:root {
  --page-bg: #f3f5f7;
  --surface: #ffffff;
  --border: #d9dee5;
  --border-strong: #aeb7c2;
  --text: #20252b;
  --muted: #66717e;
  --primary: #1769aa;
  --primary-hover: #11578f;
  --danger: #b4232f;
  --danger-soft: #fff1f2;
  --focus: rgba(23, 105, 170, 0.2);
  --radius: 8px;
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-width: 320px;
  min-height: 100%;
  margin: 0;
}

body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  color: var(--text);
  background: var(--page-bg);
  font-size: 14px;
  line-height: 1.5;
}

.login-shell {
  width: min(100%, 420px);
}

.login-panel {
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 10px 28px rgba(30, 38, 46, 0.08);
}

.product-name {
  margin: 0 0 6px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
}

h1 {
  margin: 0 0 24px;
  font-size: 24px;
  line-height: 1.25;
}

.field {
  display: grid;
  gap: 6px;
}

.field > span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

input {
  width: 100%;
  min-height: 44px;
  padding: 9px 11px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  color: var(--text);
  background: var(--surface);
  font: inherit;
}

input:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 1px;
}

.login-error {
  margin: 12px 0 0;
  padding: 9px 11px;
  border: 1px solid #efb6bc;
  border-radius: 6px;
  color: var(--danger);
  background: var(--danger-soft);
}

.login-button {
  width: 100%;
  min-height: 44px;
  margin-top: 20px;
  padding: 9px 15px;
  border: 1px solid var(--primary);
  border-radius: 6px;
  color: #ffffff;
  background: var(--primary);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.login-button:hover:not(:disabled) {
  border-color: var(--primary-hover);
  background: var(--primary-hover);
}

.login-button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

[hidden] {
  display: none !important;
}

@media (max-width: 500px) {
  body {
    padding: 16px;
  }

  .login-panel {
    padding: 24px 20px;
  }
}