:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #0ea5e9;
  --accent-hover: #0284c7;
  --border: #dbe4ef;
  --error-bg: #fee2e2;
  --error-text: #991b1b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, sans-serif;
  background: radial-gradient(circle at top, #e9f3ff 0%, var(--bg) 45%, #eef2ff 100%);
  color: var(--text);
}

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

.auth-card {
  width: min(100%, 420px);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 24px 48px rgba(15, 23, 42, 0.14);
  padding: 28px;
}

h1 { margin: 0 0 6px; font-size: 1.45rem; }
.subtitle { margin: 0 0 18px; color: var(--muted); }

.auth-card form { margin-top: 4px; }
label { display: block; margin: 10px 0 6px; font-weight: 700; font-size: .92rem; }
input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px;
  font-size: .95rem;
}

input:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 45%, white);
  border-color: var(--accent);
}

button {
  width: 100%;
  margin-top: 14px;
  border: 0;
  border-radius: 10px;
  padding: 11px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

button:hover { background: var(--accent-hover); }

.auth-error {
  background: var(--error-bg);
  color: var(--error-text);
  border-radius: 10px;
  padding: 10px 12px;
  margin-bottom: 12px;
  font-size: .92rem;
}

.security-note {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: .85rem;
}