:root {
  --navy: #17233d;
  --orange: #e88e31;
  --paper: #f5f5f1;
  --surface: #fffefa;
  --ink: #192740;
  --muted: #68758d;
  --line: #dce3ed;
  --red: #c65a58;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: linear-gradient(115deg, var(--navy) 0 45%, var(--paper) 45%);
  font:
    14px/1.5 'Microsoft YaHei',
    'PingFang SC',
    sans-serif;
}
.shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 500px;
}
.intro {
  padding: 9vw;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.eyebrow {
  color: #f2bd83;
  font:
    700 11px Consolas,
    monospace;
  letter-spacing: 0.16em;
}
.intro h1 {
  margin: 13px 0 0;
  font:
    600 clamp(42px, 5vw, 70px) / 1.08 'STSong',
    'SimSun',
    serif;
}
.intro p {
  max-width: 500px;
  color: #bfcee5;
  font-size: 16px;
  line-height: 1.9;
}
.path {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 25px;
  color: #e6c39e;
}
.path i {
  width: 48px;
  height: 1px;
  background: #826d61;
}
.login {
  padding: 55px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.card {
  padding: 30px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 13px;
  box-shadow: 0 24px 55px rgba(20, 33, 58, 0.15);
}
h2 {
  margin: 0;
  font:
    600 29px/1.2 'STSong',
    'SimSun',
    serif;
}
.card > p {
  color: var(--muted);
}
.form {
  display: grid;
  gap: 15px;
  margin-top: 25px;
}
.form label {
  display: grid;
  gap: 7px;
  font-size: 12px;
  font-weight: 700;
}
.input {
  width: 100%;
  height: 42px;
  padding: 0 11px;
  border: 1px solid #cbd6e4;
  border-radius: 7px;
  outline-color: var(--orange);
}
.button {
  height: 43px;
  border: 0;
  color: #fff;
  background: var(--orange);
  border-radius: 7px;
  font-weight: 800;
  cursor: pointer;
}
.error {
  min-height: 21px;
  margin: 10px 0 0;
  color: var(--red);
  font-size: 12px;
}
.demo {
  margin-top: 17px;
  padding: 12px 13px;
  color: #53627b;
  background: #f8f0e7;
  border-left: 3px solid var(--orange);
  font-size: 12px;
  line-height: 1.8;
}
.back {
  margin-top: 17px;
  text-align: center;
  color: #60708a;
  text-decoration: none;
}
@media (max-width: 850px) {
  body {
    background: var(--paper);
  }
  .shell {
    grid-template-columns: 1fr;
  }
  .intro {
    min-height: 350px;
    padding: 55px 9vw;
    background: var(--navy);
  }
  .login {
    padding: 45px 8vw;
  }
}
@media (max-width: 520px) {
  .login {
    padding: 25px 15px;
  }
  .card {
    padding: 23px;
  }
}