:root {
  --bg: #edf2f5;
  --ink: #27323d;
  --muted: #7b8794;
  --line: #e1e6eb;
  --panel: #ffffff;
  --accent: #20a53a;
  --accent-dark: #16832c;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
}

.login-shell {
  width: min(920px, calc(100vw - 32px));
  min-height: 520px;
  display: grid;
  grid-template-columns: 420px 1fr;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 18px 50px rgba(26, 38, 50, 0.12);
}

.login-card {
  padding: 44px;
}

.logo-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 44px;
}

.logo {
  display: grid;
  place-items: center;
  width: 46px;
  height: 36px;
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

small,
p {
  color: var(--muted);
}

small {
  display: block;
  margin-top: 4px;
}

h1 {
  margin: 0 0 28px;
  font-size: 24px;
  font-weight: 500;
}

form {
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 7px;
  font-size: 14px;
}

input {
  width: 100%;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 12px;
  font: inherit;
}

input:focus {
  outline: 1px solid var(--accent);
  border-color: var(--accent);
}

button {
  height: 42px;
  border: 0;
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font: inherit;
}

button:hover {
  background: var(--accent-dark);
}

#message {
  min-height: 20px;
  margin: 0;
  color: #c62828;
}

.side-panel {
  padding: 52px 44px;
  background: #202b36;
  color: #fff;
}

.side-panel h2 {
  margin: 0 0 14px;
  font-size: 28px;
  font-weight: 500;
}

.side-panel p {
  margin: 0 0 28px;
  line-height: 1.8;
  color: #b9c5d1;
}

.checks {
  display: grid;
  gap: 12px;
}

.checks span {
  padding: 12px 14px;
  border-radius: 4px;
  background: #2d3a46;
  color: #dce6ef;
}

@media (max-width: 760px) {
  .login-shell {
    grid-template-columns: 1fr;
  }

  .side-panel {
    display: none;
  }

  .login-card {
    padding: 32px 24px;
  }
}