:root {
  --bg-start: #eef4ff;
  --bg-end: #f8fafc;
  --card: #ffffff;
  --border: #dbe3f0;
  --text: #1f2937;
  --muted: #64748b;
  --primary: #2563eb;
  --danger: #dc2626;
  --success: #059669;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Plus Jakarta Sans", "Segoe UI", system-ui, sans-serif;
  background:
    radial-gradient(1200px 600px at 50% -20%, #dbeafe 0%, rgba(219, 234, 254, 0) 60%),
    linear-gradient(180deg, var(--bg-start), var(--bg-end));
  color: var(--text);
  min-height: 100vh;
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}

.auth-card {
  width: min(420px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.12);
  padding: 26px 22px;
}

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

.subtitle {
  margin: 8px 0 18px;
  color: var(--muted);
  font-size: 14px;
}

.auth-form {
  display: grid;
  gap: 10px;
}

label {
  font-size: 14px;
  color: var(--muted);
}

input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 12px;
  font-size: 14px;
}

input:focus {
  outline: 2px solid rgba(37, 99, 235, 0.2);
  border-color: var(--primary);
}

button {
  border: 0;
  border-radius: 10px;
  padding: 11px 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

button.primary {
  margin-top: 8px;
  color: #fff;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
}

button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.message {
  min-height: 24px;
  margin: 12px 0 10px;
  font-size: 14px;
  color: var(--muted);
}

.message.error {
  color: var(--danger);
}

.message.success {
  color: var(--success);
}

.link {
  display: inline-block;
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

.link:hover {
  text-decoration: underline;
}