:root {
  color-scheme: light;
  --bg: #eef2ff;
  --panel: #ffffff;
  --ink: #1e2430;
  --muted: #68728a;
  --line: #dfe5f2;
  --accent: #4f6df5;
  --danger: #b42318;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 20% 20%, rgba(79, 109, 245, 0.17), transparent 34%),
    radial-gradient(circle at 80% 75%, rgba(6, 182, 212, 0.13), transparent 32%),
    var(--bg);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

.login-card {
  width: min(100%, 410px);
  padding: 34px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: 0 22px 65px rgba(41, 53, 98, 0.16);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  border-radius: 14px;
  color: #fff;
  background: linear-gradient(135deg, #4f6df5, #06b6d4);
  font-weight: 750;
  letter-spacing: 0.5px;
}

h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: -0.4px;
}

.subtitle {
  margin: 3px 0 24px;
  color: var(--muted);
}

.error {
  margin: 0 0 16px;
  padding: 10px 12px;
  border-radius: 9px;
  color: var(--danger);
  background: #fff1f0;
  font-size: 13px;
}

form {
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--ink);
  background: #fff;
  font: inherit;
  outline: none;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 109, 245, 0.14);
}

button {
  padding: 11px 16px;
  border: 0;
  border-radius: 9px;
  color: #fff;
  background: var(--accent);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:hover { background: #405ddd; }
button:focus-visible { outline: 3px solid rgba(79, 109, 245, 0.3); }

.security-note {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 12px;
}