:root {
  --text: #1d1d1f;
  --muted: #6b7280;
  --accent: #009aaa;
  --accent-dark: #007b88;
  --error: #b42318;
  --bg: #f3f4f6;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.card {
  width: 100%;
  max-width: 520px;
  margin: 48px 16px 24px;
  padding: 32px;
  background: #fff;
  border-radius: 12px;
}

.brand { margin: 0 0 24px; font-weight: 700; color: var(--accent); letter-spacing: .02em; }
h1 { margin: 0 0 12px; font-size: 24px; font-weight: 600; }
.intro { margin: 0 0 24px; }

form { display: flex; flex-direction: column; }
label { margin: 12px 0 4px; font-weight: 600; }
input {
  padding: 10px 12px;
  font: inherit;
  border: 1px solid #d1d5db;
  border-radius: 8px;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.hint { margin: 12px 0 0; color: var(--muted); font-size: 13px; }

button, .button {
  margin-top: 20px;
  padding: 12px 20px;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  display: inline-block;
}
button:hover, .button:hover { background: var(--accent-dark); }
button:disabled { opacity: .6; cursor: wait; }

.result { margin-top: 24px; padding: 16px; border-radius: 8px; background: #ecfdf3; }
.result.error { background: #fef3f2; color: var(--error); }
.contact { margin: 24px 0 0; color: var(--muted); }
.contact a { color: var(--accent-dark); }

footer { margin: 0 16px 32px; color: var(--muted); font-size: 12px; text-align: center; }
footer a { color: var(--muted); }