:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1f2933;
  --muted: #6b7280;
  --primary: #1a73e8;
  --border: #d7dee8;
  --err-bg: #fdecea; --err-fg: #b3261e;
  --ok-bg: #e6f4ea; --ok-fg: #1e7e34;
  --info-bg: #e8f0fe; --info-fg: #174ea6;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 24px;
}

.card {
  background: var(--card);
  width: 100%;
  max-width: 420px;
  margin-top: 8vh;
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 6px 24px rgba(20, 30, 50, 0.06);
}

h1 { font-size: 1.35rem; margin: 0 0 16px; }
.lead { color: var(--text); margin: 0 0 20px; }
.hint { color: var(--muted); font-size: 0.85rem; margin-top: 18px; }

label { display: block; font-weight: 600; font-size: 0.9rem; margin: 14px 0 6px; }

input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}
input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,115,232,0.15); }

button {
  width: 100%;
  margin-top: 20px;
  padding: 12px 16px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
button:hover { background: #1663c7; }

.alert { padding: 12px 14px; border-radius: 8px; font-size: 0.92rem; margin-bottom: 12px; }
.alert.error { background: var(--err-bg); color: var(--err-fg); }
.alert.success { background: var(--ok-bg); color: var(--ok-fg); }
.alert.info { background: var(--info-bg); color: var(--info-fg); }

a { color: var(--primary); }

.foot { color: var(--muted); font-size: 0.78rem; margin-top: 24px; }