:root {
  color-scheme: light;
  --surface: #f7f7f8;
  --paper: #ffffff;
  --ink: #111318;
  --muted: #60656f;
  --line: #d9dce2;
  --accent: #002fa7;
  --danger: #c62020;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(to right, transparent calc(50% - 1px), var(--line) 50%, transparent calc(50% + 1px)),
    var(--surface);
}

.login-shell {
  width: min(1120px, calc(100% - 48px));
  min-height: 100vh;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

.intro,
.login-card {
  padding: 64px;
}

.product-index,
.card-number {
  margin: 0 0 48px;
  color: var(--accent);
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.06em;
}

h1,
h2 {
  margin: 0;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 460px;
  font-size: clamp(48px, 7vw, 86px);
  line-height: 0.95;
}

h2 {
  font-size: 32px;
  line-height: 1.1;
}

.intro-copy,
.helper {
  color: var(--muted);
  line-height: 1.65;
}

.intro-copy {
  max-width: 460px;
  margin: 32px 0 48px;
  font-size: 18px;
}

.privacy-grid {
  margin: 0;
  border-top: 1px solid var(--line);
}

.privacy-grid div {
  display: grid;
  grid-template-columns: 96px 1fr;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.privacy-grid dt {
  color: var(--muted);
}

.privacy-grid dd {
  margin: 0;
  font-weight: 600;
}

.login-card {
  background: var(--paper);
  border: 1px solid var(--line);
}

.helper {
  margin: 12px 0 36px;
}

form {
  display: grid;
  gap: 12px;
}

label {
  font-size: 14px;
  font-weight: 700;
}

input,
button {
  width: 100%;
  min-height: 52px;
  border-radius: 0;
  font: inherit;
}

input {
  padding: 0 16px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
  outline: none;
}

input:focus {
  border-color: var(--accent);
  box-shadow: inset 4px 0 0 var(--accent);
}

button {
  margin-top: 8px;
  border: 1px solid var(--accent);
  color: #ffffff;
  background: var(--accent);
  cursor: pointer;
  font-weight: 700;
}

button:disabled {
  cursor: wait;
  opacity: 0.62;
}

.status {
  min-height: 24px;
  margin: 20px 0 0;
  color: var(--danger);
  font-size: 14px;
  line-height: 1.5;
}

@media (max-width: 760px) {
  body {
    background: var(--surface);
  }

  .login-shell {
    width: 100%;
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .intro,
  .login-card {
    padding: 32px 24px;
  }

  .product-index,
  .card-number {
    margin-bottom: 28px;
    font-size: 48px;
  }

  h1 {
    font-size: 52px;
  }
}