:root {
  --bg: #eef1f4;
  --card-bg: #ffffff;
  --topbar-bg: #22303f;
  --accent: #3a7bd5;
  --text: #2a333d;
  --muted: #7c8a97;
  --border: #dde3e8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
}

.topbar {
  background: var(--topbar-bg);
  color: #fff;
  padding: 14px 24px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
}

.brand { font-weight: 600; letter-spacing: 0.5px; }
.brand-accent { color: #5fd68a; }
.model { color: #9fb0c0; font-size: 13px; }

.login-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
}

.login-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 24px rgba(20, 30, 40, 0.08);
  padding: 32px 36px 28px;
  width: 100%;
  max-width: 340px;
  text-align: center;
}

.device-icon { margin-bottom: 8px; }

h1 { font-size: 20px; margin: 4px 0 4px; }
.subtitle { color: var(--muted); font-size: 13px; margin: 0 0 20px; }
.hint { color: var(--muted); font-size: 12px; margin-top: 14px; }

form { text-align: left; }

label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin: 10px 0 4px;
}

label.checkbox {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  margin: 12px 0 0;
}

input[type="text"], input[type="password"] {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 14px;
  background: #fafbfc;
}

input[type="text"]:focus, input[type="password"]:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
}

.row-between { display: flex; justify-content: space-between; align-items: center; }

button[type="submit"] {
  width: 100%;
  margin-top: 18px;
  padding: 10px;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

button[type="submit"]:hover { background: #3169b8; }

.error-card h1 { color: #c94f4f; }

.footer {
  padding: 10px 24px;
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: var(--card-bg);
  display: flex;
  gap: 8px;
}

.footer .sep { color: var(--border); }