:root {
  --surface: #ffffff;
  --ink: #000000;
  --sacci: #389b5f;
  --rule: #e5e5e5;
  --muted: #555555;
  --error: #ef3e3e;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

.shell {
  max-width: 620px;
  margin: 0 auto;
  padding: 40px 20px 64px;
}

.masthead {
  text-align: center;
  padding-bottom: 8px;
}

.logo {
  display: block;
  margin: 0 auto;
  height: auto;
}

.tagline {
  margin: 10px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.intro h1 {
  font-size: 28px;
  margin: 32px 0 4px;
  letter-spacing: -0.01em;
}

.intro p {
  margin: 0 0 24px;
  color: var(--muted);
  max-width: 52ch;
}

.card {
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 24px;
  display: grid;
  gap: 18px;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 520px) {
  .row { grid-template-columns: 1fr; }
}

.field { display: flex; flex-direction: column; gap: 6px; }

label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.req { color: var(--error); }

input, select, textarea {
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 10px 12px;
  width: 100%;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--sacci);
  box-shadow: 0 0 0 3px rgba(56, 155, 95, 0.15);
}

button {
  font: inherit;
  font-weight: 600;
  color: #ffffff;
  background: var(--ink);
  border: 0;
  border-radius: 6px;
  padding: 12px 20px;
  cursor: pointer;
  transition: background 0.15s ease;
}

button:hover { background: var(--sacci); }
button:disabled { opacity: 0.55; cursor: not-allowed; }

.hp {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-status { min-height: 20px; margin: 0; font-size: 14px; }
.form-status.ok { color: var(--sacci); }
.form-status.err { color: var(--error); }

.foot {
  margin-top: 32px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}