:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #17202a;
  --muted: #667085;
  --line: #d9dee7;
  --accent: #0f766e;
  --accent-strong: #0b5f59;
  --warn: #a16207;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
}
button, input { font: inherit; }
.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 260px 1fr;
}
.sidebar {
  border-right: 1px solid var(--line);
  background: #111827;
  color: #f9fafb;
  padding: 22px 18px;
}
.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 34px; }
.mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  background: var(--accent);
  border-radius: 8px;
  font-weight: 800;
}
.brand span { display: block; color: #aeb7c5; font-size: 12px; margin-top: 2px; }
nav { display: grid; gap: 6px; }
.nav-item {
  border: 0;
  text-align: left;
  color: #d7dde7;
  background: transparent;
  padding: 11px 12px;
  border-radius: 8px;
  cursor: pointer;
}
.nav-item.active, .nav-item:hover { background: #1f2937; color: #ffffff; }
.main { padding: 28px; min-width: 0; }
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}
.eyebrow { margin: 0 0 4px; color: var(--accent); font-weight: 700; font-size: 12px; text-transform: uppercase; }
h1 { margin: 0; font-size: 30px; letter-spacing: 0; }
.session-panel { display: flex; gap: 8px; align-items: center; }
.session-panel input {
  width: min(360px, 42vw);
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 10px 12px;
  border-radius: 8px;
}
.session-panel button {
  border: 0;
  color: white;
  background: var(--accent);
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
}
.session-panel button:hover { background: var(--accent-strong); }
.status-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr .7fr;
  gap: 12px;
  margin-bottom: 18px;
}
.status-row > div {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
}
.label { display: block; color: var(--muted); font-size: 12px; margin-bottom: 5px; }
.view { display: none; }
.view.active { display: block; }
#view-inbox.active {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
  min-height: 560px;
}
.pane-list, .message-reader, .empty-state, .settings-grid > div, .pro-mail-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.pane-list { overflow: hidden; }
.message-item {
  width: 100%;
  display: block;
  text-align: left;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  padding: 14px;
  cursor: pointer;
}
.message-item:hover { background: #f1f5f9; }
.message-item strong { display: block; margin-bottom: 4px; }
.message-item span { display: block; color: var(--muted); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.message-reader { padding: 20px; overflow: auto; }
.message-reader pre { white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.5; }
.empty-state { padding: 28px; }
.settings-grid, .pro-mail-layout { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.settings-grid > div { padding: 20px; }
.pro-mail-list { display: grid; gap: 10px; align-content: start; }
.pro-mail-card { padding: 16px; display: grid; gap: 6px; }
.pro-mail-card span { color: var(--muted); font-size: 13px; }
.pro-mail-card strong { overflow-wrap: anywhere; }
.pro-mail-card a, #refresh-pro-mailboxes {
  width: fit-content;
  border: 0;
  color: #ffffff;
  background: var(--accent);
  border-radius: 8px;
  padding: 9px 12px;
  text-decoration: none;
  cursor: pointer;
}
.pro-mail-card a:hover, #refresh-pro-mailboxes:hover { background: var(--accent-strong); }
code { background: #eef2f7; padding: 2px 5px; border-radius: 4px; }
@media (max-width: 880px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .topbar, .session-panel { align-items: stretch; flex-direction: column; }
  .session-panel input { width: 100%; }
  .status-row, #view-inbox.active, .settings-grid, .pro-mail-layout { grid-template-columns: 1fr; }
}