* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, sans-serif; background: #f0f2f5; display: flex; justify-content: center; align-items: center; min-height: 100vh; }
.login-box { background: #fff; padding: 2rem; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,.1); width: 100%; max-width: 360px; }
h1 { margin-bottom: 1.5rem; font-size: 1.5rem; text-align: center; color: #333; }
input { display: block; width: 100%; padding: .75rem; margin-bottom: 1rem; border: 1px solid #ddd; border-radius: 4px; font-size: 1rem; }
button { display: block; width: 100%; padding: .75rem; background: #4a90d9; color: #fff; border: none; border-radius: 4px; font-size: 1rem; cursor: pointer; }
button:hover { background: #357abd; }
.error { background: #fee; color: #c33; padding: .75rem; border-radius: 4px; margin-bottom: 1rem; text-align: center; }
.switch-link { margin-top: 1rem; text-align: center; font-size: .875rem; color: #666; }
.switch-link a { color: #4a90d9; text-decoration: none; }
.switch-link a:hover { text-decoration: underline; }