:root {
  --bg: #f5f2ea;
  --card: #fffefb;
  --ink: #1f2937;
  --muted: #5b6470;
  --line: #e2d8c8;
  --error: #b91c1c;
  --accent: #0f766e;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Space Grotesk", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at 18% 10%, #d6f5f1 0%, transparent 40%),
    radial-gradient(circle at 82% 4%, #ffe6cf 0%, transparent 34%), var(--bg);
  color: var(--ink);
  display: grid;
  place-items: center;
  padding: 20px;
}

.card {
  width: min(460px, 94vw);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.1);
  padding: 22px;
}

h1 {
  margin: 0;
  font-size: 1.4rem;
}

.sub {
  margin: 8px 0 16px;
  color: var(--muted);
  font-size: 0.95rem;
}

.err {
  margin: 0 0 12px;
  color: var(--error);
  font-weight: 700;
}

label {
  display: block;
  font-size: 0.92rem;
  margin: 10px 0 6px;
  color: var(--muted);
}

input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font: inherit;
}

button {
  margin-top: 14px;
  width: 100%;
  border: 0;
  border-radius: 10px;
  background: linear-gradient(130deg, #0f766e, #0a5a54);
  color: #fff;
  font: inherit;
  font-weight: 700;
  padding: 10px 14px;
  cursor: pointer;
}

.foot {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
}