:root {
  color-scheme: light;
  --bg: #f8fafc;
  --surface: rgba(255, 255, 255, 0.92);
  --text: #0f172a;
  --muted: #64748b;
  --line: rgba(148, 163, 184, 0.35);
  --primary: #0b1220;
  --shadow: 0 24px 64px -36px rgba(15, 23, 42, 0.55);
  --radius: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(135deg, #eef2ff 0%, #f8fafc 50%, #ecfeff 100%);
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 16px;
}

.login-shell {
  width: min(440px, 100%);
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 22px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  display: grid;
  gap: 12px;
}

.eyebrow {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}

h1 { margin: 6px 0 4px; }

.muted { color: var(--muted); }
.small { font-size: 12px; }

.alert {
  background: rgba(244, 63, 94, 0.1);
  color: #9f1239;
  border: 1px solid rgba(244, 63, 94, 0.2);
  padding: 10px;
  border-radius: 12px;
  font-size: 14px;
}

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

.label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.input {
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  font: inherit;
  background: #fff;
}

.btn {
  border: none;
  padding: 12px 14px;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.btn.primary {
  background: linear-gradient(135deg, #0f172a, #1f2937);
  color: white;
  box-shadow: 0 12px 28px -20px rgba(15, 23, 42, 0.7);
}

.btn:hover { transform: translateY(-1px); }

.demo {
  background: #f8fafc;
  border: 1px dashed var(--line);
  border-radius: 12px;
  padding: 10px;
}

.demo ul {
  margin: 8px 0 0;
  padding-left: 16px;
  color: var(--muted);
  font-size: 13px;
}