:root {
  --blue: #1d4ed8;
  --blue-dark: #13275c;
  --yellow: #eab308;
  --ink: #101828;
  --muted: #4a5566;
  --line: #dbe3f0;
  --bg: #f8fafe;
  --card: #ffffff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
}
header {
  background: linear-gradient(135deg, var(--blue-dark), var(--blue));
  color: #fff;
  padding: 40px 20px 44px;
}
header .inner { max-width: 760px; margin: 0 auto; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; }
.brand .dot { width: 12px; height: 12px; border-radius: 3px; background: var(--yellow); }
header h1 { margin: 18px 0 6px; font-size: 30px; line-height: 1.2; }
header p { margin: 0; opacity: .85; font-size: 15px; }
main { max-width: 760px; margin: -24px auto 60px; padding: 0 20px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 26px 26px 30px;
  box-shadow: 0 6px 24px rgba(16, 24, 40, .05);
}
h2 { font-size: 19px; margin: 30px 0 8px; }
h2:first-child { margin-top: 0; }
h3 { font-size: 16px; margin: 20px 0 6px; }
p, li { color: var(--muted); font-size: 15px; }
ul { padding-left: 20px; }
li { margin: 5px 0; }
strong { color: var(--ink); }
a { color: var(--blue); }
table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 14.5px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--ink); font-weight: 600; background: #f2f6fd; }
td { color: var(--muted); }
.pill {
  display: inline-block; background: #fef3c7; color: #6b4708;
  border-radius: 999px; padding: 3px 11px; font-size: 12.5px; font-weight: 600;
}
.contact { background: #f2f6fd; border-radius: 12px; padding: 16px 18px; margin-top: 8px; }
.contact div { margin: 3px 0; font-size: 15px; color: var(--muted); }
footer { text-align: center; padding: 0 20px 50px; color: #8b95a6; font-size: 13.5px; }
footer a { color: #8b95a6; }
label { display: block; font-weight: 600; margin: 18px 0 6px; font-size: 15px; }
input[type=text] {
  width: 100%; padding: 13px 14px; font-size: 15px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink);
}
input[type=text]:focus { outline: 2px solid var(--blue); border-color: transparent; }
button {
  margin-top: 16px; width: 100%; padding: 14px; font-size: 16px; font-weight: 600;
  background: var(--blue); color: #fff; border: 0; border-radius: 10px; cursor: pointer;
}
button:hover { background: #1a44c2; }
button:disabled { background: #9db3e8; cursor: not-allowed; }
.result { margin-top: 18px; padding: 14px 16px; border-radius: 10px; font-size: 15px; display: none; }
.result.ok { display: block; background: #d1fae5; color: #065f46; }
.result.err { display: block; background: #ffe4e6; color: #881337; }
.hint { font-size: 13.5px; color: #6b7688; margin-top: 6px; }