:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1c1f24;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --danger: #dc2626;
  --unread: #eff6ff;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #181b21;
    --text: #e6e8eb;
    --muted: #9aa1ac;
    --border: #2a2f38;
    --accent: #3b82f6;
    --unread: #1b2433;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
button { font: inherit; cursor: pointer; }
.hidden { display: none !important; }

.top { padding: 14px 16px; border-bottom: 1px solid var(--border); background: var(--card); }
.brand { font-weight: 700; font-size: 18px; max-width: 1100px; margin: 0 auto; }

.wrap { max-width: 1100px; margin: 0 auto; padding: 16px; display: grid; gap: 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }

.label { margin: 0 0 8px; color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .04em; }
.address-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.address {
  flex: 1 1 260px; min-width: 0; font-size: 20px; padding: 10px 12px; border-radius: 8px;
  background: var(--bg); border: 1px solid var(--border); overflow-wrap: anywhere;
}
.meta { color: var(--muted); font-size: 13px; margin: 8px 0 0; }

.btn {
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  padding: 9px 16px; border-radius: 8px;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.small { padding: 4px 10px; font-size: 13px; }
.btn.danger { color: var(--danger); }
.link { border: 0; background: none; color: var(--accent); padding: 0; font-size: inherit; }
.link.danger { color: var(--danger); }

.custom { margin-top: 12px; }
.custom summary { cursor: pointer; color: var(--accent); font-size: 14px; }
.new-form { display: flex; gap: 8px; align-items: center; margin-top: 10px; flex-wrap: wrap; }
.new-form input, .new-form select {
  padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); font: inherit;
}
.new-form input { flex: 1 1 180px; min-width: 0; }
.history { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px; }
.history button { border: 1px solid var(--border); background: var(--bg); color: var(--text); border-radius: 999px; padding: 3px 10px; font-size: 13px; }

.token { flex: 1 1 260px; min-width: 0; font-size: 13px; padding: 6px 10px; border-radius: 8px; background: var(--bg); border: 1px solid var(--border); overflow-wrap: anywhere; }
.code { font-size: 12px; padding: 10px; border-radius: 8px; background: var(--bg); border: 1px solid var(--border); overflow-x: auto; margin: 6px 0 0; }
.status.live { color: #16a34a; }
#countdown.warn { color: var(--danger); }
.otp {
  display: inline-block; margin: 4px 0; padding: 1px 8px; border-radius: 6px; cursor: pointer;
  font: 600 13px ui-monospace, monospace; letter-spacing: .08em;
  background: var(--unread); border: 1px solid var(--accent); color: var(--accent);
}
.otp.big { font-size: 18px; padding: 2px 12px; }

.mail { display: grid; grid-template-columns: 340px 1fr; gap: 16px; min-height: 480px; }
.list { padding: 0; overflow: hidden; }
.list-head { display: flex; justify-content: space-between; align-items: baseline; padding: 14px 16px; border-bottom: 1px solid var(--border); }
.list-head h2 { margin: 0; font-size: 16px; }
.status { font-size: 12px; color: var(--muted); }
#messages { list-style: none; margin: 0; padding: 0; }
#messages li { padding: 12px 16px; border-bottom: 1px solid var(--border); cursor: pointer; }
#messages li.unread { background: var(--unread); }
#messages li.unread .subj { font-weight: 700; }
#messages li.active { outline: 2px solid var(--accent); outline-offset: -2px; }
#messages .from { font-size: 13px; color: var(--muted); display: flex; justify-content: space-between; gap: 8px; }
#messages .subj, #messages .prev { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#messages .prev { font-size: 13px; color: var(--muted); }
.empty { padding: 24px 16px; color: var(--muted); text-align: center; }

.viewer { display: flex; flex-direction: column; min-width: 0; }
.viewer-head h3 { margin: 4px 0; overflow-wrap: anywhere; }
.viewer-actions { display: flex; gap: 6px; align-items: center; margin: 10px 0; flex-wrap: wrap; }
.tab { border: 1px solid var(--border); background: none; color: var(--muted); padding: 4px 10px; border-radius: 6px; font-size: 13px; }
.tab.active { color: var(--text); border-color: var(--text); }
.back { display: none; }
#v-frame { flex: 1; width: 100%; min-height: 420px; border: 1px solid var(--border); border-radius: 8px; background: #fff; }
.textbody { flex: 1; white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; padding: 12px; background: var(--bg); border-radius: 8px; font-size: 14px; }
.attachments { list-style: none; padding: 0; margin: 12px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.attachments a { display: inline-block; padding: 6px 10px; border: 1px solid var(--border); border-radius: 8px; color: var(--text); text-decoration: none; font-size: 13px; }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 8px;
  opacity: 0; transition: .2s; pointer-events: none; max-width: calc(100% - 32px);
}
.toast.show { opacity: 1; transform: translateX(-50%); }

@media (max-width: 760px) {
  .mail { grid-template-columns: 1fr; }
  .mail.reading .list, .placeholder { display: none; }
  .back { display: inline; }
}