:root {
  --bg: #f4f7f6;
  --ink: #1f2a2b;
  --muted: #687679;
  --line: #dce5e4;
  --brand: #176b5b;
  --brand-dark: #0f5145;
  --gold: #f3c86b;
  --danger: #b42318;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(23, 107, 91, 0.1), rgba(184, 92, 56, 0.08)),
    var(--bg);
}

.login-shell {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(420px, 100%);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(24, 50, 53, 0.16);
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 22px 24px;
  background: #183235;
  color: #fff;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 8px;
  background: var(--gold);
  color: #183235;
  font-weight: 800;
}

.brand-row strong,
.brand-row span {
  display: block;
}

.brand-row span {
  margin-top: 4px;
  color: #b9c9c8;
  font-size: 12px;
}

.login-form {
  display: grid;
  gap: 16px;
  padding: 26px 24px 24px;
}

h1 {
  margin: 0 0 4px;
  font-size: 28px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 11px;
  color: var(--ink);
  font: inherit;
  outline: none;
}

input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(23, 107, 91, 0.13);
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

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

button:disabled {
  cursor: wait;
  opacity: 0.74;
}

#loginMessage {
  min-height: 20px;
  margin: 0;
  color: var(--danger);
  font-size: 13px;
}