:root {
  --bg: #f3f3f3;
  --panel: #ffffff;
  --line: #0d12171a;
  --text: #0d1217;
  --muted: #0d121780;
  --blue: #2c87fd;
  --blue-hover: #297be6;
  --green: #27ae60;
  --error: #ff3636;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}
.page { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
.hero h1 { margin: 12px 0 8px; font-size: 30px; }
.lead { color: var(--muted); margin: 0 0 24px; }
.badge {
  display: inline-block; padding: 5px 10px; border-radius: 8px;
  background: #2c87fd1a; color: var(--blue); font-size: 12px; font-weight: 600;
}
.card, .tech-note {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 16px; padding: 22px; margin-top: 16px;
}
h2 { margin: 0 0 6px; font-size: 19px; }
h3 { margin: 0 0 6px; font-size: 16px; color: var(--green); }
.muted { color: var(--muted); font-size: 13px; margin: 0 0 16px; }
label { display: block; font-weight: 600; font-size: 13px; margin: 14px 0 6px; }
input[type="tel"] {
  width: 100%; height: 48px; padding: 0 14px; font-size: 16px;
  border: 1px solid #0d121733; border-radius: 12px; background: #fff; color: var(--text);
}
input[type="tel"]:focus { outline: 2px solid var(--blue); outline-offset: 1px; border-color: var(--blue); }
.error { color: var(--error); font-size: 13px; margin: 6px 0 0; }
.consent { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; }
.consent span { color: var(--muted); font-size: 12.5px; }
button {
  margin-top: 18px; width: 100%; height: 52px; border: 0; border-radius: 12px;
  background: var(--blue); color: #fff; font-size: 16px; font-weight: 600; cursor: pointer;
}
button:hover { background: var(--blue-hover); }
button:disabled { opacity: 0.5; cursor: default; }
.button-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.button-row button { margin-top: 0; }
button.secondary { background: var(--panel); color: var(--text); border: 1px solid #0d121733; }
button.secondary:hover { background: #0d12170d; }
@media (max-width: 520px) { .button-row { grid-template-columns: 1fr; } }
code { background: #0d12170d; padding: 1px 6px; border-radius: 6px; font-size: 12.5px; }
ul { margin: 8px 0 0; padding-left: 20px; color: var(--muted); font-size: 13.5px; }