:root {
  --bg: #f3f2ee;
  --card: #ffffff;
  --ink: #1b2232;
  --muted: #5b6478;
  --line: #dad8d0;
  --accent: #3b6fe0;
  --crit: #b5482f;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161f;
    --card: #1e2433;
    --ink: #eef0f4;
    --muted: #8c95a8;
    --line: #2c3447;
  }
}
* {
  box-sizing: border-box;
}
body {
  display: grid;
  min-height: 100vh;
  margin: 0;
  padding: 16px;
  place-items: center;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}
.card {
  width: min(420px, 100%);
  padding: 36px 32px 28px;
  border-radius: 24px;
  background: var(--card);
  box-shadow:
    0 1px 2px rgb(0 0 0 / 0.06),
    0 12px 40px rgb(0 0 0 / 0.08);
}
.logo {
  display: block;
}
h1 {
  margin: 18px 0 4px;
  font-size: 24px;
}
.sub {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 14px;
}
form {
  display: grid;
  gap: 14px;
}
label {
  display: grid;
  gap: 6px;
  font-size: 13px;
}
label span {
  color: var(--muted);
}
small {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}
input {
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: transparent;
  color: var(--ink);
  font-size: 15px;
}
input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
button {
  height: 46px;
  margin-top: 6px;
  border: 0;
  border-radius: 12px;
  background: var(--ink);
  color: var(--bg);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
button:disabled {
  opacity: 0.6;
  cursor: progress;
}
.error {
  margin: 0;
  color: var(--crit);
  font-size: 13px;
}
.foot {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}