:root {
  --ink: #192217;
  --muted: #687163;
  --panel: rgba(255, 253, 248, 0.94);
  --line: rgba(117, 100, 75, 0.2);
  --accent: #2b6440;
  --danger: #a53f33;
  --shadow: 0 28px 80px rgba(31, 35, 27, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 16px;
  font-family: "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top, rgba(140, 176, 125, 0.34), transparent 28%),
    linear-gradient(180deg, #f8f4ea 0%, #ece4d8 100%);
}

.card {
  width: min(100%, 430px);
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 26px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

h1 {
  margin: 0 0 10px;
  font-size: 2rem;
}

p {
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.7;
}

label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid #d7d0c4;
  border-radius: 14px;
  font-size: 1rem;
  background: #fff;
}

button {
  width: 100%;
  margin-top: 14px;
  padding: 14px 16px;
  border: none;
  border-radius: 14px;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
}

.error {
  margin-bottom: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(165, 63, 51, 0.1);
  color: var(--danger);
}