:root {
  --ink: #111111;
  --muted: #6b6b6b;
  --line: #e6e6e6;
  --soft: #f7f7f7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #ffffff;
  color: var(--ink);
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.login-card {
  width: min(420px, 92vw);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
  background: #ffffff;
  box-shadow: 0 24px 60px rgba(22, 22, 22, 0.12);
  text-align: center;
}

.logo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 12px;
}

h1 {
  margin: 0 0 8px;
  font-size: 1.6rem;
}

.hint {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 0.9rem;
}

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

input {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  font-size: 1rem;
}

button {
  padding: 10px 12px;
  border-radius: 999px;
  border: none;
  background: #111111;
  color: #ffffff;
  font-size: 1rem;
  cursor: pointer;
}

.error {
  margin-top: 10px;
  color: #c1121f;
  font-size: 0.9rem;
}