body { font-family:'Segoe UI',sans-serif; background-color: #343a40; display: flex; align-items: center; justify-content: center; height: 100vh; margin: 0; }
.login-box { background: white; border-radius: 10px; box-shadow: 0 10px 25px rgba(0,0,0,0.5); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px 30px; width: 90%; max-width: 400px; box-sizing: border-box; }
.login-box i { font-size: 50px; color: #343a40; margin-bottom: 20px; }
.login-box h2 { margin: 0; color: #333; font-size: 24px; }
.login-box p { color: #666; font-size: 14px; margin: 10px 0 20px 0; }
.login-box input { text-align: center; letter-spacing: 2px; font-size: 20px; padding: 15px; border: 2px solid #ddd; border-radius: 8px; width: 100%; box-sizing: border-box; outline: none; transition: 0.3s; margin-bottom: 20px; }
.login-box input:focus { border-color: #0d6efd; }
.login-btn { width: 100%; padding: 15px; background: #0d6efd; color: white; border: none; border-radius: 8px; font-weight: 700; font-size: 16px; cursor: pointer; transition: 0.2s; }
.login-btn:hover { background: #0b5ed7; }