:root {
  --primary: #1D4ED8;
  --primary-dark: #1E40AF;
  --navy: #0B1F4B;
  --bg: #F3F6FC;
  --line: #CBD5E1;
  --danger: #B42318;
  --danger-bg: #FEF3F2;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: var(--bg);
  color: var(--navy);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

.card {
  width: 100%;
  max-width: 400px;
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-top: 4px solid var(--primary);
  border-radius: 8px;
  padding: 32px 28px;
}

h1 {
  margin: 0 0 4px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--navy);
}

.sub {
  margin: 0 0 24px;
  color: #475569;
  font-size: 0.95rem;
  overflow-wrap: anywhere;
}

label {
  display: block;
  margin: 16px 0 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--navy);
}

input[type="email"],
input[type="password"],
input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  color: var(--navy);
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-radius: 6px;
}

input:focus {
  outline: 3px solid rgba(29, 78, 216, 0.35);
  outline-offset: 0;
  border-color: var(--primary);
}

button {
  display: block;
  width: 100%;
  margin-top: 24px;
  padding: 13px 16px;
  font-size: 1rem;
  font-weight: 600;
  color: #FFFFFF;
  background: var(--primary);
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}

button:hover { background: var(--primary-dark); }

button:focus-visible {
  outline: 3px solid rgba(29, 78, 216, 0.45);
  outline-offset: 2px;
}

.msg {
  margin: 0 0 8px;
  padding: 10px 12px;
  color: var(--danger);
  background: var(--danger-bg);
  border: 1px solid #FDA29B;
  border-radius: 6px;
  font-size: 0.95rem;
}

.link { color: var(--primary); }

@media (max-width: 420px) {
  .card { padding: 24px 18px; }
}