px 10px; border-radius: 8px; cursor: pointer; }
.folders button:hover { background: var(--sel); }
.folders button[aria-pressed=true] { background: var(--sel); font-weight: 600; }
.folders .count { color: var(--muted); font-variant-numeric: tabular-nums; font-size: 12px; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 8px; }

.list { border-right: 1px solid var(--border); overflow-y: auto; }
.list-head { display: flex; align-items: baseline; gap: 10px; padding: 14px 16px 8px; }
.list-head h1 { font-size: 17px; margin: 0; }
.msg { display: block; width: 100%; text-align: left; border: 0; border-bottom: 1px solid var(--border); background: transparent;
  color: var(--text); padding: 10px 16px; cursor: pointer; }
.msg:hover { background: var(--sel); }
.msg[aria-current=true] { background: var(--sel); box-shadow: inset 3px 0 0 var(--accent); }
.msg.unread .msg-from, .msg.unread .msg-subject { font-weight: 700; }
.msg-top { display: flex; justify-content: space-between; gap: 8px; }
.msg-from { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg-subject { margin-top: 2px; overflow-wrap: anywhere; }
.msg-snippet { color: var(--muted); font-size: 13px; margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chips { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 6px; }
.chip { font-size: 11px; font-weight: 600; padding: 1px 7px; border-radius: 999px; border: 1px solid; white-space: nowrap; }
.chip.review { color: #ef4444; background: #ef444418; border-color: #ef444455; }
.chip.label { color: #3b82f6; background: #3b82f618; border-color: #3b82f655; }
.chip.read { color: #10b981; background: #10b98118; border-color: #10b98155; }
.chip.sev-high { color: #ef4444; background: #ef444418; border-color: #ef444455; }
.chip.sev-medium { color: #f59e0b; background: #f59e0b18; border-color: #f59e0b55; }
.chip.sev-low { color: #ca8a04; background: #eab30818; border-color: #eab30855; }

.detail { padding: 18px 24px 40px; overflow-y: auto; min-width: 0; }
.detail .empty { color: var(--muted); margin-top: 40px; text-align: center; }
.back { display: none; border: 0; background: transparent; color: var(--accent); padding: 0 0 10px; cursor: pointer; }
.detail h2 { margin: 0 0 6px; font-size: 20px; overflow-wrap: anywhere; }
.from-line { color: var(--muted); overflow-wrap: anywhere; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 14px 0; }
.toolbar button { padding: 6px 12px; border-radius: 8px; border: 1px solid var(--border); background: transparent; color: var(--muted); cursor: not-allowed; }
.toolbar .note { color: var(--muted); font-size: 12px; }
.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; margin-top: 14px; }
.card h3 { margin: 0 0 8px; font-size: 14px; }
.verdict { font-weight: 600; }
.verdict.read { color: #10b981; } .verdict.review { color: #ef4444; }
.body-text { white-space: pre-wrap; overflow-wrap: anywhere; }
.flag { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; margin-top: 6px; }
.flag-kind { font-weight: 600; }
details summary { cursor: pointer; color: var(--accent); }
pre.why { white-space: pre-wrap; overflow-wrap: anywhere; font: 12.5px/1.45 Consolas, "Cascadia Mono", monospace; background: var(--bg);
  border-radius: 8px; padding: 12px; margin: 10px 0 0; }
.noscript { padding: 24px; }

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .folders { border-right: 0; border-bottom: 1px solid var(--border); padding: 8px 12px; }
  .folders ul { display: flex; flex-wrap: wrap; gap: 4px; }
  .folders li { flex: 0 0 auto; }
  .folders button { width: auto; border: 1px solid var(--border); padding: 4px 10px; }
  .folders-title { margin: 8px 2px 4px; }
  .list { border-right: 0; }
  .app.reading .folders, .app.reading .list { display: none; }
  .app:not(.reading) .detail { display: none; }
  .back { display: inline-block; }
  .detail { padding: 14px 16px 40px; }
}