:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --border: #d9e0ea;
  --text: #1f2937;
  --muted: #667085;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

button,
input {
  font: inherit;
}

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

.login-panel {
  width: min(420px, 100%);
  padding: 32px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 18px 48px rgba(15, 23, 42, 0.08);
}

.eyebrow,
.login-panel h1 {
  margin: 0;
}

.eyebrow {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.login-panel h1 {
  margin-top: 6px;
  font-size: 28px;
}

form {
  margin-top: 28px;
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

input {
  width: 100%;
  min-height: 42px;
  padding: 0 12px;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
}

input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.login-message {
  min-height: 20px;
  margin: 0;
  color: var(--danger);
  font-size: 14px;
}

button {
  min-height: 42px;
  color: #fff;
  background: var(--primary);
  border: 1px solid var(--primary);
  border-radius: 6px;
  cursor: pointer;
}

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

button:disabled {
  cursor: not-allowed;
  opacity: 0.68;
}

.back-link {
  margin-top: 18px;
  display: inline-flex;
  color: var(--primary);
  font-size: 14px;
  text-decoration: none;
}