* { box-sizing: border-box; }
body { font-family: -apple-system, "Segoe UI", Roboto, sans-serif; background: #f4f6fb; color: #1c2333; margin: 0; padding: 24px 12px; }
.wrap { max-width: 860px; margin: 0 auto; background: #fff; border-radius: 12px; padding: 28px; box-shadow: 0 2px 14px rgba(20,40,90,.08); }
h1 { margin: 0 0 4px; font-size: 24px; color: #1B4FA0; }
h2 { margin-top: 28px; color: #1B4FA0; }
.muted { color: #6b768c; font-size: 14px; }
label { display: block; margin: 12px 0; font-weight: 600; font-size: 14px; }
input[type=text], input[type=email], input[type=password], input[type=number], textarea {
  width: 100%; padding: 10px 12px; margin-top: 6px; border: 1px solid #ccd4e4;
  border-radius: 8px; font-size: 15px; font-weight: 400;
}
textarea { font-family: inherit; resize: vertical; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }
.btn { display: inline-block; background: #1B4FA0; color: #fff; border: 0; border-radius: 8px;
  padding: 11px 22px; font-size: 15px; cursor: pointer; text-decoration: none; margin-top: 8px; }
.btn:hover { background: #153d80; }
.btn.primary { background: #1FA2E0; font-size: 17px; padding: 13px 30px; }
nav { margin: 16px 0; border-bottom: 2px solid #e6ebf5; padding-bottom: 8px; }
nav a { margin-right: 18px; text-decoration: none; color: #1B4FA0; font-weight: 600; padding-bottom: 8px; }
nav a.on { border-bottom: 3px solid #1FA2E0; }
nav a.right { float: right; margin-right: 0; color: #6b768c; }
.ok { background: #e6f7ee; border: 1px solid #9fdcb8; color: #14663a; padding: 12px 16px; border-radius: 8px; margin: 12px 0; }
.err { background: #fdecec; border: 1px solid #f3b0b0; color: #a11f1f; padding: 12px 16px; border-radius: 8px; margin: 12px 0; }
pre.preview { background: #f7f9fd; border: 1px solid #dbe3f2; border-radius: 8px; padding: 18px;
  white-space: pre-wrap; font-size: 14px; line-height: 1.6; }
table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 14px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid #e6ebf5; }
th { color: #6b768c; font-size: 12px; text-transform: uppercase; }
td.sent { color: #14663a; font-weight: 700; }
td.failed { color: #a11f1f; font-weight: 700; }
.token { font-family: monospace; background: #f7f9fd; padding: 12px; border-radius: 8px; word-break: break-all; }